CODES

ADOPTS WITH AMENDMENTS:

2018 Uniform Mechanical Code

Heads up: There are no suggested sections in this chapter.
Heads up: There are no amended sections in this chapter.
CALIFORNIA MECHANICAL CODE - MATRIX ADOPTION TABLE
CHAPTER 13 - FUEL GAS PIPING
(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
Adopting agency BSC BSC-CG SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC
1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5
Adopt entire chapter X X X X X X X X X X X X
Adopt entire chapter as
amended (amended
sections listed below)
Adopt only those sections
that are listed below
Chapter / Section
This state agency does not adopt sections identified with the following symbol:
The Office of the State Fire Marshal's adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.
The regulations of this chapter shall govern the installation of fuel gas piping in or in connection with a building, structure or within the property lines of premises up to 5 pounds-force per square inch (psi) (34 kPa) for natural gas and 10 psi (69 kPa) for undiluted propane, other than service pipe. Fuel oil piping systems shall be installed in accordance with NFPA 31.
Coverage of piping systems shall extend from the point of delivery to the appliance connections. For other than undiluted liquefied petroleum gas (LP-Gas) systems, the point of delivery shall be the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where no meter is provided. For undiluted LP-Gas systems, the point of delivery shall be considered to be the outlet of the final pressure regulator, exclusive of line gas regulators where no meter is installed. Where a meter is installed, the point of delivery shall be the outlet of the meter. [NFPA 54: 1.1.1.1(A)]
Requirements for piping systems shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation, and maintenance. [NFPA 54:1.1.1.1(C)]
This code shall not apply to the following items (reference standards for some of which appear in Chapter 17):
  1. Portable LP-Gas appliances and equipment of all types that are not connected to a fixed fuel piping system.
  2. Installation of appliances such as brooders, dehydrators, dryers, and irrigation equipment used for agricultural purposes.
  3. Raw material (feedstock) applications except for piping to special atmosphere generators.
  4. Oxygen-fuel gas cutting and welding systems.
  5. Industrial gas applications using such gases as acetylene and acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen, and nitrogen.
  6. Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms, and natural gas processing plants.
  7. Large integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by chemical reactions or used in chemical reactions.
  8. LP-Gas installations at utility gas plants.
  9. Liquefied natural gas (LNG) installations.
  10. Fuel gas piping in electric utility power plants.
  11. Proprietary items of equipment, apparatus, or instruments such as gas-generating sets, compressors, and calorimeters.
  12. LP-Gas equipment for vaporization, gas mixing, and gas manufacturing.
  13. LP-Gas piping for buildings under construction or renovations that is not to become part of the permanent building piping system-that is, temporary fixed piping for building heat.
  14. Installation of LP-Gas systems for railroad switch heating.
  15. Installation of LP-Gas and compressed natural gas (CNG) systems on vehicles.
  16. Gas piping, meters, gas-pressure regulators, and other appurtenances used by the serving gas supplier in distribution of gas, other than undiluted LP-Gas.
  17. Building design and construction, except as specified herein.
  18. Fuel gas systems on recreational vehicles manufactured in accordance with NFPA 1192.
  19. Fuel gas systems using hydrogen as a fuel.
  20. Construction of appliances. [NFPA 54:1.1.1.2]
Upon completion of the installation, alteration, or repair of gas piping, and prior to the use thereof, the Authority Having Jurisdiction shall be notified that such gas piping is ready for inspection.
Excavations required for the installation of underground piping shall be kept open until such time as the piping has been inspected and approved. Where such piping is covered or concealed before such approval, it shall be exposed upon the direction of the Authority Having Jurisdiction.
The Authority Having Jurisdiction shall make the following inspections and either shall approve that portion of the work as completed or shall notify the permit holder wherein the same fails to be in accordance with this code.
This inspection shall be made after gas piping authorized by the permit has been installed before such piping has been covered or concealed, or before fixture or appliance has been attached thereto. This inspection shall include a determination that the gas piping size, material, and installation meet the requirements of this code.
This inspection shall be made after piping authorized by the permit has been installed and after portions thereof that are to be covered or concealed are so concealed and before fixture, appliance, or shutoff valve has been attached thereto. This inspection shall comply with Section 1313.1. Test gauges used in conducting tests shall be in accordance with Section 1303.3.3 through Section 1303.3.3.4.
Tests required by this code, which are performed utilizing dial gauges, shall be limited to gauges having the following pressure graduations or increments.
Required pressure tests of 10 psi (69 kPa) or less shall be performed with gauges of 0.10 psi (0.69 kPa) increments or less.
Required pressure tests exceeding 10 psi (69 kPa) but less than or equal to 100 psi (689 kPa) shall be performed with gauges of 1 psi (7 kPa) increments or less.
Required pressure tests exceeding 100 psi (689 kPa) shall be performed with gauges of 2 percent increments or less of the required test pressure.
Test gauges shall have a pressure range not exceeding twice the test pressure applied.
In cases where the work authorized by the permit consists of a minor installation of additional piping to piping already connected to a gas meter, the foregoing inspections shall be permitted to be waived at the discretion of the Authority Having Jurisdiction. In this event, the Authority Having Jurisdiction shall make such inspection as deemed advisable in order to be assured that the work has been performed in accordance with the intent of this code.
Where upon final piping inspection, the installation is found to be in accordance with the provisions of this code, a certificate of inspection shall be permitted to be issued by the Authority Having Jurisdiction.
A copy of the certificate of such final piping inspection shall be issued to the serving gas supplier supplying gas to the premises.
It shall be unlawful for a serving gas supplier or person furnishing gas, to turn on or cause to be turned on, fuel gas or a gas meter or meters until such certificate of final inspection, as herein provided, has been issued.
It shall be unlawful for a person, firm, or corporation, excepting an authorized agent or employee of a person, firm, or corporation engaged in the business of furnishing or supplying gas and whose service pipes supply or connect with the particular premises, to turn on or reconnect gas service in or on a premises where gas service is, at the time, not being rendered.
It shall be unlawful to turn on or connect gas in or on the premises unless outlets are securely connected to gas appliances or capped or plugged with screw joint fittings.
The Authority Having Jurisdiction or the serving gas supplier is hereby authorized to disconnect gas piping or appliance or both that shall be found not to be in accordance with the requirements of this code or that are found defective and in such condition as to endanger life or property.
Where such disconnection has been made, a notice shall be attached to such gas piping or appliance or both that shall state the same has been disconnected, together with the reasons thereof.
It shall be unlawful to remove or disconnect gas piping or gas appliance without capping or plugging with a screw joint fitting, the outlet from which said pipe or appliance was removed. Outlets to which gas appliances are not connected shall be left capped and gastight on a piping system that has been installed, altered, or repaired.

Exception: Where an approved listed quick-disconnect device is used.
Where temporary use of gas is desired, and the Authority Having Jurisdiction deems the use necessary, a permit shall be permitted to be issued for such use for a period of time not to exceed that designated by the Authority Having Jurisdiction, provided that such gas piping system otherwise is in accordance with to the requirements of this code regarding material, sizing, and safety.
Where required by the Authority Having Jurisdiction, a piping sketch or plan shall be prepared before proceeding with the installation. The plan shall show the proposed location of piping, the size of different branches, the various load demands, and the location of the point of delivery. [NFPA 54:5.1.1]
When additional appliances are being connected to a gas piping system, the existing piping shall be checked to determine whether it has adequate capacity. If inadequate, the existing system shall be enlarged as required, or separate gas piping of adequate capacity shall be provided. [NFPA 54:5.1.2 - 5.1.2.2]
The location of the point of delivery shall be acceptable to the serving gas supplier. [NFPA 54:5.2]
Where two or more meters, or two or more service regulators where meters are not provided, are located on the same premises and supply separate users, the gas piping systems shall not be interconnected on the outlet side of the meters or service regulators. [NFPA 54:5.3.1]
Where a supplementary gas for standby use is connected downstream from a meter or a service regulator where a meter is not provided, equipment to prevent backflow shall be installed. A three-way valve installed to admit the standby supply and at the same time shut off the regular supply shall be permitted to be used for this purpose. [NFPA 54:5.3.2- 5.3.2.2]
Gas piping systems shall be of such size and so installed as to provide a supply of gas to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance. [NFPA 54:5.4.1]
The volumetric flow rate of gas to be provided shall be the sum of the maximum inputs of the appliances served. The volumetric flow rate of gas to be provided shall be adjusted for altitude where the installation is above 2000 feet (610 m). [NFPA 54:5.4.2.1 - 5.4.2.2] Where the input rating is not indicated, the gas supplier, appliance manufacturer, or a qualified agency shall be contacted or the rating from Table 1308.4.1 shall be used for estimating the volumetric flow rate of gas to be supplied.

     The total connected hourly load shall be used as the basis for pipe sizing, assuming all appliances are operating at full capacity simultaneously.

Exception: Sizing shall be permitted to be based upon established load diversity factors. [NFPA 54:5.4.2.3]

TABLE 1308.4.1
APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES
[NFPA 54: TABLE A.5.4.2.1]
APPLIANCE INPUT
(Btu/h approx.)
Space Heating Units
Warm air furnace
     Single family
     Multifamily, per unit
Hydronic boiler
     Single family
     Multifamily, per unit


100000
60000

100000
60000
Space and Water Heating Units
Hydronic boiler
     Single family
     Multifamily, per unit


120000
75000
Water Heating Appliances
Water heater, automatic storage
     30 to 40 gallon tank
Water heater, automatic storage
     50 gallon tank
Water heater, automatic instantaneous
     Capacity at 2 gallons per minute
     Capacity at 4 gallons per minute
     Capacity at 6 gallons per minute
Water heater, domestic, circulating or side-arm


35000

50000

142800
285000
428400
35000
Cooking Appliances
Range, freestanding, domestic
Built-in oven or broiler unit, domestic
Built-in top unit, domestic

65000
25000
40000
Other Appliances
Refrigerator
Clothes dryer, Type I (domestic)
Gas fireplace direct vent
Gas log
Barbecue
Gaslight

3000
35000
40000
80000
40000
2500

For SI units : 1000 British thermal units per hour = 0.293 kW
Gas piping shall be sized in accordance with one of the following:
  1. Pipe sizing tables or sizing equations in this chapter.
  2. Other approved engineering methods acceptable to the Authority Having Jurisdiction.
  3. Sizing tables included in a listed piping system manufacturer's instructions. [NFPA 54:5.4.3]
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. [NFPA 54:5.4.4]
Materials used for piping systems shall either comply with the requirements of this chapter or be acceptable to the Authority Having Jurisdiction. [NFPA 54:5.6.1.1]
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. [NFPA 54:5.6.1.2]
Material not covered by the standards specifications listed herein shall meet the following criteria:
  1. Be investigated and tested to determine that it is safe and suitable for the proposed service.
  2. Be recommended for that service by the manufacturer.
  3. Be acceptable to the Authority Having Jurisdiction. [NFPA 54:5.6.1.3]
Cast-iron pipe shall not be used. [NFPA 54:5.6.2.1]
Steel and wrought-iron pipe shall be not less than standard weight (Schedule 40) and shall comply with one of the following standards:
  1. ASME B36.10
  2. ASTM A53
  3. ASTM A106 [NFPA 54:5.6.2.2]
Copper and copper alloy pipe shall not be used where the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet (set) of gas (0.7 mg/100 L).

     Threaded copper, copper alloy, or aluminum alloy pipe shall not be used with gases corrosive to such material.
Aluminum alloy pipe shall comply with ASTM B241 (except that the use of alloy 5456 is prohibited), and shall be marked at each end of each length indicating compliance. Aluminum alloy pipe shall be coated to protect against external corrosion where it is in contact with masonry, plaster, or insulation or is subject to repeated wettings by such liquids as water, detergents, or sewage. [NFPA 54:5.6.2.5]

     Aluminum alloy pipe shall not be used in exterior locations or underground. [NFPA 54:5.6.2.6]
Seamless copper, aluminum alloy, or steel tubing shall not be used with gases corrosive to such material. [NFPA 54:5.6.3]
Steel tubing shall comply with ASTM A254. [NFPA 54:5.6.3.1]
Copper and copper alloy tubing shall not be used where the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 scf of gas (0.7 mg/100 L). Copper tubing shall comply with standard Type K or L of ASTM B88 or ASTM B280.
Aluminum alloy tubing shall comply with ASTM B210 or ASTM B241. Aluminum alloy tubing shall be coated to protect against external corrosion where it is in contact with masonry, plaster, insulation, or is subject to repeated wettings by such liquids as water, detergent, or sewage. Aluminum alloy tubing shall not be used in exterior locations or underground. [NFPA 54:5.6.3.3]
Corrugated stainless steel tubing shall be listed in accordance with CSA LC-1. [NFPA 54:5.6.3.4]
Polyethylene plastic pipe, tubing, and fittings used to supply fuel gas shall conform to ASTM D2513. Pipe to be used shall be marked "gas" and "ASTM D2513." [NFPA 54:5.6.4.1.1] Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) plastic pipe, tubing, and fittings shall not be used to supply fuel gas. [NFPA 54:5.6.4.1.3]
Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC in accordance with UL 651. PVC vent piping shall not be installed indoors. [NFPA 54:5.6.4.2]
Anodeless risers shall comply with Section 1308.5.4.2.1 through Section 1308.5.4.2.3. [NFPA 54:5.6.4.3]
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. [NFPA 54:5.6.4.3(1)]
Service head adapters and field assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used and shall be design-certified to be in accordance with the requirements of Category I of ASTM D2513. The manufacturer shall provide the user qualified installation instructions. [NFPA 54:5.6.4.3(2)]
The use of plastic pipe, tubing, and fittings in undiluted LP-Gas piping systems shall be in accordance with NFPA 58. [NFPA 54:5.6.4.3(3)]
Gas pipe, tubing, and fittings shall be clear and free from cutting burrs and defects in structure or threading, and shall be thoroughly brushed and chip and scale blown. Defects in pipe, tubing, and fittings shall not be repaired. Defective pipe, tubing, and fittings shall be replaced. [NFPA 54:5.6.5]
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. [NFPA 54:5.6.6]
Metallic pipe and fitting threads shall be taper pipe threads and shall comply with ASME B1.20.1. [NFPA 54:5.6.7.1]
Pipe with threads that are stripped, chipped, corroded, or otherwise damaged shall not be used. Where a weld opens during the operation of cutting or threading, that portion of the pipe shall not be used. [NFPA 54:5.6.7.2]
Field threading of metallic pipe shall be in accordance with Table 1308.5.7.2. [NFPA 54:5.6.7.3]

TABLE 1308.5.7.2
SPECIFICATIONS FOR THREADING METALLIC PIPE
[NFPA 54: TABLE 5.6.7.3]
IRON PIPE SIZE
(inches)
APPROXIMATE LENGTH
OF THREADED PORTION
(inches)
APPROXIMATE
NUMBER OF
THREADS TO BE CUT
1/2 3/4 10
3/4 3/4 10
1 7/8 10
11/4 1 11
11/2 1 11
2 1 11
21/2 11/2 12
3 11/2 12
4 15/8 13

For SI units: 1 inch = 25.4 mm
Thread joint compounds shall be resistant to the action of LP-Gas or to any other chemical constituents of the gases to be conducted through the piping. [NFPA 54:5.6.7.4]
The type of piping joint used shall be suitable for the pressure and 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 the weight of the pipe and its contents. [NFPA 54:5.6.8]
Pipe joints shall be threaded, flanged, brazed, welded, or press-connect fittings made in accordance with CSA LC-4. Where nonferrous pipe is brazed, the brazing materials shall have a melting point in excess of 1000°F (538°C). Brazing alloys shall not contain more than 0.05 percent phosphorus.
Tubing joints shall either be made with approved gas tubing fittings, be brazed with a material having a melting point in excess of 1000°F (538°C), or made by press-connect fittings in accordance with CSA LC-4. Brazing alloys shall not contain more than 0.05 percent phosphorus. [NFPA 54:5.6.8.2]
Flared joints shall be used in systems constructed from nonferrous pipe and tubing where experience or tests have demonstrated that the joint is approved for the conditions and where provisions are made in the design to prevent separation of the joints. [NFPA 54:5.6.8.3]
Metallic pipe fittings shall comply with the following:
  1. Threaded fittings in sizes exceeding 4 inches (100 mm) shall not be used unless acceptable to the Authority Having Jurisdiction.
  2. Fittings used with steel or wrought-iron pipe shall be steel, copper alloy, bronze, malleable iron, or cast-iron.
  3. Fittings used with copper or copper alloy pipe shall be copper or copper alloy.
  4. Fittings used with aluminum alloy pipe shall be of aluminum alloy.
  5. Cast-iron fittings shall comply with the following:
    1. Flanges shall be permitted.
    2. Bushings shall not be used.
    3. Fittings shall not be used in systems containing flammable gas-air mixtures.
    4. Fittings in sizes 4 inches (100 mm) and larger shall not be used indoors unless approved by the Authority Having Jurisdiction.
    5. Fittings in sizes 6 inches (150 mm) and larger shall not be used unless approved by the Authority Having Jurisdiction.
  6. Aluminum alloy fitting threads shall not form the joint seal.
  7. Zinc-aluminum alloy fittings shall not be used in systems containing flammable gas-air mixtures.
  8. Special fittings such as couplings; proprietary-type joints; saddle tees; gland-type compression fittings; and flared, flareless, or compression-type tubing fittings shall be as follows:
    1. Used within the fitting manufacturer's pressure-temperature recommendations.
    2. Used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion, or contraction.
    3. Installed or braced to prevent separation of the joint by gas pressure or external physical damage.
    4. Acceptable to the Authority Having Jurisdiction.
Plastic pipe, tubing, and fittings shall be installed in accordance with the manufacturer's installation instructions. Section 1308.5.9.1 through Section 1308.5.9.4 shall be observed where making such joints. [NFPA 54:5.6.9]
The joint shall be designed and installed so that the longitudinal pullout resistance of the joint will be at least equal to the tensile strength of the plastic piping material. [NFPA 54:5.6.9(1)]
Heat-fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gastight joints 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 D2513." [NFPA 54:5.6.9(2)]
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 not less than the outside end of the compression fitting where installed. The stiffener shall be free of rough or sharp edges and shall not be a forced fit in the plastic. Split tubular stiffeners shall not be used. [NFPA 54:5.6.9(3)]
Plastic piping joints and fittings for use in LP-Gas piping systems shall be in accordance with NFPA 58. [NFPA 54:5.6.9(4)]
Cast iron flanges shall be in accordance with ASME B16.1. [NFPA 54:5.6.10.1.1]
Steel flanges shall be in accordance with the following:
  1. ASME B16.5 or
  2. ASME B16.47. [NFPA 54:5.6.10.1.2]
Non-ferrous flanges shall be in accordance with ASME B16.24. [NFPA 54:5.6.10.1.3]
Ductile iron flanges shall be in accordance with ASME B16.42. [NFPA 54:5.6.10.1.4]
Raised-face flanges shall not be joined to flat-faced cast iron, ductile iron or nonferrous material flanges. [NFPA 54:5.6.10.2]
Standard facings shall be permitted for use under this code. Where 150 psi (1034 kPa) steel flanges are bolted to Class 125 cast-iron flanges, the raised face on the steel flange shall be removed. [NFPA 54:5.6.10.3]
Lapped flanges shall be used only aboveground or in exposed locations accessible for inspection. [NFPA 54:5.6.10.4]
The material for gaskets shall be capable of withstanding the design temperature and pressure of the piping system and the chemical constituents of the gas being conducted without change to its chemical and physical properties. The effects of fire exposure to the joint shall be considered in choosing the material. [NFPA 54:5.6.11]
Acceptable materials shall include the following:
  1. Metal (plain or corrugated)
  2. Composition
  3. Aluminum "O" rings
  4. Spiral-wound metal gaskets
  5. Rubber-faced phenolic
  6. Elastomeric [NFPA 54:5.6.11.1]
Metallic flange gaskets shall be in accordance with ASME B16.20. [NFPA 54:5.6.11.2.1]
Non-metallic flange gaskets shall be in accordance with ASME B16.21. [NFPA 54:5.6.11.2.2]
Full-face flange gaskets shall be used with all non-steel flanges. [NFPA 54:5.6.11.3]
When a flange joint is separated, the gasket shall be replaced. [NFPA 54:5.6.11.4]
Gas meters shall be selected for the maximum expected pressure and permissible pressure drop. [NFPA 54:5.7.1]
Gas meters shall be located in ventilated spaces readily accessible for examination, reading, replacement, or necessary maintenance. [NFPA 54:5.7.2.1]
Gas meters shall not be placed where they will be subjected to damage, such as adjacent to a driveway, under a fire escape, in public passages, halls, or where they will be subject to excessive corrosion or vibration. [NFPA 54:5.7.2.2]
Gas meters shall not be located where they will be subjected to extreme temperatures or sudden extreme changes in temperature or in areas where they are subjected to temperatures beyond those recommended by the manufacturer. [NFPA 54:5.7.2.3]
Gas meters shall be supported or connected to rigid piping so as not to exert a strain on the meters. Where flexible connectors are used to connect a gas meter to downstream piping at mobile homes in mobile home parks, the meter shall be supported by a post or bracket placed in a firm footing or by other means providing equivalent support. [NFPA 54:5.7.3]
Meters shall be protected against overpressure, backpressure, and vacuum. [NFPA 54:5.7.4]
Gas piping at multiple meter installations shall be marked by a metal tag or other permanent means designating the building or the part of the building being supplied and attached by the installing agency. [NFPA 54:5.7.5]
A line pressure regulator or gas appliance pressure regulator, as applicable, shall be installed where the gas supply pressure is higher than that at which the branch supply line or appliances are designed to operate or vary beyond design pressure limits. [NFPA 54:5.8.1]
Line pressure regulators shall be listed in accordance with CSA Z21.80. [NFPA 54:5.8.2]
The gas pressure regulator shall be accessible for servicing. [NFPA 54:5.8.3]
Pressure regulators shall be protected against physical damage. [NFPA 54:5.8.4]
Line pressure regulators shall comply with all of the following:
  1. An independent vent to the exterior of the building, sized in accordance with the regulator manufacturer's instructions, shall be provided where the location of a regulator is such that a ruptured diaphragm will cause a hazard. Where more than one regulator is at a location, each regulator shall have a separate vent to the outdoors or, if approved by the Authority Having Jurisdiction, the vent lines shall be permitted to be manifolded in accordance with accepted engineering practices to minimize backpressure in the event of diaphragm failure. Materials for vent piping shall be in accordance with Section 1308.5 through Section 1308.5.11.5.

    Exception: A regulator and vent limiting means combination listed as complying with CSA Z21.80 shall be permitted to be used without a vent to the outdoors.
  2. The vent shall be designed to prevent the entry of water, insects, or other foreign materials that could cause blockage.
  3. The regulator vent shall terminate at least 3 feet (914 mm) from a source of ignition.
  4. At locations where regulators might be submerged during floods, a special antiflood-type breather vent fitting shall be installed, or the vent line shall be extended above the height of the expected flood waters.
  5. A regulator shall not be vented to the appliance flue or exhaust system. [NFPA 54:5.8.5.1]
For venting of gas appliance pressure regulators, see Section 902.15. [NFPA 54:5.8.5.2]
The discharge of vents shall be in accordance with the following:
  1. The discharge stacks, vents, or outlet parts of all pressure-relieving and pressure-limiting devices shall be located so that gas is safely discharged to the outdoors.
  2. Discharge stacks or vents shall be designed to prevent the entry of water, insects, or other foreign material that could cause blockage. The discharge stack or vent line shall be at least the same size as the outlet of the pressure-relieving device. [NFPA 54:5.9.8.1, 5.9.8.2]
Valved and regulated bypasses shall be permitted to be placed around gas line pressure regulators where continuity of service is imperative. [NFPA 54:5.8.6]
Line pressure regulators at multiple regulator installations shall be marked by a metal tag or other permanent means designating the building or the part of the building being supplied. [NFPA 54:5.8.7]
Where the serving gas supplier delivers gas at a pressure greater than 2 psi for piping systems serving appliances designed to operate at a gas pressure of 14 inches water column or less, overpressure protection devices shall be installed. Piping systems serving equipment designed to operate at inlet pressures greater than 14 inches water column (3.5 kPa) shall be equipped with overpressure protection devices as required by the appliance manufacturer's installation instructions. [NFPA 54:5.9.1]
Where piping systems serving appliances designed to operate with a gas supply pressure of 14 inches water column or less are required to be equipped with overpressure protection by Section 1308.8, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance to 2 psi or less upon a failure of the line pressure regulator. [NFPA 54:5.9.2.1]
Where piping systems serving appliances designed to operate with a gas supply pressure greater than 14 inches water column are required to be equipped with overpressure protection by Section 1308.8, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance as required by the appliance manufacturer's installation instructions. [NFPA 54:5.9.2.2]
Each overpressure protection device installed to meet the requirements of this section shall be capable of limiting the pressure to its connected appliance(s) as required by this section independently of any other pressure control equipment in the piping system. [NFPA 54:5.9.2.3]
Each gas piping system for which an overpressure protection device is required by this section shall be designed and installed so that a failure of the primary pressure control device(s) is detectable. [NFPA 54:5.9.2.4]
If a pressure relief valve is used to meet the requirements of this section, it shall have a flow capacity such that the pressure in the protected system is maintained at or below the limits specified in Section 1308.9 under the following conditions:
  1. The line pressure regulator for which the relief valve is providing overpressure protection has failed wide open.
  2. The gas pressure at the inlet of the line pressure regulator for which the relief valve is providing overpressure protection is not less than the regulator's normal operating inlet pressure. [NFPA 54:5.9.2.5]
Protective devices shall be installed as close to the equipment as practical where the design of the equipment connected is such that air, oxygen, or standby gases are capable of being forced into the gas supply system. Gas and air combustion mixers incorporating double diaphragm "zero" or "atmosphere" governors or regulators shall require no further protection unless connected directly to compressed air or oxygen at pressures of 5 psi (34 kPa) or more. [NFPA 54:5.10.1]
Protective devices shall include, but not be limited to the following:
  1. Check valves.
  2. Three-way valves (of the type that completely closes one side before starting to open the other side).
  3. Reverse flow indicators controlling positive shutoff valves.
  4. Normally closed air-actuated positive shutoff pressure regulators. [NFPA 54:5.10.2]
A protective device shall be installed between the meter and the appliance or equipment where the operation of the appliance or equipment is such that it is capable of producing a vacuum or a dangerous reduction in gas pressure at the meter. Such protective devices include, but are not limited to, mechanical, diaphragm-operated, or electrically operated low-pressure shutoff valves. [NFPA 54:5.11]
Shutoff valves shall be approved and shall be selected giving consideration to pressure drop, service involved, emergency use, and reliability of operation. Shutoff valves of size 1 inch (25 mm) National Pipe Thread and smaller shall be listed. [NFPA 54:5.12]
Piping systems shall be designed to prevent failure from thermal expansion or contraction. [NFPA 54:5.14.1]
Where local conditions include earthquake, tornado, unstable ground, or flood hazards, special consideration shall be given to increased strength and flexibility of piping supports and connections. [NFPA 54:5.14.2]
Where automatic excess flow valves are installed, they shall be listed to CSA Z21.93 and shall be sized and installed in accordance with the manufacturer's instructions. [NFPA 54:5.13]
Underground gas piping shall be installed with approved clearance from any other underground structure to avoid contact therewith, to allow maintenance, and to protect against damage from proximity to other structures. In addition, underground plastic piping shall be installed with approved clearance or shall be insulated from any source of heat so as to prevent the heat from impairing the serviceability of the pipe. [NFPA 54:7.1.1]
Underground piping systems shall be installed with a minimum of 12 inches (305 mm) of cover. The minimum cover shall be increased to 18 inches (457 mm) if external damage to the pipe or tubing from external forces is likely to result. Where a minimum of 12 inches (305 mm) of cover cannot be provided, the pipe shall be installed in conduit or bridged (shielded). [NFPA 54:7.1.2.1]
The trench shall be graded so that the pipe has a firm, substantially continuous bearing on the bottom of the trench. [NFPA 54:7.1.2.2]
Where flooding of the trench is done to consolidate the backfill, care shall be exercised to see that the pipe is not floated from its firm bearing on the trench bottom. [NFPA 54:7.1.2.3]
Steel pipe and steel tubing installed underground shall be installed in accordance with Section 1310.1.3.1 through Section 1310.1.3.9. [NFPA 54:7.1.3]
Zinc coating (galvanizing) shall not be deemed adequate protection for underground gas piping. [NFPA 54:7.1.3.1]
Underground piping shall comply with one or more of the following unless approved technical justification is provided to demonstrate that protection is unnecessary:
  1. The piping shall be made of corrosion-resistant material that is suitable for the environment in which it will be installed.
  2. Pipe shall have a factory-applied, electrically insulating coating. Fittings and joints between sections of coated pipe shall be coated in accordance with the coating manufacturer 's instructions.
  3. The piping shall have a cathodic protection system installed, and the system shall be maintained in accordance with Section 1310.1.3.3 or Section 1310.1.3.6. [NFPA 54:7.1.3.2]
Cathodic protection systems shall be monitored by testing and the results shall be documented. The test results shall demonstrate one of the following:
  1. A pipe-to-soil voltage of-0.85 volts or more negative is produced, with reference to a saturated copper-copper sulfate half cell.
  2. A pipe-to-soil voltage of -0.78 volts or more negative is produced, with reference to a saturated KCl calomel half cell.
  3. A pipe-to-soil voltage of-0.80 volts or more negative is produced, with reference to a silver-silver chloride half cell.
  4. Compliance with a method described in Appendix D of Title 49 of the Code of Federal Regulations, Part 192. [NFPA 54:7.1.3.3]
Sacrificial anodes shall be tested in accordance with the following:
  1. Upon installation of the cathodic protection system, except where prohibited by climatic conditions, in which case the testing shall be performed not later than 180 days after the installation of the system.
  2. 12 to 18 months after the initial test.
  3. Upon successful verification testing in accordance with Section 1310.1.3.4(1) and Section 1310.1.3.4(2), periodic follow-up testing shall be performed at intervals not to exceed 36 months. [NFPA 54:7.1.3.4]
Systems failing a test shall be repaired not more than 180 days after the date of the failed testing. The testing schedule shall be restarted as required in Section 1310.1.3.4(1) and Section 1310.1.3.4(2), and the results shall comply with Section 1310.1.3.3. [NFPA 54:7.1.3.5]
Impressed current cathodic protection systems shall be inspected and tested in accordance with the following schedule:
  1. The impressed current rectifier voltage output shall be checked at intervals not exceeding two months.
  2. The pipe-to-soil voltage shall be tested at least annually. [NFPA 54:7.1.3.6]
Documentation of the results of the two most recent tests shall be retained. [NFPA 54:7.1.3.7]
Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used. [NFPA 54:7.1.3.8]
Steel risers, other than anodeless risers, connected to plastic piping shall be cathodically protected by means of a welded anode. [NFPA 54:7.1.3.9]
Where the formation of hydrates or ice is known to occur, piping shall be protected against freezing. [NFPA 54:7.1.4]
Underground piping, where installed through the outer foundation or basement wall of a building shall be encased in a protective sleeve or protected by an approved device or method. The space between the gas piping and the sleeve and between the sleeve and the wall shall be sealed to prevent entry of gas and water. [NFPA 54:7.1.5]
Where gas piping is installed underground beneath buildings, the piping shall be either of the following:
  1. Encased in an approved conduit designed to withstand the imposed loads and installed in accordance with Section 1310.1.6.1 or Section 1310.1.6.2.
  2. A piping/encasement system listed for installation beneath buildings. [NFPA 54:7.1.6]
The conduit shall extend into an accessible 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. Where the end sealing is of a type that retains the full pressure of the pipe, the conduit shall be designed for the same pressure as the pipe. The conduit shall extend at least 4 inches (102 mm) outside the building, be vented outdoors above finished ground level, and be installed so as to prevent the entrance of water and insects. [NFPA 54:7.1.6.1]
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. [NFPA 54:7.1.6.2]
Plastic piping shall be installed outdoors, underground only.

Exceptions:
  1. Plastic piping shall be permitted to terminate aboveground where an anodeless riser is used.
  2. Plastic piping shall be permitted to terminate with a wall head adapter aboveground in buildings, including basements, where the plastic piping is inserted in a piping material permitted for use in buildings. [NFPA 54:7.1.7.1]
Connections made between metallic and plastic piping shall be made with fittings conforming to one of the following:
  1. ASTM D2513 Category I transition fittings
  2. ASTM F1973
  3. ASTM F2509 [NFPA 54:7.1.7.2]
An electrically continuous corrosion-resistant tracer shall be buried with the plastic pipe to facilitate locating. The tracer shall be one of the following:
  1. A product specifically designed for that purpose.
  2. Insulated copper conductor not less than 14 AWG.
     Where tracer wire is used, access shall be provided from aboveground or one end of the tracer wire or tape shall be brought aboveground at a building wall or riser. [NFPA 54:7.1.7.3 - 7.1.7.3.2]
Piping installed aboveground shall be securely supported and located where it will be protected from physical damage. Where passing through an exterior wall, the piping shall also be protected from corrosion by coating or wrapping with an inert material approved for such applications. The piping shall be sealed around its circumference at the point of the exterior penetration to prevent the entry of water, insects, and rodents. Where piping is encased in a protective pipe sleeve, the annular spaces between the gas piping and the sleeve and between the sleeve and the wall opening shall be sealed. [NFPA 54:7.2.1]
The installation of gas piping shall not cause structural stresses within building components to exceed allowable design limits. Approval shall be obtained before any beams or joists are cut or notched. [NFPA 54:7.2.2 - 7.2.2.2]
Piping for other than dry gas conditions shall be sloped not less than 1/4 inch in 15 feet (1.4 mm/m) to prevent traps. [NFPA 54:7.2.3]
Gas piping shall be permitted to be installed in accessible spaces between a fixed ceiling and a dropped ceiling, whether or not such spaces are used as a plenum. Valves shall not be located in such spaces.

Exception: Appliance or equipment shutoff valves required by this code shall be permitted to be installed in accessible spaces containing vented appliances.
Gas piping inside any building shall not be installed in or through a clothes chute, chimney or gas vent, dumbwaiter, elevator shaft, or air duct, other than combustion air ducts. [NFPA 54:7.2.4]

Exception: Ducts used to provide ventilation air in accordance with Section 701.0 or to above-ceiling spaces in accordance with Section 1310.2.2.1.
Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers, or building structural components, approved 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 equipment and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58. [NFPA 54:7.2.5.1]
Spacing of supports in gas piping installations shall not be greater than shown in Table 1310.2.4.1. Spacing of supports of CSST shall be in accordance with the CSST manufacturer's instructions. [NFPA 54:7.2.5.2]

TABLE 1310.2.4.1
SUPPORT OF PIPING
[NFPA 54: TABLE 7.2.5.2]
STEEL PIPE,
NOMINAL SIZE
OF PIPE
(inches)
SPACING OF
SUPPORTS
(feet)
NOMINAL SIZE
OF TUBING
SMOOTH-WALL
(inches 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 units: 1 inch = 25 mm, 1 foot = 304.8 mm
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 system shall be designed and installed so they are not disengaged by movement of the supported piping. [NFPA 54:7.2.5.3]
Gas piping installed on the roof surfaces shall be elevated above the roof surface and shall be supported in accordance with Table 1310.2.4.1. [NFPA 54:7.2.5.4]
Where piping containing gas is to be removed, the line shall be first disconnected from sources of gas and then thoroughly purged with air, water, or inert gas before cutting or welding is done.
Gas piping in concealed locations shall be installed in accordance with this section. [NFPA 54:7.3.1]
Where gas piping is to be concealed, connections shall be of the following type:
  1. Pipe fittings, such as elbows, tees, couplings, and right/left nipple/couplings.
  2. Joining tubing by brazing (see Section 1308.5.8.2).
  3. Fittings listed for use in concealed spaces or that have been demonstrated to sustain, without leakage, forces due to temperature expansion or contraction, vibration, or fatigue based on their geographic location, application, or operation.
  4. Where necessary to insert fittings in gas pipe that has been installed in a concealed location, the pipe shall be reconnected by welding, flanges, or the use of a right/left nipple/coupling.
Concealed gas piping shall not be located in solid partitions. [NFPA 54:7.3.3]
This provision shall not apply to tubing that pierces walls, floors, or partitions. Tubing installed vertically and horizontally inside hollow walls or partitions without protection along its entire concealed length shall meet the following requirements:
  1. A steel striker barrier not less than 0.0508 of an inch (1.3 mm) thick, or equivalent, is installed between the tubing and the finished wall and extends at least 4 inches (102 mm) beyond concealed penetrations of plates, firestops, wall studs, and so on.
  2. The tubing is installed in single runs and is not rigidly secured. [NFPA 54:7.3.4]
In industrial occupancies, gas piping in solid floors such as concrete shall be laid in channels in the floor and covered to permit access to the piping with a minimum of damage to the building. Where piping in floor channels could be exposed to excessive moisture or corrosive substances, the piping shall be protected in an approved manner. [NFPA 54:7.3.5.1]

Exception: In other than industrial occupancies and where approved by the Authority Having Jurisdiction, gas piping embedded in concrete floor slabs constructed with portland cement shall be surrounded with a minimum of 1 1/2 inches (38 mm) of concrete and shall not be in physical contact with other metallic structures such as reinforcing rods or electrically neutral conductors. All piping, fittings, and risers shall be protected against corrosion in accordance with Section 1308.5.6. Piping shall not be embedded in concrete slabs containing quick-set additives or cinder aggregate. [NFPA 54:7.3.5.2]
Where gas piping exceeding 5 psi (34 kPa) is located within vertical chases in accordance with Section 1310.5(2), the requirements of Section 1310.4.1 through Section 1310.4.3 shall apply. [NFPA 54:7.4]
Where pressure reduction is required in branch connections for compliance with Section 1310.5, such reduction shall take place either inside the chase or immediately adjacent to the outside wall of the chase. Regulator venting and downstream overpressure protection shall comply with Section 1308.7.4 and Section 1308.8 through Section 1308.9.4. The regulator shall be accessible for service and repair, and vented in accordance with one of the following:
  1. Where the fuel gas is lighter than air, regulators equipped with a vent limiting means shall be permitted to be vented into the chase. Regulators not equipped with a vent limiting means shall be permitted to be vented either directly to the outdoors or to a point within the top 1 foot (305 mm) of the chase.
  2. Where the fuel gas is heavier than air, the regulator vent shall be vented only directly to the outdoors. [NFPA 54:7.4.1]
Chase construction shall comply with local building codes with respect to fire resistance and protection of horizontal and vertical openings. [NFPA 54:7.4.2]
A chase shall be ventilated to the outdoors and only at the top. The opening(s) shall have a minimum free area [in square inches (square meters)] equal to the product of one-half of the maximum pressure in the piping [in pounds per square inch (kilopascals)] times the largest nominal diameter of that piping [in inches (millimeters)], or the cross-sectional area of the chase, whichever is smaller. Where more than one fuel gas piping system is present, the free area for each system shall be calculated and the largest area used. [NFPA 54:7.4.3]
The maximum design operating pressure for piping systems located inside buildings shall not exceed 5 psi (34 kPa) unless one or more of the following conditions are met:
  1. The piping system is welded.
  2. The piping is located in a ventilated chase or otherwise enclosed for protection against accidental gas accumulation.
  3. The piping is located inside buildings or separate areas of buildings used exclusively for one of the following:
    1. Industrial processing or heating
    2. Research
    3. Warehousing
    4. Boiler or mechanical rooms
  4. The piping is a temporary installation for buildings under construction.
  5. The piping serves appliances or equipment used for agricultural purposes.
  6. The piping system is an LP-Gas piping system with a design operating pressure greater than 20 psi (138 kPa) and complies with NFPA 58. [NFPA 54:5.5.1]
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 to prevent LP-Gas vapor from condensing back into a liquid. [NFPA 54:5.5.2]
The maximum operating pressure for piping systems serving appliances designed to operate at 14 inches water column (3.5 kPa) inlet pressure or less shall be 2 pounds-force per square inch gauge (psig) (14 kPa) unless an over pressure protection device designed to limit pressure at the appliance to 2 psig (14 kPa) upon failure of the line gas pressure regulator is installed.
Changes in direction of gas pipe shall be made by the use of fittings, factory bends, or field bends. [NFPA 54:7.5]
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.
  5. The inside radius of a bend shall be not less than six times the outside diameter of the pipe. [NFPA 54:7.5.1]
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. [NFPA 54:7.5.2]
Factory-made welding elbows or transverse segments cut therefrom shall have an arc length measured along the crotch of at least 1 inch (25 mm) for pipe sizes 2 inches (50 mm) and larger. [NFPA 54:7.5.3]
For other than dry gas conditions, a drip shall be provided at any point in the line of pipe where condensate could collect. Where required by the Authority Having Jurisdiction or the serving gas supplier, a drip shall also be provided at the outlet of the meter. This drip shall be installed so as to constitute a trap wherein an accumulation of condensate shuts off the flow of gas before it runs back into the meter. [NFPA 54:7.6.1]
All drips shall be installed only in such locations that they are readily accessible to permit cleaning or emptying. A drip shall not be located where the condensate is likely to freeze. [NFPA 54:7.6.2]
The installation of sediment traps shall be in accordance with Section 1312.9. [NFPA 54:7.6.3]
Outlets shall be located and installed in accordance with the following requirements:
  1. The outlet fittings or piping shall be securely fastened in place.
  2. Outlets shall not be located behind doors.
  3. Outlets shall be located far enough from floors, walls, patios, slabs, and ceilings to permit the use of wrenches without straining, bending, or damaging the piping.
  4. The unthreaded portion of gas piping outlets shall extend not less than 1 inch (25.4 mm) through finished ceilings or indoor or outdoor walls.
  5. The unthreaded portion of gas piping outlets shall extend not less than 2 inches (51 mm) above the surface of floors or outdoor patios or slabs.
  6. The provisions of Section 1310.9(4) and Section 1310.9(5) shall not apply to listed quick-disconnect devices of the flush-mounted type or listed gas convenience outlets. Such devices shall be installed in accordance with the manufacturer's installation instructions. [NFPA 54:7.7.1.1 -7.7.1.6]
Each outlet, including a valve, shall be closed gastight with a threaded plug or cap immediately after installation and shall be left closed until the appliance or equipment is connected thereto. When an appliance or equipment is disconnected from an outlet and the outlet is not to be used again immediately, it shall be capped or plugged gastight.

Exceptions:
  1. Laboratory appliances installed in accordance with Section 1312.3.1 shall be permitted.
  2. The use of a listed quick-disconnect device with integral shutoff or listed gas convenience outlet shall be permitted. [NFPA 54:7.7.2.1]
Appliance shutoff valves installed in fireplaces shall be removed and the piping capped gastight where the fireplace is used for solid-fuel burning. [NFPA 54:7.7.2.2]
When a branch outlet is placed on a main supply line before it is known what size pipe will be connected to it, the outlet shall be of the same size as the line that supplies it. [NFPA 54:7.8]
An accessible gas shutoff valve shall be provided upstream of each gas pressure regulator. Where two gas pressure regulators are installed in series in a single gas line, a manual valve shall not be required at the second regulator. [NFPA 54:7.9.1]
Main gas shutoff valves controlling several gas piping systems shall be readily accessible for operation and installed so as to be protected from physical damage. They shall be marked with a metal tag or other permanent means attached by the installing agency so that the gas piping systems supplied through them can be readily identified. [NFPA 54:7.9.2.1]
In multiple-tenant buildings supplied through a master meter, through one service regulator where a meter is not provided, or where meters or service regulators are not readily accessible from the appliance or equipment location, an individual shutoff valve for each apartment or tenant line shall be provided at a convenient point of general accessibility. In a common system serving a number of individual buildings, shutoff valves shall be installed at each building. [NFPA 54:7.9.2.2]
An exterior shutoff valve to permit turning off the gas supply to each building in an emergency shall be provided. The emergency shutoff valves shall be plainly marked as such and their locations posted as required by the Authority Having Jurisdiction. [NFPA 54:7.9.2.3]
Each laboratory space containing two or more gas outlets installed on tables, benches, or in hoods in educational, research, commercial and industrial occupancies shall have a single shutoff valve through which all such gas outlets are supplied. The shutoff valve shall be accessible, located within the laboratory or adjacent to the laboratory's egress door, and identified. [NFPA 54:7.9.2.4]
No device shall be placed inside the gas piping or fittings that reduces the cross-sectional area or otherwise obstructs the free flow of gas, except where proper allowance in the piping system design has been made for such a device and where approved by the Authority Having Jurisdiction. [NFPA 54:7.10]
Where gas-air mixing machines are employed to produce mixtures above or below the flammable range, they shall be provided with stops to prevent adjustment of the mixture to within or approaching the flammable range. [NFPA 54:7.11]
Systems containing flammable gas-air mixtures shall be in accordance with Section 1310.14.1 through Section 1310.14.6.
A central premix system with a flammable mixture in the blower or compressor shall consist of the following components:
  1. Gas-mixing machine in the form of an automatic gas-air proportioning device combined with a downstream blower or compressor.
  2. Flammable mixture piping, minimum Schedule 40.
  3. Automatic firecheck(s).
  4. Safety blowout(s) or backfire preventers for systems utilizing flammable mixture lines above 2 1/2 inches (64 mm) nominal pipe size or the equivalent. [NFPA 54:7.12.1]
The following components shall also be permitted to be utilized in any type of central premix system:
  1. Flowmeter(s)
  2. Flame arrester(s) [NFPA 54:7.12.2]
Gas-mixing machines shall have nonsparking blowers and shall be constructed so that a flashback does not rupture machine casings. [NFPA 54:7.12.3]
A mixing blower system shall be limited to applications with minimum practical lengths of mixture piping, limited to a maximum mixture pressure of 10 inches water column (2.5 kPa) and limited to gases containing no more than 10 percent hydrogen.

     The blower shall be equipped with a gas-control valve at its air entrance arranged so that gas is admitted to the airstream, entering the blower in proper proportions for correct combustion by the type of burners employed, the said gas-control valve being of either the zero governor or mechanical ratio valve type that controls the gas and air adjustment simultaneously. No valves or other obstructions shall be installed between the blower discharge and the burner or burners. [NFPA 54:7.12.4]
Installation of gas-mixing machines shall comply with the following:
  1. The gas-mixing machine shall be located in a well-ventilated area or in a detached building or cutoff room provided with room construction and explosion vents in accordance with sound engineering principles. Such rooms or below-grade installations shall have adequate positive ventilation.
  2. Where gas-mixing machines are installed in well-ventilated areas, the type of electrical equipment shall be in accordance with the California Electrical Code, for general service conditions unless other hazards in the area prevail. Where gas-mixing machines are installed in small detached buildings or cutoff rooms, the electrical equipment and wiring shall be installed in accordance with the California Electrical Code for hazardous locations (Articles 500 and 501, Class I, Division 2).
  3. Air intakes for gas-mixing machines using compressors or blowers shall be taken from outdoors whenever practical.
  4. Controls for gas-mixing machines shall include interlocks and a safety shutoff valve of the manual reset type in the gas supply connection to each machine arranged to automatically shut off the gas supply in the event of high or low gas pressure. Except for open-burner installations only, the controls shall be interlocked so that the blower or compressor stops operating following a gas supply failure. Where a system employs pressurized air, means shall be provided to shut off the gas supply in the event of air failure.
  5. Centrifugal gas-mixing machines in parallel shall be reviewed by the user and equipment manufacturer before installation, and means or plans for minimizing the effects of downstream pulsation and equipment overload shall be prepared and utilized as needed. [NFPA 54:7.12.5.1 - 7.12.5.5]
Automatic firechecks and safety blowouts or backfire preventers shall be provided in piping systems distributing flammable air-gas mixtures from gas-mixing machines to protect the piping and the machines in the event of flashback, in accordance with the following:
  1. Approved automatic firechecks shall be installed upstream as close as practical to the burner inlets following the firecheck manufacturer's instructions.
  2. A separate manually operated gas valve shall be provided at each automatic firecheck for shutting off the flow of the gas-air mixture through the firecheck after a flashback has occurred. The valve shall be located upstream as close as practical to the inlet of the automatic firecheck.

    Caution: These valves shall not be reopened after a flashback has occurred until the firecheck has cooled sufficiently to prevent re-ignition of the flammable mixture and has been reset properly.
  3. A safety blowout or backfiring preventer shall be provided in the mixture line near the outlet of each gas-mixing machine where the size of the piping is larger than 2 1/2 inches (65 mm) NPS, or equivalent, to protect the mixing equipment in the event of an explosion passing through an automatic firecheck. The manufacturer's instructions shall be followed when installing these devices, particularly after a disc has burst. The discharge from the safety blowout or backfire preventer shall be located or shielded so that particles from the ruptured disc cannot be directed towards personnel. Wherever there are interconnected installations of gas-mixing machines with safety blowouts or backfire preventers, provision shall be made to keep the mixture from other machines from reaching any ruptured disc opening. Check valves shall not be used for this purpose.
  4. Large-capacity premix systems provided with explosion heads (rupture discs) to relieve excessive pressure in pipelines shall be located at and vented to a safe outdoor location. Provisions shall be provided for automatically shutting off the supply of the gas-air mixture in the event of rupture. [NFPA 54:7.12.6]
Each aboveground portion of a gas piping system other than 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 when it is connected to appliances that are connected to the appliance grounding conductor of the circuit supplying that appliance. [NFPA 54:7.13.1]
CSST gas piping systems, and gas piping systems containing one or more segments of CSST, shall be bonded to the electrical service grounding electrode system or, where provided, lightning protection grounding electrode system. [NFPA 54:7.13.2]
The bonding jumper shall connect to a metallic pipe, pipe fitting, or CSST fitting. [NFPA 54:7.13.2.1]
The bonding jumper shall not be smaller than 6 AWG copper wire or equivalent. [NFPA 54:7.13.2.2]
The length of the jumper between the connection to the gas piping system and the grounding electrode system shall not exceed 75 feet (22860 mm). Any additional electrodes shall be bonded to the electrical service grounding electrode system or, where provided, lightning protection grounding electrode system. [NFPA 54:7.13.2.3]
Bonding connections shall be in accordance with the California Electrical Code. [NFPA 54:7.13.2.4]
Devices used for the bonding connection shall be listed for the application in accordance with UL 467. [NFPA 54:7.13.2.5]
Gas piping shall not be used as a grounding conductor or electrode. [NFPA 54:7.13.3]
Where a lightning protection system is installed, the bonding of the gas piping shall be in accordance with NFPA 780. [NFPA 54:7.13.4]
Electrical circuits shall not utilize gas piping or components as conductors.

Exception: Low-voltage (50V or less) control circuits, ignition circuits, and electronic flame detection device circuits shall be permitted to make use of piping or components as a part of an electric circuit. [NFPA 54:7.14]
All electrical connections between wiring and electrically operated control devices in a piping system shall conform to the requirements of the California Electrical Code. [NFPA 54:7.15.1]
Any essential safety control depending on electric current as the operating medium shall be of a type that shuts off (fail safe) the flow of gas in the event of current failure. [NFPA 54:7.15.2]
Appliances and equipment shall be connected to the building piping in compliance with Section 1312.6 through Section 1312.8 by one of the following:
  1. Rigid metallic pipe and fittings.
  2. Semirigid metallic tubing and metallic fittings. Aluminum alloy tubing shall not be used in exterior locations.
  3. A listed connector in compliance with CSA Z21.24. The connector shall be used in accordance with the manufacturer's installation instructions and shall be in the same room as the appliance. Only one connector shall be used per appliance.
  4. A listed connector in compliance with CSA Z21.75. Only one connector shall be used per appliance.
  5. CSST where installed in accordance with the manufacturer's installation instructions.
  6. Listed nonmetallic gas hose connectors in accordance with Section 1312.3.
  7. Unlisted gas hose connectors for use in laboratories and educational facilities in accordance with Section 1312.4. [NFPA 54:9.6.1]
Connectors used with commercial cooking appliances that are moved for cleaning and sanitation purposes shall be installed in accordance with the connector manufacturer's installation instructions. Such connectors shall be listed in accordance with CSA Z21.69. [NFPA 54:9.6.1.3]
Movement of appliances with casters shall be limited by a restraining device installed in accordance with the connector and appliance manufacturer's installation instructions. [NFPA 54:9.6.1.4]
Suspended low-intensity infrared tube heaters shall be connected to the building piping system with a connector listed for the application in accordance with CSA Z21.24 as follows:
  1. The connector shall be installed in accordance with the tube heater installation instructions, and shall be in the same room as the appliance.
  2. Only one connector shall be used per appliance. [NFPA 54:9.6.1.5]
Listed gas hose connectors shall be used in accordance with the manufacturer's installation instructions and in accordance with Section 1312.3.1 or Section 1312.3.2. [NFPA 54:9.6.2]
Indoor gas hose connectors shall be used only to connect laboratory, shop, and ironing appliances requiring mobility during operation and installed in accordance with the following:
  1. An appliance shutoff valve shall be installed where the connector is attached to the building piping.
  2. The connector shall be of minimum length and shall not exceed 6 feet (1829 mm).
  3. The connector shall not be concealed and shall not extend from one room to another or pass through wall partitions, ceilings, or floors. [NFPA 54:9.6.2(1)]
Where outdoor gas hose connectors are used to connect portable outdoor appliances, the connector shall be listed in accordance with CSA Z21.54 and installed in accordance with the following:
  1. An appliance shutoff valve, a listed quick-disconnect device, or a listed gas convenience outlet shall be installed where the connector is attached to the supply piping and in such a manner so as to prevent the accumulation of water or foreign matter.
  2. This connection shall be made only in the outdoor area where the appliance is to be used. [NFPA 54:9.6.2(2)]
  3. The connector length shall not exceed 15 feet (4572 mm).
Injection (Bunsen) burners used in laboratories and educational facilities shall be permitted to be connected to the gas supply by an unlisted hose. [NFPA 54:9.6.3]
Where portable industrial appliances or appliances requiring mobility or subject to vibration are connected to the building gas piping system by the use of a flexible hose, the hose shall be suitable and safe for the conditions under which it can be used. [NFPA 54:9.6.4.1]
Where industrial appliances requiring mobility are connected to the rigid piping by the use of swivel joints or couplings, the swivel joints or couplings shall be suitable for the service required and only the minimum number required shall be installed. [NFPA 54:9.6.4.2]
Where industrial appliances subject to vibration are connected to the building piping system by the use of all metal flexible connectors, the connectors shall be suitable for the service required. [NFPA 54:9.6.4.3]
Where flexible connections are used, they shall be of the minimum practical length and shall not extend from one room to another or pass through any walls, partitions, ceilings, or floors. Flexible connections shall not be used in any concealed location. They shall be protected against physical or thermal damage and shall be provided with gas shutoff valves in readily accessible locations in rigid piping upstream from the flexible connections. [NFPA 54:9.6.4.4]
Each appliance connected to a piping system shall have an accessible, approved manual shutoff valve with a nondisplaceable valve member, or a listed gas convenience outlet. Appliance shutoff valves and convenience outlets shall serve a single appliance only. The shutoff valve shall be located within 6 feet (1829 mm) of the appliance it serves. Where a connector is used, the valve shall be installed upstream of the connector. A union or flanged connection shall be provided downstream from the valve to permit removal of appliance controls. Shutoff valves serving decorative appliances shall be permitted to be installed in fireplaces if listed for such use. [NFPA 54:9.6.5, 9.6.5.1(A)(B)]

Exceptions:
  1. Shutoff valves shall be permitted to be accessibly located inside or under an appliance where such appliance is removed without removal of the shutoff valve.
  2. Shutoff valves shall be permitted to be accessibly located inside wall heaters and wall furnaces listed for recessed installation where necessary maintenance is performed without removal of the shutoff valve.
Quick-disconnect devices used to connect appliances to the building piping shall be listed to CSA Z21.41. Where installed indoors, an approved manual shutoff valve with a nondisplaceable valve member shall be installed upstream of the quick-disconnect device. [NFPA 54:9.6.6 - 9.6.6.2]
Appliances shall be permitted to be connected to the building piping by means of a listed gas convenience outlet, in conjunction with a listed appliance connector, installed in accordance with the manufacturer's installation instructions.

     Gas convenience outlets shall be listed in accordance with CSA Z21.90 and installed in accordance with the manufacturer's installation instructions. [NFPA 54:9.6.7]
Where a sediment trap is not incorporated as a 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, but before the flex connector, where used at the time of appliance installation. The sediment trap shall be either a tee fitting with a capped nipple in the bottom outlet, as illustrated in Figure 1312.9 or other device recognized as an effective sediment trap. Illuminating appliances, ranges, clothes dryers, decorative appliances for installation in vented fireplaces, gas fireplaces, and outdoor grills shall not be required to be so equipped.


For SI units: 1 inch = 25.4 mm
FIGURE 1312.9
METHOD OF INSTALLING A TEE FITTING SEDIMENT TRAP
[NFPA 54: FIGURE 9.6.8]
Piping shall be installed in a manner not to interfere with inspection, maintenance, or servicing of the appliances. [NFPA 54:9.6.9]
Liquefied petroleum gas facilities shall comply with NFPA 58.
Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested to determine that the materials, design, fabrication, and installation practices comply with the requirements of this code. [NFPA 54:8.1.1.1]
Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly, or pressure tests. [NFPA 54:8.1.1.2]
Where repairs or additions are made following 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 leak-detecting methods approved by the Authority Having Jurisdiction. [NFPA 54:8.1.1.3]
Where new branches are installed to new appliance(s), only the newly installed branch(es) 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 approved leak-detecting methods. [NFPA 54:8.1.1.4]
A piping system shall 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 a double block and bleed valve system is installed. 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 pressure. [NFPA 54:8.1.1.5]
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. [NFPA 54:8.1.1.6]
The test medium shall be air, nitrogen, carbon dioxide, or an inert gas. OXYGEN SHALL NEVER BE USED. [NFPA 54:8.1.2]
Test preparation shall comply with Section 1313.2.1 through Section 1313.2.6.
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. [NFPA 54:8.1.3.1]
Expansion joints shall be provided with temporary restraints, if required, for the additional thrust load under test. [NFPA 54:8.1.3.2]
Appliances and equipment that are not to be included in the test shall be either disconnected from the piping or isolated by blanks, blind flanges, or caps. Flanged joints at which blinds are inserted to blank off other equipment during the test shall not be required to be tested. [NFPA 54:8.1.3.3]
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 outlets. [NFPA 54:8.1.3.4]
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). [NFPA 54:8.1.3.5]
All testing of piping systems shall be performed in a manner that protects the safety of employees and the public during the test. [NFPA 54:8.1.3.6]
This inspection shall include an air, CO2, or nitrogen pressure test, at which time the gas piping shall stand a pressure of not less than 10 psi (69 kPa) gauge pressure. Test pressures shall be held for a length of time satisfactory to the Authority Having Jurisdiction but in no case less than 15 minutes with no perceptible drop in pressure. For welded piping, and for piping carrying gas at pressures in excess of 14 inches water column (3.5 kPa) pressure, the test pressure shall be not less than 60 psi (414 kPa) and shall be continued for a length of time satisfactory to the Authority Having Jurisdiction, but in no case for less than 30 minutes. For CSST carrying gas at pressures in excess of 14 inches water column (3.5 kPa) pressure, the test pressure shall be 30 psi (207 kPa) for 30 minutes. These tests shall be made using air, CO2, or nitrogen pressure and shall be made in the presence of the Authority Having Jurisdiction. Necessary apparatus for conducting tests shall be furnished by the permit holder. Test gauges used in conducting test shall be in accordance with Section 1303.3.3.1 through Section 1303.3.3.4.
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. [NFPA 54:8.1.5.1]
The leakage shall be located by means of an approved gas detector, a noncorrosive leak detection fluid, or other approved leak detection methods. [NFPA 54:8.1.5.2]
Where leakage or other defects are located, the affected portion of the piping system shall be repaired or replaced and retested. [NFPA 54:8.1.5.3]
Leak checks using fuel gas shall be permitted in piping systems that have been pressure-tested in accordance with Section 1313.0. [NFPA 54:8.2.1]
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. [NFPA 54:8.2.2]
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. [NFPA 54:8.2.3]
Appliances and equipment shall not be placed in operation until after the piping system has been checked for leakage in accordance with Section 1313.5.2; the piping system is purged in accordance with Section 1313.6, and connections to the appliance are checked for leakage. [NFPA 54:8.2.4]
The purging of piping shall be in accordance with Section 1313.6.1 through Section 1313.6.3. [NFPA 54:8.3]
The purging of piping systems shall be in accordance with Section 1313.6.1.1 through Section 1313.6.1.4 where the piping system meets either of the following:
  1. The design operating gas pressure is greater than 2 psig (14 kPag).
  2. The piping being purged contains one or more sections of pipe or tubing meeting the size and length criteria of Table 1313.6.1. [NFPA 54:8.3.1]
TABLE 1313.6.1
SIZE AND LENGTH OF PIPING
[NFPA 54: TABLE 8.3.1]*
NOMINAL PIPING SIZE
(inches)
LENGTH OF PIPING
(feet)
≥ 21/2 < 3 > 50
≥ 3 < 4 > 30
≥ 4 < 6 > 15
≥ 6 < 8 > 10
≥8 Any length
For SI units: 1 inch = 25 mm; 1 = foot 304.8 mm
* CSST EHD size of 62 is equivalent to nominal 2 inches (50 mm) pipe or tubing size.
Where existing gas piping is opened, the section that is opened shall be isolated from the gas supply and the line pressure vented in accordance with Section 1313.6.1.3. Where gas piping meeting the criteria of Table 1313.6.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas. [NFPA 54:8.3.1.1]
Where gas piping containing air and meeting the criteria of Table 1313.6.1 is placed in operation, the air in the piping shall first be displaced with an inert gas. The inert gas shall then be displaced with fuel gas in accordance with Section 1313.6.1.3. [NFPA 54:8.3.1.2]
The open end of a piping system being pressure vented or purged shall discharge directly to an outdoor location. Purging operations shall comply with all of the following requirements:
  1. The point of discharge shall be controlled with a shutoff valve.
  2. The point of discharge shall be located at least 10 feet (3048 mm) from sources of ignition, at least 10 feet (3048 mm) from building openings, and at least 25 feet (7620 mm) from mechanical air intake openings.
  3. During discharge, the open point of discharge shall be continuously attended and monitored with a combustible gas indicator that complies with Section 1313.6.1.4.
  4. Purging operations introducing fuel gas shall be stopped when 90 percent fuel gas by volume is detected within the pipe.
  5. Persons not involved in the purging operations shall be evacuated from all areas within 10 feet (3048 mm) of the point of discharge. [NFPA 54:8.3.1.3]
Combustible gas indicators shall be listed and calibrated in accordance with the manufacturer's instructions. Combustible gas indicators shall numerically display a volume scale from 0 percent to 100 percent in 1 percent or smaller increments. [NFPA 54:8.3.1.4]
The purging of piping systems shall be in accordance with the provisions of Section 1313.6.2.1 where the piping system meets both of the following:
  1. The design operating pressure is 2 psig (14 kPag) or less.
  2. The piping being purged is constructed entirely from pipe or tubing not meeting the size and length criteria of Table 1313.6.1.[NFPA 54:8.3.2]
The piping system shall be purged in accordance with one or more of the following:
  1. The piping shall be purged with fuel gas and shall discharge to the outdoors.
  2. The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through an appliance burner not located in a combustion chamber. Such burner shall be provided with a continuous source of ignition.
  3. The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through a burner that has a continuous source of ignition and that is designed for such purpose.
  4. The piping shall be purged with fuel gas that is discharged to the indoors or outdoors, and the point of discharge shall be monitored with a listed combustible gas detector in accordance with Section 1313.6.2.2. Purging shall be stopped when fuel gas is detected.
  5. The piping shall be purged by the gas supplier in accordance with written procedures. [NFPA 54:8.3.2.1]
Combustible gas detectors shall be listed and calibrated or tested in accordance with the manufacturer's instructions. Combustible gas detectors shall be capable of indicating the presence of fuel gas. [NFPA 54:8.3.2.2]
After the piping system has been placed in operation, appliances and equipment shall be purged before being placed into operation. [NFPA 54:8.3.3]
The following regulations, shall comply with this section and Section 1315.0, shall be the standard for the installation of gas piping. Natural gas regulations and tables are based on the use of gas having a specific gravity of 0.60 and for undiluted liquefied petroleum gas having a specific gravity of 1.50.

     Where gas of a different specific gravity is to be delivered, the serving gas supplier shall be permitted to be contacted for specific gravity conversion factors to use in sizing piping systems from the pipe sizing tables in this chapter.
The hourly volume of gas required at each piping outlet shall be taken as not less than the maximum hourly rating as specified by the manufacturer of the appliance or appliances to be connected to each such outlet.
Where the gas appliances to be installed have not been definitely specified, Table 1308.4.1 shall be permitted to be used as a reference to estimate requirements of typical appliances. To obtain the cubic feet per hour (m3/h) of gas required, divide the input of the appliances by the average Btu (kW•h) heating value per cubic foot (m3) of the gas. The average Btu (kW•h) per cubic foot (m3) of the gas in the area of the installation shall be permitted to be obtained from the serving gas supplier.
The size of the supply piping outlet for a gas appliance shall be not less than 1/2 of an inch (15 mm).

     The size of a piping outlet for a mobile home shall be not less than 3/4 of an inch (20 mm).
Where the pipe size is to be determined using a method in Section 1315.1.1 through Section 1315.1.3, the diameter of each pipe segment shall be obtained from the pipe sizing tables in Section 1315.2 or from the sizing equations in Section 1315.3. [NFPA 54:6.1]
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. [NFPA 54:6.1.1]

FIGURE 1315.1.1
EXAMPLE ILLUSTRATING USE OF TABLE 1308.4.1 AND TABLE 1315.2(1)

Problem: Determine the required pipe size of each section and outlet of the piping system shown in Figure 1315.1.1. Gas to be used has a specific gravity of 0.60 and 1100 British thermal units (Btu) per cubic foot (0.0114 kW•h/L), delivered at 8 inch water column (1.9 kPa) pressure.


For SI units: 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1000 British thermal units per hour = 0.293 kW, 1 cubic foot per hour = 0.0283 m3/h

Solution:
  1. Maximum gas demand of Outlet A -
    32 cubic feet per hour (0.91 m3/h) (from Table 1308.4.1).
    Maximum gas demand of Outlet B -
    3 cubic feet per hour (0.08 m3/h) (from Table 1308.4.1). Maximum gas demand of Outlet C -
    59 cubic feet per hour (1.67 m3/h) (from Table 1308.4.1).
    Maximum gas demand of Outlet D -
    136 cubic feet per hour (3.85 m3/h) [150000 Btu/hour (44 kW)] divided by 1100 Btu per cubic foot (0.0114 kW•h/L)
  2. The length of pipe from the gas meter to the most remote outlet (Outlet A) is 60 feet (18288 mm).
  3. Using the length in feet column row marked 60 feet (18288 mm) in Table 1315.2(1):

    Outlet A, supplying 32 cubic feet per hour (0.91 m3/h), requires 1/2 of an inch (15 mm) pipe.

    Section 1, supplying Outlets A and B, or 35 cubic feet per hour (0.99 m3/h) requires 1/2 of an inch (15 mm) pipe.

    Section 2, supplying Outlets A, B, and C, or 94 cubic feet per hour (2.66 m3/h) requires 3/4 of an inch (20 mm) pipe.

    Section 3, supplying Outlets A, B, C, and D, or 230 cubic feet per hour (6.51 m3/h), requires 1 inch (25 mm) pipe.
  4. Using the column marked 60 feet (18288 mm) in Table 1315.2(1) [no column for actual length of 55 feet (16764 mm)]:

    Outlet B supplying 3 cubic feet per hour (0.08 m3/h), requires 1/2 of an inch (15 mm) pipe.

    Outlet C, supplying 59 cubic feet per hour (1.67 m3/h), requires 1/2 of an inch (15 mm) pipe.

    Using the column marked 60 feet (18288 mm) in Table 1315.2(1):

    Outlet D, supplying 136 cubic feet per hour (3.85 m3/h), requires 3/4 of an inch (20 mm) pipe.
Pipe shall be sized as follows:
  1. The 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. [NFPA 54:6.1.2]
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. [NFPA 54:6.1.3]
Table 1315.2(1) through Table 1315.2(36) shall be used to size gas piping in conjunction with one of the methods described in Section 1315.1.1 through Section 1315.1.3. [NFPA 54:6.2]

TABLE 1315.2(1)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.2(b)]1,2
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
(feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 172 360 678 1390 2090 4020 6400 11300 23100 41800 67600 139000 252000 399000
20 118 247 466 957 1430 2760 4400 7780 15900 28700 46500 95500 173000 275000
30 95 199 374 768 1150 2220 3530 6250 12700 23000 37300 76700 139000 220000
40 81 170 320 657 985 1900 3020 5350 10900 19700 31900 65600 119000 189000
50 72 151 284 583 873 1680 2680 4740 9660 17500 28300 58200 106000 167000
60 65 137 257 528 791 1520 2430 4290 8760 15800 25600 52700 95700 152000
70 60 126 237 486 728 1400 2230 3950 8050 14600 23600 48500 88100 139000
80 56 117 220 452 677 1300 2080 3670 7490 13600 22000 45100 81900 130000
90 52 110 207 424 635 1220 1950 3450 7030 12700 20600 42300 76900 122000
100 50 104 195 400 600 1160 1840 3260 6640 12000 19500 40000 72600 115000
125 44 92 173 355 532 1020 1630 2890 5890 10600 17200 35400 64300 102000
150 40 83 157 322 482 928 1480 2610 5330 9650 15600 32100 58300 92300
175 37 77 144 296 443 854 1360 2410 4910 8880 14400 29500 53600 84900
200 34 71 134 275 412 794 1270 2240 4560 8260 13400 27500 49900 79000
250 30 63 119 244 366 704 1120 1980 4050 7320 11900 24300 44200 70000
300 27 57 108 221 331 638 1020 1800 3670 6630 10700 22100 40100 63400
350 25 53 99 203 305 587 935 1650 3370 6100 9880 20300 36900 58400
400 23 49 92 189 283 546 870 1540 3140 5680 9190 18900 34300 54300
450 22 46 86 177 266 512 816 1440 2940 5330 8620 17700 32200 50900
500 21 43 82 168 251 484 771 1360 2780 5030 8150 16700 30400 48100
550 20 41 78 159 239 459 732 1290 2640 4780 7740 15900 28900 45700
600 19 39 74 152 228 438 699 1240 2520 4560 7380 15200 27500 43600
650 18 38 71 145 218 420 669 1180 2410 4360 7070 14500 26400 41800
700 17 36 68 140 209 403 643 1140 2320 4190 6790 14000 25300 40100
750 17 35 66 135 202 389 619 1090 2230 4040 6540 13400 24400 38600
800 16 34 63 130 195 375 598 1060 2160 3900 6320 13000 23600 37300
850 16 33 61 126 189 363 579 1020 2090 3780 6110 12600 22800 36100
900 15 32 59 122 183 352 561 992 2020 3660 5930 12200 22100 35000
950 15 31 58 118 178 342 545 963 1960 3550 5760 11800 21500 34000
1000 14 30 56 115 173 333 530 937 1910 3460 5600 11500 20900 33100
1100 14 28 53 109 164 316 503 890 1810 3280 5320 10900 19800 31400
1200 13 27 51 104 156 301 480 849 1730 3130 5070 10400 18900 30000
1300 12 26 49 100 150 289 460 813 1660 3000 4860 9980 18100 28700
1400 12 25 47 96 144 277 442 781 1590 2880 4670 9590 17400 27600
1500 11 24 45 93 139 267 426 752 1530 2780 4500 9240 16800 26600
1600 11 23 44 89 134 258 411 727 1480 2680 4340 8920 16200 25600
1700 11 22 42 86 130 250 398 703 1430 2590 4200 8630 15700 24800
1800 10 22 41 84 126 242 386 682 1390 2520 4070 8370 15200 24100
1900 10 21 40 81 122 235 375 662 1350 2440 3960 8130 14800 23400
2000 NA 20 39 79 119 229 364 644 1310 2380 3850 7910 14400 22700
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1 Table entries are rounded to 3 significant digits.
  2. 2 NA means a flow of less than 10 ft3/h (0.283 m3/h).
TABLE 1315.2(2)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.2(c)]*
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 3.0 in. w.c.
SPECIFIC GRAVITY: 0.60
INTENDED USE: INITIAL SUPPLY PRESSURE OF 8.0 IN. W.C. OR GREATER
PIPE SIZE (inch)
NOMINAL: 1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 454 949 1790 3670 5500 10600 16900 29800 60800
20 312 652 1230 2520 3780 7280 11600 20500 41800
30 250 524 986 2030 3030 5840 9310 16500 33600
40 214 448 844 1730 2600 5000 7970 14100 28700
50 190 397 748 1540 2300 4430 7060 12500 25500
60 172 360 678 1390 2090 4020 6400 11300 23100
70 158 331 624 1280 1920 3690 5890 10400 21200
80 147 308 580 1190 1790 3440 5480 9690 19800
90 138 289 544 1120 1670 3230 5140 9090 18500
100 131 273 514 1060 1580 3050 4860 8580 17500
125 116 242 456 936 1400 2700 4300 7610 15500
150 105 219 413 848 1270 2450 3900 6890 14100
175 96 202 380 780 1170 2250 3590 6340 12900
200 90 188 353 726 1090 2090 3340 5900 12000
250 80 166 313 643 964 1860 2960 5230 10700
300 72 151 284 583 873 1680 2680 4740 9660
350 66 139 261 536 803 1550 2470 4360 8890
400 62 129 243 499 747 1440 2290 4050 8270
450 58 121 228 468 701 1350 2150 3800 7760
500 55 114 215 442 662 1280 2030 3590 7330
550 52 109 204 420 629 1210 1930 3410 6960
600 50 104 195 400 600 1160 1840 3260 6640
650 47 99 187 384 575 1110 1760 3120 6360
700 46 95 179 368 552 1060 1690 3000 6110
750 44 92 173 355 532 1020 1630 2890 5890
800 42 89 167 343 514 989 1580 2790 5680
850 41 86 162 332 497 957 1530 2700 5500
900 40 83 157 322 482 928 1480 2610 5330
950 39 81 152 312 468 901 1440 2540 5180
1000 38 79 148 304 455 877 1400 2470 5040
1100 36 75 141 289 432 833 1330 2350 4780
1200 34 71 134 275 412 794 1270 2240 4560
1300 33 68 128 264 395 761 1210 2140 4370
1400 31 65 123 253 379 731 1160 2060 4200
1500 30 63 119 244 366 704 1120 1980 4050
1600 29 61 115 236 353 680 1080 1920 3910
1700 28 59 111 228 342 658 1050 1850 3780
1800 27 57 108 221 331 638 1020 1800 3670
1900 27 56 105 215 322 619 987 1750 3560
2000 26 54 102 209 313 602 960 1700 3460
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(3)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.2(d)]*
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 6.0 in. w.c.
SPECIFIC GRAVITY: 0.60
INTENDED USE: INITIAL SUPPLY PRESSURE OF 11.0 IN. W.C. OR GREATER
PIPE SIZE (inch)
NOMINAL: 1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL ID: 0.622 0.824 1.049 1.38 1.61 2.067 2.469 3.068 4.026
LENGTH
(feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 660 1380 2600 5340 8000 15400 24600 43400 88500
20 454 949 1790 3670 5500 10600 16900 29800 60800
30 364 762 1440 2950 4410 8500 13600 24000 48900
40 312 652 1230 2520 3780 7280 11600 20500 41800
50 276 578 1090 2240 3350 6450 10300 18200 37100
60 250 524 986 2030 3030 5840 9310 16500 33600
70 230 482 907 1860 2790 5380 8570 15100 30900
80 214 448 844 1730 2600 5000 7970 14100 28700
90 201 420 792 1630 2440 4690 7480 13200 27000
100 190 397 748 1540 2300 4430 7060 12500 25500
125 168 352 663 1360 2040 3930 6260 11100 22600
150 153 319 601 1230 1850 3560 5670 10000 20500
175 140 293 553 1140 1700 3270 5220 9230 18800
200 131 273 514 1056 1580 3050 4860 8580 17500
250 116 242 456 936 1400 2700 4300 7610 15500
300 105 219 413 848 1270 2450 3900 6890 14100
350 96 202 380 780 1170 2250 3590 6340 12900
400 90 188 353 726 1090 2090 3340 5900 12000
450 84 176 332 681 1020 1960 3130 5540 11300
500 80 166 313 643 964 1860 2960 5230 10700
550 76 158 297 611 915 1760 2810 4970 10100
600 72 151 284 583 873 1680 2680 4740 9660
650 69 144 272 558 836 1610 2570 4540 9250
700 66 139 261 536 803 1550 2470 4360 8890
750 64 134 252 516 774 1490 2380 4200 8560
800 62 129 243 499 747 1440 2290 4050 8270
850 60 125 235 483 723 1390 2220 3920 8000
900 58 121 228 468 701 1350 2150 3800 7760
950 56 118 221 454 681 1310 2090 3690 7540
1000 55 114 215 442 662 1280 2030 3590 7330
1100 52 109 204 420 629 1210 1930 3410 6960
1200 50 104 195 400 600 1160 1840 3260 6640
1300 47 99 187 384 575 1110 1760 3120 6360
1400 46 95 179 368 552 1060 1690 3000 6110
1500 44 92 173 355 532 1020 1630 2890 5890
1600 42 89 167 343 514 989 1580 2790 5680
1700 41 86 162 332 497 957 1530 2700 5500
1800 40 83 157 322 482 928 1480 2610 5330
1900 39 81 152 312 468 901 1440 2540 5180
2000 38 79 148 304 455 877 1400 2470 5040
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(4)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.2(e)]*
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
(feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 1510 3040 5560 11400 17100 32900 52500 92800 189000
20 1070 2150 3930 8070 12100 23300 37100 65600 134000
30 869 1760 3210 6590 9880 19000 30300 53600 109000
40 753 1520 2780 5710 8550 16500 26300 46400 94700
50 673 1360 2490 5110 7650 14700 23500 41500 84700
60 615 1240 2270 4660 6980 13500 21400 37900 77300
70 569 1150 2100 4320 6470 12500 19900 35100 71600
80 532 1080 1970 4040 6050 11700 18600 32800 67000
90 502 1010 1850 3810 5700 11000 17500 30900 63100
100 462 934 1710 3510 5260 10100 16100 28500 58200
125 414 836 1530 3140 4700 9060 14400 25500 52100
150 372 751 1370 2820 4220 8130 13000 22900 46700
175 344 695 1270 2601 3910 7530 12000 21200 43300
200 318 642 1170 2410 3610 6960 11100 19600 40000
250 279 583 1040 2140 3210 6180 9850 17400 35500
300 253 528 945 1940 2910 5600 8920 15800 32200
350 232 486 869 1790 2670 5150 8210 14500 29600
400 216 452 809 1660 2490 4790 7640 13500 27500
450 203 424 759 1560 2330 4500 7170 12700 25800
500 192 401 717 1470 2210 4250 6770 12000 24400
550 182 381 681 1400 2090 4030 6430 11400 23200
600 174 363 650 1330 2000 3850 6130 10800 22100
650 166 348 622 1280 1910 3680 5870 10400 21200
700 160 334 598 1230 1840 3540 5640 9970 20300
750 154 322 576 1180 1770 3410 5440 9610 19600
800 149 311 556 1140 1710 3290 5250 9280 18900
850 144 301 538 1100 1650 3190 5080 8980 18300
900 139 292 522 1070 1600 3090 4930 8710 17800
950 135 283 507 1040 1560 3000 4780 8460 17200
1000 132 275 493 1010 1520 2920 4650 8220 16800
1100 125 262 468 960 1440 2770 4420 7810 15900
1200 119 250 446 917 1370 2640 4220 7450 15200
1300 114 239 427 878 1320 2530 4040 7140 14600
1400 110 230 411 843 1260 2430 3880 6860 14000
1500 106 221 396 812 1220 2340 3740 6600 13500
1600 102 214 382 784 1180 2260 3610 6380 13000
1700 99 207 370 759 1140 2190 3490 6170 12600
1800 96 200 358 736 1100 2120 3390 5980 12200
1900 93 195 348 715 1070 2060 3290 5810 11900
2000 91 189 339 695 1040 2010 3200 5650 11500
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(5)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.2(f)]*
GAS: NATURAL
INLET PRESSURE: 3.0 psi
PRESSURE DROP: 2.0 psi
SPECIFIC GRAVITY: 0.60
PIPE SIZE (inch)
NOMINAL: 1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH
(feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 2350 4920 9270 19000 28500 54900 87500 155000 316000
20 1620 3380 6370 13100 19600 37700 60100 106000 217000
30 1300 2720 5110 10500 15700 30300 48300 85400 174000
40 1110 2320 4380 8990 13500 25900 41300 73100 149000
50 985 2060 3880 7970 11900 23000 36600 64800 132000
60 892 1870 3520 7220 10800 20800 33200 58700 120000
70 821 1720 3230 6640 9950 19200 30500 54000 110000
80 764 1600 3010 6180 9260 17800 28400 50200 102000
90 717 1500 2820 5800 8680 16700 26700 47100 96100
100 677 1420 2670 5470 8200 15800 25200 44500 90800
125 600 1250 2360 4850 7270 14000 22300 39500 80500
150 544 1140 2140 4400 6590 12700 20200 35700 72900
175 500 1050 1970 4040 6060 11700 18600 32900 67100
200 465 973 1830 3760 5640 10900 17300 30600 62400
250 412 862 1620 3330 5000 9620 15300 27100 55300
300 374 781 1470 3020 4530 8720 13900 24600 50100
350 344 719 1350 2780 4170 8020 12800 22600 46100
400 320 669 1260 2590 3870 7460 11900 21000 42900
450 300 627 1180 2430 3640 7000 11200 19700 40200
500 283 593 1120 2290 3430 6610 10500 18600 38000
550 269 563 1060 2180 3260 6280 10000 17700 36100
600 257 537 1010 2080 3110 5990 9550 16900 34400
650 246 514 969 1990 2980 5740 9150 16200 33000
700 236 494 931 1910 2860 5510 8790 15500 31700
750 228 476 897 1840 2760 5310 8470 15000 30500
800 220 460 866 1780 2660 5130 8180 14500 29500
850 213 445 838 1720 2580 4960 7910 14000 28500
900 206 431 812 1670 2500 4810 7670 13600 27700
950 200 419 789 1620 2430 4670 7450 13200 26900
1000 195 407 767 1580 2360 4550 7240 12800 26100
1100 185 387 729 1500 2240 4320 6890 12200 24800
1200 177 369 695 1430 2140 4120 6570 11600 23700
1300 169 353 666 1370 2050 3940 6290 11100 22700
1400 162 340 640 1310 1970 3790 6040 10700 21800
1500 156 327 616 1270 1900 3650 5820 10300 21000
1600 151 316 595 1220 1830 3530 5620 10000 20300
1700 146 306 576 1180 1770 3410 5440 9610 19600
1800 142 296 558 1150 1720 3310 5270 9320 19000
1900 138 288 542 1110 1670 3210 5120 9050 18400
2000 134 280 527 1080 1620 3120 4980 8800 18000
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(6)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.2(g)]*
GAS: NATURAL
INLET PRESSURE: 5.0 psi
PRESSURE DROP: 3.5 psi
SPECIFIC GRAVITY: 0.60
PIPE SIZE (inch)
NOMINAL: 1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH
(feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 3190 6430 11800 24200 36200 69700 111000 196000 401000
20 2250 4550 8320 17100 25600 49300 78600 139000 283000
30 1840 3720 6790 14000 20900 40300 64200 113000 231000
40 1590 3220 5880 12100 18100 34900 55600 98200 200000
50 1430 2880 5260 10800 16200 31200 49700 87900 179000
60 1300 2630 4800 9860 14800 28500 45400 80200 164000
70 1200 2430 4450 9130 13700 26400 42000 74300 151000
80 1150 2330 4260 8540 12800 24700 39300 69500 142000
90 1060 2150 3920 8050 12100 23200 37000 65500 134000
100 979 1980 3620 7430 11100 21400 34200 60400 123000
125 876 1770 3240 6640 9950 19200 30600 54000 110000
150 786 1590 2910 5960 8940 17200 27400 48500 98900
175 728 1470 2690 5520 8270 15900 25400 44900 91600
200 673 1360 2490 5100 7650 14700 23500 41500 84700
250 558 1170 2200 4510 6760 13000 20800 36700 74900
300 506 1060 1990 4090 6130 11800 18800 33300 67800
350 465 973 1830 3760 5640 10900 17300 30600 62400
400 433 905 1710 3500 5250 10100 16100 28500 58100
450 406 849 1600 3290 4920 9480 15100 26700 54500
500 384 802 1510 3100 4650 8950 14300 25200 51500
550 364 762 1440 2950 4420 8500 13600 24000 48900
600 348 727 1370 2810 4210 8110 12900 22900 46600
650 333 696 1310 2690 4030 7770 12400 21900 44600
700 320 669 1260 2590 3880 7460 11900 21000 42900
750 308 644 1210 2490 3730 7190 11500 20300 41300
800 298 622 1170 2410 3610 6940 11100 19600 39900
850 288 602 1130 2330 3490 6720 10700 18900 38600
900 279 584 1100 2260 3380 6520 10400 18400 37400
950 271 567 1070 2190 3290 6330 10100 17800 36400
1000 264 551 1040 2130 3200 6150 9810 17300 35400
1100 250 524 987 2030 3030 5840 9320 16500 33600
1200 239 500 941 1930 2900 5580 8890 15700 32000
1300 229 478 901 1850 2770 5340 8510 15000 30700
1400 220 460 866 1780 2660 5130 8180 14500 29500
1500 212 443 834 1710 2570 4940 7880 13900 28400
1600 205 428 806 1650 2480 4770 7610 13400 27400
1700 198 414 780 1600 2400 4620 7360 13000 26500
1800 192 401 756 1550 2330 4480 7140 12600 25700
1900 186 390 734 1510 2260 4350 6930 12300 25000
2000 181 379 714 1470 2200 4230 6740 11900 24300
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(7)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(h)]1, 2
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 0.3 in. w.c.
SPECIFIC GRAVITY: 0.60
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:3 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 20 42 85 148 210 448 806 1270 2650
20 14 29 58 102 144 308 554 873 1820
30 11 23 47 82 116 247 445 701 1460
40 10 20 40 70 99 211 381 600 1250
50 NA 17 35 62 88 187 337 532 1110
60 NA 16 32 56 79 170 306 482 1000
70 NA 14 29 52 73 156 281 443 924
80 NA 13 27 48 68 145 262 413 859
90 NA 13 26 45 64 136 245 387 806
100 NA 12 24 43 60 129 232 366 761
125 NA 11 22 38 53 114 206 324 675
150 NA 10 20 34 48 103 186 294 612
175 NA NA 18 31 45 95 171 270 563
200 NA NA 17 29 41 89 159 251 523
250 NA NA 15 26 37 78 141 223 464
300 NA NA 13 23 33 71 128 202 420
350 NA NA 12 22 31 65 118 186 387
400 NA NA 11 20 28 61 110 173 360
450 NA NA 11 19 27 57 103 162 338
500 NA NA 10 18 25 54 97 153 319
550 NA NA NA 17 24 51 92 145 303
600 NA NA NA 16 23 49 88 139 289
650 NA NA NA 15 22 47 84 133 277
700 NA NA NA 15 21 45 81 128 266
750 NA NA NA 14 20 43 78 123 256
800 NA NA NA 14 20 42 75 119 247
850 NA NA NA 13 19 40 73 115 239
900 NA NA NA 13 18 39 71 111 232
950 NA NA NA 13 18 38 69 108 225
1000 NA NA NA 12 17 37 67 105 219
1100 NA NA NA 12 16 35 63 100 208
1200 NA NA NA 11 16 34 60 95 199
1300 NA NA NA 11 15 32 58 91 190
1400 NA NA NA 10 14 31 56 88 183
1500 NA NA NA NA 14 30 54 84 176
1600 NA NA NA NA 13 29 52 82 170
1700 NA NA NA NA 13 28 50 79 164
1800 NA NA NA NA 13 27 49 77 159
1900 NA NA NA NA 12 26 47 74 155
2000 NA NA NA NA 12 25 46 72 151
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table entries are rounded to 3 significant digits.
  2. 2   NA means a flow of less than 10 ft3/h (0.283 m3/h).
  3. 3   Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
TABLE 1315.2(8)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(i)]1, 2
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:3 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 27 55 111 195 276 590 1060 1680 3490
20 18 38 77 134 190 406 730 1150 2400
30 15 30 61 107 152 326 586 925 1930
40 13 26 53 92 131 279 502 791 1650
50 11 23 47 82 116 247 445 701 1460
60 10 21 42 74 105 224 403 635 1320
70 NA 19 39 68 96 206 371 585 1220
80 NA 18 36 63 90 192 345 544 1130
90 NA 17 34 59 84 180 324 510 1060
100 NA 16 32 56 79 170 306 482 1000
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
1000 NA NA NA 16 23 49 88 139 289
1100 NA NA NA 15 22 46 84 132 274
1200 NA NA NA 15 21 44 80 126 262
1300 NA NA NA 14 20 42 76 120 251
1400 NA NA NA 13 19 41 73 116 241
1500 NA NA NA 13 18 39 71 111 232
1600 NA NA NA 13 18 38 68 108 224
1700 NA NA NA 12 17 37 66 104 217
1800 NA NA NA 12 17 36 64 101 210
1900 NA NA NA 11 16 35 62 98 204
2000 NA NA NA 11 16 34 60 95 199
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table entries are rounded to 3 significant digits.
  2. 2   NA means a flow of less than 10 ft3/h (0.283 m3/h).
  3. 3   Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
TABLE 1315.2(9)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(j)]1, 2
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 1.0 in. w.c.
SPECIFIC GRAVITY: 0.60
INTENDED USE: TUBE SIZING BETWEEN HOUSE LINE REGULATOR AND THE APPLIANCE
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:3 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 39 80 162 283 402 859 1550 2440 5080
20 27 55 111 195 276 590 1060 1680 3490
30 21 44 89 156 222 474 853 1350 2800
40 18 38 77 134 190 406 730 1150 2400
50 16 33 68 119 168 359 647 1020 2130
60 15 30 61 107 152 326 586 925 1930
70 13 28 57 99 140 300 539 851 1770
80 13 26 53 92 131 279 502 791 1650
90 12 24 49 86 122 262 471 742 1550
100 11 23 47 82 116 247 445 701 1460
125 NA 20 41 72 103 219 394 622 1290
150 NA 18 37 65 93 198 357 563 1170
175 NA 17 34 60 85 183 329 518 1080
200 NA 16 32 56 79 170 306 482 1000
250 NA 14 28 50 70 151 271 427 890
300 NA 13 26 45 64 136 245 387 806
350 NA 12 24 41 59 125 226 356 742
400 NA 11 22 39 55 117 210 331 690
450 NA 10 21 36 51 110 197 311 647
500 NA NA 20 34 48 103 186 294 612
550 NA NA 19 32 46 98 177 279 581
600 NA NA 18 31 44 94 169 266 554
650 NA NA 17 30 42 90 162 255 531
700 NA NA 16 28 40 86 155 245 510
750 NA NA 16 27 39 83 150 236 491
800 NA NA 15 26 38 80 144 228 474
850 NA NA 15 26 36 78 140 220 459
900 NA NA 14 25 35 75 135 214 445
950 NA NA 14 24 34 73 132 207 432
1000 NA NA 13 23 33 71 128 202 420
1100 NA NA 13 22 32 68 122 192 399
1200 NA NA 12 21 30 64 116 183 381
1300 NA NA 12 20 29 62 111 175 365
1400 NA NA 11 20 28 59 107 168 350
1500 NA NA 11 19 27 57 103 162 338
1600 NA NA 10 18 26 55 99 156 326
1700 NA NA 10 18 25 53 96 151 315
1800 NA NA NA 17 24 52 93 147 306
1900 NA NA NA 17 24 50 90 143 297
2000 NA NA NA 16 23 49 88 139 289
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table entries are rounded to 3 significant digits.
  2. 2   NA means a flow of less than 10 ft3/h (0.283 m3/h).
  3. 3   Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
TABLE 1315.2(10)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(k)]2
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 17.0 in. w.c.
SPECIFIC GRAVITY: 0.60
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 190 391 796 1390 1970 4220 7590 12000 24900
20 130 269 547 956 1360 2900 5220 8230 17100
30 105 216 439 768 1090 2330 4190 6610 13800
40 90 185 376 657 932 1990 3590 5650 11800
50 79 164 333 582 826 1770 3180 5010 10400
60 72 148 302 528 749 1600 2880 4540 9460
70 66 137 278 486 689 1470 2650 4180 8700
80 62 127 258 452 641 1370 2460 3890 8090
90 58 119 243 424 601 1280 2310 3650 7590
100 55 113 229 400 568 1210 2180 3440 7170
125 48 100 203 355 503 1080 1940 3050 6360
150 44 90 184 321 456 974 1750 2770 5760
175 40 83 169 296 420 896 1610 2540 5300
200 38 77 157 275 390 834 1500 2370 4930
250 33 69 140 244 346 739 1330 2100 4370
300 30 62 126 221 313 670 1210 1900 3960
350 28 57 116 203 288 616 1110 1750 3640
400 26 53 108 189 268 573 1030 1630 3390
450 24 50 102 177 252 538 968 1530 3180
500 23 47 96 168 238 508 914 1440 3000
550 22 45 91 159 226 482 868 1370 2850
600 21 43 87 152 215 460 829 1310 2720
650 20 41 83 145 206 441 793 1250 2610
700 19 39 80 140 198 423 762 1200 2500
750 18 38 77 135 191 480 734 1160 2410
800 18 37 74 130 184 394 709 1120 2330
850 17 35 72 126 178 381 686 1080 2250
900 17 34 70 122 173 370 665 1050 2180
950 16 33 68 118 168 359 646 1020 2120
1000 16 32 66 115 163 349 628 991 2060
1100 15 31 63 109 155 332 597 941 1960
1200 14 29 60 104 148 316 569 898 1870
1300 14 28 57 100 142 303 545 860 1790
1400 13 27 55 96 136 291 524 826 1720
1500 13 26 53 93 131 280 505 796 1660
1600 12 25 51 89 127 271 487 768 1600
1700 12 24 49 86 123 262 472 744 1550
1800 11 24 48 84 119 254 457 721 1500
1900 11 23 47 81 115 247 444 700 1460
2000 11 22 45 79 112 240 432 681 1420
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 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. 2   Table entries are rounded to 3 significant digits.
TABLE 1315.2(11)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(l)]2
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:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 245 506 1030 1800 2550 5450 9820 15500 32200
20 169 348 708 1240 1760 3750 6750 10600 22200
30 135 279 568 993 1410 3010 5420 8550 17800
40 116 239 486 850 1210 2580 4640 7310 15200
50 103 212 431 754 1070 2280 4110 6480 13500
60 93 192 391 683 969 2070 3730 5870 12200
70 86 177 359 628 891 1900 3430 5400 11300
80 80 164 334 584 829 1770 3190 5030 10500
90 75 154 314 548 778 1660 2990 4720 9820
100 71 146 296 518 735 1570 2830 4450 9280
125 63 129 263 459 651 1390 2500 3950 8220
150 57 117 238 416 590 1260 2270 3580 7450
175 52 108 219 383 543 1160 2090 3290 6850
200 49 100 204 356 505 1080 1940 3060 6380
250 43 89 181 315 448 956 1720 2710 5650
300 39 80 164 286 406 866 1560 2460 5120
350 36 74 150 263 373 797 1430 2260 4710
400 33 69 140 245 347 741 1330 2100 4380
450 31 65 131 230 326 696 1250 1970 4110
500 30 61 124 217 308 657 1180 1870 3880
550 28 58 118 206 292 624 1120 1770 3690
600 27 55 112 196 279 595 1070 1690 3520
650 26 53 108 188 267 570 1030 1620 3370
700 25 51 103 181 256 548 986 1550 3240
750 24 49 100 174 247 528 950 1500 3120
800 23 47 96 168 239 510 917 1450 3010
850 22 46 93 163 231 493 888 1400 2920
900 22 44 90 158 224 478 861 1360 2830
950 21 43 88 153 217 464 836 1320 2740
1000 20 42 85 149 211 452 813 1280 2670
1100 19 40 81 142 201 429 772 1220 2540
1200 18 38 77 135 192 409 737 1160 2420
1300 18 36 74 129 183 392 705 1110 2320
1400 17 35 71 124 176 376 678 1070 2230
1500 16 34 68 120 170 363 653 1030 2140
1600 16 33 66 116 164 350 630 994 2070
1700 15 31 64 112 159 339 610 962 2000
1800 15 30 62 108 154 329 592 933 1940
1900 14 30 60 105 149 319 575 906 1890
2000 14 29 59 102 145 310 559 881 1830
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 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. 2   Table entries are rounded to 3 significant digits.
TABLE 1315.2(12)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(m)]3
GAS: NATURAL
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.5 psi
SPECIFIC GRAVITY: 0.60
INTENDED USE: PIPE SIZING BETWEEN POINT OF DELIVERY AND THE HOUSE LINE REGULATOR. TOTAL LOAD SUPPLIED BY A
SINGLE HOUSE LINE REGULATOR NOT EXCEEDING 150 CUBIC FEET PER HOUR2.
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:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 303 625 1270 2220 3150 6740 12100 19100 39800
20 208 430 874 1530 2170 4630 8330 13100 27400
30 167 345 702 1230 1740 3720 6690 10600 22000
40 143 295 601 1050 1490 3180 5730 9030 18800
50 127 262 532 931 1320 2820 5080 8000 16700
60 115 237 482 843 1200 2560 4600 7250 15100
70 106 218 444 776 1100 2350 4230 6670 13900
80 98 203 413 722 1020 2190 3940 6210 12900
90 92 190 387 677 961 2050 3690 5820 12100
100 87 180 366 640 907 1940 3490 5500 11500
125 77 159 324 567 804 1720 3090 4880 10200
150 70 144 294 514 729 1560 2800 4420 9200
175 64 133 270 472 670 1430 2580 4060 8460
200 60 124 252 440 624 1330 2400 3780 7870
250 53 110 223 390 553 1180 2130 3350 6980
300 48 99 202 353 501 1070 1930 3040 6320
350 44 91 186 325 461 984 1770 2790 5820
400 41 85 173 302 429 916 1650 2600 5410
450 39 80 162 283 402 859 1550 2440 5080
500 36 75 153 268 380 811 1460 2300 4800
550 35 72 146 254 361 771 1390 2190 4560
600 33 68 139 243 344 735 1320 2090 4350
650 32 65 133 232 330 704 1270 2000 4160
700 30 63 128 223 317 676 1220 1920 4000
750 29 60 123 215 305 652 1170 1850 3850
800 28 58 119 208 295 629 1130 1790 3720
850 27 57 115 201 285 609 1100 1730 3600
900 27 55 111 195 276 590 1060 1680 3490
950 26 53 108 189 268 573 1030 1630 3390
1000 25 52 105 184 261 558 1000 1580 3300
1100 24 49 100 175 248 530 954 1500 3130
1200 23 47 95 167 237 505 910 1430 2990
1300 22 45 91 160 227 484 871 1370 2860
1400 21 43 88 153 218 465 837 1320 2750
1500 20 42 85 148 210 448 806 1270 2650
1600 19 40 82 143 202 432 779 1230 2560
1700 19 39 79 138 196 419 753 1190 2470
1800 18 38 77 134 190 406 731 1150 2400
1900 18 37 74 130 184 394 709 1120 2330
2000 17 36 72 126 179 383 690 1090 2270
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 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. 2   Where this table is used to size the tubing upstream of a line pressure regulator, the pipe or tubing downstream of the line pressure regulator shall be sized using a pressure drop no greater than 1 inch water column (0.249 kPa).
  3. 3   Table entries are rounded to 3 significant digits.
TABLE 1315.2(13)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.2(n)]2
GAS: NATURAL
INLET PRESSURE: 5.0 psi
PRESSURE DROP: 3.5 psi
SPECIFIC GRAVITY: 0.60
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet)
CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 511 1050 2140 3750 5320 11400 20400 32200 67100
20 351 724 1470 2580 3650 7800 14000 22200 46100
30 282 582 1180 2070 2930 6270 11300 17800 37000
40 241 498 1010 1770 2510 5360 9660 15200 31700
50 214 441 898 1570 2230 4750 8560 13500 28100
60 194 400 813 1420 2020 4310 7750 12200 25500
70 178 368 748 1310 1860 3960 7130 11200 23400
80 166 342 696 1220 1730 3690 6640 10500 21800
90 156 321 653 1140 1620 3460 6230 9820 20400
100 147 303 617 1080 1530 3270 5880 9270 19300
125 130 269 547 955 1360 2900 5210 8220 17100
150 118 243 495 866 1230 2620 4720 7450 15500
175 109 224 456 796 1130 2410 4350 6850 14300
200 101 208 424 741 1050 2250 4040 6370 13300
250 90 185 376 657 932 1990 3580 5650 11800
300 81 167 340 595 844 1800 3250 5120 10700
350 75 154 313 547 777 1660 2990 4710 9810
400 69 143 291 509 722 1540 2780 4380 9120
450 65 134 273 478 678 1450 2610 4110 8560
500 62 127 258 451 640 1370 2460 3880 8090
550 58 121 245 429 608 1300 2340 3690 7680
600 56 115 234 409 580 1240 2230 3520 7330
650 53 110 224 392 556 1190 2140 3370 7020
700 51 106 215 376 534 1140 2050 3240 6740
750 49 102 207 362 514 1100 1980 3120 6490
800 48 98 200 350 497 1060 1910 3010 6270
850 46 95 194 339 481 1030 1850 2910 6070
900 45 92 188 328 466 1000 1790 2820 5880
950 43 90 182 319 452 967 1740 2740 5710
1000 42 87 177 310 440 940 1690 2670 5560
1100 40 83 169 295 418 893 1610 2530 5280
1200 38 79 161 281 399 852 1530 2420 5040
1300 37 76 154 269 382 816 1470 2320 4820
1400 35 73 148 259 367 784 1410 2220 4630
1500 34 70 143 249 353 755 1360 2140 4460
1600 33 68 138 241 341 729 1310 2070 4310
1700 32 65 133 233 330 705 1270 2000 4170
1800 31 63 129 226 320 684 1230 1940 4040
1900 30 62 125 219 311 664 1200 1890 3930
2000 29 60 122 213 302 646 1160 1830 3820
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 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. 2   Table entries are rounded to 3 significant digits.
TABLE 1315.2(14)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.2(o)]1, 2
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 0.60
TUBE SIZE (EHD)3
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 39 46 48 60 62
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
5 46 63 115 134 225 270 471 546 895 1037 1790 2070 3660 4140
10 32 44 82 95 161 192 330 383 639 746 1260 1470 2600 2930
15 25 35 66 77 132 157 267 310 524 615 1030 1200 2140 2400
20 22 31 58 67 116 137 231 269 456 536 888 1050 1850 2080
25 19 27 52 60 104 122 206 240 409 482 793 936 1660 1860
30 18 25 47 55 96 112 188 218 374 442 723 856 1520 1700
40 15 21 41 47 83 97 162 188 325 386 625 742 1320 1470
50 13 19 37 42 75 87 144 168 292 347 559 665 1180 1320
60 12 17 34 38 68 80 131 153 267 318 509 608 1080 1200
70 11 16 31 36 63 74 121 141 248 295 471 563 1000 1110
80 10 15 29 33 60 69 113 132 232 277 440 527 940 1040
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 units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table entries are rounded to 3 significant digits.
  2. 2   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  3. 3   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.
TABLE 1315.2(15)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.2(p)]1, 2
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 3.0 in. w.c.
SPECIFIC GRAVITY: 0.60
INTENDED USE: INITIAL SUPPLY PRESSURE OF 8.0 INCH WATER COLUMN OR GREATER
TUBE SIZE (EHD)3
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 46 48 60 62
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
5 120 160 277 327 529 649 1180 1370 2140 4430 5010 8800 10100
10 83 112 197 231 380 462 828 958 1530 3200 3560 6270 7160
15 67 90 161 189 313 379 673 778 1250 2540 2910 5140 5850
20 57 78 140 164 273 329 580 672 1090 2200 2530 4460 5070
25 51 69 125 147 245 295 518 599 978 1960 2270 4000 4540
30 46 63 115 134 225 270 471 546 895 1790 2070 3660 4140
40 39 54 100 116 196 234 407 471 778 1550 1800 3180 3590
50 35 48 89 104 176 210 363 421 698 1380 1610 2850 3210
60 32 44 82 95 161 192 330 383 639 1260 1470 2600 2930
70 29 41 76 88 150 178 306 355 593 1170 1360 2420 2720
80 27 38 71 82 141 167 285 331 555 1090 1280 2260 2540
90 26 36 67 77 133 157 268 311 524 1030 1200 2140 2400
100 24 34 63 73 126 149 254 295 498 974 1140 2030 2280
150 19 27 52 60 104 122 206 240 409 793 936 1660 1860
200 17 23 45 52 91 106 178 207 355 686 812 1440 1610
250 15 21 40 46 82 95 159 184 319 613 728 1290 1440
300 13 19 37 42 75 87 144 168 234 559 665 1180 1320
For SI units: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table entries are rounded to 3 significant digits.
  2. 2   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  3. 3   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.
TABLE 1315.2(16)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.2(q)]1, 2
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 6.0 in. w.c.
SPECIFIC GRAVITY: 0.60
INTENDED USE: INITIAL SUPPLY PRESSURE OF 11.0 INCH WATER COLUMN OR GREATER
TUBE SIZE (EHD)3
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 46 48 60 62
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
5 173 229 389 461 737 911 1690 1950 3000 6280 7050 12400 14260
10 120 160 277 327 529 649 1180 1370 2140 4430 5010 8800 10100
15 96 130 227 267 436 532 960 1110 1760 3610 4100 7210 8260
20 83 112 197 231 380 462 828 958 1530 3120 3560 6270 7160
25 74 99 176 207 342 414 739 855 1370 2790 3190 5620 6400
30 67 90 161 189 313 379 673 778 1250 2540 2910 5140 5850
40 57 78 140 164 273 329 580 672 1090 2200 2530 4460 5070
50 51 69 125 147 245 295 518 599 978 1960 2270 4000 4540
60 46 63 115 134 225 270 471 546 895 1790 2070 3660 4140
70 42 58 106 124 209 250 435 505 830 1660 1920 3390 3840
80 39 54 100 116 196 234 407 471 778 1550 1800 3180 3590
90 37 51 94 109 185 221 383 444 735 1460 1700 3000 3390
100 35 48 89 104 176 210 363 421 698 1380 1610 2850 3210
150 28 39 73 85 145 172 294 342 573 1130 1320 2340 2630
200 24 34 63 73 126 149 254 295 498 974 1140 2030 2280
250 21 30 57 66 114 134 226 263 447 870 1020 1820 2040
300 19 27 52 60 104 122 206 240 409 793 936 1660 1860
For SI units: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table entries are rounded to 3 significant digits.
  2. 2   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  3. 3   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.
TABLE 1315.2(17)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.2(r)]1, 2, 3, 4
GAS: NATURAL
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 0.60
TUBE SIZE (EHD)5
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 39 46 48 60 62
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 270 353 587 700 1100 1370 2590 2990 4510 5037 9600 10700 18600 21600
25 166 220 374 444 709 876 1620 1870 2890 3258 6040 6780 11900 13700
30 151 200 342 405 650 801 1480 1700 2640 2987 5510 6200 10900 12500
40 129 172 297 351 567 696 1270 1470 2300 2605 4760 5380 9440 10900
50 115 154 266 314 510 624 1140 1310 2060 2343 4260 4820 8470 9720
75 93 124 218 257 420 512 922 1070 1690 1932 3470 3950 6940 7940
80 89 120 211 249 407 496 892 1030 1640 1874 3360 3820 6730 7690
100 79 107 189 222 366 445 795 920 1470 1685 3000 3420 6030 6880
150 64 87 155 182 302 364 646 748 1210 1389 2440 2800 4940 5620
200 55 75 135 157 263 317 557 645 1050 1212 2110 2430 4290 4870
250 49 67 121 141 236 284 497 576 941 1090 1890 2180 3850 4360
300 44 61 110 129 217 260 453 525 862 999 1720 1990 3520 3980
400 38 52 96 111 189 225 390 453 749 871 1490 1730 3060 3450
500 34 46 86 100 170 202 348 404 552 783 1330 1550 2740 3090
For SI units: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 1   Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 0.75 psi (5.17 kPa), DO NOT USE THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator are capable of varying with flow rate.
  2. 2   CAUTION: Capacities shown in table are capable of exceeding maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.
  3. 3   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing according to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  4. 4   Table entries are rounded to 3 significant digits.
  5. 5   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.
TABLE 1315.2(18)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.2(s)]1, 2, 3, 4
GAS: NATURAL
INLET PRESSURE: 5.0 psi
PRESSURE DROP: 3.5 psi
SPECIFIC GRAVITY: 0.60
TUBE SIZE (EHD)5
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 39 46 48 60 62
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 523 674 1080 1300 2000 2530 4920 5660 8300 9140 18100 19800 34400 40400
25 322 420 691 827 1290 1620 3080 3540 5310 5911 11400 12600 22000 25600
30 292 382 632 755 1180 1480 2800 3230 4860 5420 10400 11500 20100 23400
40 251 329 549 654 1030 1280 2420 2790 4230 4727 8970 10000 17400 20200
50 223 293 492 586 926 1150 2160 2490 3790 4251 8020 8930 15600 18100
75 180 238 403 479 763 944 1750 2020 3110 3506 6530 7320 12800 14800
80 174 230 391 463 740 915 1690 1960 3020 3400 6320 7090 12400 14300
100 154 205 350 415 665 820 1510 1740 2710 3057 5650 6350 11100 12800
150 124 166 287 339 548 672 1230 1420 2220 2521 4600 5200 9130 10500
200 107 143 249 294 478 584 1060 1220 1930 2199 3980 4510 7930 9090
250 95 128 223 263 430 524 945 1090 1730 1977 3550 4040 7110 8140
300 86 116 204 240 394 479 860 995 1590 1813 3240 3690 6500 7430
400 74 100 177 208 343 416 742 858 1380 1581 2800 3210 5650 6440
500 66 89 159 186 309 373 662 766 1040 1422 2500 2870 5060 5760
For SI units: 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 1   Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 1 psi (7 kPa), DO NOT USE THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across regulator are capable of varying with the flow rate.
  2. 2   CAUTION: Capacities shown in table are capable of exceeding the maximum capacity of selected regulator. Consult tubing manufacturer for guidance.
  3. 3   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (feet) of tubing and n is the number of additional fittings, bends, or both.
  4. 4   Table entries are rounded to 3 significant digits.
  5. 5   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.
TABLE 1315.2(19)
POLYETHYLENE PLASTIC PIPE [NFPA 54: TABLE 6.2(t)]*
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 0.3 in. w.c.
SPECIFIC GRAVITY: 0.60
PIPE SIZE (inch)
NOMINAL OD: 1/2 3/4 1 1 1/4 11/2 2 3 4
DESIGNATION: SDR 9.3 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
ACTUAL ID: 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 153 305 551 955 1440 2590 7170 13900
20 105 210 379 656 991 1780 4920 9520
30 84 169 304 527 796 1430 3950 7640
40 72 144 260 451 681 1220 3380 6540
50 64 128 231 400 604 1080 3000 5800
60 58 116 209 362 547 983 2720 5250
70 53 107 192 333 503 904 2500 4830
80 50 99 179 310 468 841 2330 4500
90 46 93 168 291 439 789 2180 4220
100 44 88 159 275 415 745 2060 3990
125 39 78 141 243 368 661 1830 3530
150 35 71 127 221 333 598 1660 3200
175 32 65 117 203 306 551 1520 2940
200 30 60 109 189 285 512 1420 2740
250 27 54 97 167 253 454 1260 2430
300 24 48 88 152 229 411 1140 2200
350 22 45 81 139 211 378 1050 2020
400 21 42 75 130 196 352 974 1880
450 19 39 70 122 184 330 914 1770
500 18 37 66 115 174 312 863 1670
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(20)
POLYETHYLENE PLASTIC PIPE [NFPA 54: TABLE 6.2(u)]*
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 psi
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 0.60
PIPE SIZE (inch)
NOMINAL OD: 1/2 3/4 1 11/4 11/2 2 3 4
DESIGNATION: SDR 9.3 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
ACTUAL ID: 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 201 403 726 1260 1900 3410 9450 18260
20 138 277 499 865 1310 2350 6490 12550
30 111 222 401 695 1050 1880 5210 10080
40 95 190 343 594 898 1610 4460 8630
50 84 169 304 527 796 1430 3950 7640
60 76 153 276 477 721 1300 3580 6930
70 70 140 254 439 663 1190 3300 6370
80 65 131 236 409 617 1110 3070 5930
90 61 123 221 383 579 1040 2880 5560
100 58 116 209 362 547 983 2720 5250
125 51 103 185 321 485 871 2410 4660
150 46 93 168 291 439 789 2180 4220
175 43 86 154 268 404 726 2010 3880
200 40 80 144 249 376 675 1870 3610
250 35 71 127 221 333 598 1660 3200
300 32 64 115 200 302 542 1500 2900
350 29 59 106 184 278 499 1380 2670
400 27 55 99 171 258 464 1280 2480
450 26 51 93 160 242 435 1200 2330
500 24 48 88 152 229 411 1140 2200
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(21)
POLYETHYLENE PLASTIC PIPE [NFPA 54: TABLE 6.2(v)]*
GAS: NATURAL
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 0.60
PIPE SIZE (inch)
NOMINAL OD: 1/2 3/4 1 11/4 11/2 2 3 4
DESIGNATION: SDR 9.3 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
ACTUAL ID: 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 1860 3720 6710 11600 17600 31600 87300 169000
20 1280 2560 4610 7990 12100 21700 60000 116000
30 1030 2050 3710 6420 9690 17400 48200 93200
40 878 1760 3170 5490 8300 14900 41200 79700
50 778 1560 2810 4870 7350 13200 36600 70700
60 705 1410 2550 4410 6660 12000 33100 64000
70 649 1300 2340 4060 6130 11000 30500 58900
80 603 1210 2180 3780 5700 10200 28300 54800
90 566 1130 2050 3540 5350 9610 26600 51400
100 535 1070 1930 3350 5050 9080 25100 48600
125 474 949 1710 2970 4480 8050 22300 43000
150 429 860 1550 2690 4060 7290 20200 39000
175 395 791 1430 2470 3730 6710 18600 35900
200 368 736 1330 2300 3470 6240 17300 33400
250 326 652 1180 2040 3080 5530 15300 29600
300 295 591 1070 1850 2790 5010 13900 26800
350 272 544 981 1700 2570 4610 12800 24700
400 253 506 913 1580 2390 4290 11900 22900
450 237 475 856 1480 2240 4020 11100 21500
500 224 448 809 1400 2120 3800 10500 20300
550 213 426 768 1330 2010 3610 9990 19300
600 203 406 733 1270 1920 3440 9530 18400
650 194 389 702 1220 1840 3300 9130 17600
700 187 374 674 1170 1760 3170 8770 16900
750 180 360 649 1130 1700 3050 8450 16300
800 174 348 627 1090 1640 2950 8160 15800
850 168 336 607 1050 1590 2850 7890 15300
900 163 326 588 1020 1540 2770 7650 14800
950 158 317 572 990 1500 2690 7430 14400
1000 154 308 556 963 1450 2610 7230 14000
1100 146 293 528 915 1380 2480 6870 13300
1200 139 279 504 873 1320 2370 6550 12700
1300 134 267 482 836 1260 2270 6270 12100
1400 128 257 463 803 1210 2180 6030 11600
1500 124 247 446 773 1170 2100 5810 11200
1600 119 239 431 747 1130 2030 5610 10800
1700 115 231 417 723 1090 1960 5430 10500
1800 112 224 404 701 1060 1900 5260 10200
1900 109 218 393 680 1030 1850 5110 9900
2000 106 212 382 662 1000 1800 4970 9600
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(22)
POLYETHYLENE PLASTIC TUBING [NFPA 54: TABLE 6.2(w)]2, 3
GAS: NATURAL
INLET PRESSURE: LESS THAN 2.0 psi
PRESSURE DROP: 0.3 in. w.c.
SPECIFIC GRAVITY: 0.60
PLASTIC TUBING SIZE (CTS)1 (inch)
NOMINAL OD: 1/2 1
DESIGNATION: SDR 7 SDR 11
ACTUAL ID: 0.445 0.927
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 54 372
20 37 256
30 30 205
40 26 176
50 23 156
60 21 141
70 19 130
80 18 121
90 17 113
100 16 107
125 14 95
150 13 86
175 12 79
200 11 74
225 10 69
250 NA 65
275 NA 62
300 NA 59
350 NA 54
400 NA 51
450 NA 47
500 NA 45
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h,
1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   CTS = Copper tube size.
  2. 2   Table entries are rounded to 3 significant digits.
  3. 3   NA means a flow of less than 10 ft3/h (0.283 m3/h).
TABLE 1315.2(23)
POLYETHYLENE PLASTIC TUBING [NFPA 54: TABLE 6.2(x)]2, 3
GAS: NATURAL
INLET PRESSURE: LESS THAN 2.0 psi
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 0.60
PLASTIC TUBING SIZE (CTS)1 (inch)
NOMINAL OD: 1/2 1
DESIGNATION: SDR 7 SDR 11
ACTUAL ID: 0.445 0.927
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 72 490
20 49 337
30 39 271
40 34 232
50 30 205
60 27 186
70 25 171
80 23 159
90 22 149
100 21 141
125 18 125
150 17 113
175 15 104
200 14 97
225 13 91
250 12 86
275 11 82
300 11 78
350 10 72
400 NA 67
450 NA 63
500 NA 59
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 cubic foot per hour = 0.0283 m3/h, 1 pound-force per square inch = 6.8947 kPa, 1 inch water column = 0.249 kPa
Notes:
  1. 1   CTS = Copper tube size.
  2. 2   Table entries are rounded to 3 significant digits.
  3. 3   NA means a flow of less than 10 ft3/h (0.283 m3/h).
TABLE 1315.2(24)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.3(a)]*
GAS: UNDILUTED PROPANE
INLET PRESSURE: 10.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: PIPE SIZING BETWEEN FIRST STAGE (HIGH PRESSURE) REGULATOR AND SECOND STAGE (LOW PRESSURE) REGULATOR
PIPE SIZE (inch)
NOMINAL
INSIDE:
1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 3320 6950 13100 26900 40300 77600 124000 219000 446000
20 2280 4780 9000 18500 27700 53300 85000 150000 306000
30 1830 3840 7220 14800 22200 42800 68200 121000 246000
40 1570 3280 6180 12700 19000 36600 58400 103000 211000
50 1390 2910 5480 11300 16900 32500 51700 91500 187000
60 1260 2640 4970 10200 15300 29400 46900 82900 169000
70 1160 2430 4570 9380 14100 27100 43100 76300 156000
80 1080 2260 4250 8730 13100 25200 40100 70900 145000
90 1010 2120 3990 8190 12300 23600 37700 66600 136000
100 956 2000 3770 7730 11600 22300 35600 62900 128000
125 848 1770 3340 6850 10300 19800 31500 55700 114000
150 768 1610 3020 6210 9300 17900 28600 50500 103000
175 706 1480 2780 5710 8560 16500 26300 46500 94700
200 657 1370 2590 5320 7960 15300 24400 43200 88100
250 582 1220 2290 4710 7060 13600 21700 38300 78100
300 528 1100 2080 4270 6400 12300 19600 34700 70800
350 486 1020 1910 3930 5880 11300 18100 31900 65100
400 452 945 1780 3650 5470 10500 16800 29700 60600
450 424 886 1670 3430 5140 9890 15800 27900 56800
500 400 837 1580 3240 4850 9340 14900 26300 53700
550 380 795 1500 3070 4610 8870 14100 25000 51000
600 363 759 1430 2930 4400 8460 13500 23900 48600
650 347 726 1370 2810 4210 8110 12900 22800 46600
700 334 698 1310 2700 4040 7790 12400 21900 44800
750 321 672 1270 2600 3900 7500 12000 21100 43100
800 310 649 1220 2510 3760 7240 11500 20400 41600
850 300 628 1180 2430 3640 7010 11200 19800 40300
900 291 609 1150 2360 3530 6800 10800 19200 39100
950 283 592 1110 2290 3430 6600 10500 18600 37900
1000 275 575 1080 2230 3330 6420 10200 18100 36900
1100 261 546 1030 2110 3170 6100 9720 17200 35000
1200 249 521 982 2020 3020 5820 9270 16400 33400
1300 239 499 940 1930 2890 5570 8880 15700 32000
1400 229 480 903 1850 2780 5350 8530 15100 30800
1500 221 462 870 1790 2680 5160 8220 14500 29600
1600 213 446 840 1730 2590 4980 7940 14000 28600
1700 206 432 813 1670 2500 4820 7680 13600 27700
1800 200 419 789 1620 2430 4670 7450 13200 26900
1900 194 407 766 1570 2360 4540 7230 12800 26100
2000 189 395 745 1530 2290 4410 7030 12400 25400
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(25)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.3(b)]*
GAS: UNDILUTED PROPANE
INLET PRESSURE: 10.0 psi
PRESSURE DROP: 3.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: PIPE SIZING BETWEEN FIRST STAGE (HIGH PRESSURE) REGULATOR AND SECOND STAGE (LOW PRESSURE) REGULATOR
PIPE SIZE (inch)
NOMINAL
INSIDE:
1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH
(feet)
CAPACITY IN THOUSANDS OF BTU PER HOUR
10 5890 12300 23200 47600 71300 137000 219000 387000 789000
20 4050 8460 15900 32700 49000 94400 150000 266000 543000
30 3250 6790 12800 26300 39400 75800 121000 214000 436000
40 2780 5810 11000 22500 33700 64900 103000 183000 373000
50 2460 5150 9710 19900 29900 57500 91600 162000 330000
60 2230 4670 8790 18100 27100 52100 83000 147000 299000
70 2050 4300 8090 16600 24900 47900 76400 135000 275000
80 1910 4000 7530 15500 23200 44600 71100 126000 256000
90 1790 3750 7060 14500 21700 41800 66700 118000 240000
100 1690 3540 6670 13700 20500 39500 63000 111000 227000
125 1500 3140 5910 12100 18200 35000 55800 98700 201000
150 1360 2840 5360 11000 16500 31700 50600 89400 182000
175 1250 2620 4930 10100 15200 29200 46500 82300 167800
200 1160 2430 4580 9410 14100 27200 43300 76500 156100
250 1030 2160 4060 8340 12500 24100 38400 67800 138400
300 935 1950 3680 7560 11300 21800 34800 61500 125400
350 860 1800 3390 6950 10400 20100 32000 56500 115300
400 800 1670 3150 6470 9690 18700 29800 52600 107300
450 751 1570 2960 6070 9090 17500 27900 49400 100700
500 709 1480 2790 5730 8590 16500 26400 46600 95100
550 673 1410 2650 5450 8160 15700 25000 44300 90300
600 642 1340 2530 5200 7780 15000 23900 42200 86200
650 615 1290 2420 4980 7450 14400 22900 40500 82500
700 591 1240 2330 4780 7160 13800 22000 38900 79300
750 569 1190 2240 4600 6900 13300 21200 37400 76400
800 550 1150 2170 4450 6660 12800 20500 36200 73700
850 532 1110 2100 4300 6450 12400 19800 35000 71400
900 516 1080 2030 4170 6250 12000 19200 33900 69200
950 501 1050 1970 4050 6070 11700 18600 32900 67200
1000 487 1020 1920 3940 5900 11400 18100 32000 65400
1100 463 968 1820 3740 5610 10800 17200 30400 62100
1200 442 923 1740 3570 5350 10300 16400 29000 59200
1300 423 884 1670 3420 5120 9870 15700 27800 56700
1400 406 849 1600 3280 4920 9480 15100 26700 54500
1500 391 818 1540 3160 4740 9130 14600 25700 52500
1600 378 790 1490 3060 4580 8820 14100 24800 50700
1700 366 765 1440 2960 4430 8530 13600 24000 49000
1800 355 741 1400 2870 4300 8270 13200 23300 47600
1900 344 720 1360 2780 4170 8040 12800 22600 46200
2000 335 700 1320 2710 4060 7820 12500 22000 44900
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(26)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.3(c)]*
GAS: UNDILUTED PROPANE
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: PIPE SIZING BETWEEN 2 PSI SERVICE AND LINE PRESSURE REGULATOR
PIPE SIZE (inch)
NOMINAL:
1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH
(feet)
CAPACITY IN THOUSANDS OF BTU PER HOUR
10 2680 5590 10500 21600 32400 62400 99500 176000 359000
20 1840 3850 7240 14900 22300 42900 68400 121000 247000
30 1480 3090 5820 11900 17900 34500 54900 97100 198000
40 1260 2640 4980 10200 15300 29500 47000 83100 170000
50 1120 2340 4410 9060 13600 26100 41700 73700 150000
60 1010 2120 4000 8210 12300 23700 37700 66700 136000
70 934 1950 3680 7550 11300 21800 34700 61400 125000
80 869 1820 3420 7020 10500 20300 32300 57100 116000
90 815 1700 3210 6590 9880 19000 30300 53600 109000
100 770 1610 3030 6230 9330 18000 28600 50600 103000
125 682 1430 2690 5520 8270 15900 25400 44900 91500
150 618 1290 2440 5000 7490 14400 23000 40700 82900
175 569 1190 2240 4600 6890 13300 21200 37400 76300
200 529 1110 2080 4280 6410 12300 19700 34800 71000
250 469 981 1850 3790 5680 10900 17400 30800 62900
300 425 889 1670 3440 5150 9920 15800 27900 57000
350 391 817 1540 3160 4740 9120 14500 25700 52400
400 364 760 1430 2940 4410 8490 13500 23900 48800
450 341 714 1340 2760 4130 7960 12700 22400 45800
500 322 674 1270 2610 3910 7520 12000 21200 43200
550 306 640 1210 2480 3710 7140 11400 20100 41100
600 292 611 1150 2360 3540 6820 10900 19200 39200
650 280 585 1100 2260 3390 6530 10400 18400 37500
700 269 562 1060 2170 3260 6270 9990 17700 36000
750 259 541 1020 2090 3140 6040 9630 17000 34700
800 250 523 985 2020 3030 5830 9300 16400 33500
850 242 506 953 1960 2930 5640 9000 15900 32400
900 235 490 924 1900 2840 5470 8720 15400 31500
950 228 476 897 1840 2760 5310 8470 15000 30500
1000 222 463 873 1790 2680 5170 8240 14600 29700
1100 210 440 829 1700 2550 4910 7830 13800 28200
1200 201 420 791 1620 2430 4680 7470 13200 26900
1300 192 402 757 1550 2330 4490 7150 12600 25800
1400 185 386 727 1490 2240 4310 6870 12100 24800
1500 178 372 701 1440 2160 4150 6620 11700 23900
1600 172 359 677 1390 2080 4010 6390 11300 23000
1700 166 348 655 1340 2010 3880 6180 10900 22300
1800 161 337 635 1300 1950 3760 6000 10600 21600
1900 157 327 617 1270 1900 3650 5820 10300 21000
2000 152 318 600 1230 1840 3550 5660 10000 20400
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(27)
SCHEDULE 40 METALLIC PIPE [NFPA 54: TABLE 6.3(d)]*
GAS: UNDILUTED PROPANE
INLET PRESSURE: 11.0 in. w.c.
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 1.50
INTENDED USE: PIPE SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE
PIPE SIZE (inch)
NOMINAL
INSIDE:
1/2 3/4 1 11/4 11/2 2 21/2 3 4
ACTUAL: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH
(feet)
CAPACITY IN THOUSANDS OF BTU PER HOUR
10 291 608 1150 2350 3520 6790 10800 19100 39000
20 200 418 787 1620 2420 4660 7430 13100 26800
30 160 336 632 1300 1940 3750 5970 10600 21500
40 137 287 541 1110 1660 3210 5110 9030 18400
50 122 255 480 985 1480 2840 4530 8000 16300
60 110 231 434 892 1340 2570 4100 7250 14800
80 101 212 400 821 1230 2370 3770 6670 13600
100 94 197 372 763 1140 2200 3510 6210 12700
125 89 185 349 716 1070 2070 3290 5820 11900
150 84 175 330 677 1010 1950 3110 5500 11200
175 74 155 292 600 899 1730 2760 4880 9950
200 67 140 265 543 814 1570 2500 4420 9010
250 62 129 243 500 749 1440 2300 4060 8290
300 58 120 227 465 697 1340 2140 3780 7710
350 51 107 201 412 618 1190 1900 3350 6840
400 46 97 182 373 560 1080 1720 3040 6190
450 42 89 167 344 515 991 1580 2790 5700
500 40 83 156 320 479 922 1470 2600 5300
550 37 78 146 300 449 865 1380 2440 4970
600 35 73 138 283 424 817 1300 2300 4700
650 33 70 131 269 403 776 1240 2190 4460
700 32 66 125 257 385 741 1180 2090 4260
750 30 64 120 246 368 709 1130 2000 4080
800 29 61 115 236 354 681 1090 1920 3920
850 28 59 111 227 341 656 1050 1850 3770
900 27 57 107 220 329 634 1010 1790 3640
950 26 55 104 213 319 613 978 1730 3530
1000 25 53 100 206 309 595 948 1680 3420
1100 25 52 97 200 300 578 921 1630 3320
1200 24 50 95 195 292 562 895 1580 3230
1300 23 48 90 185 277 534 850 1500 3070
1400 22 46 86 176 264 509 811 1430 2930
1500 21 44 82 169 253 487 777 1370 2800
1600 20 42 79 162 243 468 746 1320 2690
1700 19 40 76 156 234 451 719 1270 2590
1800 19 39 74 151 226 436 694 1230 2500
1900 18 38 71 146 219 422 672 1190 2420
2000 18 37 69 142 212 409 652 1150 2350
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 inch water column = 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1315.2(28)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.3(e)]2
GAS: UNDILUTED PROPANE
INLET PRESSURE: 10.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: TUBE SIZING BETWEEN FIRST STAGE (HIGH PRESSURE) REGULATOR AND SECOND STAGE (LOW PRESSURE) REGULATOR
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 513 1060 2150 3760 5330 11400 20500 32300 67400
20 352 727 1480 2580 3670 7830 14100 22200 46300
30 283 584 1190 2080 2940 6290 11300 17900 37200
40 242 500 1020 1780 2520 5380 9690 15300 31800
50 215 443 901 1570 2230 4770 8590 13500 28200
60 194 401 816 1430 2020 4320 7780 12300 25600
70 179 369 751 1310 1860 3980 7160 11300 23500
80 166 343 699 1220 1730 3700 6660 10500 21900
90 156 322 655 1150 1630 3470 6250 9850 20500
100 147 304 619 1080 1540 3280 5900 9310 19400
125 131 270 549 959 1360 2910 5230 8250 17200
150 118 244 497 869 1230 2630 4740 7470 15600
175 109 225 457 799 1130 2420 4360 6880 14300
200 101 209 426 744 1060 2250 4060 6400 13300
250 90 185 377 659 935 2000 3600 5670 11800
300 81 168 342 597 847 1810 3260 5140 10700
350 75 155 314 549 779 1660 3000 4730 9840
400 70 144 292 511 725 1550 2790 4400 9160
450 65 135 274 480 680 1450 2620 4130 8590
500 62 127 259 453 643 1370 2470 3900 8120
550 59 121 246 430 610 1300 2350 3700 7710
600 56 115 235 410 582 1240 2240 3530 7350
650 54 111 225 393 558 1190 2140 3380 7040
700 51 106 216 378 536 1140 2060 3250 6770
750 50 102 208 364 516 1100 1980 3130 6520
800 48 99 201 351 498 1060 1920 3020 6290
850 46 96 195 340 482 1030 1850 2920 6090
900 45 93 189 330 468 1000 1800 2840 5910
950 44 90 183 320 454 970 1750 2750 5730
1000 42 88 178 311 442 944 1700 2680 5580
1100 40 83 169 296 420 896 1610 2540 5300
1200 38 79 161 282 400 855 1540 2430 5050
1300 37 76 155 270 383 819 1470 2320 4840
1400 35 73 148 260 368 787 1420 2230 4650
1500 34 70 143 250 355 758 1360 2150 4480
1600 33 68 138 241 343 732 1320 2080 4330
1700 32 66 134 234 331 708 1270 2010 4190
1800 31 64 130 227 321 687 1240 1950 4060
1900 30 62 126 220 312 667 1200 1890 3940
2000 29 60 122 214 304 648 1170 1840 3830
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 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. 2   Table entries are rounded to 3 significant digits.
TABLE 1315.2(29)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.3(f)]2, 3
GAS: UNDILUTED PROPANE
INLET PRESSURE: 11.0 in. w.c.
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 1.50
INTENDED USE: TUBE SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 45 93 188 329 467 997 1800 2830 5890
20 31 64 129 226 321 685 1230 1950 4050
30 25 51 104 182 258 550 991 1560 3250
40 21 44 89 155 220 471 848 1340 2780
50 19 39 79 138 195 417 752 1180 2470
60 17 35 71 125 177 378 681 1070 2240
70 16 32 66 115 163 348 626 988 2060
80 15 30 61 107 152 324 583 919 1910
90 14 28 57 100 142 304 547 862 1800
100 13 27 54 95 134 287 517 814 1700
125 11 24 48 84 119 254 458 722 1500
150 10 21 44 76 108 230 415 654 1360
175 NA 20 40 70 99 212 382 602 1250
200 NA 18 37 65 92 197 355 560 1170
250 NA 16 33 58 82 175 315 496 1030
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
1000 NA NA 16 27 39 83 149 234 488
1100 NA NA 15 26 37 78 141 223 464
1200 NA NA 14 25 35 75 135 212 442
1300 NA NA 14 24 34 72 129 203 423
1400 NA NA 13 23 32 69 124 195 407
1500 NA NA 13 22 31 66 119 188 392
1600 NA NA 12 21 30 64 115 182 378
1700 NA NA 12 20 29 62 112 176 366
1800 NA NA 11 20 28 60 108 170 355
1900 NA NA 11 19 27 58 105 166 345
2000 NA NA 11 19 27 57 102 161 335
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 inch water column = 0.249 kPa
Notes:
  1. 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. 2   Table entries are rounded to 3 significant digits.
  3. 3   NA means a flow of less than 10000 Btu/h (2.93 kW).
TABLE 1315.2(30)
SEMI-RIGID COPPER TUBING [NFPA 54: TABLE 6.3(g)]2
GAS: UNDILUTED PROPANE
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: TUBE SIZING BETWEEN 2 PSIG SERVICE AND LINE PRESSURE REGULATOR
TUBE SIZE (inch)
NOMINAL: K & L: 1/4 3/8 1/2 5/8 3/4 1 11/4 11/2 2
ACR: 3/8 1/2 5/8 3/4 7/8 11/8 13/8 - -
OUTSIDE: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
INSIDE:1 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 413 852 1730 3030 4300 9170 16500 26000 54200
20 284 585 1190 2080 2950 6310 11400 17900 37300
30 228 470 956 1670 2370 5060 9120 14400 29900
40 195 402 818 1430 2030 4330 7800 12300 25600
50 173 356 725 1270 1800 3840 6920 10900 22700
60 157 323 657 1150 1630 3480 6270 9880 20600
70 144 297 605 1060 1500 3200 5760 9090 18900
80 134 276 562 983 1390 2980 5360 8450 17600
90 126 259 528 922 1310 2790 5030 7930 16500
100 119 245 498 871 1240 2640 4750 7490 15600
125 105 217 442 772 1100 2340 4210 6640 13800
150 95 197 400 700 992 2120 3820 6020 12500
175 88 181 368 644 913 1950 3510 5540 11500
200 82 168 343 599 849 1810 3270 5150 10700
250 72 149 304 531 753 1610 2900 4560 9510
300 66 135 275 481 682 1460 2620 4140 8610
350 60 124 253 442 628 1340 2410 3800 7920
400 56 116 235 411 584 1250 2250 3540 7370
450 53 109 221 386 548 1170 2110 3320 6920
500 50 103 209 365 517 1110 1990 3140 6530
550 47 97 198 346 491 1050 1890 2980 6210
600 45 93 189 330 469 1000 1800 2840 5920
650 43 89 181 316 449 959 1730 2720 5670
700 41 86 174 304 431 921 1660 2620 5450
750 40 82 168 293 415 888 1600 2520 5250
800 39 80 162 283 401 857 1540 2430 5070
850 37 77 157 274 388 829 1490 2350 4900
900 36 75 152 265 376 804 1450 2280 4750
950 35 72 147 258 366 781 1410 2220 4620
1000 34 71 143 251 356 760 1370 2160 4490
1100 32 67 136 238 338 721 1300 2050 4270
1200 31 64 130 227 322 688 1240 1950 4070
1300 30 61 124 217 309 659 1190 1870 3900
1400 28 59 120 209 296 633 1140 1800 3740
1500 27 57 115 201 286 610 1100 1730 3610
1600 26 55 111 194 276 589 1060 1670 3480
1700 26 53 108 188 267 570 1030 1620 3370
1800 25 51 104 182 259 553 1000 1570 3270
1900 24 50 101 177 251 537 966 1520 3170
2000 23 48 99 172 244 522 940 1480 3090
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 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. 2   Table entries are rounded to 3 significant digits.
TABLE 1315.2(31)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.3(h)]1, 2
GAS: UNDILUTED PROPANE
INLET PRESSURE: 11.0 in. w.c.
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 1.50
INTENDED USE: CSST SIZING BETWEEN SINGLE OR SECOND STAGE (LOW PRESSURE) REGULATOR AND APPLIANCE SHUTOFF VALVE
TUBE SIZE (EHD)3
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 39 46 48 60 62
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
5 72 99 181 211 355 426 744 863 1420 1638 2830 3270 5780 6550
10 50 69 129 150 254 303 521 605 971 1179 1990 2320 4110 4640
15 39 55 104 121 208 248 422 490 775 972 1620 1900 3370 3790
20 34 49 91 106 183 216 365 425 661 847 1400 1650 2930 3290
25 30 42 82 94 164 192 325 379 583 762 1250 1480 2630 2940
30 28 39 74 87 151 177 297 344 528 698 1140 1350 2400 2680
40 23 33 64 74 131 153 256 297 449 610 988 1170 2090 2330
50 20 30 58 66 118 137 227 265 397 548 884 1050 1870 2080
60 19 26 53 60 107 126 207 241 359 502 805 961 1710 1900
70 17 25 49 57 99 117 191 222 330 466 745 890 1590 1760
80 15 23 45 52 94 109 178 208 307 438 696 833 1490 1650
90 15 22 44 50 90 102 169 197 286 414 656 787 1400 1550
100 14 20 41 47 85 98 159 186 270 393 621 746 1330 1480
150 11 15 31 36 66 75 123 143 217 324 506 611 1090 1210
200 9 14 28 33 60 69 112 129 183 283 438 531 948 1050
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 units: 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 inch water column = 0.249 kPa
Notes:
  1. 1   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  2. 2   Table entries are rounded to 3 significant digits.
  3. 3   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.
TABLE 1315.2(32)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.3(i)]1, 2, 3, 4
GAS: UNDILUTED PROPANE
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: CSST SIZING BETWEEN 2 PSI SERVICE AND LINE PRESSURE REGULATOR
TUBE SIZE (EHD)5
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 39 46 48 60 62
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 426 558 927 1110 1740 2170 4100 4720 7130 7958 15200 16800 29400 34200
25 262 347 591 701 1120 1380 2560 2950 4560 5147 9550 10700 18800 21700
30 238 316 540 640 1030 1270 2330 2690 4180 4719 8710 9790 17200 19800
40 203 271 469 554 896 1100 2010 2320 3630 4116 7530 8500 14900 17200
50 181 243 420 496 806 986 1790 2070 3260 3702 6730 7610 13400 15400
75 147 196 344 406 663 809 1460 1690 2680 3053 5480 6230 11000 12600
80 140 189 333 393 643 768 1410 1630 2590 2961 5300 6040 10600 12200
100 124 169 298 350 578 703 1260 1450 2330 2662 4740 5410 9530 10900
150 101 137 245 287 477 575 1020 1180 1910 2195 3860 4430 7810 8890
200 86 118 213 248 415 501 880 1020 1660 1915 3340 3840 6780 7710
250 77 105 191 222 373 448 785 910 1490 1722 2980 3440 6080 6900
300 69 96 173 203 343 411 716 829 1360 1578 2720 3150 5560 6300
400 60 82 151 175 298 355 616 716 1160 1376 2350 2730 4830 5460
500 53 72 135 158 268 319 550 638 1030 1237 2100 2450 4330 4880
For SI units: 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 1   Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 0.5 psi (3.4 kPa) [based on 13 inch water column (3.2 kPa) outlet pressure], DO NOT use THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator are capable of varying with flow rate.
  2. 2   CAUTION: Capacities shown in table are capable of exceeding the maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.
  3. 3   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  4. 4   Table entries are rounded to 3 significant digits.
  5. 5   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.
TABLE 1315.2(33)
CORRUGATED STAINLESS STEEL TUBING (CSST) [NFPA 54: TABLE 6.3(j)]1, 2, 3, 4
GAS: UNDILUTED PROPANE
INLET PRESSURE: 5.0 psi
PRESSURE DROP: 3.5 psi
SPECIFIC GRAVITY: 1.50
TUBE SIZE (EHD)5
FLOW DESIGNATION: 13 15 18 19 23 25 30 31 37 39 46 48 60 62
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 826 1070 1710 2060 3150 4000 7830 8950 13100 14441 28600 31200 54400 63800
25 509 664 1090 1310 2040 2550 4860 5600 8400 9339 18000 19900 34700 40400
30 461 603 999 1190 1870 2340 4430 5100 7680 8564 16400 18200 31700 36900
40 396 520 867 1030 1630 2030 3820 4400 6680 7469 14200 15800 27600 32000
50 352 463 777 926 1460 1820 3410 3930 5990 6717 12700 14100 24700 28600
75 284 376 637 757 1210 1490 2770 3190 4920 5539 10300 11600 20300 23400
80 275 363 618 731 1170 1450 2680 3090 4770 5372 9990 11200 19600 22700
100 243 324 553 656 1050 1300 2390 2760 4280 4830 8930 10000 17600 20300
150 196 262 453 535 866 1060 1940 2240 3510 3983 7270 8210 14400 16600
200 169 226 393 464 755 923 1680 1930 3050 3474 6290 7130 12500 14400
250 150 202 352 415 679 828 1490 1730 2740 3124 5620 6390 11200 12900
300 136 183 322 379 622 757 1360 1570 2510 2865 5120 5840 10300 11700
400 117 158 279 328 542 657 1170 1360 2180 2498 4430 5070 8920 10200
500 104 140 251 294 488 589 1050 1210 1950 2247 3960 4540 8000 9110
For SI units: 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
Notes:
  1. 1   Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 0.5 psi (3.4 kPa) [based on 13 inch water column (3.2 kPa) outlet pressure], DO NOT USE THIS TABLE. Consult with regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator are capable of varying with flow rate.
  2. 2   CAUTION: Capacities shown in table are capable of exceeding the maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.
  3. 3   Table includes losses for four 90 degree (1.57 rad) bends and two end fittings. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the following equation: L = 1.3 n, where L is additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  4. 4   Table entries are rounded to 3 significant digits.
  5. 5   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.
TABLE 1315.2(34)
POLYETHYLENE PLASTIC PIPE [NFPA 54: TABLE 6.3(k)]*
GAS: UNDILUTED PROPANE
INLET PRESSURE: 11.0 in. w.c.
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 1.50
INTENDED USE: PE SIZING BETWEEN INTEGRAL SECOND-STAGE REGULATOR AT TANK OR SECOND-STAGE
(LOW PRESSURE) REGULATOR AND BUILDING
PIPE SIZE (inch)
NOMINAL OD: 1/2 3/4 1 11/4 11/2 2 3 4
DESIGNATION: SDR 9.3 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
ACTUAL ID: 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 340 680 1230 2130 3210 5770 16000 30900
20 233 468 844 1460 2210 3970 11000 21200
30 187 375 677 1170 1770 3180 8810 17000
40 160 321 580 1000 1520 2730 7540 14600
50 142 285 514 890 1340 2420 6680 12900
60 129 258 466 807 1220 2190 6050 11700
70 119 237 428 742 1120 2010 5570 10800
80 110 221 398 690 1040 1870 5180 10000
90 103 207 374 648 978 1760 4860 9400
100 98 196 353 612 924 1660 4590 8900
125 87 173 313 542 819 1470 4070 7900
150 78 157 284 491 742 1330 3690 7130
175 72 145 261 452 683 1230 3390 6560
200 67 135 243 420 635 1140 3160 6100
250 60 119 215 373 563 1010 2800 5410
300 54 108 195 338 510 916 2530 4900
350 50 99 179 311 469 843 2330 4510
400 46 92 167 289 436 784 2170 4190
450 43 87 157 271 409 736 2040 3930
500 41 82 148 256 387 695 1920 3720
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 inch water column = 0.249 kPa
* Table entries are rounded to 3 significant digits.
TABLE 1315.2(35)
POLYETHYLENE PLASTIC PIPE [NFPA 54: TABLE 6.3(l)]*
GAS: UNDILUTED PROPANE
INLET PRESSURE: 2.0 psi
PRESSURE DROP: 1.0 psi
SPECIFIC GRAVITY: 1.50
INTENDED USE: PE PIPE SIZING BETWEEN 2 PSI SERVICE REGULATOR AND LINE PRESSURE REGULATOR
PIPE SIZE (inch)
NOMINAL OD: 1/2 3/4 1 11/4 11/2 2 3 4
DESIGNATION: SDR 9.3 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
ACTUAL ID: 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 3130 6260 11300 19600 29500 53100 147000 284000
20 2150 4300 7760 13400 20300 36500 101000 195000
30 1730 3450 6230 10800 16300 29300 81100 157000
40 1480 2960 5330 9240 14000 25100 69400 134100
50 1310 2620 4730 8190 12400 22200 61500 119000
60 1190 2370 4280 7420 11200 20100 55700 108000
70 1090 2180 3940 6830 10300 18500 51300 99100
80 1010 2030 3670 6350 9590 17200 47700 92200
90 952 1910 3440 5960 9000 16200 44700 86500
100 899 1800 3250 5630 8500 15300 42300 81700
125 797 1600 2880 4990 7530 13500 37500 72400
150 722 1450 2610 4520 6830 12300 33900 65600
175 664 1330 2400 4160 6280 11300 31200 60300
200 618 1240 2230 3870 5840 10500 29000 56100
250 548 1100 1980 3430 5180 9300 25700 49800
300 496 994 1790 3110 4690 8430 23300 45100
350 457 914 1650 2860 4320 7760 21500 41500
400 425 851 1530 2660 4020 7220 12000 38600
450 399 798 1440 2500 3770 6770 18700 36200
500 377 754 1360 2360 3560 6390 17700 34200
550 358 716 1290 2240 3380 6070 16800 32500
600 341 683 1230 2140 3220 5790 16000 31000
650 327 654 1180 2040 3090 5550 15400 29700
700 314 628 1130 1960 2970 5330 14700 28500
750 302 605 1090 1890 2860 5140 14200 27500
800 292 585 1050 1830 2760 4960 13700 26500
850 283 566 1020 1770 2670 4800 13300 25700
900 274 549 990 1710 2590 4650 12900 24900
950 266 533 961 1670 2520 4520 12500 24200
1000 259 518 935 1620 2450 4400 12200 23500
1100 246 492 888 1540 2320 4170 11500 22300
1200 234 470 847 1470 2220 3980 11000 21300
1300 225 450 811 1410 2120 3810 10600 20400
1400 216 432 779 1350 2040 3660 10100 19600
1500 208 416 751 1300 1960 3530 9760 18900
1600 201 402 725 1260 1900 3410 9430 18200
1700 194 389 702 1220 1840 3300 9130 17600
1800 188 377 680 1180 1780 3200 8850 17100
1900 183 366 661 1140 1730 3110 8590 16600
2000 178 356 643 1110 1680 3020 8360 16200
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 pound-force per square inch = 6.8947 kPa
* Table entries are rounded to 3 significant digits.
TABLE 1315.2(36)
POLYETHYLENE PLASTIC TUBING [NFPA 54: TABLE 6.3(m)]2
GAS: UNDILUTED PROPANE
INLET PRESSURE: 11.0 in. w.c.
PRESSURE DROP: 0.5 in. w.c.
SPECIFIC GRAVITY: 1.50
INTENDED USE: PE TUBE SIZING BETWEEN INTEGRAL
SECOND-STAGE REGULATOR AT TANK OR SECOND-STAGE (LOW PRESSURE)
REGULATOR AND BUILDING
PLASTIC TUBING SIZE (CTS)1 (inch)
NOMINAL OD: 1/2 1
DESIGNATION: SDR 7 SDR 11
ACTUAL ID: 0.445 0.927
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU 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 units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 inch water column = 0.249 kPa
Notes:
  1. 1   CTS = Copper tube size.
  2. 2   Table entries are rounded to 3 significant digits.
The inside diameter of smooth wall pipe or tubing shall be determined by Equation 1315.3(1), Equation 1315.3(2), Table 1315.3, and using the equivalent pipe length determined by Section 1315.1.1 through Section 1315.1.3. [NFPA 54:6.4]

EQUATION 1315.3(1)
LOW-PRESSURE GAS FORMULA (LESS THAN 1.5 psi)
[NFPA 54:6.4.1]

Where:
D = inside diameter of pipe, inches
Q = input rate appliance(s), cubic feet per hour at 60°F
and 30 inch mercury column
L = equivalent length of pipe, feet
ΔH = pressure drop, in. water column
Cr = in accordance with Table 1315.3

EQUATION 1315.3(2)
HIGH-PRESSURE GAS FORMULA (1.5 psi AND ABOVE)
[NFPA 54:6.4.2]



Where:
D = inside diameter of pipe, inches
Q = input rate of appliance(s), cubic feet per hour at 60°F
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
Cr = in accordance with Table 1315.3
Y = in accordance with Table 1315.3
For SI units: 1 cubic foot = 0.0283 m3, 1000 British thermal units per hour = 0.293 kW, 1 inch = 25 mm, 1 foot = 304.8 mm, 1 pound-force per square inch = 6.8947 kPa, °C = (°F-32)/1.8, 1 inch mercury column = 3.39 kPa, 1 inch water column = 0.249 kPa

TABLE 1315.3
Cr AND Y FOR NATURAL GAS AND UNDILUTED
PROPANE AT STANDARD CONDITIONS
[NFPA 54: TABLE 6.4.2]
GAS FORMULA FACTORS
Cr Y
Natural Gas 0.6094 0.9992
Undiluted Propane 1.2462 0.9910
To determine the size of each section of pipe in a system within the range of Table 1315.2(1) through Table 1315.2(36), proceed as follows:
  1. Measure the length of the pipe from the gas meter location to the most remote outlet on the system.
  2. Select the length in feet column and row showing the distance, or the next longer distance where the table does not give the exact length.
  3. Starting at the most remote outlet, find in the just selected the gas demand for that outlet. Where the exact figure of demand is not shown, choose the next larger figure in the row.
  4. At the top of the column in the table will be found the correct size of pipe.
  5. Using this same row, proceed in a similar manner for each section of pipe serving this outlet. For each section of pipe, determine the total gas demand supplied by that section. Where gas piping sections serve both heating and cooling appliances and the installation prevents both units from operating simultaneously, the larger of the two demand loads needs to be used in sizing these sections.
  6. Size each section of branch piping not previously sized by measuring the distance from the gas meter location to the most remote outlet in that branch and follow the procedures of steps 2, 3, 4, and 5 above. Size branch piping in the order of their distance from the meter location, beginning with the most distant outlet not previously sized.
For conditions other than those covered by Section 1315.1, such as longer runs or greater gas demands, the size of each gas piping system shall be determined by standard engineering methods acceptable to the Authority Having Jurisdiction, and each such system shall be so designed that the total pressure drop between the meter or other point of supply and an outlet where full demand is being supplied to outlets, shall be in accordance with the requirements of Section 1308.4.
Where the supply gas pressure exceeds 5 psi (34 kPa) for natural gas and 10 psi (69 kPa) for undiluted propane or is less than 6 inches (1.5 kPa) of water column, or where diversity demand factors are used, the design, pipe, sizing, materials, location, and use of such systems first shall be approved by the Authority Having Jurisdiction. Piping systems designed for pressures exceeding the serving gas supplier's standard delivery pressure shall have prior verification from the gas supplier of the availability of the design pressure.
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