ADOPTS WITH AMENDMENTS:

International Mechanical Code 2012 (IMC 2012)

Heads up: There are no amended sections in this chapter.

Appendix C Fuel Gas

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Section C101 General

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C101.2 Scope

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This appendix shall apply to the installation of fuel-gas piping systems, fuel gas appliances, gaseous hydrogen systems and related accessories in accordance with Sections C101.2.1 through C101.2.5.

Exception: Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the Residential Code.

C101.2.1 Gaseous Hydrogen Systems

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Gaseous hydrogen systems shall be regulated by Section C701.

C101.2.2 Piping Systems

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These regulations cover piping systems for natural gas with an operating pressure of 125 pounds per square inch gauge (psig) (862 kPa gauge) or less, and for LP-gas with an operating pressure of 20 psig (1C40 kPa gauge) or less, except as provided in Section C402.6. Coverage shall extend from the point of delivery to the outlet of the appliance shutoff valves. Piping system requirements shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance.

C101.2.3 Gas Appliances

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Requirements for gas appliances and related accessories shall include installation, combustion and ventilation air and venting and connections to piping systems.

C101.2.4 Systems, Appliances and Equipment Outside the Scope

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This section has been amended at the state or city level.
This code shall not apply to the following:
  1. Portable fuel-gas appliances and equipment of all types that is not connected to a fixed fuel piping system.
  2. Raw material (feedstock) applications except for piping to special atmosphere generators.
  3. Oxygen-fuel gas cutting and welding systems.
  4. Industrial gas applications using gases such as acetylene and acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen and nitrogen.
  5. Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms and natural gas processing plants.
  6. Integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by, or used in, chemical reactions.
  7. LP-gas installations at utility gas plants.
  8. Liquefied natural gas (LNG) installations.
  9. Proprietary items of equipment, apparatus or instruments such as gas-generating sets, compressors and calorimeters.
  10. LP-gas equipment for vaporization, gas mixing and gas manufacturing.
  11. Temporary fuel-gas piping for buildings under construction or renovation that is not to become part of the permanent piping system.
  12. Installation of LP-gas systems for railroad switch heating.
  13. Installation of hydrogen gas, LP-gas and compressed natural gas (CNG) systems on vehicles.
  14. Except as provided in Section C401.1.1, gas piping, meters, gas pressure regulators and other appurtenances used by the serving gas supplier in the distribution of gas, other than undiluted LPgas.
  15. Building design and construction, except as specified herein.
  16. Piping systems for mixtures of gas and air within the flammable range with an operating pressure greater than 10 psig (69 kPa gauge).
  17. Portable fuel cell appliances that are neither connected to a fixed piping system nor interconnected to a power grid.

C101.3 Intent

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The purpose of this code is to provide minimum standards to safeguard life or limb, health, property and public welfare by regulating and controlling the design, construction, installation, quality of materials, and location of fuel gas systems.

C101.4 Severability

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If a section, subsection, sentence, clause or phrase of this code is, for any reason, held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this code.

Section C102 Inspections and Testing

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C102.1 General

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The code official is authorized to conduct such inspections as are deemed necessary to determine compliance with the provisions of this code. Construction or work for which a permit is required shall be subject to inspection by the code official, and such construction or work shall remain accessible and exposed for inspection purposes until approved. Approval as a result of an inspection shall not be construed to be an approval of a violation of the provisions of this code or of other ordinances of the jurisdiction. Inspections presuming to give authority to violate or cancel the provisions of this code or of other ordinances of the jurisdiction shall not be valid.

C102.2 Required Inspections and Testing

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The code official, upon notification from the permit holder or the permit holder's agent, shall make the following inspections and other such inspections as necessary, and shall either release that portion of the construction or notify the permit holder or the permit holder's agent of violations that are required to be corrected. The holder of the permit shall be responsible for scheduling such inspections.
  1. Underground inspection shall be made after trenches or ditches are excavated and bedded, piping is installed and before backfill is put in place. When excavated soil contains rocks, broken concrete, frozen chunks and other rubble that would damage or break the piping or cause corrosive action, clean backfill shall be on the job site.
  2. Rough-in inspection shall be made after the roof, framing, fireblocking and bracing are in place and components to be concealed are complete, and prior to the installation of wall or ceiling membranes.
  3. Final inspection shall be made upon completion of the installation.
     The requirements of this section shall not be considered to prohibit the operation of any heating appliance installed to replace existing heating appliance serving an occupied portion of a structure in the event a request for inspection of such heating appliance has been filed with the department not more than 48 hours after replacement work is completed, and before any portion of such appliance is concealed by any permanent portion of the structure.

C102.3 Testing

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Installations shall be tested as required in this code and in accordance with Sections C102.3.1 through C102.3.3. Tests shall be made by the permit holder and observed by the code official.

C102.3.1 New, Altered, Extended or Repaired Installations

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New installations and parts of existing installations, which have been altered, extended, renovated or repaired, shall be tested as prescribed herein to disclose leaks and defects.

C102.3.2 Apparatus, Instruments, Material and Labor for Tests

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Apparatus, instruments, material and labor required for testing an installation or part thereof shall be furnished by the permit holder.

C102.3.3 Reinspection and Testing

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Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.

C102.4 Approval

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After the prescribed tests and inspections indicate that the work complies in all respects with this appendix, a notice of approval shall be issued by the code official.

C102.4.1 Revocation

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The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the notice is issued in error, or on the basis of incorrect information supplied or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.

C102.5 Temporary Connection

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The code official shall have the authority to allow the temporary connection of an installation to the sources of energy for the purpose of testing the installation or for use under a temporary certificate of occupancy.

C102.6 Connection of Service Utilities

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A person shall not make connections from a utility, source of energy, fuel or power to any building or system that is regulated by this code for which a permit is required until authorized by the code official.

Section C103 Temporary Equipment, Systems and Uses

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C103.1 General

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The code official is authorized to issue a permit for temporary equipment, systems and uses. Such permits shall be limited as to time of service, but shall not be permitted for more than 180 days. The code official is authorized to grant extensions for demonstrated cause.

C103.2 Conformance

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Temporary equipment, systems and uses shall conform to the structural strength, fire safety, means of egress, accessibility, light, ventilation and sanitary requirements of this code as necessary to ensure the public health, safety and general welfare.

C103.3 Temporary Utilities

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The code official is authorized to give permission to temporarily supply utilities before an installation has been fully completed and the final certificate of completion has been issued. The part covered by the temporary certificate shall comply with the requirements specified for temporary lighting, heat or power in the code.

C103.4 Termination of Approval

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The code official is authorized to terminate such permit for a temporary structure or use and to order the temporary structure or use to be discontinued.

Section C201 General

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C201.1 Scope

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Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter.

C201.2 Interchangeability

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Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

C201.3 Terms Defined in Other Codes

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This section has been amended at the state or city level.
Where terms are not defined in this code and are defined in the Building Code, Electrical Code or Plumbing Code, such terms shall have meanings ascribed to them as in those codes.

C201.4 Terms Not Defined

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This section has been amended at the state or city level.
Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies.

     Words of common usage are given their plain, natural and ordinary meanings. Words that have well-defined legal meanings are given those meanings.

Section C202 General Definitions

AMENDMENT
This section has been amended at the state or city level.
ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also "Ready access").

AIR CONDITIONER, GAS-FIRED. A gas-burning, automatically operated appliance for supplying cooled and/or dehumidified air or chilled liquid.

AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the requirements of a conditioned space.

AIR-HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area.

AIR, MAKEUP. Air that is provided to replace air being exhausted.

ANODELESS RISER. A transition assembly in which plastic piping is installed and terminated above ground outside of a building.

APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic burner ignition and safety shutoff device and other automatic devices which accomplish complete turn-on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas.

APPLIANCE, FAN-ASSISTED COMBUSTION. An appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber or heat exchanger.

APPLIANCE TYPE.

Low-heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000°F (538°C) or less.

Medium-heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000°F (538°C), but not greater than 2,000°F (1093°C).

APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outside atmosphere.

APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products of combustion are conveyed directly from the appliance to the outside atmosphere through an approved chimney or vent system.

ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of the earth, approximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level.

AUTOMATIC IGNITION. Ignition of gas at the burner(s) when the gas controlling device is turned on, including reignition if the flames on the burner(s) have been extinguished by means other than by the closing of the gas controlling device.

BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air-gas mixtures or flue gases.

BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double-acting barometric draft regulator is one whose balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft.

BONDING JUMPER. A conductor installed to electrically connect metallic gas piping to the grounding electrode system.

BRAZING. A metal-joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F (538°C), but lower than that of the base metal being joined. The filler material is distributed between the closely fitted surfaces of the joint by capillary action.

BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters.

BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F (0.56°C) (1 Btu = 1055 J).

BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.

Induced-draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner.

Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with this added pressure being applied at the burner.

[M] CHIMNEY. A primarily vertical structure containing one or more flues, for the purpose of carrying gaseous products of combustion and air from an appliance to the outside atmosphere.

Factory-built chimney. A listed and labeled chimney composed of factory-made components, assembled in the field in accordance with manufacturer's instructions and the conditions of the listing.

Masonry chimney. A field-constructed chimney composed of solid masonry units, bricks, stones or concrete.

Metal chimney. A field-constructed chimney of metal.

[M] CLEARANCE. The minimum distance through air measured between the heat-producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly.

[M] COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light.

COMBUSTION AIR. Air necessary for complete combustion of a fuel, including theoretical air and excess air.

[M] COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs.

COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air.

CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finish surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed.

CONCEALED PIPING. Piping that is located in a concealed location (see "Concealed location").

CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure.

CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings, semirigid metallic tubing and fittings or a listed and labeled device that connects an appliance to the gas piping system.

CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent.

CONTROL. A manual or automatic device designed to regulate the gas, air, water or electrical supply to, or operation of, a mechanical system.

CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally utilizing another fuel.

COUNTER APPLIANCES. Appliances such as coffee brewers and coffee urns and any appurtenant water-heating appliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter.

CUBIC FOOT. The amount of gas that occupies 1 cubic foot (0.02832 m3) when at a temperature of 60°F (16°C), saturated with water vapor and under a pressure equivalent to that of C30 inches of mercury (101 kPa).

DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases.

DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames.

DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance designed for installation within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames.

DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour, or Btu/h (1 Btu/h = 0.2931 W).

DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases.

DIRECT-VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outside atmosphere and all flue gases are discharged directly to the outside atmosphere.

DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion through the gas passages of the appliance to the atmosphere.

Mechanical or induced draft. The pressure difference created by the action of a fan, blower or ejector that is located between the appliance and the chimney or vent termination.

Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere.

DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appliance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, back-draft or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance.

DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value.

DRIP. The container placed at a low point in a system of piping to collect condensate and from which the condensate is removable.

DRY GAS. A gas having a moisture and hydrocarbon dew point below any normal temperature to which the gas piping is exposed.

DUCT FURNACE. A warm-air furnace normally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm-air heating appliance that depends for air circulation on a blower not furnished as part of the furnace.

[M] DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment.

EQUIPMENT. Apparatus and devices other than appliances.

EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line.

FIRING VALVE. A valve of the plug and barrel type designed for use with gas, and equipped with a lever handle for manual operation and a dial to indicate the percentage of opening.

FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of ignition of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners.

FLOOR FURNACE. A completely self-contained furnace suspended from the floor of the space being heated, taking air for combustion from outside such space and with means for observing flames and lighting the appliance from such space.

Fan type. A floor furnace equipped with a fan which provides the primary means for circulating air.

Gravity type. A floor furnace depending primarily upon circulation of air by gravity. This classification shall also include floor furnaces equipped with booster-type fans which do not materially restrict free circulation of air by gravity flow when such fans are not in operation.

FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood.

FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system.

FLUE GASES. Products of combustion plus excess air in appliance flues or heat exchangers.

FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding structure from the effects of combustion products and for conveying combustion products without leakage to the atmosphere.

FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases.

[M] FURNACE. A completely self-contained heating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location.

FURNACE, CENTRAL. A self-contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location.

Downflow furnace. A furnace designed with airflow discharge vertically downward at or near the bottom of the furnace.

Forced air furnace with cooling unit. A single-package unit, consisting of a gas-fired forced-air furnace of one of the types listed below combined with an electrically or fuel gas-powered summer air-conditioning system, contained in a common casing.

Forced-air type. A central furnace equipped with a fan or blower which provides the primary means for circulation of air.

Gravity furnace with booster fan. A furnace equipped with a booster fan that does not materially restrict free circulation of air by gravity flow when the fan is not in operation.

Gravity type. A central furnace depending primarily on circulation of air by gravity.

Horizontal forced-air type. A furnace with airflow through the appliance essentially in a horizontal path.

Multiple-position furnace. A furnace designed so that it can be installed with the airflow discharge in the upflow, horizontal or downflow direction.

Upflow furnace. A furnace designed with airflow discharge vertically upward at or near the top of the furnace. This classification includes "highboy" furnaces with the blower mounted below the heating element and "lowboy" furnaces with the blower mounted beside the heating element.

FURNACE, ENCLOSED. A specific heating, or heating and ventilating, furnace incorporating an integral total enclosure and using only outside air for combustion.

FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and which forms part of an air distribution system.

GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and disconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the closed position.

GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas.

[F] GASEOUS HYDROGEN SYSTEM. See Section 702.1.

[M] HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the building code as a highhazard group classification.

HOUSE PIPING. See "Piping system."

[F] HYDROGEN CUT-OFF ROOM. See Section 702.1.

HYDROGEN GENERATING APPLIANCE. See Section 702.1.

IGNITION PILOT. A pilot that operates during the lighting cycle and discontinues during main burner operation.

[M] IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors and electrical switching devices.

INCINERATOR. An appliance used to reduce combustible refuse material to ashes and which is manufactured, sold and installed as a complete unit.

INDUSTRIAL AIR HEATERS, DIRECT-FIRED NONRECIRCULATING. A heater in which all the products of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air.

INDUSTRIAL AIR HEATERS, DIRECT-FIRED RECIRCULATING. A heater in which all the products of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air.

INFRARED RADIANT HEATER. A heater that directs a substantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type.

JOINT, FLANGED. A joint made by bolting together a pair of flanged ends.

JOINT, FLARED. A metal-to-metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare.

JOINT, MECHANICAL. A general form of gas-tight joints obtained by the joining of metal parts through a positiveholding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint.

JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance which forms a continuous bond between the mating surfaces without dissolving either one of them.

JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion of the materials when the parts are pressed together.

JOINT, WELDED. A gas-tight joint obtained by the joining of metal parts in molten state.

[A] LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, inspection agency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.

LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak.

LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance.

LIQUEFIED PETROLEUM GAS or LPG (LP-GAS). Liquefied petroleum gas composed predominately of propane, propylene, butanes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures.

[A] LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.

LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel-burning fireplace.

LUBRICATED PLUG-TYPE VALVE. A valve of the plug and barrel type provided with means for maintaining a lubricant between the bearing surfaces.

MAIN BURNER. A device or group of devices essentially forming an integral unit for the final conveyance of gas or a mixture of gas and air to the combustion zone, and on which combustion takes place to accomplish the function for which the appliance is designed.

METER. The instrument installed to measure the volume of gas delivered through it.

MODULATING. Modulating or throttling is the action of a control from its maximum to minimum position in either predetermined steps or increments of movement as caused by its actuating medium.

[M] NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria:
  1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54°F (C30°C) above the furnace temperature at the beginning of the test.
  2. There shall not be flaming from the specimen after the first C30 seconds.
  3. If the weight loss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flaming of the specimen.
OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section.

ORIFICE. The opening in a cap, spud or other device whereby the flow of gas is limited and through which the gas is discharged to the burner.

OUTLET. The point at which a gas-fired appliance connects to the gas piping system.

OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the gas supply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level.

PILOT. A small flame that is utilized to ignite the gas at the main burner or burners.

PIPING. Where used in this code, "piping" refers to either pipe or tubing, or both.

Pipe. A rigid conduit of iron, steel, copper, brass or plastic.

Tubing. Semirigid conduit of copper, aluminum, plastic or steel.

PIPING SYSTEM. All fuel piping, valves and fittings from the outlet of the point of delivery to the outlets of the appliance shutoff valves.

PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature.

PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a grid-isolated load and has an integral fuel supply.

PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burners.

PRESSURE TEST. An operation performed to verify the gas-tight integrity of gas piping following its installation or modification.

PURGE. To free a gas conduit of air or gas, or a mixture of gas and air.

QUICK-DISCONNECT DEVICE. A hand-operated device that provides a means for connecting and disconnecting an appliance or an appliance connector to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected.

[M] READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see "Access").

[A] REGISTERED DESIGN PROFESSIONAL. An individual who is registered or licensed to practice their respective design profession as defined by the statutory requirements of the professional registration laws of the state or jurisdiction in which the project is to be constructed.

REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds-to-inches water column (MP regulator) or inches-to-inches water column (appliance regulator).

REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows:

Adjustable.
  1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjustable over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range.
  2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjustable. The adjustment means shall be concealed.
Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settings. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings.

Nonadjustable.
  1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable.
  2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combination of weights.
REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device.

REGULATOR, MEDIUM-PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure.

REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device.

REGULATOR, SERVICE PRESSURE. For natural gas systems, a device installed by the serving gas supplier to reduce and limit the service line pressure to delivery pressure. For undiluted liquefied petroleum gas systems, the regulator located upstream from all line gas pressure regulators, where installed, and downstream from any first stage or a high pressure regulator in the system.

RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood in the event of a strong chimney updraft.

RISER, GAS. A vertical pipe supplying fuel gas.

ROOM HEATER, UNVENTED. See "Unvented room heater."

ROOM HEATER, VENTED. A free-standing heating unit used for direct heating of the space in and adjacent to that in which the unit is located (see also "Vented room heater").

SAFETY SHUTOFF DEVICE. See "Flame safeguard."

[B] SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof.

SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition.

STATIONARY FUEL CELL POWER PLANT. A self-contained package or factory-matched packages which constitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable thermal energy that is permanently connected and fixed in place.

THERMOSTAT.

Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures.

Integral gas valve type. An automatic device, actuated by temperature changes, designed to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device.
  1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change.
  2. Snap-acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vice versa.
TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure-tight connection between two materials which cannot be joined directly one to another.

UNIT HEATER.

High-static pressure type. A self-contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H2O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct.

Low-static pressure type. A self-contained, automatically controlled, vented appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer's specifications.

UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliances provide radiant heat or convection heat by gravity or fan circulation directly from the heater and do not utilize ducts.

VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance.

Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement.

Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operation of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means.

Automatic gas shutoff. A valve used in conjunction with an automatic gas shutoff device to shut off the gas supply to a water-heating system. It shall be constructed integrally with the gas shutoff device or shall be a separate assembly.

Individual main burner. A valve that controls the gas supply to an individual main burner.

Main burner control. A valve that controls the gas supply to the main burner manifold.

Manual main gas-control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff.

Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe conditions occur. The device remains closed until manually reopened.

Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer piping system, to shut off the entire piping system.

VENT. A pipe or other conduit composed of factory-made components, containing a passageway for conveying combustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance.

Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances.

Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents.

Type BW vent. A vent listed and labeled for use with wall furnaces.

Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents.

VENT CONNECTOR. See "Connector."

VENT GASES. Products of combustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator.

VENT PIPING.

Breather. Piping run from a pressure-regulating device to the outdoors, designed to provide a reference to atmospheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent.

Relief. Piping run from a pressure-regulating or pressure-limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system.

VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are classified into the following four categories:

Category I. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent.

Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent.

Category III. An appliance that operates with a positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent.

Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent.

VENTED ROOM HEATER. A vented self-contained, freestanding, nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections.

VENTED WALL FURNACE. A self-contained vented appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated through openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined.

VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outside atmosphere for the purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway.

Forced-draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under positive static vent pressure.

Induced draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under nonpositive static vent pressure.

Mechanical draft venting system. A venting system designed to remove flue or vent gases by mechanical means, that consists of an induced draft portion under nonpositive static pressure or a forced draft portion under positive static pressure.

Natural draft venting system. A venting system designed to remove flue or vent gases under nonpositive static vent pressure entirely by natural draft.

WALL HEATER, UNVENTED-TYPE. A room heater of the type designed for insertion in or attachment to a wall or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated.

Section C301 General

AMENDMENT
This section has been amended at the state or city level.

C301.1 Scope

AMENDMENT
This section has been amended at the state or city level.
This chapter shall govern the approval and installation of all equipment and appliances that comprise parts of the installations regulated by this code in accordance with Section C101.2.

C301.1.1 Other Fuels

AMENDMENT
This section has been amended at the state or city level.
The requirements for combustion and dilution air for gas-fired appliances shall be governed by Section C304. The requirements for combustion and dilution air for appliances operating with fuels other than fuel gas shall be regulated by Chapter 7.

C301.2 Energy Utilization

AMENDMENT
This section has been amended at the state or city level.
Heating, ventilating and air-conditioning systems of all structures shall be designed and installed for efficient utilization of energy in accordance with the Energy Code.

C301.3 Listed and Labeled

AMENDMENT
This section has been amended at the state or city level.
Appliances regulated by this code shall be listed and labeled for the application in which they are used unless otherwise approved in accordance with Section C105. The approval of unlisted appliances in accordance with Section C105 shall be based upon approved engineering evaluation.

C301.4 Fuel Types

AMENDMENT
This section has been amended at the state or city level.
Appliances shall be designed for use with the type of fuel gas that will be supplied to them.

C301.4.1 Appliance Fuel Conversion

AMENDMENT
This section has been amended at the state or city level.
Appliances shall not be converted to utilize a different fuel gas except where complete instructions for such conversion are provided in the installation instructions, by the serving gas supplier or by the appliance manufacturer.

C301.11 Flood Hazard

AMENDMENT
This section has been amended at the state or city level.
For structures located in flood hazard areas, the appliance, equipment and system installations regulated by this code shall be located at or above the elevation established by the Flood Plain Administrator for utilities and attendant equipment.

Exception: The appliance, equipment and system installations regulated by this code are permitted to be located below the elevation established by the Flood Plain Administrator for utilities and attendant equipment provided that they are designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of flooding to such elevation.

Section C302 Structural Safety

AMENDMENT
This section has been amended at the state or city level.

C302.1 Structural Safety

AMENDMENT
This section has been amended at the state or city level.

Section C303 Appliance Location

AMENDMENT
This section has been amended at the state or city level.

C303.1 General

AMENDMENT
This section has been amended at the state or city level.
Appliances shall be located as required by this section, specific requirements elsewhere in this appendix and the conditions of the equipment and appliance listing.

FIGURE C303.1
ILLUSTRATIONS OF NORMAL VEHICLE PATH AND RECOMMEND TYPES OF PROTECTION

C303.2 Hazardous Locations

AMENDMENT
This section has been amended at the state or city level.
Appliances shall not be located in a hazardous location unless listed and approved for the specific installation.

C303.3 Prohibited Locations

AMENDMENT
This section has been amended at the state or city level.
Appliances shall not be located in sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms, or in a space that opens only into such rooms or spaces, except where the installation complies with one of the following:
  1. The appliance is a direct-vent appliance installed in accordance with the conditions of the listing and the manufacturer's instructions.
  2. Vented room heaters, wall furnaces, vented decorative appliances, vented gas fireplaces, vented gas fireplace heaters and decorative appliances for installation in vented solid fuel-burning fireplaces are installed in rooms that meet the required volume criteria of Section C304.5.
  3. A single wall-mounted unvented room heater is installed in a bathroom and such unvented room heater is equipped as specified in Section C621.6 and has an input rating not greater than 6,000 Btu/h (1.76 kW). The bathroom shall meet the required volume criteria of Section C304.5.
  4. A single wall-mounted unvented room heater is installed in a bedroom and such unvented room heater is equipped as specified in Section C621.6 and has an input rating not greater than 10,000 Btu/h (2.93 kW). The bedroom shall meet the required volume criteria of Section C304.5.
  5. The appliance is installed in a room or space that opens only into a bedroom or bathroom, and such room or space is used for no other purpose and is provided with a solid weather-stripped door equipped with an approved self-closing device. All combustion air shall be taken directly from the outdoors in accordance with Section C304.6.

C303.4 Protection From Vehicle Impact Damage

AMENDMENT
This section has been amended at the state or city level.
Appliances shall not be installed in a location subject to vehicle impact damage except where protected by an approved means. See Figure C303.1.

C303.5 Indoor Locations

AMENDMENT
This section has been amended at the state or city level.
Furnaces and boilers installed in closets and alcoves shall be listed for such installation.

C303.6 Outdoor Locations

AMENDMENT
This section has been amended at the state or city level.
Appliances installed in outdoor locations shall be listed for outdoor installation.

C303.7 Pit Locations

AMENDMENT
This section has been amended at the state or city level.
Appliances installed in pits or excavations shall not come in direct contact with the surrounding soil. The sides of the pit or excavation shall be held back a minimum of 12 inches (305 mm) from the appliance. Where the depth exceeds 12 inches (305 mm) below adjoining grade, the walls of the pit or excavation shall be lined with concrete or masonry, such concrete or masonry shall extend a minimum of 4 inches (102 mm) above adjoining grade and shall have sufficient lateral load-bearing capacity to resist collapse. The appliance shall be protected from flooding in an approved manner.

Section C304 Combustion, Ventilation and Dilution Air

AMENDMENT
This section has been amended at the state or city level.

C304.1 General

AMENDMENT
This section has been amended at the state or city level.
Air for combustion, ventilation and dilution of flue gases for appliances installed in buildings shall be provided by application of one of the methods prescribed in Sections C304.5 through C304.9. Where the requirements of Section C304.5 are not met, outdoor air shall be introduced in accordance with one of the methods prescribed in Sections C304.6 through C304.9. Direct-vent appliances, gas appliances of other than natural draft design and vented gas appliances other than Category I shall be provided with combustion, ventilation and dilution air in accordance with the appliance manufacturer's instructions.

Exception: Type 1 clothes dryers that are provided with makeup air in accordance with Section C504.5.

C304.2 Appliance Location

AMENDMENT
This section has been amended at the state or city level.
Appliances shall be located so as not to interfere with proper circulation of combustion, ventilation and dilution air.

C304.3 Draft Hood/Regulator Location

AMENDMENT
This section has been amended at the state or city level.
Where used, a draft hood or a barometric draft regulator shall be installed in the same room or enclosure as the appliance served so as to prevent any difference in pressure between the hood or regulator and the combustion air supply.

C304.4 Makeup Air Provisions

AMENDMENT
This section has been amended at the state or city level.
Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with the operation of appliances, makeup air shall be provided.

C304.4.1 Special Conditions

AMENDMENT
This section has been amended at the state or city level.
In buildings containing combustion appliances, equipment or fireplaces not equipped with forced or induced draft or separated from the habitable area where an individual exhaust appliance exceeds 350 cfm (165.2 L/s), makeup air of sufficient quantity to equal that being exhausted shall be supplied to the area being ventilated. In such cases, the minimum size makeup air duct shall be 6 inches (152 mm) in diameter or equivalent in area.

C304.5 Indoor Combustion Air

AMENDMENT
This section has been amended at the state or city level.
The required volume of indoor air shall be determined in accordance with Section C304.5.1 or C304.5.2, except that where the air infiltration rate is known to be less than 0.C40 air changes per hour (ACH), Section C304.5.2 shall be used. The total required volume shall be the sum of the required volume calculated for all appliances located within the space. Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors, and through combustion air openings sized and located in accordance with Section C304.5.3, are considered to be part of the required volume.

C304.5.1 Standard Method

AMENDMENT
This section has been amended at the state or city level.
The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW) of the appliance input rating.

C304.5.2 Known Air-Infiltration-Rate Method

AMENDMENT
This section has been amended at the state or city level.
Where the air infiltration rate of a structure is known, the minimum required volume shall be determined as follows:

     For appliances other than fan-assisted, calculate volume using Equation 3-1.

(Equation 3-1)

     For fan-assisted appliances, calculate volume using Equation 3-2.

(Equation 3-2)

Iother = All appliances other than fan assisted (input in Btu/h).
Ifan = Fan-assisted appliance (input in Btu/h).
ACH = Air change per hour (percent of volume of space exchanged per hour, expressed as a decimal).


     For purposes of this calculation, an infiltration rate greater than 0.60 ACH shall not be used in Equations 3-1 and 3-2.

C304.5.3 Indoor Opening Size and Location

AMENDMENT
This section has been amended at the state or city level.
Openings used to connect indoor spaces shall be sized and located in accordance with Sections C304.5.3.1 and C304.5.3.2 (see Figure C304.5.3).

FIGURE C304.5.3
ALL AIR FROM INSIDE THE BUILDING
(see Section C304.5.3)

C304.5.3.1 Combining Spaces on the Same Story

AMENDMENT
This section has been amended at the state or city level.
Each opening shall have a minimum free area of 1 square inch per 1,000 Btu/h (2,200 mm2/kW) of the total input rating of all appliances in the space, but not less than 100 square inches (0.06 m2). One opening shall commence within 12 inches (305 mm) of the top and one opening shall commence within 12 inches (305 mm) of the bottom of the enclosure. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

C304.5.3.2 Combining Spaces in Different Stories

AMENDMENT
This section has been amended at the state or city level.
The volumes of spaces in different stories shall be considered as communicating spaces where such spaces are connected by one or more openings in doors or floors having a total minimum free area of 2 square inches per 1,000 Btu/h (4C402 mm2/kW) of total input rating of all appliances.

C304.6 Outdoor Combustion Air

AMENDMENT
This section has been amended at the state or city level.
Outdoor combustion air shall be provided through opening(s) to the outdoors in accordance with Section C304.6.1 or C304.6.2. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

C304.6.1 Two-Permanent-Openings Method

AMENDMENT
This section has been amended at the state or city level.
Two permanent openings, one commencing within 12 inches (305 mm) of the top and one commencing within 12 inches (305 mm) of the bottom of the enclosure, shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors.

     Where directly communicating with the outdoors, or where communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 Btu/h (550 mm2/kW) of total input rating of all appliances in the enclosure [see Figures C304.6.1(1) and C304.6.1(2)].

     Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of not less than 1 square inch per 2,000 Btu/h (1,100 mm2/kW) of total input rating of all appliances in the enclosure [see Figure C304.6.1(3)].

FIGURE C304.6.1(1)
ALL AIR FROM OUTDOORS—INLET AIR FROM VENTILATED
CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC
(see Section C304.6.1)


For SI: 1 foot = 304.8 mm.
FIGURE C304.6.1(2)
ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC
(see Section C304.6.1)

FIGURE C304.6.1(3)
ALL AIR FROM OUTDOORS
(see Section C304.6.1)

C304.6.2 One-Permanent-Opening Method

AMENDMENT
This section has been amended at the state or city level.
One permanent opening, commencing within 12 inches (305 mm) of the top of the enclosure, shall be provided. The appliance shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (152 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or through a vertical or horizontal duct to the outdoors, or spaces that freely communicate with the outdoors (see Figure C304.6.2) and shall have a minimum free area of 1 square inch per 3,000 Btu/h (734 mm2/kW) of the total input rating of all appliances located in the enclosure and not less than the sum of the areas of all vent connectors in the space.

FIGURE C304.6.2
SINGLE COMBUSTION AIR OPENING,
ALL AIR FROM THE OUTDOORS
(see Section C304.6.2)

C304.7 Combination Indoor and Outdoor Combustion Air

AMENDMENT
This section has been amended at the state or city level.
The use of a combination of indoor and outdoor combustion air shall be in accordance with Sections C304.7.1 through C304.7.3.

C304.7.1 Indoor Openings

AMENDMENT
This section has been amended at the state or city level.
Where used, openings connecting the interior spaces shall comply with Section C304.5.3.

C304.7.2 Outdoor Opening Location

AMENDMENT
This section has been amended at the state or city level.
Outdoor opening(s) shall be located in accordance with Section C304.6.

C304.7.3 Outdoor Opening(s) Size

AMENDMENT
This section has been amended at the state or city level.
The outdoor opening(s) size shall be calculated in accordance with the following:
  1. The ratio of interior spaces shall be the available volume of all communicating spaces divided by the required volume.
  2. The outdoor size reduction factor shall be one minus the ratio of interior spaces.
  3. The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in accordance with Section C304.6, multiplied by the reduction factor. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

C304.8 Engineered Installations

AMENDMENT
This section has been amended at the state or city level.
Engineered combustion air installations shall provide an adequate supply of combustion, ventilation and dilution air and shall be approved.

C304.9 Mechanical Combustion Air Supply

AMENDMENT
This section has been amended at the state or city level.
Where all combustion air is provided by a mechanical air supply system, the combustion air shall be supplied from the outdoors at a rate not less than 0.35 cubic feet per minute per 1,000 Btu/h (0.034 m3/min per kW) of total input rating of all appliances located within the space.

C304.9.1 Makeup Air

AMENDMENT
This section has been amended at the state or city level.
Where exhaust fans are installed, makeup air shall be provided to replace the exhausted air.

C304.9.2 Appliance Interlock

AMENDMENT
This section has been amended at the state or city level.
Each of the appliances served shall be interlocked with the mechanical air supply system to prevent main burner operation when the mechanical air supply system is not in operation.

C304.9.3 Combined Combustion Air and Ventilation Air System

AMENDMENT
This section has been amended at the state or city level.
Where combustion air is provided by the building's mechanical ventilation system, the system shall provide the specified combustion air rate in addition to the required ventilation air.

C304.10 Louvers and Grilles

AMENDMENT
This section has been amended at the state or city level.
The required size of openings for combustion, ventilation and dilution air shall be based on the net free area of each opening. Where the free area through a design of louver, grille or screen is known, it shall be used in calculating the size opening required to provide the free area specified. Where the design and free area of louvers and grilles are not known, it shall be assumed that wood louvers will have 25-percent free area and metal louvers and grilles will have 75-percent free area. Screens shall have a mesh size not smaller than 1/4 inch (6.4 mm). Nonmotorized louvers and grilles shall be fixed in the open position. Motorized louvers shall be interlocked with the appliance so that they are proven to be in the full open position prior to main burner ignition and during main burner operation. Means shall be provided to prevent the main burner from igniting if the louvers fail to open during burner start-up and to shut down the main burner if the louvers close during operation.

C304.11 Combustion Air Ducts

AMENDMENT
This section has been amended at the state or city level.
Combustion air ducts shall comply with all of the following:
  1. Ducts shall be constructed of galvanized steel complying with Chapter 6 of the Mechanical Code or of a material having equivalent corrosion resistance, strength and rigidity.

    Exception: Within dwellings units, unobstructed stud and joist spaces shall not be prohibited from conveying combustion air, provided that not more than one required fireblock is removed.
  2. Ducts shall terminate in an unobstructed space allowing free movement of combustion air to the appliances.
  3. Ducts shall serve a single enclosure.
  4. Ducts shall not serve both upper and lower combustion air openings where both such openings are used. The separation between ducts serving upper and lower combustion air openings shall be maintained to the source of combustion air.
  5. Ducts shall not be screened where terminating in an attic space.
  6. Horizontal upper combustion air ducts shall not slope downward toward the source of combustion air.
  7. The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air.

    Exception: Direct-vent gas-fired appliances designed for installation in a solid fuel-burning fireplace where installed in accordance with the manufacturer's instructions.
  8. Combustion air intake openings located on the exterior of a building shall have the lowest side of such openings located not less than 12 inches (305 mm) vertically from the adjoining finished ground level.

C304.12 Protection From Fumes and Gases

AMENDMENT
This section has been amended at the state or city level.
Where corrosive or flammable process fumes or gases, other than products of combustion, are present, means for the disposal of such fumes or gases shall be provided. Such fumes or gases include carbon monoxide, hydrogen sulfide, ammonia, chlorine and halogenated hydrocarbons.

     In barbershops, beauty shops and other facilities where chemicals that generate corrosive or flammable products, such as aerosol sprays, are routinely used, nondirect venttype appliances shall be located in a mechanical room separated or partitioned off from other areas with provisions for combustion air and dilution air from the outdoors. Direct-vent appliances shall be installed in accordance with the appliance manufacturer's installation instructions.

Section C305 Installation

AMENDMENT
This section has been amended at the state or city level.

C305.1 General

AMENDMENT
This section has been amended at the state or city level.
Equipment and appliances shall be installed as required by the terms of their approval, in accordance with the conditions of listing, the manufacturer's instructions and this code. Manufacturers' installation instructions shall be available on the job site at the time of inspection. Where a code provision is less restrictive than the conditions of the listing of the equipment or appliance or the manufacturer's installation instructions, the conditions of the listing and the manufacturer's installation instructions shall apply.

     Unlisted appliances approved in accordance with Section C301.3 shall be limited to uses recommended by the manufacturer and shall be installed in accordance with the manufacturer's instructions, the provisions of this code and the requirements determined by the code official.

C305.2 Hazardous Area

AMENDMENT
This section has been amended at the state or city level.
Equipment and appliances having an ignition source shall not be installed in Group H occupancies or control areas where open use, handling or dispensing of combustible, flammable or explosive materials occurs.

C305.3 Elevation of Ignition Source

AMENDMENT
This section has been amended at the state or city level.
Equipment and appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457 mm) above the floor in hazardous locations, public garages, private garages, repair garages, motor fuel-dispensing facilities and parking garages. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate directly with a private garage through openings shall be considered to be part of the private garage.

Exception: Elevation of the ignition source is not required for appliances that are listed as flammable vapor ignition resistant.

C305.3.1 Installation in Residential Garages

AMENDMENT
This section has been amended at the state or city level.
In residential garages where appliances are installed in a separate, enclosed space having access only from outside of the garage, such appliances shall be permitted to be installed at floor level, provided that the required combustion air is taken from the exterior of the garage.

C305.3.2 Parking Garages

AMENDMENT
This section has been amended at the state or city level.
Connection of a parking garage with any room in which there is a fuel-fired appliance shall be by means of a vestibule providing a twodoorway separation, except that a single door is permitted where the sources of ignition in the appliance are elevated in accordance with Section C305.3.

Exception: This section shall not apply to appliance installations complying with Section C305.4.

C305.4 Public Garages

AMENDMENT
This section has been amended at the state or city level.
Appliances located in public garages, motor fuel-dispensing facilities, repair garages or other areas frequented by motor vehicles shall be installed a minimum of 8 feet (2438 mm) above the floor. Where motor vehicles are capable of passing under an appliance, the appliance shall be installed at the clearances required by the appliance manufacturer and not less than 1 foot (305 mm) higher than the tallest vehicle garage door opening.

Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle impact and installed in accordance with Section C305.3.

C305.5 Private Garages

AMENDMENT
This section has been amended at the state or city level.
Appliances located in private garages shall be installed with a minimum clearance of 6 feet (1829 mm) above the floor.

Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle impact and installed in accordance with Section C305.3 (See Figure C304.1).

C305.6 Construction and Protection

AMENDMENT
This section has been amended at the state or city level.
Boiler rooms and furnace rooms shall be protected as required by the Building Code.

C305.7 Clearances From Grade

AMENDMENT
This section has been amended at the state or city level.
Equipment and appliances installed at grade level shall be supported on a level concrete slab or other approved material extending not less than 3- inches (76 mm) above adjoining grade or shall be suspended not less than 6 inches (152 mm) above adjoining grade. Such supports shall be installed in accordance with the manufacturer's installation instructions.

C305.8 Clearances to Combustible Construction

AMENDMENT
This section has been amended at the state or city level.
Heat-producing equipment and appliances shall be installed to maintain the required clearances to combustible construction as specified in the listing and manufacturer's instructions. Such clearances shall be reduced only in accordance with Section C308. Clearances to combustibles shall include such considerations as door swing, drawer pull, overhead projections or shelving and window swing. Devices, such as door stops or limits and closers, shall not be used to provide the required clearances.

C305.9 Parking Structures

AMENDMENT
This section has been amended at the state or city level.
Appliances installed in enclosed, basement and underground parking structures shall be installed in accordance with NFPA 88A.

C305.10 Repair Garages

AMENDMENT
This section has been amended at the state or city level.
Appliances installed in repair garages shall be installed in a detached building or room, separated from repair areas by walls or partitions, floors or floor-ceiling assemblies that are constructed so as to prohibit the transmission of vapors and having a fire-resistance rating of not less than 1 hour, and that have no openings in the wall separating the repair area within 8 feet (2438 mm) of the floor. Wall penetrations shall be firestopped. Air for combustion purposes shall be obtained from the outdoors. The appliance room shall not be used for the storage of combustible materials.

Exceptions:
  1. Overhead heaters where installed not less than 8 feet (2438 mm) above the floor shall be permitted.
  2. Heating appliances for vehicle repair areas where there is no dispensing or transferring of Class I or II flammable or combustible liquids or liquefied petroleum gas shall be installed in accordance with NFPA 30A.

C305.11 Installation in Aircraft Hangars

AMENDMENT
This section has been amended at the state or city level.
Heaters in aircraft hangars shall be installed in accordance with NFPA 409.

C305.12 Avoid Strain on Gas Piping

AMENDMENT
This section has been amended at the state or city level.
Appliances shall be supported and connected to the piping so as not to exert undue strain on the connections.

Section C306 Access and Service Space

AMENDMENT
This section has been amended at the state or city level.

C306.1 Access for Maintenance and Replacement

AMENDMENT
This section has been amended at the state or city level.
Appliances shall be accessible for inspection, service, repair and replacement without disabling the function of a fire-resistance- rated assembly or removing permanent construction, other appliances, or any other piping or ducts not connected to the appliance being inspected, serviced, repaired or replaced. A level working space at least 30 inches deep and 30 inches wide (762 mm by 762 mm) shall be provided in front of the control side to service an appliance.

C306.2 Appliances in Rooms

AMENDMENT
This section has been amended at the state or city level.
Rooms containing appliances shall be provided with a door and an unobstructed passageway measuring not less than 36 inches (914 mm) wide and 80 inches (2032 mm) high.

Exception: Within a dwelling unit, appliances installed in a compartment, alcove, basement or similar space shall be provided with access by an opening or door and an unobstructed passageway measuring not less than 24 inches (610 mm) wide and large enough to allow removal of the largest appliance in the space, provided that a level service space of not less than 30 inches (762 mm) deep and the height of the appliance, but not less than 30 inches (762 mm), is present at the front or service side of the appliance with the door open.

C306.3 Appliances in Attics

AMENDMENT
This section has been amended at the state or city level.
Attics containing appliances shall be provided with an opening and unobstructed passageway large enough to allow removal of the largest appliance. The passageway shall not be less than 30 inches (762 mm) high and 22 inches (559 mm) wide and not more than 20 feet (6096 mm) in length measured along the centerline of the passageway from the opening to the appliance. The passageway shall have continuous solid flooring not less than 24 inches (610 mm) wide. A level service space not less than 30 inches (762 mm) deep and 30 inches (762 mm) wide shall be present at the front or service side of the appliance. The clear access opening dimensions shall be a minimum of 20 inches by 30 inches (508 mm by 762 mm), and large enough to allow removal of the largest appliance.

Exceptions:
  1. The passageway and level service space are not required where the appliance is capable of being serviced and removed through the required opening.
  2. Where the passageway is not less than 6 feet (1829 mm) high for its entire length, the passageway shall be not greater than 50 feet (15 250 mm) in length.

C306.3.1 Electrical Requirements

AMENDMENT
This section has been amended at the state or city level.
A luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be provided at or near the appliance location in accordance with the Electrical Code.

C306.4 Appliances Under Floors

AMENDMENT
This section has been amended at the state or city level.
Under-floor spaces containing appliances shall be provided with an access opening and unobstructed passageway large enough to remove the largest appliance. The passageway shall not be less than 30 inches (762 mm) high and 22 inches (559 mm) wide, nor more than 20 feet (6096 mm) in length measured along the centerline of the passageway from the opening to the appliance. A level service space not less than 30 inches (762 mm) deep and 30 inches (762 mm) wide shall be present at the front or service side of the appliance. If the depth of the passageway or the service space exceeds 12 inches (305 mm) below the adjoining grade, the walls of the passageway shall be lined with concrete or masonry extending 4 inches (102 mm) above the adjoining grade and having sufficient lateral-bearing capacity to resist collapse. The clear access opening dimensions shall be a minimum of 22 inches by 30 inches (559 mm by 762 mm), and large enough to allow removal of the largest appliance.

Exceptions:
  1. The passageway is not required where the level service space is present when the access is open and the appliance is capable of being serviced and removed through the required opening.
  2. Where the passageway is not less than 6 feet high (1829 mm) for its entire length, the passageway shall not be limited in length.

C306.4.1 Electrical Requirements

AMENDMENT
This section has been amended at the state or city level.
A luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be provided at or near the appliance location in accordance with the Electrical Code.

C306.5 Equipment and Appliances on Roofs or Elevated Structures

AMENDMENT
This section has been amended at the state or city level.
Install in accordance with Chapter 3, Section 306.5.

Exception: This section shall not apply to the replacement, repair or maintenance of an existing appliance or piece of equipment lawfully in existence at the time of the adoption of this code.

C306.6 Guards

AMENDMENT
This section has been amended at the state or city level.
Install in accordance with Chapter 3, Section 306.6.

Exception: This section shall not apply to the replacement, repair or maintenance of an existing appliance or piece of equipment lawfully in existence at the time of the adoption of this code.

Section C307 Condensate Disposal

AMENDMENT
This section has been amended at the state or city level.
Note: For additional information on condensate disposal see Chapter 3, Section 307.

C307.1 Evaporators and Cooling Coils

AMENDMENT
This section has been amended at the state or city level.
Condensate drainage systems shall be provided for equipment and appliances containing evaporators and cooling coils in accordance with this section and Chapter 3, Section 307.

C307.2 Fuel-Burning Appliances

AMENDMENT
This section has been amended at the state or city level.
Liquid combustion byproducts of condensing appliances shall be collected and discharged to an approved plumbing fixture or disposal area in accordance with the manufacturer's installation instructions. Condensate piping shall be of approved corrosion-resistant material and shall not be smaller than the drain connection on the appliance. Such piping shall maintain a minimum slope in the direction of discharge of not less than one-eighth unit vertical in 12 units horizontal (1-percent slope).

C307.3 Drain Pipe Materials and Sizes

AMENDMENT
This section has been amended at the state or city level.
Components of the condensate disposal system shall be cast iron, galvanized steel, copper, cross-linked polyethylene, polybutylene, polyethylene, ABS, CPVC or PVC pipe or tubing. All components shall be selected for the pressure and temperature rating of the installation. Condensate waste and drain line size shall be not less than 3/4-inch (19 mm) internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with an approved method.

C307.4 Traps

AMENDMENT
This section has been amended at the state or city level.
Condensate drains shall be trapped as required by the equipment or appliance manufacturer.

C307.5 Auxiliary Drain Pan

AMENDMENT
This section has been amended at the state or city level.
Category IV condensing appliances shall be provided with an auxiliary drain pan where damage to any building component will occur as a result of stoppage in the condensate drainage system. Such pan shall be installed in accordance with the applicable provisions of Chapter 3, Section 307.

Exception: An auxiliary drain pan shall not be required for appliances that automatically shut down operation in the event of a stoppage in the condensate drainage system.

Section C308 Clearance Reduction

AMENDMENT
This section has been amended at the state or city level.

C308.1 Scope

AMENDMENT
This section has been amended at the state or city level.
This section shall govern the reduction in required clearances to combustible materials, including gypsum board, and combustible assemblies for chimneys, vents, appliances, devices and equipment. Clearance requirements for gas-fired air-conditioning equipment and gas-fired central heating boilers and furnaces shall comply with Sections C308.3 and C308.4.

C308.2 Reduction Table

AMENDMENT
This section has been amended at the state or city level.
The allowable clearance reduction shall be based on one of the methods specified in Table C308.2 or shall utilize an assembly listed for such application. Where required clearances are not listed in Table C308.2, the reduced clearances shall be determined by linear interpolation between the distances listed in the table. Reduced clearances shall not be derived by extrapolation below the range of the table. The reduction of the required clearances to combustibles for listed and labeled appliances and equipment shall be in accordance with the requirements of this section except that such clearances shall not be reduced where reduction is specifically prohibited by the terms of the appliance or equipment listing [see Figures C308.2(1) through C308.2(3)].


"A" equals the clearance with no protection.
"B" equals the reduced clearance permitted in accordance with Table C308.2. The protection applied to the construction using combustible material shall extend far enough in each direction to make "C" equal to "A."
FIGURE C308.2(1)
EXTENT OF PROTECTION NECESSARY TO REDUCE
CLEARANCES FROM APPLIANCE OR VENT CONNECTIONS


For SI: 1 inch = 25.4 mm.
FIGURE C308.2(3)
MASONRY CLEARANCE REDUCTION SYSTEM


For SI: 1 inch = 25.4 mm.
FIGURE C308.2(2)
WALL PROTECTOR CLEARANCE REDUCTION SYSTEM


TABLE C308.2 a through k
REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION
TYPE OF PROTECTION APPLIED TO
AND COVERING ALL SURFACES OF COMBUSTIBLE
MATERIAL WITHIN THE DISTANCE SPECIFIED AS THE
REQUIRED CLEARANCE WITH NO PROTECTION
[see Figures C308.2(1), C308.2(2), and C308.2(3)]
WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM
APPLIANCE, VENT CONNECTOR, OR SINGLE-WALL METAL PIPE IS: (inches)
35 18 12 9 6
Allowable clearances with specified protection (inches)
Use Column 1 for clearances above appliance or horizontal connector. Use Column 2
for clearances from appliance, vertical connector and single-wall metal pipe.
Above
Col. 1
Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2
1. 31/2-inch-thick masonry wall without ventilated airspace 24 12 9 6 5
2. 1/2-inch insulation board over 1-inch glass fiber or mineral wool batts 24 18 12 9 9 6 6 5 4 3
3. 0.024-inch (nominal 24 gage) sheet metal over 1-inch glass fiber or mineral wool batts reinforced with wire on rear face with ventilated airspace 18 12 9 6 6 4 5 3 3 3
4. 31/2-inch-thick masonry wall with ventilated airspace 12 6 6 6 6
5. 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace 18 12 9 6 6 4 5 3 3 2
6. 1/2-inch-thick insulation board with ventilated airspace 18 12 9 6 6 4 5 3 3 3
7. 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace over 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace 18 12 9 6 6 4 5 3 3 3
8. 1-inch glass fiber or mineral wool batts sandwiched between two sheets 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace 18 12 9 6 6 4 5 3 3 3
For SI: 1 inch = 25.4 mm, °C = [(°F - 32)/1.8], 1 pound per cubic foot = 16.02 kg/m3, 1 Btu per inch per square foot per hour per °F = 0.144 W/m2 • K.
  1. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing.
  2. All clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding any intervening protection applied to the combustible material.
  3. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector.
  4. For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures C308.2(2) and C308.2(3)].
  5. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace.
  6. Where a wall protector is mounted on a single flat wall away from corners, it shall have a minimum 1-inch air gap. To provide air circulation, the bottom and top edges, or only the side and top edges, or all edges shall be left open.
  7. Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1500°F.
  8. Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu per inch per square foot per hour per °F or less.
  9. There shall be at least 1 inch between the appliance and the protector. In no case shall the clearance between the appliance and the combustible surface be reduced below that allowed in this table.
  10. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable.
  11. Listed single-wall connectors shall be installed in accordance with the manufacturer's installation instructions.

C308.3 Clearances for Indoor Air-Conditioning Appliances

AMENDMENT
This section has been amended at the state or city level.
Clearance requirements for indoor air-conditioning appliances shall comply with Sections C308.3.1 through C308.3.4.

C308.3.1 Appliance Clearances

AMENDMENT
This section has been amended at the state or city level.
Air-conditioning appliances shall be installed with clearances in accordance with the manufacturer's instructions.

C308.3.2 Clearance Reduction

AMENDMENT
This section has been amended at the state or city level.
Air-conditioning appliances shall be permitted to be installed with reduced clearances to combustible material, provided that the combustible material or appliance is protected as described in Table C308.2 and such reduction is allowed by the manufacturer's instructions.

C308.3.3 Plenum Clearances

AMENDMENT
This section has been amended at the state or city level.
Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.

C308.3.4 Clearance From Supply Ducts

AMENDMENT
This section has been amended at the state or city level.
Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance is not required beyond the 3-foot (914 mm) distance.

C308.4 Central-Heating Boilers and Furnaces

AMENDMENT
This section has been amended at the state or city level.
Clearance requirements for central-heating boilers and furnaces shall comply with Sections C308.4.1 through C308.4.5. The clearance to these appliances shall not interfere with combustion air; draft hood clearance and relief; and accessibility for servicing.

C308.4.1 Appliance Clearances

AMENDMENT
This section has been amended at the state or city level.
Central-heating furnaces and low-pressure boilers shall be installed with clearances in accordance with the manufacturer's instructions.

C308.4.2 Clearance Reduction

AMENDMENT
This section has been amended at the state or city level.
Central-heating furnaces and low-pressure boilers shall be permitted to be installed with reduced clearances to combustible material provided that the combustible material or appliance is protected as described in Table C308.2 and such reduction is allowed by the manufacturer's instructions.

C308.4.3 Clearance for Servicing Appliances

AMENDMENT
This section has been amended at the state or city level.
Front clearance shall be sufficient for servicing the burner and the furnace or boiler.

C308.4.4 Plenum Clearances

AMENDMENT
This section has been amended at the state or city level.
Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.

C308.4.5 Clearance From Supply Ducts

AMENDMENT
This section has been amended at the state or city level.
Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance is not required beyond the 3-foot (914 mm) distance.

Section C309 Electrical

AMENDMENT
This section has been amended at the state or city level.

C309.1 Grounding

AMENDMENT
This section has been amended at the state or city level.
Gas piping shall not be used as a grounding electrode.

C309.2 Connections

AMENDMENT
This section has been amended at the state or city level.
Electrical connections between appliances and the building wiring, including the grounding of the appliances, shall conform to the Electrical Code.

Section C310 Electrical Bonding

AMENDMENT
This section has been amended at the state or city level.

C310.1 Pipe and Tubing

AMENDMENT
This section has been amended at the state or city level.
Each above-ground portion of a gas piping system that is likely to become energized shall be electrically continuous and bonded to an effective ground-fault current path. Gas piping shall be considered to be bonded where it is connected to appliances that are connected to the equipment grounding conductor of the circuit supplying that appliance.

Section C401 General

AMENDMENT
This section has been amended at the state or city level.

C401.1 Scope

AMENDMENT
This section has been amended at the state or city level.
This chapter shall govern the design, installation, modification of piping systems. The applicability of this code to piping systems extends from the point of delivery to the connections with the appliances and includes the design, materials, components, fabrication, assembly, installation, testing, inspection of such piping systems.

C401.1.1 Utility Piping Systems Located Within Buildings

AMENDMENT
This section has been amended at the state or city level.
Utility service piping located within buildings shall be installed in accordance with the structural safety and fire protection provisions of the Building Code.

Notice of installation. A "Notice of Installation" is required by the State Fire Marshal for all LP-gas tank installations. Installation requirements of LP-gas tanks and tubing or piping up to the first stage regulator, are under the authority of the State Fire Marshal.

C401.2 Liquefied Petroleum Gas Storage

AMENDMENT
This section has been amended at the state or city level.
The storage system for liquefied petroleum gas shall be designed and installed in accordance with the Fire Code and NFPA 58.

C401.3 Modifications to Existing Systems

AMENDMENT
This section has been amended at the state or city level.
In modifying or adding to existing piping systems, sizes shall be maintained in accordance with this chapter.

C401.4 Additional Appliances

AMENDMENT
This section has been amended at the state or city level.
Where an additional appliance is to be served, the existing piping shall be checked to determine if it has adequate capacity for all appliances served. If inadequate, the existing system shall be enlarged as required or separate piping of adequate capacity shall be provided.

C401.5 Identification

AMENDMENT
This section has been amended at the state or city level.
For other than steel pipe, exposed piping shall be identified by a yellow label marked "Gas" in black letters. The marking shall be spaced at intervals not exceeding 5 feet (1524 mm). The marking shall not be required on pipe located in the same room as the appliance served.

C401.6 Interconnections

AMENDMENT
This section has been amended at the state or city level.
Where two or more meters are installed on the same premises but supply separate consumers, the piping systems shall not be interconnected on the outlet side of the meters.

C401.7 Piping Meter Identification

AMENDMENT
This section has been amended at the state or city level.
Piping from multiple meter installations shall be marked with an approved permanent identification by the installer so that the piping system supplied by each meter is readily identifiable.

C401.8 Minimum Sizes

AMENDMENT
This section has been amended at the state or city level.
All pipe utilized for the installation, extension and alteration of any piping system shall be sized to supply the full number of outlets for the intended purpose and shall be sized in accordance with Section C402.

Section C402 Pipe Sizing

AMENDMENT
This section has been amended at the state or city level.

C402.1 General Considerations

AMENDMENT
This section has been amended at the state or city level.
Piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance.

C402.2 Maximum Gas Demand

AMENDMENT
This section has been amended at the state or city level.
The volumetric flow rate of gas to be provided, in cubic feet per hour, shall be calculated using the manufacturer's input ratings of the appliances served adjusted for altitude. Where an input rating is not indicated, the gas supplier, appliance manufacturer or a qualified agency shall be contacted, or the rating from Table C402.2 shall be used for estimating the volumetric flow rate of gas to be supplied.

     The total connected hourly load shall be used as the basis for pipe sizing, assuming that all appliances could be operating at full capacity simultaneously. Where a diversity of load can be established, pipe sizing shall be permitted to be based on such loads.

TABLE C402.2
APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES
APPLIANCE INPUT BTU/H
(Approx.)
Space Heating Units
 Hydronic boiler
   Single family
   Multifamily, per unit
 Warm-air furnace
   Single family
   Multifamily, per unit


100,000
60,000

100,000
60,000
Space and Water Heating Units
 Hydronic boiler
   Single family
   Multifamily, per unit


120,000
75,000
Water Heating Appliances
 Water heater, automatic instantaneous
   Capacity at 2 gal./minute
   Capacity at 4 gal./minute
   Capacity at 6 gal./minute
 Water heater, automatic storage, 30- to 40-gal. tank
 Water heater, automatic storage, 50-gal. tank
 Water heater, domestic, circulating or side-arm


142,800
285,000
428,400
35,000
50,000
35,000
Cooking Appliances
   Built-in oven or broiler unit, domestic
   Built-in top unit, domestic
   Range, free-standing, domestic

25,000
40,000
65,000
Other Appliances
   Barbecue
   Clothes dryer, Type 1 (domestic)
   Gas fireplace, direct-vent
   Gas light
   Gas log
   Refrigerator

40,000
35,000
40,000
2,500
80,000
3,000
For SI: 1 British thermal unit per hour = 0.293 W, 1 gallon = 3.785 L,
            1 gallon per minute = 3.785 L/m.

C402.3 Sizing

AMENDMENT
This section has been amended at the state or city level.
Gas piping shall be sized in accordance with one of the following:
  1. Pipe sizing tables or sizing equations in accordance with Section C402.4.
  2. The sizing tables included in a listed piping system's manufacturer's installation instructions.
  3. Other approved methods.

C402.4 Sizing Tables and Equations

AMENDMENT
This section has been amended at the state or city level.
Where Tables C402.4(1) through C402.4(37) are used to size piping or tubing, the pipe length shall be determined in accordance with Section C402.4.1, C402.4.2 or C402.4.3.

Where Equations 4-1 and 4-2 are used to size piping or tubing, the pipe or tubing shall have smooth inside walls and the pipe length shall be determined in accordance with Section C402.4.1, C402.4.2 or C402.4.3.
  1. Low-pressure gas equation [Less than 11/2 pounds per square inch (psi) (10.3 kPa)]:

    (Equation 4-1)
  2. High-pressure gas equation [11/2 psi (10.3 kPa) and above]:

    (Equation 4-2)
where:

D = Inside diameter of pipe, inches (mm).
Q = Input rate appliance(s), cubic feet per hour at 60°F (16°C) and 30-inch mercury column.
P1 = Upstream pressure, psia (P1 + 14.7).
P2 = Downstream pressure, psia (P2 + 14.7).
L = Equivalent length of pipe, feet.
ΔH = Pressure drop, inch water column (27.7 inch water column = 1 psi).


TABLE C402.4
Cr AND Y VALUES FOR NATURAL GAS AND UNDILUTED
PROPANE AT STANDARD CONDITIONS
GAS EQUATION FACTORS
Cr Y
Natural gas 0.6094 0.9992
Undiluted propane 1.2462 0.9910
For SI: 1 cubic foot = 0.028 m3, 1 foot = 305 mm,
            1-inch water column = 0.2488 kPa,
            1 pound per square inch = 6.895 kPa,
            1 British thermal unit per hour = 0.293 W.



TABLE C402.4(1)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.3 in. w.c.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4 5 6 8 10 12
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026 5.047 6.065 7.981 10.020 11.938
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 131 273 514 1,060 1,580 3,050 4,860 8,580 17,500 31,700 51,300 105,000 191,000 303,000
20 90 188 353 726 1,090 2,090 3,340 5,900 12,000 21,800 35,300 72,400 132,000 208,000
30 72 151 284 583 873 1,680 2,680 4,740 9,660 17,500 28,300 58,200 106,000 167,000
40 62 129 243 499 747 1,440 2,290 4,050 8,270 15,000 24,200 49,800 90,400 143,000
50 55 114 215 442 662 1,280 2,030 3,590 7,330 13,300 21,500 44,100 80,100 127,000
60 50 104 195 400 600 1,160 1,840 3,260 6,640 12,000 19,500 40,000 72,600 115,000
70 46 95 179 368 552 1,060 1,690 3,000 6,110 11,100 17,900 36,800 66,800 106,000
80 42 89 167 343 514 989 1,580 2,790 5,680 10,300 16,700 34,200 62,100 98,400
90 40 83 157 322 482 928 1,480 2,610 5,330 9,650 15,600 32,100 58,300 92,300
100 38 79 148 304 455 877 1,400 2,470 5,040 9,110 14,800 30,300 55,100 87,200
125 33 70 131 269 403 777 1,240 2,190 4,460 8,080 13,100 26,900 48,800 77,300
150 30 63 119 244 366 704 1,120 1,980 4,050 7,320 11,900 24,300 44,200 70,000
175 28 58 109 224 336 648 1,030 1,820 3,720 6,730 10,900 22,400 40,700 64,400
200 26 54 102 209 313 602 960 1,700 3,460 6,260 10,100 20,800 37,900 59,900
250 23 48 90 185 277 534 851 1,500 3,070 5,550 8,990 18,500 33,500 53,100
300 21 43 82 168 251 484 484 1,360 2,780 5,030 8,150 16,700 30,400 48,100
350 19 40 75 154 231 445 709 1,250 2,560 4,630 7,490 15,400 28,000 44,300
400 18 37 70 143 215 414 660 1,170 2,380 4,310 6,970 14,300 26,000 41,200
450 17 35 66 135 202 389 619 1,090 2,230 4,040 6,540 13,400 24,400 38,600
500 16 33 62 127 191 367 585 1,030 2,110 3,820 6,180 12,700 23,100 36,500
550 15 31 59 121 181 349 556 982 2,000 3,620 5,870 12,100 21,900 34,700
600 14 30 56 115 173 333 530 937 1,910 3,460 5,600 11,500 20,900 33,100
650 14 29 54 110 165 318 508 897 1,830 3,310 5,360 11,000 20,000 31,700
700 13 27 52 106 159 306 488 862 1,760 3,180 5,150 10,600 19,200 30,400
750 13 26 50 102 153 295 470 830 1,690 3,060 4,960 10,200 18,500 29,300
800 12 26 48 99 148 285 454 802 1,640 2,960 4,790 9,840 17,900 28,300
850 12 25 46 95 143 275 439 776 1,580 2,860 4,640 9,530 17,300 27,400
900 11 24 45 93 139 267 426 752 1,530 2,780 4,500 9,240 16,800 26,600
950 11 23 44 90 135 259 413 731 1,490 2,700 4,370 8,970 16,300 25,800
1,000 11 23 43 87 131 252 402 711 1,450 2,620 4,250 8,720 15,800 25,100
1,100 10 21 40 83 124 240 382 675 1,380 2,490 4,030 8,290 15,100 23,800
1,200 NA 20 39 79 119 229 364 644 1,310 2,380 3,850 7,910 14,400 22,700
1,300 NA 20 37 76 114 219 349 617 1,260 2,280 3,680 7,570 13,700 21,800
1,400 NA 19 35 73 109 210 335 592 1,210 2,190 3,540 7,270 13,200 20,900
1,500 NA 18 34 70 105 203 323 571 1,160 2,110 3,410 7,010 12,700 20,100
1,600 NA 18 33 68 102 196 312 551 1,120 2,030 3,290 6,770 12,300 19,500
1,700 NA 17 32 66 98 189 302 533 1,090 1,970 3,190 6,550 11,900 18,800
1,800 NA 16 31 64 95 184 293 517 1,050 1,910 3,090 6,350 11,500 18,300
1,900 NA 16 30 62 93 178 284 502 1,020 1,850 3,000 6,170 11,200 17,700
2,000 NA 16 29 60 90 173 276 488 1,000 1,800 2,920 6,000 10,900 17,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(2)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. w.c.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4 5 6 8 10 12
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026 5.047 6.065 7.981 10.020 11.938
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 172 360 678 1,390 2,090 4,020 6,400 11,300 23,100 41,800 67,600 139,000 252,000 399,000
20 118 247 466 957 1,430 2,760 4,400 7,780 15,900 28,700 46,500 95,500 173,000 275,000
30 95 199 374 768 1,150 2,220 3,530 6,250 12,700 23,000 37,300 76,700 139,000 220,000
40 81 170 320 657 985 1,900 3,020 5,350 10,900 19,700 31,900 65,600 119,000 189,000
50 72 151 284 583 873 1,680 2,680 4,740 9,660 17,500 28,300 58,200 106,000 167,000
60 65 137 257 528 791 1,520 2,430 4,290 8,760 15,800 25,600 52,700 95,700 152,000
70 60 126 237 486 728 1,400 2,230 3,950 8,050 14,600 23,600 48,500 88,100 139,000
80 56 117 220 452 677 1,300 2,080 3,670 7,490 13,600 22,000 45,100 81,900 130,000
90 52 110 207 424 635 1,220 1,950 3,450 7,030 12,700 20,600 42,300 76,900 122,000
100 50 104 195 400 600 1,160 1,840 3,260 6,640 12,000 19,500 40,000 72,600 115,000
125 44 92 173 355 532 1,020 1,630 2,890 5,890 10,600 17,200 35,400 64,300 102,000
150 40 83 157 322 482 928 1,480 2,610 5,330 9,650 15,600 32,100 58,300 92,300
175 37 77 144 296 443 854 1,360 2,410 4,910 8,880 14,400 29,500 53,600 84,900
200 34 71 134 275 412 794 1,270 2,240 4,560 8,260 13,400 27,500 49,900 79,000
250 30 63 119 244 366 704 1,120 1,980 4,050 7,320 11,900 24,300 44,200 70,000
300 27 57 108 221 331 638 1,020 1,800 3,670 6,630 10,700 22,100 40,100 63,400
350 25 53 99 203 305 587 935 1,650 3,370 6,100 9,880 20,300 36,900 58,400
400 23 49 92 189 283 546 870 1,540 3,140 5,680 9,190 18,900 18,900 54,300
450 22 46 86 177 266 512 816 1,440 2,940 5,330 8,620 17,700 32,200 50,900
500 21 43 82 168 251 484 771 1,360 2,780 5,030 8,150 16,700 30,400 48,100
550 20 41 78 159 239 459 732 1,290 2,640 4,780 7,740 15,900 28,900 45,700
600 19 39 74 152 228 438 699 1,240 2,520 4,560 7,380 15,200 27,500 43,600
650 18 38 71 145 218 420 669 1,180 2,410 4,360 7,070 14,500 26,400 41,800
700 17 36 68 140 209 403 643 1,140 2,320 4,190 6,790 14,000 25,300 40,100
750 17 35 66 135 202 389 619 1,090 2,230 4,040 6,540 13,400 24,400 38,600
800 16 34 63 130 195 375 598 1,060 2,160 3,900 6,320 13,000 23,600 37,300
850 16 33 61 126 189 363 579 1,020 2,090 3,780 6,110 12,600 22,800 36,100
900 15 32 59 122 183 352 561 992 2,020 3,660 5,930 12,200 22,100 35,000
950 15 31 58 118 178 342 545 963 1,960 3,550 5,760 11,800 21,500 34,000
1,000 14 30 56 115 173 333 530 937 1,910 3,460 5,600 11,500 20,900 33,100
1,100 14 28 53 109 164 316 503 890 1,810 3,280 5,320 10,900 19,800 31,400
1,200 13 27 51 104 156 301 480 849 1,730 3,130 5,070 10,400 18,900 30,000
1,300 12 26 49 100 150 289 460 813 1,660 3,000 4,860 9,980 18,100 28,700
1,400 12 25 47 96 144 277 442 781 1,590 2,880 4,670 9,590 17,400 27,600
1,500 11 24 45 93 139 267 426 752 1,530 2,780 4,500 9,240 16,800 26,600
1,600 11 23 44 89 134 258 411 727 1,480 2,680 4,340 8,920 16,200 25,600
1,700 11 22 42 86 130 250 398 703 1,430 2,590 4,200 8,630 15,700 24,800
1,800 10 22 41 84 126 242 386 682 1,390 2,520 4,070 8,370 15,200 24,100
1,900 10 21 40 81 122 235 375 662 1,350 2,440 3,960 8,130 14,800 23,400
2,000 NA 20 39 79 119 229 364 644 1,310 2,380 3,850 7,910 14,400 22,700
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(3)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 3.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: Initial supply pressure of 8.0 inches w.c. or greater
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 454 949 1,787 3,669 5,497 10,588 16,875 29,832 43,678
20 312 652 1,228 2,522 3,778 7,277 11,598 20,503 30,020
30 250 524 986 2,025 3,034 5,844 9,314 16,465 24,107
40 214 448 844 1,733 2,597 5,001 7,971 14,092 20,632
50 190 397 748 1,536 2,302 4,433 7,065 12,489 18,286
60 172 360 678 1,392 2,085 4,016 6,401 11,316 16,569
70 158 331 624 1,280 1,919 3,695 5,889 10,411 15,243
80 147 308 580 1,191 1,785 3,437 5,479 9,685 14,181
90 138 289 544 1,118 1,675 3,225 5,140 9,087 13,305
100 131 273 514 1,056 1,582 3,046 4,856 8,584 12,568
125 116 242 456 936 1,402 2,700 4,303 7,608 11,139
150 105 219 413 848 1,270 1,270 3,899 6,893 10,092
175 96 202 380 780 1,169 2,251 3,587 6,342 9,285
200 90 188 353 726 1,087 2,094 3,337 5,900 8,638
250 80 166 313 643 964 1,856 2,958 5,229 7,656
300 72 151 284 583 873 1,681 2,680 4,738 6,937
350 66 139 261 536 803 1,547 2,456 4,359 6,382
400 62 129 243 499 747 1,439 2,294 4,055 5,937
450 58 121 228 468 701 1,350 2,152 3,804 5,570
500 55 114 215 442 662 1,275 2,033 3,594 5,262
550 52 109 204 420 629 1,211 1,931 3,413 4,997
600 50 104 195 400 600 1,156 1,842 3,256 4,767
650 47 99 187 384 575 1,107 1,764 3,118 4,565
700 46 95 179 368 552 1,063 1,695 2,996 4,386
750 44 92 173 355 532 1,024 1,632 2,886 4,225
800 42 89 167 343 514 989 1,576 2,787 4,080
850 41 86 162 332 497 957 1,526 2,697 3,949
900 40 83 157 322 482 928 1,479 2,615 3,828
950 39 81 152 312 468 901 1,436 2,539 3,718
1,000 38 79 148 304 455 877 1,397 2,470 3,616
1,100 36 75 141 289 432 833 1,327 2,346 3,435
1,200 34 71 134 275 412 794 1,266 2,238 3,277
1,300 33 68 128 264 395 761 1,212 2,143 3,138
1,400 31 65 123 253 379 731 1,165 2,059 3,014
1,500 30 63 119 244 366 704 1,122 1,983 2,904
1,600 29 61 115 236 353 680 1,083 1,915 2,804
1,700 28 59 111 228 342 658 1,048 1,854 2,714
1,800 27 57 108 221 331 638 1,017 1,797 2,631
1,900 27 56 105 215 322 619 987 1,745 2,555
2,000 26 54 102 209 313 602 960 1,698 2,485
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(4)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 6.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: Initial supply pressure of 11.0 inches w.c. or greater
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 660 1,380 2,600 5,338 7,999 15,405 24,553 43,405 63,551
20 454 949 1,787 3,669 5,497 10,588 16,875 29,832 43,678
30 364 762 1,435 2,946 4,415 8,502 13,551 23,956 35,075
40 312 652 1,228 2,522 3,778 7,277 11,598 20,503 30,020
50 276 578 1,089 2,235 3,349 6,449 10,279 18,172 26,606
60 250 524 986 2,025 3,034 5,844 9,314 16,465 24,107
70 230 482 907 1,863 2,791 5,376 8,568 15,147 22,178
80 214 448 844 1,733 2,597 5,001 7,971 14,092 20,632
90 201 420 792 1,626 2,437 4,693 7,479 13,222 19,359
100 190 397 748 1,536 2,302 4,433 7,065 12,489 18,286
125 168 352 663 1,361 2,040 3,928 6,261 11,069 16,207
150 153 319 601 1,234 1,848 3,559 5,673 10,029 14,684
175 140 293 553 1,135 1,700 3,275 5,219 9,227 13,509
200 131 273 514 1,056 1,582 3,046 4,856 8,584 12,568
250 116 242 456 936 1,402 2,700 4,303 7,608 11,139
300 105 219 413 848 1,270 2,446 3,899 6,893 10,093
350 96 202 380 780 1,169 2,251 3,587 6,342 9,285
400 90 188 353 726 1,087 2,094 3,337 5,900 8,638
450 84 176 332 681 1,020 1,965 3,131 5,535 8,105
500 80 166 313 643 964 1,856 2,958 5,229 7,656
550 76 158 297 611 915 1,762 2,809 4,966 7,271
600 72 151 284 583 873 1,681 2,680 4,738 6,937
650 69 144 272 558 836 1,610 2,566 4,537 6,643
700 66 139 261 536 803 1,547 2,465 4,359 6,382
750 64 134 252 516 774 1,490 2,375 4,199 6,148
800 62 129 243 499 747 1,439 2,294 4,055 5,937
850 60 125 235 483 723 1,393 2,220 3,924 5,745
900 58 121 228 468 701 1,350 2,152 3,804 5,570
950 56 118 221 454 681 1,311 2,090 3,695 5,410
1,000 55 114 215 442 662 1,275 2,033 3,594 5,262
1,100 52 109 204 420 629 1,211 1,931 3,413 4,997
1,200 50 104 195 400 600 1,156 1,842 3,256 4,767
1,300 47 99 187 384 575 1,107 1,764 3,118 4,565
1,400 46 95 179 368 552 1,063 1,695 2,996 4,386
1,500 44 92 173 355 532 1,024 1,632 2,886 4,225
1,600 42 89 167 343 514 989 1,576 2,787 4,080
1,700 41 86 162 332 497 957 1,526 2,697 3,949
1,800 40 83 157 322 482 928 1,479 2,615 3,828
1,900 39 81 152 312 468 901 1,436 2,539 3,718
2,000 38 79 148 304 455 877 1,397 2,470 3,616
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(5)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 1,510 3,040 5,560 11,400 17,100 32,900 52,500 92,800 189,000
20 1,070 2,150 3,930 8,070 12,100 23,300 37,100 65,600 134,000
30 869 1,760 3,210 6,590 9,880 19,000 30,300 53,600 109,000
40 753 1,520 2,780 5,710 8,550 16,500 26,300 46,400 94,700
50 673 1,360 2,490 5,110 7,650 14,700 23,500 41,500 84,700
60 615 1,240 2,270 4,660 6,980 13,500 21,400 37,900 77,300
70 569 1,150 2,100 4,320 6,470 12,500 19,900 35,100 71,600
80 532 1,080 1,970 4,040 6,050 11,700 18,600 32,800 67,000
90 502 1,010 1,850 3,810 5,700 11,000 17,500 30,900 63,100
100 462 934 1,710 3,510 5,260 10,100 16,100 28,500 58,200
125 414 836 1,530 3,140 4,700 9,060 14,400 25,500 52,100
150 372 751 1,370 2,820 4,220 8,130 13,000 22,900 46,700
175 344 695 1,270 2,601 3,910 7,530 12,000 21,200 43,300
200 318 642 1,170 2,410 3,610 6,960 11,100 19,600 40,000
250 279 583 1,040 2,140 3,210 6,180 9,850 17,400 35,500
300 253 528 945 1,940 2,910 5,600 8,920 15,800 32,200
350 232 486 869 1,790 2,670 5,150 8,210 14,500 29,600
400 216 452 809 1,660 2,490 4,790 7,640 13,500 27,500
450 203 424 759 1,560 2,330 4,500 7,170 12,700 25,800
500 192 401 717 1,470 2,210 4,250 6,770 12,000 24,400
550 182 381 681 1,400 2,090 4,030 6,430 11,400 23,200
600 174 363 650 1,330 2,000 3,850 6,130 10,800 22,100
650 166 348 622 1,280 1,910 3,680 5,870 10,400 21,200
700 160 334 598 1,230 1,840 3,540 5,640 9,970 20,300
750 154 322 576 1,180 1,770 3,410 5,440 9,610 19,600
800 149 311 556 1,140 1,710 3,290 5,250 9,280 18,900
850 144 301 538 1,100 1,650 3,190 5,080 8,980 18,300
900 139 292 522 1,070 1,600 3,090 3,090 8,710 17,800
950 135 283 507 1,040 1,560 3,000 4,780 8,460 17,200
1,000 132 275 493 1,010 1,520 2,920 4,650 8,220 16,800
1,100 125 262 468 960 1,440 2,770 4,420 7,810 15,900
1,200 119 250 446 917 1,370 2,640 4,220 7,450 15,200
1,300 114 239 427 878 1,320 2,530 4,040 7,140 14,600
1,400 110 230 411 843 1,260 2,430 3,880 6,860 14,000
1,500 106 221 396 812 1,220 2,340 3,740 6,600 13,500
1,600 102 214 382 784 1,180 2,260 3,610 6,380 13,000
1,700 99 207 370 759 1,140 2,190 3,490 6,170 12,600
1,800 96 200 358 736 1,100 2,120 3,390 5,980 12,200
1,900 93 195 348 715 1,070 2,060 3,290 5,810 11,900
2,000 91 189 339 695 1,040 2,010 3,200 5,650 5,650
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(6)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure 3.0 psi
Pressure Drop 2.0 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 2,350 4,920 9,270 19,000 28,500 54,900 87,500 155,000 316,000
20 1,620 3,380 6,370 13,100 19,600 37,700 60,100 106,000 217,000
30 1,300 2,720 5,110 10,500 15,700 30,300 48,300 85,400 174,000
40 1,110 2,320 4,380 8,990 13,500 25,900 41,300 73,100 149,000
50 985 2,060 3,880 7,970 11,900 23,000 36,600 64,800 132,000
60 892 1,870 3,520 7,220 10,800 20,800 33,200 58,700 120,000
70 821 1,720 3,230 6,640 9,950 19,200 30,500 54,000 110,000
80 764 1,600 3,010 6,180 9,260 17,800 28,400 50,200 102,000
90 717 1,500 2,820 5,800 8,680 16,700 26,700 47,100 96,100
100 677 1,420 2,670 5,470 8,200 15,800 25,200 44,500 90,800
125 600 1,250 2,360 4,850 7,270 14,000 22,300 39,500 80,500
150 544 1,140 2,140 4,400 6,590 12,700 20,200 35,700 72,900
175 500 1,050 1,970 4,040 6,060 11,700 18,600 32,900 67,100
200 465 973 1,830 3,760 5,640 10,900 17,300 30,600 62,400
250 412 862 1,620 3,330 5,000 9,620 15,300 27,100 55,300
300 374 781 1,470 3,020 4,530 8,720 13,900 24,600 50,100
350 344 719 1,350 2,780 4,170 8,020 12,800 22,600 46,100
400 320 669 1,260 2,590 3,870 7,460 11,900 21,000 42,900
450 300 627 1,180 2,430 3,640 7,000 11,200 19,700 40,200
500 283 593 1,120 2,290 3,430 6,610 10,500 18,600 38,000
550 269 563 1,060 2,180 3,260 6,280 10,000 17,700 36,100
600 257 537 1,010 2,080 3,110 5,990 9,550 16,900 34,400
650 246 514 969 1,990 2,980 5,740 9,150 16,200 33,000
700 236  494 931 1,910 2,860 5,510 8,790 15,500 31,700
750 228 476 897 1,840 2,760 5,310 8,470 15,000 30,500
800 220 460 866 1,780 2,660 5,130 8,180 14,500 29,500
850 213 445 838 1,720 2,580 4,960 7,910 14,000 28,500
900 206 431 812 1,670 2,500 4,810 7,670 13,600 27,700
950 200 419 419 1,620 2,430 4,670 7,450 13,200 26,900
1,000 195 407 767 1,580 2,360 4,550 7,240 12,800 26,100
1,100 185 387 729 1,500 2,240 4,320 6,890 12,200 24,800
1,200 177 369 695 1,430 2,140 4,120 6,570 11,600 23,700
1,300 169 353 666 1,370 2,050 3,940 6,290 11,100 22,700
1,400 162 340 640 1,310 1,970 3,790 6,040 10,700 21,800
1,500 156 327 616 1,270 1,900 3,650 5,820 10,300 21,000
1,600 151 316 595 1,220 1,830 3,530 5,620 10,000 20,300
1,700 146 306 576 1,180 1,770 3,410 5,440 9,610 19,600
1,800 142 296 558 1,150 1,720 3,310 5,270 9,320 19,000
1,900 138 288 542 1,110 1,670 3,210 5,120 9,050 18,400
2,000 134 280 527 1,080 1,620 3,120 4,980 8,800 18,000
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(7)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 3,190 6,430 11,800 24,200 36,200 69,700 111,000 196,000 401,000
20 2,250 4,550 8,320 17,100 25,600 49,300 78,600 139,000 283,000
30 1,840 3,720 6,790 14,000 20,900 40,300 64,200 113,000 231,000
40 1,590 3,220 5,880 12,100 18,100 34,900 55,600 98,200 200,000
50 1,430 2,880 5,260 10,800 16,200 31,200 49,700 87,900 179,000
60 1,300 2,630 4,800 9,860 14,800 28,500 45,400 80,200 164,000
70 1,200 2,430 4,450 9,130 13,700 26,400 42,000 74,300 151,000
80 1,150 2,330 4,260 8,540 12,800 24,700 39,300 69,500 142,000
90 1,060 2,150 3,920 8,050 12,100 23,200 37,000 65,500 134,000
100 979 1,980 3,620 7,430 11,100 21,400 34,200 60,400 123,000
125 876 1,770 3,240 6,640 9,950 19,200 30,600 54,000 110,000
150 786 1,590 2,910 5,960 8,940 17,200 27,400 48,500 98,900
175 728 1,470 2,690 5,520 8,270 15,900 25,400 44,900 91,600
200 673 1,360 2,490 5,100 7,650 14,700 23,500 41,500 84,700
250 558 1,170 2,200 4,510 6,760 13,000 20,800 36,700 74,900
300 506 1,060 1,990 4,090 6,130 11,800 18,800 33,300 67,800
350 465 973 1,830 3,760 5,640 10,900 10,900 30,600 62,400
400 433 905 1,710 3,500 5,250 10,100 16,100 28,500 58,100
450 406 849 1,600 3,290 4,920 9,480 15,100 26,700 54,500
500 384 802 1,510 3,100 4,650 8,950 14,300 25,200 51,500
550 364 762 1,440 2,950 4,420 8,500 13,600 24,000 48,900
600 348 727 1,370 2,810 4,210 8,110 12,900 22,900 46,600
650 333 696 1,310 2,690 4,030 7,770 12,400 21,900 44,600
700 320 669 1,260 2,590 3,880 7,460 11,900 21,000 42,900
750 308 644 1,210 2,490 3,730 7,190 11,500 20,300 41,300
800 298 622 1,170 2,410 3,610 6,940 11,100 19,600 39,900
850 288 602 1,130 2,330 3,490 6,720 10,700 18,900 38,600
900 279 584 1,100 2,260 3,380 6,520 10,400 18,400 37,400
950 271 567 1,070 2,190 3,290 6,330 10,100 17,800 36,400
1,000 264 551 1,040 2,130 3,200 6,150 9,810 17,300 35,400
1,100 250 524 987 2,030 3,030 5,840 9,320 16,500 33,600
1,200 239 500 941 1,930 2,900 5,580 8,890 15,700 32,000
1,300 229 478 901 1,850 2,770 5,340 8,510 15,000 30,700
1,400 220 460 866 1,780 2,660 5,130 8,180 14,500 29,500
1,500 212 443 834 1,710 2,570 4,940 7,880 13,900 28,400
1,600 205 428 806 1,650 2,480 4,770 7,610 13,400 27,400
1,700 198 414 780 1,600 2,400 4,620 7,360 13,000 26,500
1,800 192 401 756 1,550 2,330 4,480 7,140 12,600 25,700
1,900 186 390 734 1,510 2,260 4,350 6,930 12,300 25,000
2,000 181 379 714 1,470 2,200 4,230 6,740 11,900 24,300
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(8)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.3 in. w.c.
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 20 42 85 148 210 448 806 1,270 2,650
20 14 29 58 102 144 308 554 873 1,820
30 11 23 47 82 116 247 445 701 1,460
40 10 20 40 70 99 211 381 600 1,250
50 NA 17 35 62 88 187 337 532 1,110
60 NA 16 32 56 79 170 306 482 1,000
70 NA 14' 29 52 73 156 281 443 924
80 NA 13 27 48 68 145 262 413 859
90 NA 13 26 45 64 136 245 387 806
100 NA 12 24 43 60 129 232 366 761
125 NA 11 22 38 53 114 206 324 675
150 NA 10 20 34 48 103 186 294 612
175 NA NA 18 31 45 95 171 270 563
200 NA NA 17 29 41 89 159 251 523
250 NA NA 15 26 37 78 141 223 464
300 NA NA 13 23 33 71 128 202 420
350 NA NA 12 22 31 65 118 186 387
400 NA NA 11 20 28 61 110 173 360
450 NA NA 11 19 27 57 103 162 338
500 NA NA 10 18 25 54 97 153 319
550 NA NA NA 17 24 51 92 145 303
600 NA NA NA 16 23 49 88 139 289
650 NA NA NA 15 22 47 84 133 277
700 NA NA NA 15 21 45 81 128 266
750 NA NA NA 14 20 43 78 123 256
800 NA NA NA 14 20 42 75 119 247
850 NA NA NA 13 19 40 73 115 239
900 NA NA NA 13 18 39 71 111 232
950 NA NA NA 13 18 38 69 108 225
1,000 NA NA NA 12 17 37 67 105 219
1,100 NA NA NA 12 16 35 63 100 208
1,200 NA NA NA 11 16 34 60 95 199
1,300 NA NA NA 11 15 32 58 91 190
1,400 NA NA NA 10 14 31 56 88 183
1,500 NA NA NA NA 14 30 54 84 176
1,600 NA NA NA NA 13 29 52 82 170
1,700 NA NA NA NA 13 28 50 79 164
1,800 NA NA NA NA 13 27 49 77 159
1,900 NA NA NA NA 12 26 47 74 155
2,000 NA NA NA NA 12 25 46 72 151
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(9)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. w.c.
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 27 55 111 195 276 590 1,060 1,680 3,490
20 18 38 77 134 190 406 730 1,150 2,400
30 15 30 61 107 152 326 586 925 1,930
40 13 26 53 92 131 279 502 791 1,650
50 11 23 47 82 116 247 445 701 1,460
60 10 21 42 74 105 224 403 635 1,320
70 NA 19 39 68 96 206 371 585 1,220
80 NA 18 36 63 90 192 345 544 1,130
90 NA 17 34 59 84 180 324 510 1,060
100 NA 16 32 56 79 170 306 482 1,000
125 NA 14 28 50 70 151 271 427 890
150 NA 13 26 45 64 136 245 387 806
175 NA 12 24 41 59 125 226 356 742
200 NA 11 22 39 55 117 210 331 690
250 NA NA 20 34 48 103 186 294 612
300 NA NA 18 31 44 94 169 266 554
350 NA NA 16 28 40 86 155 245 510
400 NA NA 15 26 38 80 144 228 474
450 NA NA 14 25 35 75 135 214 445
500 NA NA 13 23 33 71 128 202 420
550 NA NA 13 22 32 68 122 192 399
600 NA NA 12 21 30 64 116 183 381
650 NA NA 12 20 29 62 111 175 365
700 NA NA 11 20 28 59 107 168 350
750 NA NA 11 19 27 57 103 162 338
800 NA NA 10 18 26 55 99 156 326
850 NA NA 10 18 25 53 96 151 315
900 NA NA NA 17 24 52 93 147 306
950 NA NA NA 17 24 50 90 143 297
1,000 NA NA NA 16 23 49 88 139 289
1,100 NA NA NA 15 22 46 84 132 274
1,200 NA NA NA 15 21 44 80 126 262
1,300 NA NA NA 14 20 42 76 120 251
1,400 NA NA NA 13 19 41 73 116 241
1,500 NA NA NA 13 18 39 71 111 241
1,600 NA NA NA 13 18 38 68 108 224
1,700 NA NA NA 12 17 37 66 104 217
1,800 NA NA NA 12 17 36 64 101 210
1,900 NA NA NA 11 16 345 62 98 204
2,000 NA NA NA 11 16 34 60 95 199
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(10)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 1.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: SIZING BETWEEN HOUSE LINE REGULATOR AND THE APPLIANCE
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 39 80 162 283 402 859 1,550 2,440 5,080
20 27 55 111 195 276 590 1,060 1,680 3,490
30 21 44 89 156 222 474 853 853 2,800
40 18 38 77 134 190 406 730 1,150 2,400
50 16 33 68 119 168 359 647 1,020 2,130
60 15 30 61 107 152 326 586 925 1,930
70 13 28 28 99 140 300 539 851 1,770
80 13 26 53 92 131 279 502 791 1,650
90 12 24 49 86 122 262 471 742 1,550
100 11 23 47 82 116 247 445 701 1,460
125 NA 20 41 72 103 219 394 622 1,290
150 NA 18 37 65 93 198 357 563 1,170
175 NA 17 34 60 85 183 329 518 1,080
200 NA 16 32 56 79 170 306 482 1,000
250 NA 14 28 50 70 151 271 427 890
300 NA 13 26 45 64 136 245 387 806
350 NA 12 24 41 59 125 226 356 742
400 NA 11 22 39 55 117 210 331 690
450 NA 10 21 36 51 110 197 311 647
500 NA NA 20 34 48 103 186 294 612
550 NA NA 19 32 46 98 177 279 581
600 NA 'NA 18 31 44 94 169 266 554
650 NA NA 17 30 42 90 162 255 531
700 NA NA 16 28 40 86 155 245 510
750 NA NA 16 27 39 83 150 236 491
800 NA NA 15 26 38 80 144 228 474
850 NA NA 15 26 36 78 140 220 459
900 NA NA 14 25 35 75 135 214 445
950 NA NA 14 24 34 73 132 207 432
1,000 NA NA 13 23 33 71 128 202 420
1,100 NA NA 13 22 32 68 122 192 399
1,200 NA NA 12 21 30 64 116 183 381
1,300 NA NA 12 20 29 62 111 175 365
1,400 NA NA 11 20 20 59 107 168 350
1,500 NA NA 11 19 27 57 103 162 338
1,600 NA NA 10 18 26 55 99 156 326
1,700 NA NA 10 18 25 53 96 151 315
1,800 NA NA NA 17 24 52 93 147 306
1,900 NA NA NA 17 24 50 90 143 297
2,000 NA NA NA 16 23 49 88 139 289
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(11)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 17.0 in. w.c.
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 190 391 796 1,390 1,970 4,220 7,590 12,000 24,900
20 130 269 547 956 1,360 2,900 5,220 8,230 17,100
30 105 216 439 768 1,090 2,330 4,190 6,610 13,800
40 90 185 376 657 932 1,990 3,590 5,650 11,800
50 79 164 333 582 826 1,770 3,180 5,010 10,400
60 72 148 302 528 749 1,600 2,880 4,540 9,460
70 66 137 278 486 689 1,470 2,650 4,180 8,700
80 62 127 258 452 641 1,370 2,460 3,890 8,090
90 58 119 243 424 601 1,280 2,310 3,650 7,590
100 55 113 229 400 568 1,210 2,180 3,440 7,170
125 48 100 203 355 503 1,080 1,940 3,050 6,360
150 44 90 184 321 456 974 1,750 2,770 5,760
175 40 83 169 296 420 896 1,610 2,540 5,300
200 38 77 157 275 390 834 1,500 2,370 4,930
250 33 69 140 244 346 346 1,330 2,100 4,370
300 30 62 126 221 313 670 1,210 1,900 3,960
350 28 57 116 203 288 616 1,110 1,750 3,640
400 26 53 108 189 268 573 1,030 1,630 3,390
450 24 50 102 177 252 538 968 1,530 3,180
500 23 47 96 168 238 508 914 1,440 3,000
550 22 45 45 159 226 482 868 1,370 2,850
600 21 43 87 152 215 460 829 1,310 2,720
650 20 41 83 145 206 441 793 1,250 2,610
700 19 39 80 140 198 423 762 1,200 2,500
750 18 38 77 135 191 408 734 1,160 1,160
800 18 37 74 130 184 394 709 1,120 2,330
850 17 35 72 126 178 381 686 1,080 2,250
900 17 34 70 122 173 370 665 1,050 2,180
950 16 33 68 118 168 359 646 1,020 2,120
1,000 16 32 66 115 163 349 628 991 2,060
1,100 15 31 63 155 155 332 597 941 1,960
1,200 14 29 60 104 148 316 569 898 1,870
1,300 14 28 57 100 142 303 545 860 1,790
1,400 13 27 55 96 136 291 524 826 1,720
1,500 13 26 53 93 131 280 505 796 1,660
1,600 12 25 51 89 127 271 487 768 1,600
1,700 12 24 49 86 123 262 472 744 1,550
1,800 11 24 48 84 119 254 457 721 1,500
1,900 11 23 47 81 115 247 444 700 1,460
2,000 11 22 45 79 112 240 432 681 1,420
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(12)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 245 506 1,030 1,800 2,550 5,450 9,820 15,500 32,200
20 169 348 708 1,240 1,760 3,750 6,750 10,600 22,200
30 135 279 568 568 1,410 3,010 5,420 8,550 17,800
40 116 239 486 850 1,210 2,580 4,640 7,310 15,200
50 103 212 431 754 1,070 2,280 4,110 6,480 13,500
60 93 192 391 683 969 2,070 3,730 5,870 12,200
70 86 177 359 628 891 1,900 3,430 5,400 11,300
80 80 164 334 584 829 1,770 3,190 5,030 10,500
90 75 154 314 548 778 1,660 2,990 4,720 9,820
100 71 146 296 518 735 1,570 2,830 4,450 9,280
125 63 129 263 459 651 1,390 2,500 3,950 8,220
150 57 117 238 416 590 1,260 2,270 3,580 7,450
175 52 108 219 383 543 1,160 2,090 3,290 6,850
200 49 100 204 356 505 1,080 1,940 3,060 6,380
250 43 89 181 315 448 956 1,720 2,710 5,650
300 39 80 164 286 406 866 1,560 2,460 5,120
350 36 74 150 263 373 797 1,430 2,260 4,710
400 33 69 140 245 347 741 1,330 2,100 4,380
450 31 65 131 230 326 696 1,250 1,970 4,110
500 30 61 124 217 308 657 1,180 1,870 3,880
550 28 58 118 206 292 624 1,120 1,770 3,690
600 27 55 112 196 279 595 1,070 1,690 3,520
650 26 53 108 188 267 570 1,030 1,620 3,370
700 25 51 103 181 256 548 986 1,550 3,240
750 24 49 100 174 247 528 950 1,500 3,120
800 23 47 96 168 239 510 917 1,450 3,010
850 22 46 93 163 231 493 888 1,400 2,920
900 22 44 90 158 224 478 861 1,360 2,830
950 21 43 88 153 217 464 836 1,320 2,740
1,000 20 42 85 149 211 452 813 1,280 2,670
1,100 19 40 81 142 201 429 772 1,220 2,540
1,200 18 38 77 135 192 409 737 1,160 2,420
1,300 18 36 74 129 183 392 705 1,110 2,320
1,400 17 35 71 124 176 376 678 1,070 2,230
1,500 16 34 68 120 170 363 653 1,030 2,140
1,600 16 33 66 116 164 350 630 994 2,070
1,700 15 31 64 112 159 339 610 962 2,000
1,800 15 30 62 108 154 329 592 933 933
1,900 14 30 60 105 149 319 575 906 1,890
2,000 14 29 59 102 145 310 559 881 1,830
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(13)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.5 psi
Specific Gravity 0.60
INTENDED USE Pipe sizing between point of delivery and the house line regulator.
Total load supplied by a single house line regulator not exceeding 150 cubic feet per hour.
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 303 625 1,270 2,220 3,150 6,740 12,100 19,100 39,800
20 208 430 874 1,530 2,170 4,630 8,330 13,100 27,400
30 167 345 702 1,230 1,740 3,720 6,690 10,600 22,000
40 143 295 601 1,050 1,490 3,180 5,730 9,030 18,800
50 127 262 532 931 1,320 2,820 5,080 8,000 16,700
60 115 237 482 843 1,200 2,560 4,600 7,250 15,100
70 106 218 444 444 1,100 2,350 4,230 6,670 13,900
80 98 203 413 722 1,020 2,190 3,940 6,210 12,900
90 92 190 387 677 961 2,050 3,690 5,820 12,100
100 87 180 366 640 907 1,940 3,490 3,490 11,500
125 77 159 324 567 804 1,720 3,090 4,880 10,200
150 70 144 294 514 729 1,560 2,800 4,420 9,200
175 64 133 270 472 670 1,430 2,580 4,060 8,460
200 60 124 252 440 624 1,330 2,400 3,780 7,870
250 53 110 223 390 553 1,180 2,130 3,350 6,980
300 48 99 99 353 501 1,070 1,930 3,040 6,320
350 44 91 186 325 461 984 1,770 2,790 5,820
400 41 85 173 302 302 916 1,650 2,600 5,410
450 39 80 162 283 402 859 1,550 2,440 5,080
500 36 75 153 268 268 811 1,460 2,300 4,800
550 35 72 146 254 361 771 1,390 2,190 4,560
600 33 68 139 243 344 735 1,320 2,090 4,350
650 32 65 133 232 330 704 1,270 1,270 4,160
700 30 63 128 223 317 676 1,220 1,920 4,000
750 29 60 123 215 305 652 1,170 1,850 3,850
800 28 58 119 208 295 629 1,130 1,790 3,720
850 27 57 115 201 285 609 1,100 1,730 3,600
900 27 55 111 195 276 590 1,060 1,680 3,490
950 26 53 108 189 268 573 1,030 1,630 3,390
1,000 25 52 105 184 261 558 1,000 1,580 3,300
1,100 24 49 100 175 248 530 954 1,500 3,130
1,200 23 47 95 167 237 505 910 1,430 2,990
1,300 22 45 91 160 227 484 871 1,370 2,860
1,400 21 43 88 153 218 465 837 1,320 2,750
1,500 20 42 85 148 210 448 806 1,270 2,650
1,600 19 40 82 143 202 432 779 1,230 2,560
1,700 19 39 79 138 196 419 753 1,190 2,470
1,800 18 38 77 134 190 406 731 1,150 2,400
1,900 18 37 74 130 184 394 709 1,120 2,330
2,000 17 36 72 126 179 383 690 1,090 2,270
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. Where this table is used to size the tubing upstream of a line pressure regulator, the pipe or tubing downstream of the line pressure regulator shall be sized using a pressure drop not greater than 1 inch w.c.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(14)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 511 1,050 2,140 3,750 5,320 11,400 20,400 32,200 67,100
20 351 724 1,470 2,580 3,650 7,800 14,000 22,200 46,100
30 282 582 1,180 2,070 2,930 6,270 11,300 17,800 37,000
40 241 498 1,010 1,770 2,510 5,360 9,660 15,200 31,700
50 214 441 898 1,570 2,230 4,750 8,560 13,500 28,100
60 194 400 813 1,420 2,020 4,310 7,750 12,200 25,500
70 178 368 748 1,310 1,860 3,960 7,130 11,200 23,400
80 166 342 696 1,220 1,730 3,690 6,640 10,500 21,800
90 156 321 653 1,140 1,620 3,460 6,230 9,820 20,400
100 147 303 617 1,080 1,530 3,270 5,880 9,270 19,300
125 130 269 547 955 1,360 2,900 5,210 8,220 17,100
150 118 243 495 866 1,230 2,620 4,720 7,450 15,500
175 109 224 456 796 1,130 2,410 4,350 6,850 14,300
200 101 208 424 741 1,050 2,250 4,040 6,370 13,300
250 90 185 376 657 932 1,990 3,580 5,650 11,800
300 81 167 340 595 844 1,800 3,250 5,120 10,700
350 75 154 313 547 777 1,660 2,990 4,710 9,810
400 69 143 291 509 722 1,540 2,780 4,380 9,120
450 65 134 273 478 678 1,450 2,610 4,110 8,560
500 62 127 258 451 640 1,370 2,460 3,880 8,090
550 58 121 245 429 608 1,300 2,340 3,690 7,680
600 56 115 234 409 580 1,240 2,230 3,520 7,330
650 53 110 224 392 556 1,190 2,140 3,370 7,020
700 51 106 215 376 534 1,140 2,050 3,240 6,740
750 49 102 207 362 514 1,100 1,980 3,120 6,490
800 48 98 200 350 497 1,060 1,910 3,010 6,270
850 46 95 194 339 481 1,030 1,850 2,910 6,070
900 45 92 188 328 466 1,000 1,790 2,820 5,880
950 43 90 182 319 452 967 1,740 2,740 5,710
1,000 42 87 177 310 440 940 1,690 2,670 5,560
1,100 40 83 169 295 418 893 1,610 2,530 5,280
1,200 38 79 161 281 399 852 1,530 2,420 5,040
1,300 37 76 154 269 382 816 1,470 2,320 4,820
1,400 35 73 148 259 367 784 1,410 2,220 4,630
1,500 34 70 143 249 353 755 1,360 2,140 4,460
1,600 33 68 138 241 341 729 1,310 2,070 4,310
1,700 32 65 133 233 330 705 1,270 2,000 4,170
1,800 31 63 129 226 320 684 1,230 1,940 4,040
1,900 30 62 125 219 311 664 1,200 1,890 3,930
2,000 29 60 122 213 302 646 1,160 1,830 3,820
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(15)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. w.c.
Specific Gravity 0.60
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
5 46 63 115 134 225 270 471 546 895 1,037 1,790 2,070 3,660 4,140
10 32 44 82 95 161 192 330 383 639 746 1,260 1,470 2,600 2,930
15 25 35 66 77 132 157 267 310 524 615 1,030 1,200 2,140 2,400
20 22 31 58 67 116 137 231 269 456 536 888 1,050 1,850 2,080
25 19 27 52 60 104 122 206 240 409 482 793 936 1,660 1,860
30 18 25 47 55 96 112 188 218 374 442 723 856 1,520 1,700
40 15 21 41 47 83 97 162 188 325 386 625 742 1,320 1,470
50 13 19 37 42 75 87 144 168 292 347 559 665 1,180 1,320
60 12 17 34 38 68 80 131 153 267 318 509 608 1,080 1,200
70 11 16 31 36 63 74 121 141 248 295 471 563 1,000 1,110
80 10 15 29 33 60 69 113 132 232 277 440 527 940 1,040
90 10 14 28 32 57 65 107 125 219 262 415 498 887 983
100 9 13 26 30 54 62 101 118 208 249 393 472 843 933
150 7 10 20 23 42 48 78 91 171 205 320 387 691 762
200 6 9 18 21 38 44 71 82 148 179 277 336 600 661
250 5 8 16 19 34 39 63 74 133 161 247 301 538 591
300 5 7 15 17 32 36 57 67 95 148 226 275 492 540
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(16)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 3.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: Initial supply pressure of 8.0 inches w.c. or greater
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
5 120 160 277 327 529 649 1,180 1,370 2,140 4,430 5,010 8,800 10,100
10 83 112 197 231 380 462 828 958 1,530 3,200 3,560 6,270 7,160
15 67 90 161 189 313 379 673 778 1,250 2,540 2,910 5,140 5,850
20 57 78 140 164 273 329 580 672 1,090 2,200 2,530 4,460 5,070
25 51 69 125 147 245 295 518 599 978 1,960 2,270 4,000 4,540
30 46 63 115 134 225 270 471 546 895 1,790 2,070 3,660 4,140
40 39 54 100 116 196 234 407 471 778 1,550 1,800 3,180 3,590
50 35 48 89 104 176 210 363 421 698 1,380 1,610 2,850 3,210
60 32 44 82 95 161 192 330 383 639 1,260 1,470 2,600 2,930
70 29 41 76 88 150 178 306 355 593 1,170 1,360 2,420 2,720
80 27 38 71 82 141 167 285 331 555 1,090 1,280 2,260 2,540
90 26 36 67 77 133 157 268 311 524 1,030 1,200 2,140 2,400
100 24 34 63 73 126 149 254 295 498 974 1,140 2,030 2,030
150 19 27 52 60 104 122 206 240 409 793 936 1,660 1,860
200 17 23 45 52 91 106 178 207 355 686 812 1,440 1,610
250 15 21 40 46 82 95 159 184 319 613 728 1,290 1,440
300 13 15 37 42 75 87 144 168 234 559 665 1,180 1,320
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(17)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 6.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: Initial supply pressure of 11.0 inches w.c. or greater
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
5 173 229 389 461 737 911 1,690 1,950 3,000 6,280 7,050 12,400 14,260
10 120 160 277 327 529 649 1,180 1,370 2,140 4,430 5,010 8,800 10,100
15 96 130 227 267 436 532 960 1,110 1,760 3,610 4,100 7,210 8,260
20 83 112 197 231 380 462 828 958 1,530 3,120 3,560 6,270 7,160
25 74 99 176 207 342 414 739 855 1,370 2,790 3,190 5,620 6,400
30 67 90 161 189 313 379 673 778 1,250 2,540 2,910 5,140 5,850
40 57 78 140 164 273 329 580 672 1,090 2,200 2,530 4,460 5,070
50 51 69 125 147 245 295 518 599 978 1,960 2,270 4,000 4,540
60 46 63 115 134 225 270 471 546 895 1,790 2,070 3,660 4,140
70 42 58 106 124 209 250 435 505 830 1,660 1,920 3,390 3,840
80 39 54 100 116 196 234 407 471 778 1,550 1,800 3,180 3,590
90 37 51 94 109 185 221 383 444 735 1,460 1,700 3,000 3,390
100 35 48 89 104 176 210 363 421 698 1,380 1,610 2,850 3,210
150 28 39 73 85 145 172 294 342 573 1,130 1,320 2,340 2,630
200 24 34 63 73 126 149 254 295 498 974 1,140 2,030 2,280
250 21 30 57 66 114 134 226 263 447 870 1,020 1,820 2,040
300 19 27 52 60 104 122 206 240 409 793 936 1,660 1,860
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(18)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure 2 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 270 353 587 700 1,100 1,370 2,590 2,990 4,510 5,037 9,600 10,700 18,600 21,600
25 166 220 374 444 709 876 1,620 1,870 2,890 3,258 6,040 6,780 11,900 13,700
30 151 200 342 405 650 801 1,480 1,700 2,640 2,987 5,510 6,200 10,900 12,500
40 129 172 297 351 567 696 1,270 1,470 2,300 2,605 4,760 5,380 9,440 10,900
50 115 154 266 314 510 624 1,140 1,310 2,060 2,343 4,260 4,260 8,470 9,720
75 93 124 218 257 420 512 922 1,070 1,690 1,932 3,470 3,950 6,940 7,940
80 89 120 211 249 407 496 892 1,030 1,640 1,874 3,360 3,820 6,730 7,690
100 79 107 189 222 366 445 795 920 1,470 1,685 3,000 3,420 6,730 7,690
150 64 87 155 182 302 364 646 748 1,210 1,389 2,440 2,800 4,940 5,620
200 55 75 135 135 135 317 557 645 1,050 1,212 2,110 2,430 4,290 4,870
250 49 67 121 141 236 284 497 576 941 1,090 1,890 2,180 3,850 4,360
300 44 61 110 129 217 260 453 525 862 999 1,720 1,990 3,520 3,980
400 38 52 96 111 189 225 390 453 749 871 1,490 1,730 3,060 3,450
500 34 46 86 100 170 202 348 404 552 783 1,330 1,550 2,740 3,090
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 3/4 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
TABLE C402.4(19)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 0.60
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 523 674 1,080 1,300 2,000 2,530 4,920 5,660 8,300 9,140 18,100 19,800 34,400 40,400
25 322 420 691 827 1,290 1,620 3,080 3,540 5,310 5,911 11,400 12,600 22,000 25,600
30 292 382 632 755 1,180 1,480 2,800 3,230 4,860 5,420 10,400 11,500 20,100 23,400
40 251 329 549 654 1,030 1,280 2,420 2,790 4,230 4,727 8,970 10,000 17,400 20,200
50 223 293 492 586 926 1,150 2,160 2,490 3,790 4,251 8,020 8,930 15,600 18,100
75 180 238 403 479 763 944 1,750 2,020 3,110 3,506 6,530 7,320 12,800 14,800
80 174 230 391 463 740 915 1,690 1,960 3,020 3,400 6,320 7,090 12,400 14,300
100 154 205 205 415 665 820 1,510 1,740 2,710 3,057 5,650 6,350 11,100 12,800
150 124 166 287 339 548 672 1,230 1,420 2,220 2,521 4,600 5,200 9,130 10,500
200 107 143 249 294 478 584 1,060 1,220 1,930 2,199 3,980 4,510 7,930 9,090
250 95 128 223 263 430 524 945 1,090 1,730 1,977 3,550 4,040 7,110 8,140
300 86 116 204 240 394 479 860 995 1,590 1,813 3,240 3,690 6,500 7,430
400 74 100 177 208 343 416 742 858 1,380 1,581 2,800 3,210 5,650 6,440
500 66 89 159 186 309 373 662 766 1,040 1,422 2,500 2,870 5,060 5,760
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 3/4 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
TABLE C402.4(20)
POLYETHYLENE PLASTIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.3 in. w.c.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal OD 1/2 3/4 1 11/4 11/2 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 1.943 3.682
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 153 305 551 955 1,440 2,590 7,170 13,900
20 105 210 379 656 991 1,780 4,920 9,520
30 84 169 304 527 796 1,430 3,950 7,640
40 72 144 260 451 681 1,220 3,380 6,540
50 64 128 231 400 604 6,540 3,000 5,800
60 58 116 209 362 547 983 2,720 5,250
70 53 107 192 333 503 904 2,500 4,830
80 50 99 179 310 468 841 2,330 4,500
90 46 93 168 291 439 789 2,180 4,220
100 44 88 159 275 415 745 2,060 3,990
125 39 78 141 243 368 661 1,830 3,530
150 35 71 127 221 333 598 1,660 3,200
175 32 65 117 203 306 551 1,520 2,940
200 30 60 109 189 285 512 1,420 2,740
250 27 54 97 167 253 454 1,260 2,430
300 24 48 88 152 229 411 1,140 2,200
350 22 45 81 139 211 378 1,050 2,020
400 21 42 75 130 196 352 974 1,880
450 19 39 70 122 184 330 914 1,770
500 18 37 66 115 174 312 863 1,670
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(21)
POLYETHYLENE PLASTIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. w.c.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal OD 1/2 3/4 1 11/4 11/2 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 1.943 3.682
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 201 403 726 1,260 1,900 3,410 9,450 18,260
20 138 277 499 865 1,310 2,350 6,490 12,550
30 111 222 401 695 1,050 1,880 5,210 10,080
40 95 190 343 594 898 1,610 4,460 8,630
50 84 169 304 527 796 1,430 3,950 7,640
60 76 153 276 477 721 1,300 3,580 6,930
70 70 140 254 439 663 1,190 3,300 6,370
80 65 131 236 409 617 1,110 3,070 5,930
90 61 123 221 383 579 1,040 2,880 5,560
100 58 116 209 362 547 983 2,720 5,250
125 51 103 185 321 485 871 2,410 4,660
150 46 93 168 291 439 789 2,180 4,220
175 43 86 154 268 404 726 2,010 3,880
200 40 80 144 249 376 675 1,870 3,610
250 35 71 127 221 333 598 1,660 3,200
300 32 64 115 200 302 542 1,500 2,900
350 29 59 106 184 278 499 1,380 2,670
400 27 55 99 171 258 464 1,280 2,480
450 26 51 93 160 242 435 1,200 2,330
500 24 48 88 152 229 411 1,140 2,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(22)
POLYETHYLENE PLASTIC PIPE
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal OD 1/2 3/4 1 11/4 11/2 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 1,860 3,720 6,710 11,600 17,600 31,600 87,300 169,000
20 1,280 2,560 4,610 7,990 12,100 21,700 60,000 116,000
30 1,030 2,050 3,710 6,420 9,690 17,400 48,200 93,200
40 878 1,760 3,170 5,490 8,300 14,900 41,200 79,700
50 778 1,560 2,810 4,870 7,350 13,200 36,600 70,700
60 705 1,410 2,550 4,410 6,660 12,000 33,100 64,000
70 649 1,300 2,340 4,060 6,130 11,000 30,500 58,900
80 603 1,210 2,180 3,780 5,700 10,200 28,300 54,800
90 566 1,130 2,050 3,540 5,350 9,610 26,600 51,400
100 535 1,070 1,930 3,350 5,050 9,080 25,100 48,600
125 474 949 1,710 2,970 4,480 8,050 22,300 43,000
150 429 860 1,550 2,690 4,060 7,290 20,200 39,000
175 395 791 1,430 2,470 3,730 6,710 18,600 35,900
200 368 736 1,330 2,300 3,470 6,240 17,300 33,400
250 326 652 1,180 2,040 3,080 5,530 15,300 29,600
300 295 591 1,070 1,850 2,790 5,010 13,900 26,800
350 272 544 981 1,700 2,570 4,610 12,800 24,700
400 253 506 913 1,580 2,390 4,290 11,900 22,900
450 237 475 856 1,480 2,240 4,020 11,100 21,500
500 224 448 809 1,400 2,120 3,800 10,500 20,300
550 213 213 768 1,330 2,010 3,610 9,990 19,300
600 203 406 733 1,270 1,920 3,440 9,530 18,400
650 194 389 702 1,220 1,840 3,300 9,130 17,600
700 187 374 674 1,170 1,760 3,170 8,770 16,900
750 180 360 649 1,130 1,700 3,050 8,450 16,300
800 174 348 627 1,090 1,640 2,950 8,160 15,800
850 168 336 607 1,050 1,590 2,850 7,890 15,300
900 163 326 588 1,020 1,540 2,770 7,650 14,800
950 158 317 572 990 1,500 2,690 7,430 14,400
1,000 154 308 556 963 1,450 2,610 7,230 14,000
1,100 146 293 528 915 1,380 2,480 6,870 13,300
1,200 139 279 504 873 1,320 2,370 6,550 12,700
1,300 134 267 482 836 1,260 2,270 6,270 12,100
1,400 128 257 463 803 1,210 2,180 6,030 11,600
1,500 124 247 446 773 1,170 2,100 5,810 11,200
1,600 119 239 431 747 1,130 2,030 5,610 10,800
1,700 115 231 417 723 1,090 1,960 5,430 10,500
1,800 112 224 404 701 1,060 1,900 5,260 10,200
1,900 109 218 393 680 1,030 1,850 5,110 9,900
2,000 106 212 382 662 1,000 1,800 4,970 9,600
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(23)
POLYETHYLENE PLASTIC TUBING
Gas Natural
Inlet Pressure Less than 2.0 psi
Pressure Drop 0.3 in. w.c.
Specific Gravity 0.60
  PLASTIC TUBING SIZE (CTS) (inch)
Nominal OD 1/2 1/4
Designation SDR 7 SDR 11
Actual ID 0.445 0.927
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 54 372
20 37 256
30 30 205
40 26 176
50 23 156
60 21 141
70 19 130
80 18 121
90 17 113
100 16 107
125 14 95
150 13 86
175 12 79
200 11 74
225 10 69
250 NA 65
275 NA 62
300 NA 59
350 NA 54
400 NA 51
450 NA 47
500 NA 45
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,
            1 pound per square inch = 6.895 kPa,
            1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W,
            1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(24)
POLYETHYLENE PLASTIC TUBING
Gas Natural
Inlet Pressure Less than 2.0 psi
Pressure Drop 0.5 in. w.c.
Specific Gravity 0.60
  PLASTIC TUBING SIZE (CTS) (inch)
Nominal OD 1/2 1/4
Designation SDR 7 SDR 11
Actual ID 0.445 0.927
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 72 490
20 49 337
30 39 271
40 34 232
50 30 205
60 27 186
70 25 171
80 23 159
90 22 149
100 21 141
125 18 125
150 17 113
175 15 104
200 14 97
225 13 91
250 12 86
275 11 82
300 11 78
350 10 72
400 NA 67
450 NA 63
500 NA 59
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,
            1 pound per square inch = 6.895 kPa,
            1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W,
            1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(25)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 10.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 3,320 6,950 13,100 26,900 40,300 77,600 124,000 219,000 446,000
20 2,280 4,780 9,000 18,500 27,700 53,300 85,000 150,000 306,000
30 1,830 3,840 7,220 14,800 22,200 42,800 68,200 121,000 246,000
40 1,570 3,280 6,180 12,700 19,000 36,600 58,400 103,000 211,000
50 1,390 2,910 5,480 11,300 16,900 32,500 51,700 91,500 187,000
60 1,260 2,640 4,970 10,200 15,300 29,400 46,900 82,900 169,000
70 1,160 2,430 4,570 9,380 14,100 27,100 43,100 76,300 156,000
80 1,080 2,260 4,250 8,730 13,100 25,200 40,100 70,900 145,000
90 1,010 2,120 3,990 8,190 12,300 23,600 37,700 66,600 136,000
100 956 2,000 3,770 7,730 11,600 22,300 35,600 62,900 128,000
125 848 1,770 3,340 6,850 10,300 19,800 31,500 55,700 114,000
150 768 1,610 3,020 6,210 9,300 17,900 28,600 50,500 103,000
175 706 1,480 2,780 5,710 8,560 16,500 26,300 46,500 94,700
200 657 1,370 2,590 5,320 7,960 15,300 24,400 43,200 88,100
250 582 1,220 2,290 4,710 7,060 13,600 21,700 38,300 78,100
300 528 1,100 2,080 4,270 6,400 12,300 19,600 34,700 70,800
350 486 1,020 1,910 3,930 5,880 11,300 18,100 31,900 65,100
400 452 945 1,780 3,650 5,470 10,500 16,800 29,700 60,600
450 424 886 1,670 3,430 5,140 9,890 15,800 27,900 56,800
500 400 837 1,580 3,240 4,850 4,850 14,900 26,300 53,700
550 380 795 1,500 3,070 4,610 8,870 14,100 25,000 51,000
600 363 759 1,430 2,930 4,400 8,460 13,500 23,900 48,600
650 347 726 1,370 2,810 4,210 8,110 12,900 22,800 46,600
700 334 698 1,310 2,700 4,040 7,790 12,400 21,900 44,800
750 321 672 1,270 2,600 3,900 7,500 12,000 21,100 43,100
800 310 649 1,220 2,510 3,760 7,240 11,500 20,400 41,600
850 300 628 1,180 2,430 3,640 7,010 7,010 19,800 40,300
900 291 609 1,150 2,360 3,530 6,800 10,800 19,200 39,100
950 283 592 1,110 2,290 3,430 6,600 10,500 18,600 37,900
1,000 275 575 1,080 2,230 3,330 6,420 10,200 18,100 36,900
1,100 261 546 1,030 2,110 3,170 6,100 9,720 17,200 35,000
1,200 249 521 982 2,020 3,020 5,820 9,270 16,400 33,400
1,300 239 499 940 1,930 2,890 5,570 8,880 15,700 32,000
1,400 229 480 903 1,850 2,780 5,350 8,530 15,100 30,800
1,500 221 462 462 1,790 2,680 5,160 8,220 14,500 29,600
1,600 213 446 840 1,730 2,590 4,980 4,980 4,980 28,600
1,700 206 432 813 1,670 2,500 4,820 7,680 13,600 27,700
1,800 200 419 789 1,620 2,430 4,670 7,450 13,200 26,900
1,900 194 407 766 1,570 2,360 4,540 7,230 12,800 26,100
2,000 189 395 745 1,530 2,290 4,410 7,030 12,400 25,400
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.


TABLE C402.4(26)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 10.0 psi
Pressure Drop 3.0 psi
Specific Gravity 1.50
INTENDED USE Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 5,890 12,300 23,200 47,600 71,300 137,000 219,000 387,000 789,000
20 4,050 8,460 15,900 32,700 49,000 94,400 150,000 266,000 543,000
30 3,250 6,790 12,800 26,300 39,400 75,800 121,000 214,000 436,000
40 2,780 5,810 11,000 22,500 33,700 64,900 103,000 183,000 373,000
50 2,460 5,150 9,710 19,900 29,900 57,500 91,600 162,000 330,000
60 2,230 4,670 8,790 18,100 27,100 52,100 83,000 147,000 299,000
70 2,050 4,300 8,090 16,600 24,900 47,900 76,400 135,000 275,000
80 1,910 4,000 7,530 15,500 23,200 44,600 71,100 126,000 256,000
90 1,790 3,750 7,060 14,500 21,700 41,800 66,700 118,000 240,000
100 1,690 3,540 6,670 13,700 20,500 39,500 63,000 111,000 227,000
125 1,500 3,140 5,910 12,100 18,200 35,000 55,800 98,700 201,000
150 1,360 2,840 5,360 11,000 16,500 31,700 50,600 89,400 182,000
175 1,250 2,620 4,930 10,100 15,200 29,200 46,500 82,300 167,800
200 1,160 2,430 4,580 9,410 14,100 27,200 43,300 76,500 156,100
250 1,030 2,160 4,060 8,340 12,500 24,100 38,400 67,800 138,400
300 935 1,950 3,680 7,560 11,300 21,800 34,800 61,500 125,400
350 860 1,800 3,390 6,950 10,400 20,100 32,000 56,500 115,300
400 800 1,670 3,150 6,470 9,690 18,700 29,800 52,600 107,300
450 751 1,570 2,960 6,070 9,090 17,500 27,900 49,400 100,700
500 709 1,480 2,790 5,730 8,590 16,500 26,400 46,600 95,100
550 673 1,410 2,650 5,450 8,160 15,700 25,000 44,300 90,300
600 642 1,340 2,530 5,200 7,780 15,000 23,900 42,200 86,200
650 615 1,290 2,420 4,980 7,450 14,400 22,900 40,500 82,500
700 591 1,240 2,330 4,780 7,160 13,800 22,000 38,900 79,300
750 569 1,190 2,240 4,600 6,900 13,300 21,200 37,400 76,400
800 550 1,150 2,170 4,450 6,660 12,800 20,500 36,200 73,700
850 532 1,110 2,100 4,300 6,450 12,400 19,800 35,000 71,400
900 516 1,080 2,030 4,170 6,250 12,000 19,200 33,900 69,200
950 501 1,050 1,970 4,050 6,070 11,700 18,600 32,900 67,200
1,000 487 1,020 1,920 3,940 5,900 11,400 18,100 32,000 65,400
1,100 463 968 1,820 3,740 5,610 10,800 17,200 30,400 62,100
1,200 442 923 1,740 3,570 5,350 10,300 16,400 29,000 59,200
1,300 423 884 1,670 3,420 5,120 9,870 15,700 27,800 56,700
1,400 406 849 1,600 3,280 4,920 9,480 15,100 26,700 54,500
1,500 391 818 1,540 3,160 4,740 9,130 14,600 25,700 52,500
1,600 378 790 1,490 3,060 4,580 8,820 14,100 24,800 50,700
1,700 366 765 1,440 2,960 4,430 8,530 13,600 24,000 49,000
1,800 355 741 1,400 2,870 4,300 8,270 13,200 23,300 47,600
1,900 344 720 1,360 2,780 4,170 8,040 12,800 22,600 46,200
2,000 335 700 1,320 2,710 4,060 7,820 12,500 22,000 44,900
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.


TABLE C402.4(27)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Pipe sizing between 2 psig service and line pressure regulator.
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 2,680 5,590 10,500 21,600 32,400 62,400 99,500 176,000 359,000
20 1,840 3,850 7,240 14,900 22,300 42,900 68,400 121,000 247,000
30 1,480 3,090 5,820 11,900 17,900 34,500 54,900 97,100 198,000
40 1,260 2,640 4,980 10,200 15,300 29,500 47,000 83,100 170,000
50 1,120 2,340 4,410 9,060 13,600 26,100 41,700 73,700 150,000
60 1,010 2,120 4,000 8,210 12,300 23,700 37,700 66,700 136,000
70 934 1,950 3,680 7,550 11,300 21,800 34,700 61,400 125,000
80 869 1,820 3,420 7,020 10,500 20,300 32,300 57,100 116,000
90 815 1,700 3,210 6,590 9,880 19,000 30,300 53,600 109,000
100 770 1,610 3,030 6,230 9,330 18,000 28,600 50,600 103,000
125 682 1,430 2,690 5,520 8,270 15,900 25,400 44,900 91,500
150 618 1,290 2,440 5,000 7,490 14,400 23,000 40,700 82,900
175 569 1,190 2,240 4,600 6,890 13,300 21,200 37,400 76,300
200 529 1,110 2,080 4,280 6,410 12,300 19,700 34,800 71,000
250 469 981 1,850 3,790 5,680 10,900 17,400 30,800 62,900
300 425 889 1,670 3,440 5,150 9,920 15,800 27,900 57,000
350 391 817 1,540 3,160 4,740 9,120 14,500 25,700 52,400
400 364 760 1,430 2,940 4,410 8,490 13,500 23,900 48,800
450 341 714 1,340 2,760 4,130 7,960 12,700 22,400 45,800
500 322 674 1,270 2,610 3,910 7,520 12,000 21,200 43,200
550 306 640 1,210 2,480 3,710 7,140 11,400 20,100 41,100
600 292 611 1,150 2,360 3,540 6,820 10,900 19,200 39,200
650 280 585 1,100 2,260 3,390 6,530 10,400 18,400 37,500
700 269 562 1,060 2,170 3,260 6,270 9,990 17,700 36,000
750 259 541 1,020 2,090 3,140 6,040 9,630 17,000 34,700
800 250 523 985 2,020 3,030 5,830 9,300 16,400 33,500
850 242 506 953 1,960 2,930 5,640 9,000 15,900 32,400
900 235 490 924 1,900 2,840 5,470 8,720 15,400 31,500
950 228 476 897 1,840 2,760 5,310 8,470 15,000 30,500
1,000 222 463 873 1,790 2,680 5,170 8,240 14,600 29,700
1,100 210 440 829 1,700 2,550 4,910 7,830 13,800 28,200
1,200 201 420 791 1,620 2,430 4,680 7,470 13,200 26,900
1,300 192 402 757 1,550 2,330 4,490 7,150 12,600 25,800
1,400 185 386 727 1,490 2,240 4,310 6,870 12,100 24,800
1,500 178 372 701 1,440 2,160 4,150 6,620 11,700 23,900
1,600 172 359 677 1,390 2,080 4,010 6,390 11,300 23,000
1,700 166 348 655 1,340 2,010 3,880 6,180 10,900 22,300
1,800 161 337 635 1,300 1,950 3,760 6,000 10,600 21,600
1,900 157 327 617 1,270 1,900 3,650 5,820 10,300 21,000
2,000 152 318 600 1,230 1,840 3,550 5,660 10,000 20,400
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.


TABLE C402.4(28)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 11.0 in. w.c.
Pressure Drop 0.5 in. w.c.
Specific Gravity 1.50
INTENDED USE Pipe sizing between single- or second-stage (low pressure) regulator and appliance.
PIPE SIZE (inch)
Nominal 1/2 3/4 1 11/4 11/2 2 21/2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 291 608 1,150 2,350 3,520 6,790 10,800 19,100 39,000
20 200 418 787 1,620 2,420 4,660 7,430 13,100 26,800
30 160 336 632 1,300 1,940 3,750 5,970 10,600 21,500
40 137 287 541 1,110 1,660 3,210 5,110 9,030 18,400
50 122 255 480 985 1,480 2,840 4,530 8,000 16,300
60 110 231 434 892 1,340 2,570 4,100 7,250 14,800
80 101 212 400 821 1,230 2,370 3,770 6,670 13,600
100 94 197 372 763 1,140 2,200 3,510 6,210 12,700
125 89 185 349 716 1,070 2,070 3,290 5,820 11,900
150 84 175 330 677 1,010 1,950 3,110 5,500 11,200
175 74 155 292 600 899 1,730 2,760 4,880 9,950
200 67 140 265 543 814 1,570 2,500 4,420 9,010
250 62 129 243 500 749 1,440 2,300 4,060 8,290
300 58 120 227 465 697 1,340 2,140 3,780 7,710
350 51 107 201 412 618 1,190 1,900 3,350 6,840
400 46 97 182 373 560 1,080 1,720 3,040 6,190
450 42 89 167 344 515 991 1,580 2,790 5,700
500 40 83 156 320 479 922 1,470 2,600 5,300
550 37 78 146 300 449 865 1,380 2,440 4,970
600 35 73 138 283 424 817 1,300 2,300 4,700
650 33 70 131 269 403 776 1,240 2,190 4,460
700 32 66 125 257 385 741 1,180 2,090 4,260
750 30 64 120 246 368 709 1,130 2,000 4,080
800 29 61 115 236 354 681 1,090 1,920 3,920
850 28 59 111 227 341 656 1,050 1,850 3,770
900 27 57 107 220 329 634 1,010 1,790 3,640
950 26 55 104 213 319 613 978 1,730 3,530
1,000 25 53 100 206 309 595 948 1,680 3,420
1,100 25 52 97 200 300 578 921 1,630 3,320
1,200 24 50 95 195 292 562 895 1,580 3,230
1,300 23 48 90 185 277 534 850 1,500 3,070
1,400 22 46 86 176 264 509 811 1,430 2,930
1,500 21 44 82 169 253 487 777 1,370 2,800
1,600 20 42 79 162 243 468 746 1,320 2,690
1,700 19 40 76 156 234 451 719 1,270 2,590
1,800 19 39 74 151 226 436 694 1,230 2,500
1,900 18 38 71 146 219 422 672 1,190 2,420
2,000 18 37 69 142 212 409 652 1,150 2,350
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.


TABLE C402.4(29)
SEMIRIGID COPPER TUBING
  Gas Undiluted Propane
Inlet Pressure 10.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
TUBE SIZE (in.)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Thousands of Btu per Hour
10 513 1,060 2,150 3,760 5,330 11,400 20,500 32,300 67,400
20 352 727 1,480 2,580 3,670 7,830 14,100 22,200 46,300
30 283 584 1,190 2,080 2,940 6,290 11,300 17,900 37,200
40 242 500 1,020 1,780 2,520 5,380 9,690 15,300 31,800
50 215 443 901 1,570 2,230 4,770 8,590 13,500 28,200
60 194 401 816 1,430 2,020 4,320 7,780 12,300 25,600
70 179 369 751 1,310 1,860 3,980 7,160 11,300 23,500
80 166 343 699 1,220 1,730 3,700 6,660 10,500 21,900
90 156 322 655 1,150 1,630 3,470 6,250 9,850 20,500
100 147 304 619 1,080 1,540 3,280 5,900 9,310 19,400
125 131 270 549 959 1,360 2,910 5,230 8,250 17,200
150 118 244 497 869 1,230 2,630 4,740 7,470 15,600
175 109 225 457 799 1,130 2,420 4,360 6,880 14,300
200 101 209 426 744 1,060 2,250 4,060 6,400 13,300
250 90 185 377 659 935 2,000 3,600 5,670 11,800
300 81 168 342 597 847 1,810 3,260 5,140 10,700
350 75 155 314 549 779 1,660 3,000 4,730 9,840
400 70 144 292 511 725 1,550 2,790 4,400 9,160
450 65 135 274 480 680 1,450 2,620 4,130 8,590
500 62 127 259 453 643 1,370 2,470 3,900 8,120
550 59 121 246 430 610 1,300 2,350 3,700 7,710
600 56 115 235 410 582 1,240 2,240 3,530 7,350
650 54 111 225 393 558 1,190 2,140 3,380 7,040
700 51 106 216 378 536 1,140 2,060 3,250 6,770
750 50 102 208 364 516 1,100 1,980 3,130 6,520
800 48 99 201 351 498 1,060 1,920 3,020 6,290
850 46 96 195 340 482 1,030 1,850 2,920 6,090
900 45 93 189 330 468 1,000 1,800 2,840 5,910
950 44 90 183 320 454 970 1,750 2,750 5,730
1,000 42 88 178 311 442 944 1,700 2,680 5,580
1,100 40 83 169 296 420 896 1,610 2,540 5,300
1,200 38 79 161 282 400 855 1,540 2,430 5,050
1,300 37 76 155 270 383 819 1,470 2,320 4,840
1,400 35 73 148 260 368 787 1,420 2,230 4,650
1,500 34 70 143 250 355 758 1,360 2,150 4,480
1,600 33 68 138 241 343 732 1,320 2,080 4,330
1,700 32 66 134 234 331 708 1,270 2,010 4,190
1,800 31 64 130 227 321 687 1,240 1,950 4,060
1,900 30 62 126 220 312 667 1,200 1,890 3,940
2,000 29 60 122 214 304 648 1,170 1,840 3,830
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
TABLE C402.4(30)
SEMIRIGID COPPER TUBING
  Gas Undiluted Propane
Inlet Pressure 11.0 in. w.c.
Pressure Drop 0.5 in. w.c.
Specific Gravity 1.50
INTENDED USE Sizing between single or second stage (low-pressure regulator) and appliance.
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Thousands of Btu per Hour
10 45 93 188 329 467 997 1,800 2,830 5,890
20 31 64 129 226 321 685 1,230 1,950 4,050
30 25 51 104 182 258 550 991 1,560 3,250
40 21 44 89 155 220 471 848 1,340 2,780
50 19 39 79 138 195 417 752 1,180 2,470
60 17 35 71 125 177 378 681 1,070 2,240
70 16 32 66 115 163 348 626 988 2,060
80 15 30 61 107 152 324 583 919 1,910
90 14 28 57 100 142 304 547 862 1,800
100 13 27 54 95 134 287 517 814 1,700
125 11 24 48 84 119 254 458 722 1,500
150 10 21 44 76 108 230 415 654 1,360
175 NA 20 40 70 99 212 382 602 1,250
200 NA 18 37 65 92 197 355 560 1,170
250 NA 16 33 58 82 175 315 496 1,030
300 NA 15 30 52 74 158 285 449 936
350 NA 14 28 48 68 146 262 414 861
400 NA 13 26 45 63 136 244 385 801
450 NA 12 24 42 60 127 229 361 752
500 NA 11 23 40 56 120 216 341 710
550 NA 11 22 38 53 114 205 324 674
600 NA 10 21 36 51 109 196 309 643
650 NA NA 20 34 49 104 188 296 616
700 NA NA 19 33 47 100 180 284 592
750 NA NA 18 32 45 96 174 274 570
800 NA NA 18 31 44 93 168 264 551
850 NA NA 17 30 42 90 162 256 533
900 NA NA 17 29 41 87 157 248 517
950 NA NA 16 28 40 85 153 241 502
1,000 NA NA 16 27 39 83 149 234 488
1,100 NA NA 15 26 37 78 141 223 464
1,200 NA NA 14 25 35 75 135 212 442
1,300 NA NA 14 24 34 72 129 203 423
1,400 NA NA 13 23 32 69 124 195 407
1,500 NA NA 13 22 31 66 119 188 392
1,600 NA NA 12 21 30 64 115 182 378
1,700 NA NA 12 20 29 62 112 176 366
1,800 NA NA 11 20 28 60 108 170 355
1,900 NA NA 11 19 27 58 105 166 345
2,000 NA NA 11 19 27 57 102 161 335
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10,000 Btu/hr.
  3. All table entries have been rounded to three significant digits.
TABLE C402.4(31)
SEMIRIGID COPPER TUBING
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Tube sizing between 2 psig service and line pressure regulator.
TUBE SIZE (inch)
Nominal K & L 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR 3/8 1/2 5/8 3/4 7/8 11/8 13/8
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Thousands of Btu per Hour
10 413 852 1,730 3,030 4,300 9,170 16,500 26,000 54,200
20 284 585 1,190 2,080 2,950 6,310 11,400 17,900 37,300
30 228 470 956 1,670 2,370 5,060 9,120 14,400 29,900
40 195 402 818 1,430 2,030 4,330 7,800 12,300 25,600
50 173 356 725 1,270 1,800 3,840 6,920 10,900 22,700
60 157 323 657 1,150 1,630 3,480 6,270 9,880 20,600
70 144 297 605 1,060 1,500 3,200 5,760 9,090 18,900
80 134 276 562 983 1,390 2,980 5,360 8,450 17,600
90 126 259 528 922 1,310 2,790 5,030 7,930 16,500
100 119 245 498 871 1,240 2,640 4,750 7,490 15,600
125 105 217 442 772 1,100 2,340 4,210 6,640 13,800
150 95 197 400 700 992 2,120 3,820 6,020 12,500
175 88 181 368 644 913 1,950 3,510 5,540 11,500
200 82 168 343 599 849 1,810 3,270 5,150 10,700
250 72 149 304 531 753 1,610 2,900 4,560 9,510
300 66 135 275 481 682 1,460 2,620 4,140 8,610
350 60 124 253 442 628 1,340 2,410 3,800 7,920
400 56 116 235 411 584 1,250 2,250 3,540 7,370
450 53 109 221 386 548 1,170 2,110 3,320 6,920
500 50 103 209 365 517 1,110 1,990 3,140 6,530
550 47 97 198 346 491 1,050 1,890 2,980 6,210
600 45 93 189 330 469 1,000 1,800 2,840 5,920
650 43 89 181 316 449 959 1,730 2,720 5,670
700 41 86 174 304 431 921 1,660 2,620 5,450
750 40 82 168 293 415 888 1,600 2,520 5,250
800 39 80 162 283 401 857 1,540 2,430 5,070
850 37 77 157 274 388 829 1,490 2,350 4,900
900 36 75 152 265 376 804 1,450 2,280 4,750
950 35 72 147 258 366 781 1,410 2,220 4,620
1,000 34 71 143 251 356 760 1,370 2,160 4,490
1,100 32 67 136 238 338 721 1,300 2,050 4,270
1,200 31 64 130 227 322 688 1,240 1,950 4,070
1,300 30 61 124 217 309 659 1,190 1,870 3,900
1,400 28 59 120 209 296 633 1,140 1,800 3,740
1,500 27 57 115 201 286 610 1,100 1,730 3,610
1,600 26 55 111 194 276 589 1,060 1,670 3,480
1,700 26 53 108 188 267 570 1,030 1,620 3,370
1,800 25 51 104 182 259 553 1,000 1,570 3,270
1,900 24 50 101 177 251 537 966 1,520 3,170
2,000 23 48 99 172 244 522 940 1,480 3,090
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.


TABLE C402.4(32)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Undiluted Propane
Inlet Pressure 11.0 in. w.c.
Pressure Drop 0.5 in. w.c.
Specific Gravity 1.50
INTENDED USE: SIZING BETWEEN SINGLE OR SECOND STAGE (Low Pressure) REGULATOR AND THE APPLIANCE SHUTOFF VALVE
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Thousands of Btu per Hour
5 72 99 181 211 355 426 744 863 1,420 1,638 2,830 3,270 5,780 6,550
10 50 69 129 150 254 303 521 605 971 1,179 1,990 2,320 4,110 4,640
15 39 55 104 121 208 248 422 490 775 972 1,620 1,900 3,370 3,790
20 34 49 91 106 183 216 365 425 661 847 1,400 1,650 2,930 3,290
25 30 42 82 94 164 192 325 379 583 762 1,250 1,480 2,630 2,940
30 28 39 74 87 151 177 297 344 528 698 1,140 1,350 2,400 2,680
40 23 33 64 74 131 153 256 297 449 610 988 1,170 2,090 2,330
50 20 30 58 66 118 137 227 265 397 548 884 1,050 1,870 2,080
60 19 26 53 60 107 126 207 241 359 502 805 961 1,710 1,900
70 17 25 49 57 99 117 191 222 330 466 745 890 1,590 1,760
80 15 23 45 52 94 109 178 208 307 438 696 833 1,490 1,650
90 15 22 44 50 90 102 169 197 286 414 656 787 1,400 1,550
100 14 20 41 47 85 98 159 186 270 393 621 746 1,330 1,480
150 11 15 31 36 66 75 123 143 217 324 506 611 1,090 1,210
200 9 14 28 33 60 69 112 129 183 283 438 531 948 1,050
250 8 12 25 30 53 61 99 117 163 254 390 476 850 934
300 8 11 23 26 50 57 90 107 147 234 357 434 777 854
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.


TABLE C402.4(33)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE: SIZING BETWEEN 2 PSI SERVICE AND THE LINE PRESSURE REGULATOR
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Thousands of Btu per Hour
10 426 558 927 1,110 1,740 2,170 4,100 4,720 7,130 7,958 15,200 16,800 29,400 34,200
25 262 347 591 701 1,120 1,380 2,560 2,950 4,560 5,147 9,550 10,700 18,800 21,700
30 238 316 540 640 1,030 1,270 2,330 2,690 4,180 4,719 8,710 9,790 17,200 19,800
40 203 271 469 554 896 1,100 2,010 2,320 3,630 4,116 7,530 8,500 14,900 17,200
50 181 243 420 496 806 986 1,790 2,070 3,260 3,702 6,730 7,610 13,400 15,400
75 147 196 344 406 663 809 1,460 1,690 2,680 3,053 5,480 6,230 11,000 12,600
80 140 189 333 393 643 768 1,410 1,630 2,590 2,961 5,300 6,040 10,600 12,200
100 124 169 298 350 578 703 1,260 1,450 2,330 2,662 4,740 5,410 9,530 10,900
150 101 137 245 287 477 575 1,020 1,180 1,910 2,195 3,860 4,430 7,810 8,890
200 86 118 213 248 415 501 880 1,020 1,660 1,915 3,340 3,840 6,780 7,710
250 77 105 191 222 373 448 785 910 1,490 1,722 2,980 3,440 6,080 6,900
300 69 96 173 203 343 411 716 829 1,360 1,578 2,720 3,150 5,560 6,300
400 60 82 151 175 298 355 616 716 1,160 1,376 2,350 2,730 4,830 5,460
500 53 72 135 158 268 319 550 638 1,030 1,237 2,100 2,450 4,330 4,880
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 1/2 psi (based on 13 in. w.c. outlet pressure), DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.


TABLE C402.4(34)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Undiluted Propane
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 1.50
TUBE SIZE (EHD)
Flow
Designation
13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Thousands of Btu per Hour
10 826 1,070 1,710 2,060 3,150 4,000 7,830 8,950 13,100 14,441 28,600 31,200 54,400 63,800
25 509 664 1,090 1,310 2,040 2,550 4,860 5,600 8,400 9,339 18,000 19,900 34,700 40,400
30 461 603 999 1,190 1,870 2,340 4,430 5,100 7,680 8,564 16,400 18,200 31,700 36,900
40 396 520 867 1,030 1,630 2,030 3,820 4,400 6,680 7,469 14,200 15,800 27,600 32,000
50 352 463 777 926 1,460 1,820 3,410 3,930 5,990 6,717 12,700 14,100 24,700 28,600
75 284 376 637 757 1,210 1,490 2,770 3,190 4,920 5,539 10,300 11,600 20,300 23,400
80 275 363 618 731 1,170 1,450 2,680 3,090 4,770 5,372 9,990 11,200 19,600 22,700
100 243 324 553 656 1,050 1,300 2,390 2,760 4,280 4,830 8,930 10,000 17,600 20,300
150 196 262 453 535 866 1,060 1,940 2,240 3,510 3,983 7,270 8,210 14,400 16,600
200 169 226 393 464 755 923 1,680 1,930 3,050 3,474 6,290 7,130 12,500 14,400
250 150 202 352 415 679 828 1,490 1,730 2,740 3,124 5,620 6,390 11,200 12,900
300 136 183 322 379 622 757 1,360 1,570 2,510 2,865 5,120 5,840 10,300 11,700
400 117 158 279 328 542 657 1,170 1,360 2,180 2,498 4,430 5,070 8,920 10,200
500 104 140 251 294 488 589 1,050 1,210 1,950 2,247 3,960 4,540 8,000 9,110
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
          1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds1 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drop across regulator may vary with the flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity of selected regulator. Consult with the tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
TABLE C402.4(35)
POLYETHYLENE PLASTIC PIPE
  Gas Undiluted Propane
Inlet Pressure 11.0 in. w.c.
Pressure Drop 0.5 in. w.c.
Specific Gravity 1.50
INTENDED USE PE pipe sizing between integral two-stage regulator at tank or second stage (low-pressure regulator) and building.
PIPE SIZE (inch)
Nominal OD 1/2 3/4 1 11/4 11/2 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Thousands of Btu per Hour
10 340 680 1,230 2,130 3,210 5,770 16,000 30,900
20 233 468 844 1,460 2,210 3,970 11,000 21,200
30 187 375 677 1,170 1,770 3,180 8,810 17,000
40 160 321 580 1,000 1,520 2,730 7,540 14,600
50 142 285 514 890 1,340 2,420 6,680 12,900
60 129 258 466 807 1,220 2,190 6,050 11,700
70 119 237 428 742 1,120 2,010 5,570 10,800
80 110 221 398 690 1,040 1,870 5,180 10,000
90 103 207 374 648 978 1,760 4,860 9,400
100 98 196 353 612 924 1,660 4,590 8,900
125 87 173 313 542 819 1,470 4,070 7,900
150 78 157 284 491 742 1,330 3,690 7,130
175 72 145 261 452 683 1,230 3,390 6,560
200 67 135 243 420 635 1,140 3,160 6,100
250 60 119 215 373 563 1,010 2,800 5,410
300 54 108 195 338 510 916 2,530 4,900
350 50 99 179 311 469 843 2,330 4,510
400 46 92 167 289 436 784 2,170 4,190
450 43 87 157 271 409 736 2,040 3,930
500 41 82 148 256 387 695 1,920 3,720
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
           1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.


TABLE C402.4(36)
POLYETHYLENE PLASTIC PIPE
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE PE pipe sizing between 2 psig service regulator and line pressure regulator.
PIPE SIZE (inch)
Nominal OD 1/2 3/4 1 11/4 11/2 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Thousands of Btu per Hour
10 3,130 6,260 11,300 19,600 29,500 53,100 147,000 284,000
20 2,150 4,300 7,760 13,400 20,300 36,500 101,000 195,000
30 1,730 3,450 6,230 10,800 16,300 29,300 81,100 157,000
40 1,480 2,960 5,330 9,240 14,000 25,100 69,400 134,100
50 1,310 2,620 4,730 8,190 12,400 22,200 61,500 119,000
60 1,190 2,370 4,280 7,420 11,200 20,100 55,700 108,000
70 1,090 2,180 3,940 6,830 10,300 18,500 51,300 99,100
80 1,010 2,030 3,670 6,350 9,590 17,200 47,700 92,200
90 952 1,910 3,440 5,960 9,000 16,200 44,700 86,500
100 899 1,800 3,250 5,630 8,500 15,300 42,300 81,700
125 797 1,600 2,880 4,990 7,530 13,500 37,500 72,400
150 722 1,450 2,610 4,520 6,830 12,300 33,900 65,600
175 664 1,330 2,400 4,160 6,280 11,300 31,200 60,300
200 618 1,240 2,230 3,870 5,840 10,500 29,000 56,100
250 548 1,100 1,980 3,430 5,180 9,300 25,700 49,800
300 496 994 1,790 3,110 4,690 8,430 23,300 45,100
350 457 914 1,650 2,860 4,320 7,760 21,500 41,500
400 425 851 1,530 2,660 4,020 7,220 12,000 38,600
450 399 798 1,440 2,500 3,770 6,770 18,700 36,200
500 377 754 1,360 2,360 3,560 6,390 17,700 34,200
550 358 716 1,290 2,240 3,380 6,070 16,800 32,500
600 341 683 1,230 2,140 3,220 5,790 16,000 31,000
650 327 654 1,180 2,040 3,090 5,550 15,400 29,700
700 314 628 1,130 1,960 2,970 5,330 14,700 28,500
750 302 605 1,090 1,890 2,860 5,140 14,200 27,500
800 292 585 1,050 1,830 2,760 4,960 13,700 26,500
850 283 566 1,020 1,770 2,670 4,800 13,300 25,700
900 274 549 990 1,710 2,590 4,650 12,900 24,900
950 266 533 961 1,670 2,520 4,520 12,500 24,200
1,000 259 518 935 1,620 2,450 4,400 12,200 23,500
1,100 246 492 888 1,540 2,320 4,170 11,500 22,300
1,200 234 470 847 1,470 2,220 3,980 11,000 21,300
1,300 225 450 811 1,410 2,120 3,810 10,600 20,400
1,400 216 432 779 1,350 2,040 3,660 10,100 19,600
1,500 208 416 751 1,300 1,960 3,530 9,760 18,900
1,600 201 402 725 1,260 1,900 3,410 9,430 18,200
1,700 194 389 702 1,220 1,840 3,300 9,130 17,600
1,800 188 377 680 1,180 1,780 3,200 8,850 17,100
1,900 183 366 661 1,140 1,730 3,110 8,590 16,600
2,000 178 356 643 1,110 1,680 3,020 8,360 16,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.


TABLE C402.4(37)
POLYETHYLENE PLASTIC TUBING
  Gas Undiluted Propane
Inlet Pressure 11.0 in. w.c.
Pressure Drop 0.5 in. w.c.
Specific Gravity 1.50
INTENDED USE PE pipe sizing between integral two-stage regulator at tank or second stage (low-pressure regulator) and building.
Plastic Tubing Size (CTS) (inch)
Nominal OD 1/2 1
Designation SDR 7 SDR 11
Actual ID 0.445 0.927
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 121 828
20 83 569
30 67 457
40 57 391
50 51 347
60 46 314
70 42 289
80 39 269
90 37 252
100 35 238
125 31 211
150 28 191
175 26 176
200 24 164
225 22 154
250 21 145
275 20 138
300 19 132
350 18 121
400 16 113
450 15 106
500 15 100
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,
1 pound per square inch = 6.895 kPa,
1-inch water column = 0.2488 kPa,
1 British thermal unit per hour = 0.2931 W,
1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: All table entries have been rounded to three significant digits.

C402.4.1 Longest Length Method

AMENDMENT
This section has been amended at the state or city level.
The pipe size of each section of gas piping shall be determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section.

C402.4.2 Branch Length Method

AMENDMENT
This section has been amended at the state or city level.
shall be sized as follows:
  1. Pipe size of each section of the longest pipe run from the point of delivery to the most remote outlet shall be determined using the longest run of piping and the load of the section.
  2. The pipe size of each section of branch piping not previously sized shall be determined using the length of piping from the point of delivery to the most remote outlet in each branch and the load of the section.

C402.4.3 Hybrid Pressure

AMENDMENT
This section has been amended at the state or city level.
The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The pipe size from the line pressure regulator to each outlet shall be determined using the length of piping from the regulator to the most remote outlet served by the regulator.

C402.5 Allowable Pressure Drop

AMENDMENT
This section has been amended at the state or city level.
The design pressure loss in any piping system under maximum probable flow conditions, from the point of delivery to the inlet connection of the appliance, shall be such that the supply pressure at the appliance is greater than or equal to the minimum pressure required by the appliance.

C402.6 Maximum Design Operating Pressure

AMENDMENT
This section has been amended at the state or city level.
The maximum design operating pressure for piping systems located inside buildings shall not exceed 5 pounds per square inch gauge (psig) (34 kPa gauge) except where one or more of the following conditions are met:
  1. The piping system is welded.
  2. The piping is located in a ventilated chase or otherwise enclosed for protection against accidental gas accumulation.
  3. The piping is located inside buildings or separate areas of buildings used exclusively for:
    1. Industrial processing or heating;
    2. Research;
    3. Warehousing; or
    4. Boiler or mechanical rooms.
  4. The piping is a temporary installation for buildings under construction.
  5. The piping serves appliances or equipment used for agricultural purposes.
  6. The piping system is an LP-gas piping system with a design operating pressure greater than 20 psi (137.9 kPa) and complies with NFPA 58.

C402.6.1 Liquefied Petroleum Gas Systems

AMENDMENT
This section has been amended at the state or city level.
LP-gas systems designed to operate below -5°F (-21°C) or with butane or a propane-butane mix shall be designed to either accommodate liquid LP-gas or prevent LP-gas vapor from condensing into a liquid.

Section C403 Piping Materials

AMENDMENT
This section has been amended at the state or city level.

C403.1 General

AMENDMENT
This section has been amended at the state or city level.
Materials used for piping systems shall comply with the requirements of this chapter or shall be approved.

C403.2 Used Materials

AMENDMENT
This section has been amended at the state or city level.
Pipe, fittings, valves and other materials shall not be used again except where they are free of foreign materials and have been ascertained to be adequate for the service intended.

C403.3 Metallic Pipe

AMENDMENT
This section has been amended at the state or city level.
Metallic pipe shall comply with Sections C403.4.1 through C403.4.4.

C403.3.1 Cast Iron

AMENDMENT
This section has been amended at the state or city level.
Cast-iron pipe shall not be used.

C403.3.2 Steel

AMENDMENT
This section has been amended at the state or city level.
Steel and wrought-iron pipe shall be at least of standard weight (Schedule 40) and shall comply with one of the following standards:
  1. ASME B36.10, 10M;
  2. ASTM A 53/A 53M; or
  3. ASTM A 106.

C403.3.3 Copper and Brass

AMENDMENT
This section has been amended at the state or city level.
Copper and brass pipe shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet of gas (0.7 milligrams per 100 liters). Threaded copper, brass and aluminum-alloy pipe shall not be used with gases corrosive to such materials.

C403.3.4 Aluminum

AMENDMENT
This section has been amended at the state or city level.
Aluminum-alloy pipe shall comply with ASTM B 241 (except that the use of alloy 5456 is prohibited), and shall be marked at each end of each length indicating compliance. Aluminum-alloy pipe shall be coated to protect against external corrosion where it is in contact with masonry, plaster or insulation, or is subject to repeated wettings by such liquids as water, detergents or sewage. Aluminum-alloy pipe shall not be used in exterior locations or underground.

C403.4 Metallic Tubing

AMENDMENT
This section has been amended at the state or city level.
Seamless copper, aluminum alloy and steel tubing shall not be used with gases corrosive to such materials.

C403.4.1 Steel Tubing

AMENDMENT
This section has been amended at the state or city level.
Steel tubing shall comply with ASTM A 254.

C403.4.2 Copper and Brass Tubing

AMENDMENT
This section has been amended at the state or city level.
Copper tubing shall comply with Standard Type K or L of ASTM B 88 or ASTM B 280.

     Copper and brass tubing shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet of gas (0.7 milligrams per 100 liters).

C403.4.3 Aluminum Tubing

AMENDMENT
This section has been amended at the state or city level.
Aluminum-alloy tubing shall comply with ASTM B 210 or ASTM B 241. Aluminum- alloy tubing shall be coated to protect against external corrosion where it is in contact with masonry, plaster or insulation, or is subject to repeated wettings by such liquids as water, detergent or sewage.

     Aluminum-alloy tubing shall not be used in exterior locations or underground.

C403.4.4 Corrugated Stainless Steel Tubing

AMENDMENT
This section has been amended at the state or city level.
Corrugated stainless steel tubing shall be listed in accordance with ANSI LC 1/CSA 6.26.

C403.5 Plastic Pipe, Tubing and Fittings

AMENDMENT
This section has been amended at the state or city level.
Polyethylene plastic pipe, tubing and fittings used to supply fuel gas shall conform to the 2009 edition of ASTM D 2513. Such pipe shall be marked "Gas" and "ASTM D 2513."

     Plastic pipe, tubing and fittings, other than polyethylene, shall be identified and conform to the 2008 edition of ASTM D 2513. Such pipe shall be marked "Gas" and "ASTM D 2513."

C403.5.1 Anodeless Risers

AMENDMENT
This section has been amended at the state or city level.
Plastic pipe, tubing and anodeless risers shall comply with the following:
  1. Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak tested by the manufacturer in accordance with written procedures.
  2. Service head adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used, and shall be designed and certified to meet the requirements of Category I of the 2009 edition of ASTM D 2513, and U.S. Department of Transportation, Code of Federal Regulations, Title 49, Part 192.281(e). The manufacturer shall provide the user with qualified installation instructions as prescribed by the U.S. Department of Transportation, Code of Federal Regulations, Title 49, Part 192.283(b).

C403.5.2 LP-gas Systems

AMENDMENT
This section has been amended at the state or city level.
The use of plastic pipe, tubing and fittings in undiluted liquefied petroleum gas piping systems shall be in accordance with NFPA 58.

C403.5.3 Regulator Vent Piping

AMENDMENT
This section has been amended at the state or city level.
Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC conforming to ANSI/UL 651. PVC vent piping shall not be installed indoors.

C403.6 Workmanship and Defects

AMENDMENT
This section has been amended at the state or city level.
Pipe, tubing and fittings shall be clear and free from cutting burrs and defects in structure or threading, and shall be thoroughly brushed, and chip and scale blown.

     Defects in pipe, tubing and fittings shall not be repaired. Defective pipe, tubing and fittings shall be replaced.

C403.7 Protective Coating

AMENDMENT
This section has been amended at the state or city level.
Where in contact with material or atmosphere exerting a corrosive action, metallic piping and fittings coated with a corrosion-resistant material shall be used. External or internal coatings or linings used on piping or components shall not be considered as adding strength.

C403.8 Metallic Pipe Threads

AMENDMENT
This section has been amended at the state or city level.
Metallic pipe and fitting threads shall be taper pipe threads and shall comply with ASME B1.20.1.

C403.8.1 Damaged Threads

AMENDMENT
This section has been amended at the state or city level.
Pipe with threads that are stripped, chipped, corroded or otherwise damaged shall not be used. Where a weld opens during the operation of cutting or threading, that portion of the pipe shall not be used.

C403.8.2 Number of Threads

AMENDMENT
This section has been amended at the state or city level.
Field threading of metallic pipe shall be in accordance with Table C403.8.2.

TABLE C403.8.2
SPECIFICATIONS FOR THREADING METALLIC PIPE
IRON PIPE SIZE
(inches)
APPROXIMATE LENGTH
OF THREADED PORTION
(inches)
APPROXIMATE
NUMBER OF THREADS
TO BE CUT
1/2 3/4 10
3/4 3/4 10
1 1/4 10
11/4 1 11
11/2 1 11
2 1 11
21/2 11/2 12
3 11/2 12
4 15/8 13
For SI: 1 inch = 25.4 mm.