CODES

ADOPTS WITH AMENDMENTS:

International Residential Code 2009 (IRC 2009)

Copyright

Preface

Effective Use of the International Residential Code

Ordinance

Chapter 1 Scope and Administration

Chapter 2 Definitions

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Chapter 11 Energy Efficiency

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Fuel-Burning Equipment

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Systems

Chapter 24 Fuel Gas

Chapter 25 Plumbing Administration

Chapter 26 General Plumbing Requirements

Chapter 27 Plumbing Fixtures

Chapter 28 Water Heaters

Chapter 29 Water Supply and Distribution

Chapter 30 Sanitary Drainage

Chapter 31 Vents

Chapter 32 Traps

Chapter 33 Storm Drainage

Chapter 34 General Requirements

Chapter 35 Electrical Definitions

Chapter 36 Services

Chapter 37 Branch Circuit and Feeder Requirements

Chapter 38 Wiring Methods

Chapter 39 Power and Lighting Distribution

Chapter 40 Devices and Luminaires

Chapter 41 Appliance Installation

Chapter 42 Swimming Pools

Chapter 43 Class 2 Remote-Control, Signaling and Power-Limited Circuits

Chapter 44 Referenced Standards

Appendix A Sizing and Capacities of Gas Piping

Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods, Category I Appliances, and Appliances Listed for Use With Type B Vents

Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems

Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation

Appendix E Manufactured Housing Used as Dwellings

Appendix F Radon Control Methods

Appendix G Swimming Pools, Spas and Hot Tubs

Appendix H Patio Covers

Appendix I Private Sewage Disposal

Appendix J Existing Buildings and Structures

Appendix K Sound Transmission

Appendix L Permit Fees

Appendix M Home Day Care - R-3 Occupancy

Appendix N Venting Methods

Appendix O Gray Water Recycling Systems

Appendix P Sizing of Water Piping System

Appendix Q ICC International Residential Code Electrical Provisions/National Electrical Code Crossreference

FUEL GAS

The text of this chapter is extracted from the 2009 edition of the International Fuel Gas Code and has been modified where necessary to conform to the scope of application of the International Residential Code for One- and Two-Family Dwellings. The section numbers appearing in parentheses after each section number are the section numbers of the corresponding text in the International Fuel Gas Code.

This chapter covers those fuel gas piping systems, fuel-gas appliances and related accessories, venting systems and combustion air configurations most commonly encountered in the construction of one- and two-family dwellings and structures regulated by this code.

Coverage of piping systems shall extend from the point of delivery to the outlet of the appliance shutoff valves (see definition of “Point of delivery”). Piping systems requirements shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance. Requirements for gas appliances and related accessories shall include installation, combustion and ventilation air and venting and connections to piping systems.

The omission from this chapter of any material or method of installation provided for in the International Fuel Gas Code shall not be construed as prohibiting the use of such material or method of installation. Fuel-gas piping systems, fuel-gas appliances and related accessories, venting systems and combustion air configurations not specifically covered in these chapters shall comply with the applicable provisions of the International Fuel Gas Code.

Gaseous hydrogen systems shall be regulated by Chapter 7 of the International Fuel Gas Code.

This chapter shall not apply to the following:

1. Liquified natural gas (LNG) installations.

2. Temporary LP-gas piping for buildings under construction or renovation that is not to become part of the permanent piping system.

3. Except as provided in Section G2412.1.1, gas piping, meters, gas pressure regulators, and other appurtenances used by the serving gas supplier in the distribution of gas, other than undiluted LP-gas.

4. Portable LP-gas appliances and equipment of all types that is not connected to a fixed fuel piping system.

5. Portable fuel cell appliances that are neither connected to a fixed piping system nor interconnected to a power grid.

6. Installation of hydrogen gas, LP-gas and compressed natural gas (CNG) systems on vehicles.

Unless otherwise expressly stated, the following words and terms shall, for the purposes of this chapter, have the meanings indicated in this chapter.
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.
Where terms are not defined in this code and are defined in the International Building Code, International Fire Code, International Mechanical Code or International Plumbing Code, such terms shall have meanings ascribed to them as in those codes.

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

AIR, EXHAUST. Air being removed from any space or piece of equipment or appliance and conveyed directly to the atmosphere by means of openings or ducts.

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.

ALTERATION. A change in a system that involves an extension, addition or change to the arrangement, type or purpose of the original installation.

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

APPLIANCE. Any apparatus or device that uses gas as a fuel or raw material to produce light, heat, power, refrigeration or air conditioning.

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

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.

APPROVED. Acceptable to the code official or other authority having jurisdiction.

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 (psia) (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.

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.

BOILER, LOW-PRESSURE. A self-contained gas-fired appliance for supplying steam or hot water.

Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 psig (1100 kPa gauge) and at water temperatures not exceeding 250°F (121°C) at or near the boiler outlet.

Hot water supply boiler. A boiler, completely filled with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig (1100 kPa gauge) and at water temperatures not exceeding 250°F (121°C) at or near the boiler outlet.

Steam heating boiler. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig (100 kPa gauge).

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.

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.

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.

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.

CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air.

Type 1. Factory-built package, multiple production. Primarily used in the family living environment. Usually the smallest unit physically and in function output.

CODE. These regulations, subsequent amendments thereto, or any emergency rule or regulation that the administrative authority having jurisdiction has lawfully adopted.

CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.

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.

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 the 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.

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

DECORATIVE GAS 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).

DESIGN FLOOD ELEVATION. The elevation of the “design flood,” including wave height, relative to the datum specified on the community’s legally designated flood hazard map.

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, backdraft, 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.

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.

DWELLING UNIT. A single unit providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.

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.

FIREPLACE. A fire chamber and hearth constructed of noncombustible material for use with solid fuels and provided with a chimney.

Masonry fireplace. A hearth and fire chamber of solid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney.

Factory-built fireplace. A fireplace composed of listed factory-built components assembled in accordance with the terms of listing to form the completed fireplace.

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.

FLOOD HAZARD AREA. The greater of the following two areas:

1. The area within a floodplain subject to a 1 percent or greater chance of flooding in any given year.

2. This area designated as a flood hazard area on a community’s flood hazard map, or otherwise legally designated.

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.

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.

FUEL GAS UTILIZATION EQUIPMENT. See “Appliance.”

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 FURNACE. 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.

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 gas 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.

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 International Building Code as a high-hazard use group classification.

HOUSE PIPING. See “Piping system.”

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

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.

INFRARED RADIANT HEATER. A heater which 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, 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 positive-holding mechanical construction, such as 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.

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

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.

LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing and sanitation purposes.

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

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.

OFFSET (VENT). A combination of approved bends that make two changes in direction bringing one section of the vent out of line, but into a line parallel with the other section.

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.

POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. For undiluted liquefied petroleum gas systems, the point of delivery shall be considered to be the outlet of the first regulator that reduces pressure to 2 psig (13.8 kPa) or less.

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.

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.”)

REGULATOR. A device for controlling and maintaining a uniform gas 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 gas appliance.

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. A device installed by the serving gas supplier to reduce and limit the service line gas pressure to delivery pressure.

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, backdraft or stoppage beyond the draft hood, and to permit air into the draft hood in the event of a strong chimney updraft.

RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum in the hot water supply system.

RELIEF VALVE, PRESSURE. An automatic valve which opens and closes a relief vent, depending on whether the pressure is above or below a predetermined value.

RELIEF VALVE, TEMPERATURE.

Manual reset type. A valve which automatically opens a relief vent at a predetermined temperature and which must be manually returned to the closed position.

Reseating or self-closing type. An automatic valve which opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value.

RELIEF VALVE, VACUUM. A valve that automatically opens and closes a vent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value.

RISER, GAS. A vertical pipe supplying fuel gas.

ROOM HEATER, UNVENTED. See “Unvented room heater.”

ROOM HEATER, VENTED. A free-standing gas-fired 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.”

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.

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 that 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 w.c. (50 Pa) 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.

Automatic. An automatic or semiautomatic device consisting essentially of a valve and an 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.

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

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 a pilot or pilots that have 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 gas 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 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 GAS 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, free-standing, 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.

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.

WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.

This section 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 G2401.
The requirements for combustion and dilution air for gas-fired appliances shall be governed by Section G2407. The requirements for combustion and dilution air for appliances operating with fuels other than fuel gas shall be regulated by Chapter 17.
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 R104.11. The approval of unlisted appliances in accordance with Section R104.11 shall be based upon approved engineering evaluation.
Where means for isolation of vibration of an appliance is installed, an approved means for support and restraint of that appliance shall be provided.
Defective material or parts shall be replaced or repaired in such a manner so as to preserve the original approval or listing.
Appliances and supports that are exposed to wind shall be designed and installed to resist the wind pressures determined in accordance with this code.

For structures located in flood hazard areas, the appliance, equipment and system installations regulated by this code shall be located at or above the design flood elevation and shall comply with the flood-resistant construction requirements of Section R322.

Exception: The appliance, equipment and system installations regulated by this code are permitted to be located below the design flood elevation 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 the design flood elevation and shall comply with the flood-resistant construction requirements of Section R322.

When earthquake loads are applicable in accordance with this code, the supports shall be designed and installed for the seismic forces in accordance with this code.
Buildings or structures and the walls enclosing habitable or occupiable rooms and spaces in which persons live, sleep or work, or in which feed, food or foodstuffs are stored, prepared, processed, served or sold, shall be constructed to protect against the entry of rodents.

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 Section M1411.

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.

The building shall not be weakened by the installation of any gas piping. In the process of installing or repairing any gas piping, the finished floors, walls, ceilings, tile work or any other part of the building or premises which are required to be changed or replaced shall be left in a safe structural condition in accordance with the requirements of this code.
Truss members and components shall not be cut, drilled, notched, spliced or otherwise altered in any way without the written concurrence and approval of a registered design professional. Alterations resulting in the addition of loads to any member (e.g., HVAC equipment, water heaters) shall not be permitted without verification that the truss is capable of supporting such additional loading.
Cuts, notches and holes bored in trusses, structural composite lumber, structural glued-laminated members and I-joists are prohibited except where permitted by the manufacturer’s recommendations or where the effects of such alterations are specifically considered in the design of the member by a registered design professional.
Appliances shall be located as required by this section, specific requirements elsewhere in this code and the conditions of the equipment and appliance listing.

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 G2407.5.

3. A single wall-mounted unvented room heater is installed in a bathroom and such unvented room heater is equipped as specified in Section G2445.6 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 G2407.5.

4. A single wall-mounted unvented room heater is installed in a bedroom and such unvented room heater is equipped as specified in Section G2445.6 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 G2407.5.

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 G2407.6.

Appliances installed in outdoor locations shall be either listed for outdoor installation or provided with protection from outdoor environmental factors that influence the operability, durability and safety of the appliance.

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 G2407.5 through G2407.9. Where the requirements of Section G2407.5 are not met, outdoor air shall be introduced in accordance with one of the methods prescribed in Sections G2407.6 through G2407.9. 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 G2439.4.

Appliances shall be located so as not to interfere with proper circulation of combustion, ventilation and dilution air.
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.
Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with the operation of appliances, makeup air shall be provided.
The required volume of indoor air shall be determined in accordance with Section G2407.5.1 or G2407.5.2, except that where the air infiltration rate is known to be less than 0.40 air changes per hour (ACH), Section G2407.5.2 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 G2407.5.3, are considered to be part of the required volume.
The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW).

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 24-1.

(Equation 24-1)

For fan-assisted appliances, calculate volume using Equation 24-2.

(Equation 24-2)

where:

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 24-1 and 24-2.

Openings used to connect indoor spaces shall be sized and located in accordance with Sections G2407.5.3.1 and G2407.5.3.2 (see Figure G2407.5.3).

FIGURE G2407.5.3 (304.5.3)
ALL AIR FROM INSIDE THE BUILDING
(see Section 2407.5.3)

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).
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 (4402 mm2/kW) of total input rating of all appliances.
Outdoor combustion air shall be provided through opening(s) to the outdoors in accordance with Section G2407.6.1 or G2407.6.2. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

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 G2407.6.1(1) and G2407.6.1(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 G2407.6.1(3)].

FIGURE G2407.6.1(1) [304.6.1(1)]
ALL AIR FROM OUTDOOR-INLET AIR FROM VENTILATED
CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC (see Section G2407.6.1)

For SI: 1 foot = 304.8 mm.

FIGURE G2407.6.1(2) [304.6.1(2)]
ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC
(see Section G2407.6.1)

FIGURE G2407.6.1(3) [304.6.1(3)]
ALL AIR FROM OUTDOORS
(see Section G2407.6.1)

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 G2407.6.2) 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 G2407.6.2 (304.6.2)
SINGLE COMBUSTION AIR OPENING,
ALL AIR FROM OUTDOORS
(see Section 2407.6.2)

The use of a combination of indoor and outdoor combustion air shall be in accordance with Sections G2407.7.1 through G2407.7.3.
Where used, openings connecting the interior spaces shall comply with Section G2407.5.3.
Outdoor opening(s) shall be located in accordance with Section G2407.6.

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 G2407.6, multiplied by the reduction factor. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

Engineered combustion air installations shall provide an adequate supply of combustion, ventilation and dilution air and shall be approved.
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.
Where exhaust fans are installed, makeup air shall be provided to replace the exhausted air.
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.
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.
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.

Combustion air ducts shall comply with all of the following:

1. Ducts shall be constructed of galvanized steel complying with Chapter 16 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.

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 vent-type 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.

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 G2404.3 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.

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 and 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.

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.

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 G2408.2.

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.
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 G2409. 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.
Appliances shall be supported and connected to the piping so as not to exert undue strain on the connections.
This section shall govern the reduction in required clearances to combustible materials and combustible assemblies for chimneys, vents, appliances, devices and equipment.

The allowable clearance reduction shall be based on one of the methods specified in Table G2409.2 or shall utilize an assembly listed for such application. Where required clearances are not listed in Table G2409.2, 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 G2409.2(1), G2409.2(2) and G2409.2(3)].

TABLE G2409.2 (308.2)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 G2409.2(1), G2409.2(2), and G2409.2(3)]

WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM
APPLIANCE
, VENT CONNECTOR, OR SINGLE-WALL METAL PIPE IS: (inches)

36

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.

a. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing.

b. 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.

c. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector.

d. For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures G2409.2(2) and G2409.2(3)].

e. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace.

f. 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.

g. 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.

h. 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.

i. 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.

j. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable.

k. Listed single-wall connectors shall be installed in accordance with the manufacturer’s installation instructions.

NOTES:

“A” equals the clearance with no protection.

“B” equals the reduced clearance permitted in accordance with Table G2409.2. The protection applied to the construction using combustible material shall extend far enough in each direction to make “C” equal to “A.”

FIGURE G2409.2(1) [308.2(1)]
EXTENT OF PROTECTION NECESSARY TO REDUCE CLEARANCES FROM GAS EQUIPMENT OR VENT CONNECTORS

For SI: 1 inch = 25.4 mm.

FIGURE G2409.2(2) [308.2(2)]
WALL PROTECTOR CLEARANCE REDUCTION SYSTEM

For SI: 1 inch = 25.4 mm.

FIGURE G2409.2(3) [308.2(3)]
MASONRY CLEARANCE REDUCTION SYSTEM

Clearance requirements for indoor air-conditioning appliances shall comply with Sections G2409.3.1 through G2409.3.5.
Air-conditioning appliances installed in rooms that are large in comparison with the size of the appliance shall be installed with clearances in accordance with the manufacturer’s instructions.
Air-conditioning appliances installed in rooms that are not large in comparison with the size of the appliance, such as alcoves and closets, shall be listed for such installations and installed in accordance with the manufacturer’s instructions. Listed clearances shall not be reduced by the protection methods described in Table G2409.2, regardless of whether the enclosure is of combustible or noncombustible material.
Air-conditioning appliances installed in rooms that are large in comparison with the size of the appliance 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 G2409.2.
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.
Air-conditioning appliances shall have the clearance from supply ducts within 3 feet (914 mm) of the furnace plenum be not less than that specified from the furnace plenum. Clearance is not necessary beyond this distance.
Clearance requirements for central-heating boilers and furnaces shall comply with Sections G2409.4.1 through G2409.4.6. The clearance to these appliances shall not interfere with combustion air; draft hood clearance and relief; and accessibility for servicing.
Central-heating furnaces and low-pressure boilers installed in rooms large in comparison with the size of the appliance shall be installed with clearances in accordance with the manufacturer’s instructions.
Central-heating furnaces and low-pressure boilers installed in rooms that are not large in comparison with the size of the appliance, such as alcoves and closets, shall be listed for such installations. Listed clearances shall not be reduced by the protection methods described in Table G2409.2 and illustrated in Figures G2409.2(1) through G2409.2(3), regardless of whether the enclosure is of combustible or noncombustible material.
Central heating furnaces and low-pressure boilers installed in rooms that are large in comparison with the size of the appliance shall be permitted to be installed with reduced clearances to combustible material provided the combustible material or equipment is protected as described in Table G2409.2.
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.
Central-heating furnaces shall have the clearance from supply ducts within 3 feet (914 mm) of the furnace plenum be not less than that specified from the furnace plenum. No clearance is necessary beyond this distance.
Front clearance shall be sufficient for servicing the burner and the furnace or boiler.
Gas piping shall not be used as a grounding electrode.
Electrical connections between appliances and the building wiring, including the grounding of the appliances, shall conform to Chapters 34 through 43.
Each above-ground portion of a gas piping system other than corrugated stainless steel tubing (CSST), that is likely to become energized shall be electrically continuous and bonded to an effective ground-fault current path. Gas piping, other than CSST, 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.
Corrugated stainless steel tubing (CSST) gas piping systems shall be bonded to the electrical service grounding electrode system at the point where the gas service enters the building. The bonding jumper shall be not smaller than 6 AWG copper wire or equivalent.
This section shall govern the design, installation, modification and maintenance 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, operation and maintenance of such piping systems.
Utility service piping located within buildings shall be installed in accordance with the structural safety and fire protection provisions of this code.
The storage system for liquefied petroleum gas shall be designed and installed in accordance with the International Fire Code and NFPA 58.
In modifying or adding to existing piping systems, sizes shall be maintained in accordance with this chapter.
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.
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.
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.
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.
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 G2413.
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.

The volume of gas to be provided, in cubic feet per hour, shall be determined directly from the manufacturer’s input ratings of the appliances served. Where an input rating is not indicated, the gas supplier, appliance manufacturer or a qualified agency shall be contacted, or the rating from Table G2413.2 shall be used for estimating the volume 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 G2413.2 (402.2)
APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES

APPLIANCE

INPUT BTU/H
(Approx.)

Space Heating Units

Hydronic boiler

Single family

100,000

Multifamily, per unit

60,000

Warm-air furnace

Single family

100,000

Multifamily, per unit

60,000

Space and Water Heating Units

Hydronic boiler

Single family

120,000

Multifamily, per unit

75,000

Water Heating Appliances

Water heater, automatic instantaneous

Capacity at 2 gal./minute

142,800

Capacity at 4 gal./minute

285,000

Capacity at 6 gal./minute

428,400

Water heater, automatic storage, 30- to
40-gal. tank

35,000

Water heater, automatic storage, 50-gal. tank

50,000

Water heater, domestic, circulating or side-arm

35,000

Cooking Appliances

Built-in oven or broiler unit, domestic

25,000

Built-in top unit, domestic

40,000

Range, free-standing, domestic

65,000

Other Appliances

Barbecue

40,000

Clothes dryer, Type 1 (domestic)

35,000

Gas fireplace, direct-vent

40,000

Gas light

2,500

Gas log

80,000

Refrigerator

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.

Gas piping shall be sized in accordance with one of the following:

1. Pipe sizing tables or sizing equations in accordance with Section G2413.4.

2. The sizing tables included in a listed piping system’s manufacturer’s installation instructions.

3. Other approved engineering methods.

Where Tables G2413.4(1) through G2413.4(21) are used to size piping or tubing, the pipe length shall be determined in accordance with Section G2413.4.1, G2413.4.2 or G2413.4.3.

TABLE G2413.4(1) [402.4(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

34,300

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 G2413.4(2) [402.4(3)]
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

4,930

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

11,500

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 G2413.4(3) [402.4(7)]
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

232

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

35

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 G2413.4(4) [402.4(10)]
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

993

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

1,940

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 G2413.4(5) [402.4(13)]
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 G2413.4(6) [402.4(16)]
CORRUGATED STAINLESS STEEL TUBING (CSST)

Gas

Natural

Inlet Pressure

2.0 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

4,820

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

6,030

6,880

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

157

263

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 can 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 G2413.4(7) [402.4(19)]
POLYETHYLENE PLASTIC PIPE

Gas

Natural

Inlet Pressure

Less than 2 psi

Pressure Drop

0.5 in. w.c.

Specific Gravity

0.60

PIPE SIZE (in.)

Nominal OD

1/2

3/4

1

11/4

11/2

2

Designation

SDR 9.33

SDR 11.0

SDR 11.00

SDR 10.00

SDR 11.00

SDR 11.00

Actual ID

0.660

0.860

1.077

1.328

1.554

1.943

Length (ft)

Capacity in Cubic Feet of Gas per Hour

10

201

403

726

1,260

1,900

3,410

20

138

277

499

865

1,310

2,350

30

111

222

401

695

1,050

1,880

40

95

190

343

594

898

1,610

50

84

169

304

527

796

1,430

60

76

153

276

477

721

1,300

70

70

140

254

439

663

1,190

80

65

131

236

409

617

1,110

90

61

123

221

383

579

1,040

100

58

116

209

362

547

983

125

51

103

185

321

485

871

150

46

93

168

291

439

789

175

43

86

154

268

404

726

200

40

80

144

249

376

675

250

35

71

127

221

333

598

300

32

64

115

200

302

542

350

29

59

106

184

278

499

400

27

55

99

171

258

464

450

26

51

93

160

242

435

500

24

48

88

152

229

411

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 G2413.4(8) [402.4(20)]
POLYETHYLENE PLASTIC PIPE

Gas

Natural

Inlet Pressure

2.0 psi

Pressure Drop

1.0 psi

Specific Gravity

0.60

PIPE SIZE (in.)

Nominal OD

1/2

3/4

1

11/4

11/2

2

Designation

SDR 9.33

SDR 11.0

SDR 11.00

SDR 10.00

SDR 11.00

SDR 11.00

Actual ID

0.660

0.860

1.077

1.328

1.554

1.943

Length (ft)

Capacity in Cubic Feet of Gas per Hour

10

1,860

3,720

6,710

11,600

17,600

31,600

20

1,280

2,560

4,610

7,990

12,100

21,700

30

1,030

2,050

3,710

6,420

9,690

17,400

40

878

1,760

3,170

5,490

8,300

14,900

50

778

1,560

2,810

4,870

7,350

13,200

60

705

1,410

2,550

4,410

6,660

12,000

70

649

1,300

2,340

4,060

6,130

11,000

80

603

1,210

2,180

3,780

5,700

10,200

90

566

1,130

2,050

3,540

5,350

9,610

100

535

1,070

1,930

3,350

5,050

9,080

125

474

949

1,710

2,970

4,480

8,050

150

429

860

1,550

2,690

4,060

7,290

175

395

791

1,430

2,470

3,730

6,710

200

368

736

1,330

2,300

3,470

6,240

250

326

652

1,180

2,040

3,080

5,530

300

295

591

1,070

1,850

2,790

5,010

350

272

544

981

1,700

2,570

4,610

400

253

506

913

1,580

2,390

4,290

450

237

475

856

1,480

2,240

4,020

500

224

448

809

1,400

2,120

3,800

550

213

426

768

1,330

2,010

3,610

600

203

406

733

1,270

1,920

3,440

650

194

389

702

1,220

1,840

3,300

700

187

374

674

1,170

1,760

3,170

750

180

360

649

1,130

1,700

3,050

800

174

348

627

1,090

1,640

2,950

850

168

336

607

1,050

1,590

2,850

900

163

326

588

1,020

1,540

2,770

950

158

317

572

990

1,500

2,690

1,000

154

308

556

963

1,450

2,610

1,100

146

293

528

915

1,380

2,480

1,200

139

279

504

873

1,320

2,370

1,300

134

267

482

836

1,260

2,270

1,400

128

257

463

803

1,210

2,180

1,500

124

247

446

773

1,170

2,100

1,600

119

239

431

747

1,130

2,030

1,700

115

231

417

723

1,090

1,960

1,800

112

224

404

701

1,060

1,900

1,900

109

218

393

680

1,030

1,850

2,000

106

212

382

662

1,000

1,800

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 G2413.4(9) [402.4(23)]
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 (in.)

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

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

9,340

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

11,200

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

870

1,790

2,680

5,160

8,220

14,500

29,600

1,600

213

446

840

1,730

2,590

4,980

7,940

14,000

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 G2413.4(10) [402.4(24)]
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 (in)

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 G2413.4(11) [402.4(25)]
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 (in.)

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 G2413.4(12) [402.4(26)]
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 (in.)

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 G2413.4(13) [402.4(27)]
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 G2413.4(14) [402.4(28)]
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 (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

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 G2413.4(15) [402.4(29)]
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 (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

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 G2413.4(16) [402.4(30)]
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 G2413.4(17) [402.4(31)]
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 = 6.895 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 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 can 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 G2413.4(18) [402.4(32)]
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 can 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 G2413.4(19) [402.4(33)]
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 2-stage regulator at tank or second stage (low pressure regulator) and building.

PIPE SIZE (in.)

Nominal OD

1/2

3/4

1

11/4

11/2

2

Designation

SDR 9.33

SDR 11.0

SDR 11.00

SDR 10.00

SDR 11.00

SDR 11.00

Actual ID

0.660

0.860

1.077

1.328

1.554

1.943

Length (ft)

Capacity in Thousands of Btu per Hour

10

340

680

1,230

2,130

3,210

5,770

20

233

468

844

1,460

2,210

3,970

30

187

375

677

1,170

1,770

3,180

40

160

321

580

1,000

1,520

2,730

50

142

285

514

890

1,340

2,420

60

129

258

466

807

1,220

2,190

70

119

237

428

742

1,120

2,010

80

110

221

398

690

1,040

1,870

90

103

207

374

648

978

1,760

100

98

196

353

612

924

1,660

125

87

173

313

542

819

1,470

150

78

157

284

491

742

1,330

175

72

145

261

452

683

1,230

200

67

135

243

420

635

1,140

250

60

119

215

373

563

1,010

300

54

108

195

338

510

916

350

50

99

179

311

469

843

400

46

92

167

289

436

784

450

43

87

157

271

409

736

500

41

82

148

256

387

695

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 G2413.4(20) [402.4(34)]
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 (in.)

Nominal OD

1/2

3/4

1

11/4

11/2

2

Designation

SDR 9.33

SDR 11.0

SDR 11.00

SDR 10.00

SDR 11.00

SDR 11.00

Actual ID

0.660

0.860

1.077

1.328

1.554

1.943

Length (ft)

Capacity in Thousands of Btu per Hour

10

3,130

6,260

11,300

19,600

29,500

53,100

20

2,150

4,300

7,760

13,400

20,300

36,500

30

1,730

3,450

6,230

10,800

16,300

29,300

40

1,480

2,960

5,330

9,240

14,000

25,100

50

1,310

2,620

4,730

8,190

12,400

22,200

60

1,190

2,370

4,280

7,420

11,200

20,100

70

1,090

2,180

3,940

6,830

10,300

18,500

80

1,010

2,030

3,670

6,350

9,590

17,200

90

952

1,910

3,440

5,960

9,000

16,200

100

899

1,800

3,250

5,630

8,500

15,300

125

797

1,600

2,880

4,990

7,530

13,500

150

722

1,450

2,610

4,520

6,830

12,300

175

664

1,330

2,400

4,160

6,280

11,300

200

618

1,240

2,230

3,870

5,840

10,500

250

548

1,100

1,980

3,430

5,180

9,300

300

496

994

1,790

3,110

4,690

8,430

350

457

914

1,650

2,860

4,320

7,760

400

425

851

1,530

2,660

4,020

7,220

450

399

798

1,440

2,500

3,770

6,770

500

377

754

1,360

2,360

3,560

6,390

550

358

716

1,290

2,240

3,380

6,070

600

341

683

1,230

2,140

3,220

5,790

650

327

654

1,180

2,040

3,090

5,550

700

314

628

1,130

1,960

2,970

5,330

750

302

605

1,090

1,890

2,860

5,140

800

292

585

1,050

1,830

2,760

4,960

850

283

566

1,020

1,770

2,670

4,800

900

274

549

990

1,710

2,590

4,650

950

266

533

961

1,670

2,520

4,520

1,000

259

518

935

1,620

2,450

4,400

1,100

246

492

888

1,540

2,320

4,170

1,200

234

470

847

1,470

2,220

3,980

1,300

225

450

811

1,410

2,120

3,810

1,400

216

432

779

1,350

2,040

3,660

1,500

208

416

751

1,300

1,960

3,530

1,600

201

402

725

1,260

1,900

3,410

1,700

194

389

702

1,220

1,840

3,300

1,800

188

377

680

1,180

1,780

3,200

1,900

183

366

661

1,140

1,730

3,110

2,000

178

356

643

1,110

1,680

3,020

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 G2413.4(21) [402.4(35)]
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 2-stage regulator at tank or second stage (low pressure regulator) and building.

Plastic Tubing Size (CTS) (in.)

Nominal OD

1/2

1

Designation

SDR 7.00

SDR 11.00

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.

Where Equations 24-3 and 24-4 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 G2413.4.1, G2413.4.2 or G2413.4.3.

1. Low-pressure gas equation [Less than 1.5 pounds per square inch (psi) (10.3 kPa)]:

(Equation 24-3)


2. High-pressure gas equation [1.5 psi (10.3 kPa) and above]:

(Equation 24-4)

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.

DH = Pressure drop, inch water column (27.7 inch water column = 1 psi).

TABLE G2413.4 (402.4)
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 =
0.249 kPa, 1 pound per square inch = 6.895 kPa, 1 British thermal
unit per hour = 0.293 W.

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.

Pipe 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.

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.
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.

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 a temporary installation for buildings under construction.

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.
Materials used for piping systems shall comply with the requirements of this chapter or shall be approved.
Pipe, fittings, valves or other materials shall not be used again unless they are free of foreign materials and have been ascertained to be adequate for the service intended.
Material not covered by the standards specifications listed herein shall be investigated and tested to determine that it is safe and suitable for the proposed service, and, in addition, shall be recommended for that service by the manufacturer and shall be approved by the code official.
Metallic pipe shall comply with Sections G2414.4.1 and G2414.4.2.
Cast-iron pipe shall not be used.

Steel and wrought-iron pipe shall be at least of standard weight (Schedule 40) and shall comply with one of the following:

1. ASME B 36.10, 10M;

2. ASTM A 53/A 53M; or

3. ASTM A 106.

Seamless copper, aluminum alloy or steel tubing shall be permitted to be used with gases not corrosive to such material.
Steel tubing shall comply with ASTM A 254.

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).

Corrugated stainless steel tubing shall be listed in accordance with ANSI LC 1/CSA 6.26.
Plastic pipe, tubing and fittings used to supply fuel gas shall conform to ASTM D 2513. Pipe shall be marked “Gas” and “ASTM D 2513.”

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 by the manufacturer and shall be designed certified to meet the requirements of Category I 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 qualified installation instructions as prescribed by the U.S. Department of Transportation, Code of Federal Regulations, Title 49, Part 192.283(b).

The use of plastic pipe, tubing and fittings in undiluted liquefied petroleum gas piping systems shall be in accordance with NFPA 58.
Plastic pipe, tubing and fittings used to connect regulator vents to remote vent terminations shall be of PVC conforming to ANSI/UL 651. PVC vent piping shall not be installed indoors.

Pipe or 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 or tubing or fittings shall not be repaired. Defective pipe, tubing or fittings shall be replaced. (See Section G2417.1.2.)

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.
Metallic pipe and fitting threads shall be taper pipe threads and shall comply with ASME B1.20.1.
Pipe with threads that are stripped, chipped, corroded or otherwise damaged shall not be used. If a weld opens during the operation of cutting or threading, that portion of the pipe shall not be used.

Field threading of metallic pipe shall be in accordance with Table G2414.9.2.

TABLE G2414.9.2 (403.9.2)
SPECIFICATIONS FOR THREADING METALLIC PIPE

IRON PIPE SIZE
(inches)

APPROXIMATE LENGTH OF THREADED PORTION (inches)

APPROXIMATE NO. OF THREADS TO BE CUT

1/2

3/4

10

3/4

3/4

10

1

7/8

10

11/4

1

11

11/2

1

11

For SI: 1 inch = 25.4 mm.

Thread (joint) compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or to any other chemical constituents of the gases to be conducted through the piping.
The type of piping joint used shall be suitable for the pressure-temperature conditions and shall be selected giving consideration to joint tightness and mechanical strength under the service conditions. The joint shall be able to sustain the maximum end force due to the internal pressure and any additional forces due to temperature expansion or contraction, vibration, fatigue, or to the weight of the pipe and its contents.
Pipe joints shall be threaded, flanged, brazed or welded. Where nonferrous pipe is brazed, the brazing materials shall have a melting point in excess of 1,000°F (538°C). Brazing alloys shall not contain more than 0.05-percent phosphorus.
Tubing joints shall be made with approved gas tubing fittings or be brazed with a material having a melting point in excess of 1,000°F (538°C) or made with press-connect fittings complying with ANSI LC-4. Brazing alloys shall not contain more than 0.05-percent phosphorus.
Flared joints shall be used only in systems constructed from nonferrous pipe and tubing where experience or tests have demonstrated that the joint is suitable for the conditions and where provisions are made in the design to prevent separation of the joints.

Metallic fittings, including valves, strainers and filters shall comply with the following:

1. Fittings used with steel or wrought-iron pipe shall be steel, brass, bronze, malleable iron, ductile iron or cast iron.

2. Fittings used with copper or brass pipe shall be copper, brass or bronze.

3. Cast-iron bushings shall be prohibited.

4. Special fittings. Fittings such as couplings, proprietary-type joints, saddle tees, gland-type compression fittings, and flared, flareless or compression-type tubing fittings shall be: used within the fitting manufacturer’s pressure-temperature recommendations; used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion or contraction; installed or braced to prevent separation of the joint by gas pressure or external physical damage; and shall be approved.

Plastic pipe, tubing and fittings shall be joined in accordance with the manufacturers’ instructions. Such joints shall comply with the following:

1. The joints shall be designed and installed so that the longitudinal pull-out resistance of the joints will be at least equal to the tensile strength of the plastic piping material.

2. Heat-fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gas-tight joints at least as strong as the pipe or tubing being joined. Joints shall be made with the joining method recommended by the pipe manufacturer. Heat fusion fittings shall be marked “ASTM D 2513.”

3. Where compression-type mechanical joints are used, the gasket material in the fitting shall be compatible with the plastic piping and with the gas distributed by the system. An internal tubular rigid stiffener shall be used in conjunction with the fitting. The stiffener shall be flush with the end of the pipe or tubing and shall extend at least to the outside end of the compression fitting when installed. The stiffener shall be free of rough or sharp edges and shall not be a force fit in the plastic. Split tubular stiffeners shall not be used.

4. Plastic piping joints and fittings for use in liquefied petroleum gas piping systems shall be in accordance with NFPA 58.

Piping shall not be installed in or through a ducted supply, return or exhaust, or a clothes chute, chimney or gas vent, dumbwaiter or elevator shaft. Piping installed downstream of the point of delivery shall not extend through any townhouse unit other than the unit served by such piping.
Concealed piping shall not be located in solid partitions and solid walls, unless installed in a chase or casing.

Portions of a piping system installed in concealed locations shall not have unions, tubing fittings, right and left couplings, bushings, compression couplings, and swing joints made by combinations of fittings.

Exceptions:

1. Tubing joined by brazing.

2. Fittings listed for use in concealed locations.

Gas piping shall not penetrate building foundation walls at any point below grade. Gas piping shall enter and exit a building at a point above grade and the annular space between the pipe and the wall shall be sealed.
In concealed locations, where piping other than black or galvanized steel is installed through holes or notches in wood studs, joists, rafters or similar members less than 11/2 inches (38 mm) from the nearest edge of the member, the pipe shall be protected by shield plates. Protective steel shield plates having a minimum thickness of 0.0575-inch (1.463 mm) (No. 16 Gage) shall cover the area of the pipe where the member is notched or bored and shall extend a minimum of 4 inches (102 mm) above sole plates, below top plates and to each side of a stud, joist or rafter.
Piping in solid floors shall be laid in channels in the floor and covered in a manner that will allow access to the piping with a minimum amount of damage to the building. Where such piping is subject to exposure to excessive moisture or corrosive substances, the piping shall be protected in an approved manner. As an alternative to installation in channels, the piping shall be installed in a conduit of Schedule 40 steel, wrought iron, PVC or ABS pipe in accordance with Section G2415.6.1 or G2415.6.2.
The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. If the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside of the building, shall be vented above grade to the outdoors and shall be installed to prevent the entrance of water and insects.
Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.
All piping installed outdoors shall be elevated not less than 31/2 inches (152 mm) above ground and where installed across roof surfaces, shall be elevated not less than 31/2 inches (152 mm) above the roof surface. Piping installed above ground, outdoors, and installed across the surface of roofs shall be securely supported and located where it will be protected from physical damage. Where passing through an outside wall, the piping shall also be protected against corrosion by coating or wrapping with an inert material. Where piping is encased in a protective pipe sleeve, the annular space between the piping and the sleeve shall be sealed.
Metallic piping and metallic tubing that conveys fuel gas from an LP-gas storage container shall be provided with an approved dielectric fitting to electrically isolate the underground portion of the pipe or tube from the above ground portion that enters a building. Such dielectric fitting shall be installed aboveground outdoors.
Metallic pipe or tubing exposed to corrosive action, such as soil condition or moisture, shall be protected in an approved manner. Zinc coatings (galvanizing) shall not be deemed adequate protection for gas piping underground. Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used. Piping shall not be laid in contact with cinders.
Uncoated threaded or socket welded joints shall not be used in piping in contact with soil or where internal or external crevice corrosion is known to occur.

Pipe protective coatings and wrappings shall be approved for the application and shall be factory applied.

Exception: Where installed in accordance with the manufacturer’s installation instructions, field application of coatings and wrappings shall be permitted for pipe nipples, fittings and locations where the factory coating or wrapping has been damaged or necessarily removed at joints.

Underground piping systems shall be installed a minimum depth of 12 inches (305 mm) below grade, except as provided for in Section G2415.10.1.
Individual lines to outside lights, grills or other appliances shall be installed a minimum of 8 inches (203 mm) below finished grade, provided that such installation is approved and is installed in locations not susceptible to physical damage.
The trench shall be graded so that the pipe has a firm, substantially continuous bearing on the bottom of the trench.
Piping installed underground beneath buildings is prohibited except where the piping is encased in a conduit of wrought iron, plastic pipe, steel pipe or other approved conduit material designed to withstand the superimposed loads. The conduit shall be protected from corrosion in accordance with Section G2415.9 and shall be installed in accordance with Section G2415.12.1 or G2415.12.2.
The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. Where the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.
Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.

Gas outlets that do not connect to appliances shall be capped gas tight.

Exception: Listed and labeled flush-mounted-type quick-disconnect devices and listed and labeled gas convenience outlets shall be installed in accordance with the manufacturer’s installation instructions.

The unthreaded portion of piping outlets shall extend not less than l inch (25 mm) through finished ceilings and walls and where extending through floors, outdoor patios and slabs, shall not be less than 2 inches (51 mm) above them. The outlet fitting or piping shall be securely supported. Outlets shall not be placed behind doors. Outlets shall be located in the room or space where the appliance is installed.

Exception: Listed and labeled flush-mounted-type quick-disconnect devices and listed and labeled gas convenience outlets shall be installed in accordance with the manufacturer’s installation instructions.

The installation of plastic pipe shall comply with Sections G2415.15.1 through G2415.15.3.

Plastic pipe shall be installed outdoors underground only. Plastic pipe shall not be used within or under any building or slab or be operated at pressures greater than 100 psig (689 kPa) for natural gas or 30 psig (207 kPa) for LP-gas.

Exceptions:

1. Plastic pipe shall be permitted to terminate above ground outside of buildings where installed in premanufactured anodeless risers or service head adapter risers that are installed in accordance with the manufacturer’s installation instructions.

2. Plastic pipe shall be permitted to terminate with a wall head adapter within buildings where the plastic pipe is inserted in a piping material for fuel gas use in buildings.

3. Plastic pipe shall be permitted under outdoor patio, walkway and driveway slabs provided that the burial depth complies with Section G2415.10.

Connections outdoors and underground between metallic and plastic piping shall be made only with transition fittings conforming to ASTM D 2513 Category I or ASTM F 1973.
A yellow insulated copper tracer wire or other approved conductor shall be installed adjacent to underground nonmetallic piping. Access shall be provided to the tracer wire or the tracer wire shall terminate above ground at each end of the nonmetallic piping. The tracer wire size shall not be less than 18 AWG and the insulation type shall be suitable for direct burial.

A device shall not be placed inside the piping or fittings that will reduce the cross-sectional area or otherwise obstruct the free flow of gas.

Exception: Approved gas filters.

Before any system of piping is put in service or concealed, it shall be tested to ensure that it is gas tight. Testing, inspection and purging of piping systems shall comply with Section G2417.
Changes in direction of pipe shall be permitted to be made by the use of fittings, factory bends or field bends.

Metallic pipe bends shall comply with the following:

1. Bends shall be made only with bending tools and procedures intended for that purpose.

2. All bends shall be smooth and free from buckling, cracks or other evidence of mechanical damage.

3. The longitudinal weld of the pipe shall be near the neutral axis of the bend.

4. Pipe shall not be bent through an arc of more than 90 degrees (1.6 rad).

5. The inside radius of a bend shall be not less than six times the outside diameter of the pipe.

Plastic pipe bends shall comply with the following:

1. The pipe shall not be damaged and the internal diameter of the pipe shall not be effectively reduced.

2. Joints shall not be located in pipe bends.

3. The radius of the inner curve of such bends shall not be less than 25 times the inside diameter of the pipe.

4. Where the piping manufacturer specifies the use of special bending tools or procedures, such tools or procedures shall be used.

Prior to acceptance and initial operation, all piping installations shall be inspected and pressure tested to determine that the materials, design, fabrication, and installation practices comply with the requirements of this code.
Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly or pressure tests as appropriate.

In the event repairs or additions are made after the pressure test, the affected piping shall be tested.

Minor repairs and additions are not required to be pressure tested provided that the work is inspected and connections are tested with a noncorrosive leak-detecting fluid or other approved leak-detecting methods.

Where new branches are installed to new appliances, only the newly installed branches shall be required to be pressure tested. Connections between the new piping and the existing piping shall be tested with a noncorrosive leak-detecting fluid or other approved leak-detecting methods.
A piping system shall be permitted to be tested as a complete unit or in sections. Under no circumstances shall a valve in a line be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, unless two valves are installed in series with a valved “tell-tale” located between these valves. A valve shall not be subjected to the test pressure unless it can be determined that the valve, including the valve closing mechanism, is designed to safely withstand the test pressure.
Regulator and valve assemblies fabricated independently of the piping system in which they are to be installed shall be permitted to be tested with inert gas or air at the time of fabrication.
The test medium shall be air, nitrogen, carbon dioxide or an inert gas. Oxygen shall not be used.

Pipe joints, including welds, shall be left exposed for examination during the test.

Exception: Covered or concealed pipe end joints that have been previously tested in accordance with this code.

Expansion joints shall be provided with temporary restraints, if required, for the additional thrust load under test.
Equipment that is not to be included in the test shall be either disconnected from the piping or isolated by blanks, blind flanges or caps.
Where the piping system is connected to appliances or equipment designed for operating pressures of less than the test pressure, such appliances or equipment shall be isolated from the piping system by disconnecting them and capping the outlet(s).
Where the piping system is connected to appliances or equipment designed for operating pressures equal to or greater than the test pressure, such appliances or equipment shall be isolated from the piping system by closing the individual appliance or equipment shutoff valve(s).
All testing of piping systems shall be done with due regard for the safety of employees and the public during the test. Prior to testing, the interior of the pipe shall be cleared of all foreign material.
Test pressure shall be measured with a manometer or with a pressure-measuring device designed and calibrated to read, record, or indicate a pressure loss caused by leakage during the pressure test period. The source of pressure shall be isolated before the pressure tests are made. Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than five times the test pressure.
The test pressure to be used shall be not less than one and one-half times the proposed maximum working pressure, but not less than 3 psig (20 kPa gauge), irrespective of design pressure. Where the test pressure exceeds 125 psig (862 kPa gauge), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.
The test duration shall be not less than 10 minutes.
The piping system shall withstand the test pressure specified without showing any evidence of leakage or other defects. Any reduction of test pressures as indicated by pressure gauges shall be deemed to indicate the presence of a leak unless such reduction can be readily attributed to some other cause.
The leakage shall be located by means of an approved combustible gas detector, a noncorrosive leak detection fluid or an equivalent nonflammable solution. Matches, candles, open flames or other methods that could provide a source of ignition shall not be used.
Where leakage or other defects are located, the affected portion of the piping system shall be repaired or replaced and retested.
Leakage checking of systems and equipment shall be in accordance with Sections G2417.6.1 through G2417.6.4.
Fuel gas shall be permitted to be used for leak checks in piping systems that have been tested in accordance with Section G2417.
During the process of turning gas on into a system of new gas piping, the entire system shall be inspected to determine that there are no open fittings or ends and that all valves at unused outlets are closed and plugged or capped.
Immediately after the gas is turned on into a new system or into a system that has been initially restored after an interruption of service, the piping system shall be checked for leakage. Where leakage is indicated, the gas supply shall be shut off until the necessary repairs have been made.
Appliances and equipment shall not be placed in operation until after the piping system has been checked for leakage and determined to be free of leakage and purged in accordance with Section G2417.7.2.
Purging of piping shall comply with Sections G2417.7.1 through G2417.7.4.
When gas piping is to be opened for servicing, addition or modification, the section to be worked on shall be turned off from the gas supply at the nearest convenient point, and the line pressure vented to the outdoors, or to ventilated areas of sufficient size to prevent accumulation of flammable mixtures.
When piping full of air is placed in operation, the air in the piping shall be displaced with fuel gas. The air can be safely displaced with fuel gas provided that a moderately rapid and continuous flow of fuel gas is introduced at one end of the line and air is vented out at the other end. The fuel gas flow should be continued without interruption until the vented gas is free of air. The point of discharge shall not be left unattended during purging. After purging, the vent shall then be closed.
The open end of piping systems being purged shall not discharge into confined spaces or areas where there are sources of ignition unless precautions are taken to perform this operation in a safe manner by ventilation of the space, control or purging rate, and elimination of all hazardous conditions.
After the piping system has been placed in operation, all appliances and equipment shall be purged and then placed in operation, as necessary.
Piping shall be provided with support in accordance with Section G2418.2.
Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers or building structural components suitable for the size of piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration. Piping shall be anchored to prevent undue strains on connected appliances and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58 and shall be spaced in accordance with Section G2424. Supports, hangers and anchors shall be installed so as not to interfere with the free expansion and contraction of the piping between anchors. All parts of the supporting equipment shall be designed and installed so that they will not be disengaged by movement of the supported piping.
Piping for other than dry gas conditions shall be sloped not less than 0.25 inch in 15 feet (6.4 mm in 4572 mm) to prevent traps.
Where wet gas exists, a drip shall be provided at any point in the line of pipe where condensate could collect. A drip shall also be provided at the outlet of the meter and shall be installed so as to constitute a trap wherein an accumulation of condensate will shut off the flow of gas before the condensate will run back into the meter.
Drips shall be provided with ready access to permit cleaning or emptying. A drip shall not be located where the condensate is subject to freezing.
Where a sediment trap is not incorporated as part of the appliance, a sediment trap shall be installed downstream of the appliance shutoff valve as close to the inlet of the appliance as practical. The sediment trap shall be either a tee fitting having a capped nipple of any length installed vertically in the bottom-most opening of the tee or other device approved as an effective sediment trap. Illuminating appliances, ranges, clothes dryers and outdoor grills need not be so equipped.
Piping systems shall be provided with shutoff valves in accordance with this section.

Shutoff valves shall be of an approved type; shall be constructed of materials compatible with the piping; and shall comply with the standard that is applicable for the pressure and application, in accordance with Table G2420.1.1.

TABLE G2420.1.1
MANUAL GAS VALVE STANDARDS

VALVE STANDARDS

APPLIANCE SHUTOFF VALVE APPLICATION UP TO 1/2 psig PRESSURE

OTHER VALVE APPLICATIONS

UP TO 1/2 psig PRESSURE

UP TO 2 psig PRESSURE

UP TO 5 psig PRESSURE

UP TO 125 psig PRESSURE

ANSI Z21.15

X

CSA Requirement 3-88

X

X

Xa

Xb

ASME B16.44

X

X

Xa

Xb

ASME B16.33

X

X

X

X

X

For SI: 1 pound per square inch gauge = 6.895 kPa.

a. If labeled 2G.

b. If labeled 5G.

Shutoff valves shall be prohibited in concealed locations and furnace plenums.
Shutoff valves shall be located in places so as to provide access for operation and shall be installed so as to be protected from damage.
Every meter shall be equipped with a shutoff valve located on the supply side of the meter.
In a common system serving more than one building, shutoff valves shall be installed outdoors at each building.
A listed shutoff valve shall be installed immediately ahead of each MP regulator.
Each appliance shall be provided with a shutoff valve in accordance with Section G2420.5.1, G2420.5.2 or G2420.5.3.
The shutoff valve shall be located in the same room as the appliance. The shutoff valve shall be within 6 feet (1829 mm) of the appliance, and shall be installed upstream of the union, connector or quick disconnect device it serves. Such shutoff valves shall be provided with access. Appliance shutoff valves located in the firebox of a fireplace shall be installed in accordance with the appliance manufacturer’s instructions.
Shutoff valves for vented decorative appliances, room heaters and decorative appliances for installation in vented fireplaces shall be permitted to be installed in an area remote from the appliances where such valves are provided with ready access. Such valves shall be permanently identified and shall serve no other appliance. The piping from the shutoff valve to within 6 feet (1829 mm) of the appliance shall be designed, sized and installed in accordance with Sections G2412 through G2419.
Where the appliance shutoff valve is installed at a manifold, such shutoff valve shall be located within 50 feet (15 240 mm) of the appliance served and shall be readily accessible and permanently identified. The piping from the manifold to within 6 feet (1829 mm) of the appliance shall be designed, sized and installed in accordance with Sections G2412 through G2419.
A line pressure regulator shall be installed where the appliance is designed to operate at a lower pressure than the supply pressure. Line gas pressure regulators shall be listed as complying with ANSI Z21.80. Access shall be provided to pressure regulators. Pressure regulators shall be protected from physical damage. Regulators installed on the exterior of the building shall be approved for outdoor installation.

MP pressure regulators shall comply with the following:

1. The MP regulator shall be approved and shall be suitable for the inlet and outlet gas pressures for the application.

2. The MP regulator shall maintain a reduced outlet pressure under lockup (no-flow) conditions.

3. The capacity of the MP regulator, determined by published ratings of its manufacturer, shall be adequate to supply the appliances served.

4. The MP pressure regulator shall be provided with access. Where located indoors, the regulator shall be vented to the outdoors or shall be equipped with a leak-limiting device, in either case complying with Section G2421.3.

5. A tee fitting with one opening capped or plugged shall be installed between the MP regulator and its upstream shutoff valve. Such tee fitting shall be positioned to allow connection of a pressure measuring instrument and to serve as a sediment trap.

6. A tee fitting with one opening capped or plugged shall be installed not less than 10 pipe diameters downstream of the MP regulator outlet. Such tee fitting shall be positioned to allow connection of a pressure measuring instrument.

Pressure regulators that require a vent shall be vented directly to the outdoors. The vent shall be designed to prevent the entry of insects, water and foreign objects.

Exception: A vent to the outdoors is not required for regulators equipped with and labeled for utilization with an approved vent-limiting device installed in accordance with the manufacturer’s instructions.

Vent piping for relief vents and breather vents shall be constructed of materials allowed for gas piping in accordance with Section G2414. Vent piping shall be not smaller than the vent connection on the pressure regulating device. Vent piping serving relief vents and combination relief and breather vents shall be run independently to the outdoors and shall serve only a single device vent. Vent piping serving only breather vents is permitted to be connected in a manifold arrangement where sized in accordance with an approved design that minimizes back pressure in the event of diaphragm rupture. Regulator vent piping shall not exceed the length specified in the regulator manufacturer’s installation instructions.

Appliances shall be connected to the piping system by one of the following:

1. Rigid metallic pipe and fittings.

2. Corrugated stainless steel tubing (CSST) where installed in accordance with the manufacturer’s instructions.

3. Listed and labeled appliance connectors in compliance with ANSI Z21.24 and installed in accordance with the manufacturer’s installation instructions and located entirely in the same room as the appliance.

4. Listed and labeled quick-disconnect devices used in conjunction with listed and labeled appliance connectors.

5. Listed and labeled convenience outlets used in conjunction with listed and labeled appliance connectors.

6. Listed and labeled outdoor appliance connectors in compliance with ANSI Z21.75/CSA 6.27 and installed in accordance with the manufacturer’s installation instructions.

Connectors and tubing shall be installed so as to be protected against physical damage.
Appliance fuel connectors shall be installed in accordance with the manufacturer’s instructions and Sections G24221.2.1 through G2422.1.2.4.

Connectors shall not exceed 6 feet (1829 mm) in overall length. Measurement shall be made along the centerline of the connector. Only one connector shall be used for each appliance.

Exception: Rigid metallic piping used to connect an appliance to the piping system shall be permitted to have a total length greater than 6 feet (1829 mm) provided that the connecting pipe is sized as part of the piping system in accordance with Section G2413 and the location of the appliance shutoff valve complies with Section G2420.5.

Connectors shall have the capacity for the total demand of the connected appliance.

Connectors shall not be concealed within, or extended through, walls, floors, partitions, ceilings or appliance housings.

Exceptions:

1. Connectors constructed of materials allowed for piping systems in accordance with Section G2414 shall be permitted to pass through walls, floors, partitions and ceilings where installed in accordance with Section G2420.5.2 or G2420.5.3.

2. Rigid steel pipe connectors shall be permitted to extend through openings in appliance housings.

3. Fireplace inserts that are factory equipped with grommets, sleeves or other means of protection in accordance with the listing of the appliance.

4. Semirigid tubing and listed connectors shall be permitted to extend through an opening in an appliance housing, cabinet or casing where the tubing or connector is protected against damage.

A shutoff valve not less than the nominal size of the connector shall be installed ahead of the connector in accordance with Section G2420.5.
Internal combustion engines shall not be rigidly connected to the gas supply piping.
A union fitting shall be provided for appliances connected by rigid metallic pipe. Such unions shall be accessible and located within 6 feet (1829 mm) of the appliance.
Where appliances are equipped with casters or are otherwise subject to periodic movement or relocation for purposes such as routine cleaning and maintenance, such appliances shall be connected to the supply system piping by means of an approved flexible connector designed and labeled for the application. Such flexible connectors shall be installed and protected against physical damage in accordance with the manufacturer’s installation instructions.
Suspended low-intensity infrared tube heaters shall be connected to the building piping system with a connector listed for the application complying with ANSI Z21.24/CGA 6.10. The connector shall be installed as specified by the tube heater manufacturer’s instructions.
Motor fuel-dispensing facilities for CNG fuel shall be in accordance with Section 413 of the International Fuel Gas Code.

Piping shall be supported at intervals not exceeding the spacing specified in Table G2424.1. Spacing of supports for CSST shall be in accordance with the CSST manufacturer’s instructions.

TABLE G2424.1
SUPPORT OF PIPING

STEEL PIPE,
NOMINAL SIZE
OF PIPE
(inches)

SPACING OF SUPPORTS
(feet)

NOMINAL SIZE OF TUBING
SMOOTH-WALL
(inch O.D.)

SPACING OF SUPPORTS
(feet)

1/2

6

1/2

4

3/4 or 1

8

5/8 or 3/4

6

11/4 or larger
(horizontal)

10

7/8 or 1 (horizontal)

8

11/4 or larger
(vertical)

Every floor level

1 or larger

(vertical)

Every floor level

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

This section shall govern the installation, maintenance, repair and approval of factory-built and masonry chimneys, chimney liners, vents and connectors serving gas-fired appliances.
Every appliance shall discharge the products of combustion to the outdoors, except for appliances exempted by Section G2425.8.
Masonry chimneys shall be constructed in accordance with Section G2427.5 and Chapter 10.
Chimneys and vents shall be sized in accordance with Sections G2427 and G2428.
Abandoned inlet openings in chimneys and vents shall be closed by an approved method.
Where an appliance equipped with a mechanical forced draft system creates a positive pressure in the venting system, the venting system shall be designed for positive pressure applications.
Connection of appliances to chimney flues serving fireplaces shall be in accordance with Sections G2425.7.1 through G2425.7.3.
A noncombustible seal shall be provided below the point of connection to prevent entry of room air into the flue. Means shall be provided for access to the flue for inspection and cleaning.
An appliance shall not be connected to a flue serving a factory-built fireplace unless the appliance is specifically listed for such installation. The connection shall be made in accordance with the appliance manufacturer’s installation instructions.
A connector shall extend from the appliance to the flue serving a masonry fireplace such that the flue gases are exhausted directly into the flue. The connector shall be accessible or removable for inspection and cleaning of both the connector and the flue. Listed direct connection devices shall be installed in accordance with their listing.

The following appliances shall not be required to be vented:

1. Ranges.

2. Built-in domestic cooking units listed and marked for optional venting.

3. Hot plates and laundry stoves.

4. Type 1 clothes dryers (Type 1 clothes dryers shall be exhausted in accordance with the requirements of Section G2439).

5. Refrigerators.

6. Counter appliances.

7. Room heaters listed for unvented use.

Where the appliances listed in Items 5 through 7 above are installed so that the aggregate input rating exceeds 20 Btu per hour per cubic foot (207 W/m3) of volume of the room or space in which such appliances are installed, one or more shall be provided with venting systems or other approved means for conveying the vent gases to the outdoor atmosphere so that the aggregate input rating of the remaining unvented appliances does not exceed 20 Btu per hour per cubic foot (207 W/m3). Where the room or space in which the appliance is installed is directly connected to another room or space by a doorway, archway or other opening of comparable size that cannot be closed, the volume of such adjacent room or space shall be permitted to be included in the calculations.

Connectors shall connect to a masonry chimney flue at a point not less than 12 inches (305 mm) above the lowest portion of the interior of the chimney flue.
Appliance connections to a chimney or vent equipped with a power exhauster shall be made on the inlet side of the exhauster. Joints on the positive pressure side of the exhauster shall be sealed to prevent flue-gas leakage as specified by the manufacturer’s installation instructions for the exhauster.
Masonry chimneys utilized to vent appliances shall be located, constructed and sized as specified in the manufacturer’s installation instructions for the appliances being vented and Section G2427.

Flue lining systems for use with residential-type and low-heat appliances shall be limited to the following:

1. Clay flue lining complying with the requirements of ASTM C 315 or equivalent. Clay flue lining shall be installed in accordance with Chapter 10.

2. Listed chimney lining systems complying with UL 1777.

3. Other approved materials that will resist, without cracking, softening or corrosion, flue gases and condensate at temperatures up to 1,800°F (982°C).

Flue lining systems for use with Category I appliances shall be limited to the following:

1. Flue lining systems complying with Section G2425.12.

2. Chimney lining systems listed and labeled for use with appliances with draft hoods and other Category I gas appliances listed and labeled for use with Type B vents.

The design, sizing and installation of vents for Category II, III and IV appliances shall be in accordance with the appliance manufacturer’s installation instructions.
Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections G2425.15.1 through G2425.15.4.
The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For Category I appliances, the resizing shall be in accordance with Section G2426.
The flue gas passageway shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations, or other damage or deterioration that would allow the escape of combustion products, including gases, moisture and creosote.
Masonry chimney flues shall be provided with a cleanout opening having a minimum height of 6 inches (152 mm). The upper edge of the opening shall be located not less than 6 inches (152 mm) below the lowest chimney inlet opening. The cleanout shall be provided with a tight-fitting, noncombustible cover.

Chimneys and vents shall have airspace clearance to combustibles in accordance with Chapter 10 and the chimney or vent manufacturer’s installation instructions.

Exception: Masonry chimneys without the required air-space clearances shall be permitted to be used if lined or relined with a chimney lining system listed for use in chimneys with reduced clearances in accordance with UL 1777. The chimney clearance shall be not less than that permitted by the terms of the chimney liner listing and the manufacturer’s instructions.

Noncom- bustible fireblocking shall be provided in accordance with Chapter 10.
All vents, except as provided in Section G2427.7, shall be listed and labeled. Type B and BW vents shall be tested in accordance with UL 441. Type L vents shall be tested in accordance with UL 641. Vents for Category II and III appliances shall be tested in accordance with UL 1738. Plastic vents for Category IV appliances shall not be required to be listed and labeled where such vents are as specified by the appliance manufacturer and are installed in accordance with the appliance manufacturer’s installation instructions.
Connectors shall be used to connect appliances to the vertical chimney or vent, except where the chimney or vent is attached directly to the appliance. Vent connector size, material, construction and installation shall be in accordance with Section G2427.
The application of vents shall be in accordance with Table G2427.4.
Where vents pass through insulated assemblies, an insulation shield constructed of steel having a minimum thickness of 0.0187 inch (0.4712 mm) (26 gage) shall be installed to provide clearance between the vent and the insulation material. The clearance shall not be less than the clearance to combustibles specified by the vent manufacturer’s installation instructions. Where vents pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the insulation materials and shall be secured in place to prevent displacement. Insulation shields provided as part of a listed vent system shall be installed in accordance with the manufacturer’s installation instructions.
Vent systems shall be sized, installed and terminated in accordance with the vent and appliance manufacturer’s installation instructions and Section G2427.
All portions of vents shall be adequately supported for the design and weight of the materials employed.
In concealed locations, where a vent is installed through holes or notches in studs, joists, rafters or similar members less than 11/2 inches (38 mm) from the nearest edge of the member, the vent shall be protected by shield plates. Protective steel shield plates having a minimum thickness of 0.0575-inch (1.463 mm) (16 gage) shall cover the area of the vent where the member is notched or bored and shall extend a minimum of 4 inches (102 mm) above sole plates, below top plates and to each side of a stud, joist or rafter.
This section recognizes that the choice of venting materials and the methods of installation of venting systems are dependent on the operating characteristics of the appliance being vented. The operating characteristics of vented appliances can be categorized with respect to: (1) positive or negative pressure within the venting system; and (2) whether or not the appliance generates flue or vent gases that might condense in the venting system. See Section G2403 for the definitions of these vented appliance categories.
Except as permitted in Sections G2427.2.1, G2427.2.2 and G2425.8, all appliances shall be connected to venting systems.
Listed direct-vent appliances shall be installed in accordance with the manufacturer’s instructions and Section G2427.8, Item 3.
Appliances incorporating integral venting means shall be considered properly vented where installed in accordance with the manufacturer’s instructions and Section G2427.8, Items 1 and 2.
A venting system shall be designed and constructed so as to develop a positive flow adequate to convey flue or vent gases to the outdoors.
A venting system shall satisfy the draft requirements of the appliance in accordance with the manufacturer’s instructions.
Appliances required to be vented shall be connected to a venting system designed and installed in accordance with the provisions of Sections G2427.4 through G2427.16.

Mechanical draft systems shall comply with the following:

1. Mechanical draft systems shall be listed and shall be installed in accordance with the manufacturer’s installation instructions for both the appliance and the mechanical draft system.

2. Appliances, except incinerators, requiring venting shall be permitted to be vented by means of mechanical draft systems of either forced or induced draft design.

3. Forced draft systems and all portions of induced draft systems under positive pressure during operation shall be designed and installed so as to prevent leakage of flue or vent gases into a building.

4. Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.

5. Where a mechanical draft system is employed, provisions shall be made to prevent the flow of gas to the main burners when the draft system is not performing so as to satisfy the operating requirements of the appliance for safe performance.

6. The exit terminals of mechanical draft systems shall be not less than 7 feet (2134 mm) above finished ground level where located adjacent to public walkways and shall be located as specified in Section G2427.8, Items 1 and 2.

Venting systems shall not extend into or pass through any fabricated air duct or furnace plenum.

Where a venting system passes through an above-ceiling air-handling space or other nonducted portion of an air-handling system, the venting system shall conform to one of the following requirements:

1. The venting system shall be a listed special gas vent; other venting system serving a Category III or Category IV appliance; or other positive pressure vent, with joints sealed in accordance with the appliance or vent manufacturer’s instructions.

2. The venting system shall be installed such that fittings and joints between sections are not installed in the above-ceiling space.

3. The venting system shall be installed in a conduit or enclosure with sealed joints separating the interior of the conduit or enclosure from the ceiling space.

The type of venting system to be used shall be in accordance with Table G2427.4.

TABLE G2427.4
TYPE OF VENTING SYSTEM TO BE USED

APPLIANCES

TYPE OF VENTING SYSTEM

Listed Category I appliances

Listed appliances equipped with draft hood

Appliances listed for use with Type B gas vent

Type B gas vent (Section G2427.6)

Chimney (Section G2427.5)

Single-wall metal pipe (Section G2427.7)

Listed chimney lining system for gas venting (Section G2427.5.2)

Special gas vent listed for these appliances (Section G2427.4.2)

Listed vented wall furnaces

Type B-W gas vent (Sections G2427.6, G2436)

Category II appliances

As specified or furnished by manufacturers of listed appliances (Sections G2427.4.1, G2427.4.2)

Category III appliances

As specified or furnished by manufacturers of listed appliances (Sections G2427.4.1, G2427.4.2)

Category IV appliances

As specified or furnished by manufacturers of listed appliances (Sections G2427.4.1, G2427.4.2)

Unlisted appliances

Chimney (Section G2427.5)

Decorative appliances in vented fireplaces

Chimney

Direct-vent appliances

See Section G2427.2.1

Appliances with integral vent

See Section G2427.2.2

Plastic piping used for venting appliances listed for use with such venting materials shall be approved.
Plastic pipe and fittings used to vent appliances shall be installed in accordance with the appliance manufacturer’s installation instructions. Where a primer is required, it shall be of a contrasting color.