CODES

ADOPTS WITH AMENDMENTS:

2018 Uniform Plumbing Code

Heads up: There are no suggested sections in this chapter.
Heads up: There are no amended sections in this chapter.
CALIFORNIA PLUMBING CODE - MATRIX ADOPTION TABLE
CHAPTER 12 - 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
Adopt Entire Chapter as amended (amended sections listed below) X X X
Adopt only those sections that are listed below
Chapter/Section
1211.6 X X X
1211.7 X X
The 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 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 and before such piping has been covered or concealed or 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 1213.1. Test gauges used in conducting tests shall be in accordance with Section 318.0.
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 preceding 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 to be assured that the work has been performed in accordance with the intent of this code.
Whereupon 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 is furnishing gas, to turn on or cause to be turned on, a 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 and when 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 not to exceed that designated by the Authority Having Jurisdiction, provided that such gas piping system otherwise is in accordance with 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 54:5.1.2.1 — 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 54:5.3.2.1 — 5.3.2.2]
Gas piping systems shall be of such size and so installed as to provide a supply gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance. [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 1208.4.1 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 piping sizing, assuming all the 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 1208.4.1
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
100 000
  Multifamily, per unit
60 000
Hydronic boiler
  Single family
100 000
  Multifamily, per unit 60 000
Space and Water Heating Units
Hydronic boiler
  Single-family
120 000
  Multifamily, per unit 75 000
Water Heating Appliances
Water heater, automatic storage
  30 to 40 gallon tank 35 000
Water heater, automatic storage
  50 gallon tank
50 000
Water heater, automatic instantaneous
  Capacity at 2 gallons per minute 142 800
  Capacity at 4 gallons per minute
285 000
  Capacity at 6 gallons per minute 428 400
Water heater, domestic, circulating or side-arm 35 000
Cooking Appliances
Range, freestanding, domestic 65 000
Built-in oven or broiler unit, domestic 25 000
Built-in top unit, domestic 40 000
Other Appliances
Refrigerator 3000
Clothes dryer, Type I (domestic) 35 000
Gas fireplace direct vent 40 000
Gas log 80 000
Barbecue 40 000
Gaslight 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 installation 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]
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]
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 approved 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 at least of 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 if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet (scf) 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. [NFPA 54:5.6.2.3 — 5.6.2.4]

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, 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. [NFPA 54:5.6.3.2]
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." Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) plastic pipe, tubing, and fittings shall not be used to supply fuel gas. [NFPA 54.5.6.4.1.1 — 5.6.4.1.3]
Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC conforming to UL 651 (Schedule 40 and 80). PVC vent piping shall not be installed indoors. [NFPA 54:5.6.4.2]
Anodeless risers shall comply with the following:
  1. Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak-tested by the manufacturer in accordance with written procedures.
  2. Service head adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used and shall be design-certified to be in accordance with the requirements of Category I of ASTM D2513. The manufacturer shall provide the user qualified installation instructions.
  3. 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 1208.6.10.2. [NFPA 54:5.6.7.3]

TABLE 1208.6.10.2
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 that comply 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. [NFPA 54:5.6.8.1]
Tubing joints shall 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 that comply 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 only 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 larger than 4 inches (100 mm) shall not be used unless approved by the Authority Having Jurisdiction.
  2. Fittings used with steel or wrought-iron pipe shall be steel, copper alloy, 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. Approved by the Authority Having Jurisdiction. [NFPA 54:5.6.8.4 (1-8)]
Plastic pipe, tubing, and fittings shall be installed in accordance with the manufacturer's installation instructions. Section 1208.6.12.1 through Section 1208.6.12.4 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 above ground 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 flanged joint is separated, the gasket shall be replaced. [NFPA 54:5.6.11.2.4]
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 furn 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 exceeds 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 1208.6 through Section 1208.6.12.3.

    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 a 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 507.21. [NFPA 54:5.8.5.2]
The discharge of vents shall be in accordance with the following requirements:
  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. Discharge stacks or vents shall be designed to prevent the entry of water, insects, or other foreign material that could cause a blockage.
  2. 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 (3.5 kPa) 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 (3.5 kPa) or less are required to be equipped with overpressure protection by Section 1208.9, each overpressure protection device shall be adjusted to limit the gas pressure to each connected appliance to 2 psi (14 kPa) 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 (3.5 kPa) are required to be equipped with overpressure protection by Section 1208.9, each over-pressure 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 1208.10 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 54:5.10.1.1 — 5.10.1.2]

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 if the operation of the appliance or equipment is such that it could produce 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 sufficient 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 sufficient clearance or shall be insulated from sources of heat 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 (A)(B)]
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 1210.1.3.1 through Section 1210.1.3.9.[NFPA54:7.1.3]
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 a 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 1210.1.3.3 or Section 1210.1.3.6. [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 1210.1.3.4(1) and Section 1210.1.3.4(2), periodic follow-up testing shall be performed at intervals not to exceed 36 months. [NFPA54:7.1.3.4]
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 1210.1.3.4(1) and Section 1210.1.3.4(2), and the results shall comply with Section 1210.1.3.3. [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 tha 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, the 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 1210.1.6.1 or Section 1210.1.6.2.
  2. A piping or 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 a 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 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 54:7.2.2.1 — 7.2.2.2]
Piping for other than dry gas conditions shall be sloped not less than 1/4 inch in 15 feet (6.4 mm in 4.6 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 506.0 or to above-ceiling spaces in accordance with Section 1210.2.2.1.
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 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 exceed the distance shown in Table 1210.2.4.1. Spacing of supports for CSST shall be in accordance with the CSST manufacturer's instructions. [NFPA 54:7.2.5.2]

TABLE 1210.2.4.1
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) 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 1210.2.4.1. [NFPA 54:7.2.5.4]
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 1208.6.11.2).
  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 the 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 similar construction features.
  2. The tubing is installed in single runs and is 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 minimum damage to the building. Where piping in floor channels is exposed to excessive moisture or corrosive substances, the piping shall be protected in an approved manner.

      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 11/2 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 1208.6.9. Piping shall not be embedded in concrete slabs containing quick-set additives or cinder aggregate. [NFPA 54:7.3.5.1 — 7.3.5.2]
Where gas piping exceeding 5 psi (34 kPa) is located within vertical chases in accordance with Section 1208.5(2), the requirements of Section 1210.4.1 through Section 1210.4.3 shall apply. [NFPA 54:7.4]
Where pressure reduction is required in branch connections for compliance with Section 1208.5, 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 1208.8.4 and Section 1208.9 through Section 1208.10.4. 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]
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 with bending equipment and procedures intended for that purpose.
  2. 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. The pipe shall not be bent through an arc of more than 90 degrees (1.57 rad).
  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 at least 1 inch (25.4 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 a 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 so installed 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 1212.9. [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 1210.7(4) and Section 1210.7(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. Where 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 1212.3.1 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]
Where a branch outlet is placed on the 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 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 are 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 an allowance in the piping system design has been made for such a device and where approved by the Authority Having Jurisdiction. [NFPA 54:7.1O]
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 1210.12.1 through Section 1210.12.6.
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 (65 mm) nominal pipe size (NPS) 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 NFPA 70, 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 NFPA 70 for hazardous locations.
  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 21/2 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 a 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 where 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 (22 875 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 NFPA 70. [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 the wiring and electrically operated control devices in a piping system shall conform to the requirements of 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 will shut off (fail safe) the flow of gas in the event of current failure. [NFPA 54:7.15.2]
Earthquake-actuated gas shutoff valves designed to automatically shut off the gas at the location of the valve in the event of a seismic disturbance and certified by the State Architect as conforming to California Code of Regulations, Title 24, Part 12, Chapter 12-16-1, shall be provided for buildings when such installation is required by local ordinance. Earthquake-actuated gas shutoff valves which have not been certified by the State Architect shall be prohibited in buildings open to the public under mandatory installation by local ordinance. Installation of the valves shall be in accordance with local ordinance, and in the absence of such per the manufacturers installation instructions.
Appliances and equipment shall be connected to the building piping in compliance with Section 1212.5 through Section 1212.8 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 1212.3.
  7. Unlisted gas hose connectors for use in laboratories and educational facilities in accordance with Section 1212.4. [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 installed in accordance with the manufacturer's installation instructions and in accordance with Section 1212.3.1 and Section 1212.3.2. [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 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)]
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 non-displaceable valve member shall be installed upstream of the quick-disconnect device. [NFPA 54:9.6.6.1 — 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, 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 1212.9, 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. [NFPA 54:9.6.8)


For SI units: 1 inch= 25.4 mm
FIGURE 1212.9
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 appliance. [NFPA 54:9.6.9]
Liquefied petroleum gas facilities shall be in accordance 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 appliances 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 1213.2.1 through Section 1213.2.6.
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, where 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 outlet(s). [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 pressure (3.5 kPa), 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 not less than 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 tests shall be in accordance with Section 318.0.
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 1213.0. [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 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 in accordance with Section 1213.5.2; connections to the appliance are checked for leakage and purged in accordance with Section 1213.6. [NFPA 54:8.2.4]
The purging of piping shall be in accordance with Section 1213.6.1 through Section 1213.6.3. [NFPA 54:8.3]
The purging of piping systems shall be in accordance with the provisions of Section 1213.6.1.1 through Section 1213.6.1.5 where the piping system meets either of the following:
  1. The design operating gas pressure is greater than 2 psig (14 kPa).
  2. The piping being purged contains one or more sections of pipe or tubing meeting the size and length criteria of Table 1213.6.1. [NFPA 54:8.3.1]
TABLE 1213.6.1
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 1213.6.1.4. Where gas piping meeting the criteria of Table 1213.6.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas. [NFPA54:8.3.1.1]
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.
Where gas piping containing air and meeting the criteria of Table 1213.6.1 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 1213.6.1.4. [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 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 is in accordance with Section 1213.6.1.5.
  4. Purging operations introducing fuel gas shall be stopped where 90 percent fuel gas by volume is detected within the pipe.
  5. Persons not involved in the purging operations shall be evacuated from 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 1213.6.2.1 where the piping system meets both of the following:
  1. The design operating pressure is 2 psig (14 kPa) or less.
  2. The piping being purged is constructed entirely from pipe or tubing not meeting the size and length criteria of Table 1213.6.1. [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 1213.6.2.2. Purging shall be stopped where 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 1215.0, shall be the standard for the installation of gas piping. Natural gas regulations and tables are based on the use of a 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 specific gravity conversion factors provided by the serving gas supplier shall be used 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 specified, Table 1208.4.1 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 in diameter (15 mm).

      The size of a piping outlet for a mobile home shall be not less than 3/4 of an inch in diameter (20 mm).
Where the pipe size is to be determined using any of the methods in Section 1215.1.1 through Section 1215.1.3, the diameter of each pipe segment shall be obtained from the pipe sizing tables in Section 1215.2 or the sizing equations in Section 1215.3. [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 (see calculation example in Figure 1215.1.1]. [NFPA 54:6.1.1]

FIGURE 1215.1.1
EXAMPLE ILLUSTRATING USE OF TABLE 1208.4.1 AND TABLE 1215.2(1)
Problem: Determine the required pipe size of each section and outlet of the piping system shown in Figure 1215.1.1. 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 mm3/h

Solution:
  1. Maximum gas demand of Outlet A —
        32 cubic feet per hour (0.91 m3/h) (from Table 1208.4.1).
    Maximum gas demand of Outlet B —
        3 cubic feet per hour (0.08 m3/h) (from Table 1208.4.1).
    Maximum gas demand of Outlet C —
        59 cubic feet per hour (l .67 m3/h) (from Table 1208.4.1).
    Maximum gas demand of Outlet D —
        136 cubic feet per hour (3.85 m3/h) [150 000 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 ( 18 288 mm).
  3. Using the length in feet column row marked 60 feet (18 288 mm) in Table 1215.2(1):
    1. Outlet A, supplying 32 cubic feet per hour (0.91 m3/h), requires 1/2 of an inch (15 mm) pipe.
    2. 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.
    3. 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.
    4. 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 (18 288 mm) in Table 1215.2(1) [no column for actual length of 55 feet (16 764 mm)]:
    1. Outlet B supplying 3 cubic feet per hour (0.08 m3/h), requires 1/2 of an inch (15 mm) pipe.
    2. Outlet C, supplying 59 cubic feet per hour ( 1.67 m3/h), requires 1/2 of an inch ( 15 mm) pipe.
  5. Using the column marked 60 feet (18 288 mm) in Table 1215.2(1):
    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 1215.2(1) through Table 1215.2(36) shall be used to size gas piping in conjunction with one of the methods described in Section 1215.1.1 through Section 1215.1.3. [NFPA 54:6.2]

TABLE 1215.2(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 11 300 23 100 41 800 67 600 139 000 252 000 399 000
20 118 247 466 957 1430 2760 4400 7780 15 900 28 700 46 500 95 500 173 000 275 000
30 95 199 374 768 1150 2220 3530 6250 12 700 23 000 37 300 76 700 139 000 220 000
40 81 170 320 657 985 1900 3020 5350 10 900 19 700 31 900 65 600 119 000 189 000
50 72 151 284 583 873 1680 2680 4740 9660 17 500 28 300 58 200 106 000 167 000
60 65 137 257 528 791 1520 2430 4290 8760 15 800 25 600 52 700 95 700 152 000
70 60 126 237 486 728 1400 2230 3950 8050 14 600 23 600 48 500 88 100 139 000
80 56 117 220 452 677 1300 2080 3670 7490 13 600 22 000 45 100 81 900 130 000
90 52 110 207 424 635 1220 1950 3450 7030 12 700 20 600 42 300 76 900 122 000
100 50 104 195 400 600 1160 1840 3260 6640 12 000 19 500 40 000 72 600 115 000
125 44 92 173 355 532 1020 1630 2890 5890 10 600 17 200 35 400 64 300 102 000
150 40 83 157 322 482 928 1480 2610 5330 9650 15 600 32 100 58 300 92 300
175 37 77 144 296 443 854 1360 2410 4910 8880 14 400 29 500 53 600 84 900
200
34 71 134 275 412 794 1270 2240 4560 8260 13 400 27 500 49 900 79 000
250 30 63 119 244 366 704 1120 1980 4050 7320 11 900 24 300 44200 70 000
300 27 57 108 221 331 638 1020 1800 3670 6630 10 700 22 100 40 100 63 400
350 25 53 99 203 305 587 935 1650 3370 6100 9880 20 300 36 900 58 400
400 23 49 92 189 283 546 870 1540 3140 5680 9190 18 900 34 300 54 300
450 22 46 86 177 266 512 816 1440 2940 5330 8620 17 700 32 200 50 900
500 21 43 82 168 251 484 771 1360 2780 5030 8150 16 700 30 400 48 100
550 20 41 78 159 239 459 732 1290 2640 4780 7740 15 900 28 900 45 700
600 19 39 74 152 228 438 699 1240 2520 4560 7380 15 200 27 500 43 600
650 18 38 71 145 218 420 669 1180 2410 4360 7070 14 500 26 400 41 800
700 17 36 68 140 209 403 643 1140 2320 4190 6790 14 000 25 300 40 100
750 17 35 66 135 202 389 619 1090 2230 4040 6540 13 400 24400 38 600
800 16 34 63 130 195 375 598 1060 2160 3900 6320 13 000 23 600 37 300
850 16 33 61 126 189 363 579 1020 2090 3780 6110 12 600 22 800 36 100
900 15 32 59 122 183 352 561 992 2020 3660 5930 12 200 22 100 35 000
950 15 31 58 118 178 342 545 963 1960 3550 5760 11 800 21 500 34 000
1000 14 30 56 115 173 333 530 937 1910 3460 5600 11 500 20 900 33 100
1100 14 28 53 109 164 316 503 890 1810 3280 5320 10 900 19 800 31 400
1200 13 27 51 104 156 301 480 849 1730 3130 5070 10 400 18 900 30 000
1300 12 26 49 100 150 289 460 813 1660 3000 4860 9980 18 100 28 700
1400
12 25 47 96 144 277 442 781 1590 2880 4670 9590 17 400 27 600
1500
11 24 45 93 139 267 426 752 1530 2780 4500 9240 16 800 26 600
1600
11 23 44 89 134 258 411 727 1480 2680 4340 8920 16 200 25 600
1700
11 22 42 86 130 250 398 703 1430 2590 4200 8630 15 700 24 800
1800
10 22 41 84 126 242 386 682 1390 2520 4070 8370 15 200 24 100
1900
10 21 40 81 122 235 375 662 1350 2440 3960 8130 14 800 23 400
2000 NA 20 39 79 119 229 364 644 1310 2380 3850 7910 14 400 22 700
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 Table entries are rounded to 3 significant digits.
  • 2 NA means a flow of less than 10 ft3/h (0.283 m3/h).


TABLE 1215.2(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 10 600 16 900 29 800 60 800
20 312 652 1230 2520 3780 7280 11 600 20 500 41 800
30 250 524 986 2030 3030 5840 9310 16 500 33 600
40 214 448 844 1730 2600 5000 7970 14 100 28 700
50 190 397 748 1540 2300 4430 7060 12 500 25 500
60 172 360 678 1390 2090 4020 6400 11 300 23 100
70 158 331 624 1280 1920 3690 5890 10 400 21 200
80 147 308 580 1190 1790 3440 5480 9690 19 800
90 138 289 544 1120 1670 3230 5140 9090 18 500
100 131 273 514 1060 1580 3050 4860 8580 17 500
125 116 242 456 936 1400 2700 4300 7610 15 500
150 105 219 413 848 1270 2450 3900 6890 14 100
175 96 202 380 780 1170 2250 3590 6340 12 900
200 90 188 353 726 1090 2090 3340 5900 12 000
250 80 166 313 643 964 1860 2960 5230 10 700
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 1215.2(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 1.380 1.610 2.067 2.469 3.068 4.026
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10 660 1380 2600 5340 8000 15 400 24 600 43 400 88 500
20 454 949 1790 3670 5500 10 600 16 900 29 800 60 800
30 364 762 1440 2950 4410 8500 13 600 24 000 48 900
40 312 652 1230 2520 3780 7280 11 600 20 500 41 800
50 276 578 1090 2240 3350 6450 10 300 18 200 37 100
60 250 524 986 2030 3030 5840 9310 16 500 33 600
70 230 482 907 1860 2790 5380 8570 15 100 30 900
80 214 448 844 1730 2600 5000 7970 14 100 28 700
90 201 420 792 1630 2440 4690 7480 13 200 27 000
100 190 397 748 1540 2300 4430 7060 12 500 25 500
125 168 352 663 1360 2040 3930 6260 11 100 22 600
150 153 319 601 1230 1850 3560 5670 10 000 20 500
175 140 293 553 1140 1700 3270 5220 9230 18 800
200 131 273 514 1056 1580 3050 4860 8580 17 500
250 116 242 456 936 1400 2700 4300 7610 15 500
300 105 219 413 848 1270 2450 3900 6890 14 100
350 96 202 380 780 1170 2250 3590 6340 12 900
400 90 188 353 726 1090 2090 3340 5900 12 000
450 84 176 332 681 1020 1960 3130 5540 11 300
500 80 166 313 643 964 1860 2960 5230 10 700
550 76 158 297 611 915 1760 2810 4970 10 100
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 mm water column= 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1215.2(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 11 400 17 100 32 900 52 500 92 800 189 000
20 1070 2150 3930 8070 12 100 23 300 37 100 65 600 134 000
30 869 1760 3210 6590 9880 19 000 30 300 53 600 109 000
40 753 1520 2780 5710 8550 16 500 26 300 46 400 94 700
50 673 1360 2490 5110 7650 14 700 23 500 41 500 84 700
60 615 1240 2270 4660 6980 13 500 21400 37 900 77 300
70 569 1150 2100 4320 6470 12 500 19 900 35 100 71 600
80 532 1080 1970 4040 6050 11 700 18 600 32 800 67 000
90 502 1010 1850 3810 5700 11 000 17 500 30 900 63 100
100 462 934 1710 3510 5260 10 100 16 100 28 500 58 200
125 414 836 1530 3140 4700 9060 14 400 25 500 52 100
150 372 751 1370 2820 4220 8130 13 000 22 900 46 700
175 344 695 1270 2601 3910 7530 12 000 21 200 43 300
200 318 642 1170 2410 3610 6960 11 100 19 600 40 000
250 279 583 1040 2140 3210 6180 9850 17 400 35 500
300 253 528 945 1940 2910 5600 8920 15 800 32 200
350 232 486 869 1790 2670 5150 8210 14 500 29 600
400 216 452 809 1660 2490 4790 7640 13 500 27 500
450 203 424 759 1560 2330 4500 7170 12 700 25 800
500 192 401 717 1470 2210 4250 6770 12 000 24 400
550 182 381 681 1400 2090 4030 6430 11 400 23 200
600 174 363 650 1330 2000 3850 6130 10 800 22 100
650 166 348 622 1280 1910 3680 5870 10 400 21 200
700 160 334 598 1230 1840 3540 5640 9970 20 300
750 154 322 576 1180 1770 3410 5440 9610 19 600
800 149 311 556 1140 1710 3290 5250 9280 18 900
850 144 301 538 1100 1650 3190 5080 8980 18 300
900 139 292 522 1070 1600 3090 4930 8710 17 800
950 135 283 507 1040 1560 3000 4780 8460 17 200
1000 132 275 493 1010 1520 2920 4650 8220 16 800
1100 125 262 468 960 1440 2770 4420 7810 15 900
1200 119 250 446 917 1370 2640 4220 7450 15 200
1300 114 239 427 878 1320 2530 4040 7140 14 600
1400 110 230 411 843 1260 2430 3880 6860 14 000
1500 106 221 396 812 1220 2340 3740 6600 13 500
1600 102 214 382 784 1180 2260 3610 6380 13 000
1700 99 207 370 759 1140 2190 3490 6170 12 600
1800 96 200 358 736 1100 2120 3390 5980 12 200
1900 93 195 348 715 1070 2060 3290 5810 11 900
2000 91 189 339 695 1040 2010 3200 5650 11 500
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 1215.2(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 19 000 28 500 54 900 87 500 155 000 316 000
20 1620 3380 6370 13 100 19 600 37 700 60 100 106 000 217 000
30 1300 2720 5110 10 500 15 700 30 300 48 300 85 400 174 000
40 1110 2320 4380 8990 13 500 25 900 41 300 73 100 149 000
50 985 2060 3880 7970 11 900 23 000 36 600 64 800 132 000
60 892 1870 3520 7220 10 800 20 800 33 200 58 700 120 000
70 821 1720 3230 6640 9950 19 200 30 500 54 000 110 000
80 764 1600 3010 6180 9260 17 800 28 400 50 200 102 000
90 717 1500 2820 5800 8680 16 700 26 700 47 100 96 100
100 677 1420 2670 5470 8200 15 800 25 200 44 500 90 800
125 600 1250 2360 4850 7270 14 000 22 300 39 500 80 500
150 544 1140 2140 4400 6590 12 700 20 200 35 700 72 900
175 500 1050 1970 4040 6060 11 700 18 600 32 900 67 100
200 465 973 1830 3760 5640 10 900 17 300 30 600 62 400
250 412 862 1620 3330 5000 9620 15 300 27 100 55 300
300 374 781 1470 3020 4530 8720 13 900 24 600 50 100
350 344 719 1350 2780 4170 8020 12 800 22 600 46 100
400 320 669 1260 2590 3870 7460 11 900 21 000 42 900
450 300 627 1180 2430 3640 7000 11 200 19 700 40 200
500 283 593 1120 2290 3430 6610 10 500 18 600 38 000
550 269 563 1060 2180 3260 6280 10 000 17 700 36 100
600 257 537 1010 2080 3110 5990 9550 16 900 34 400
650 246 514 969 1990 2980 5740 9150 16 200 33 000
700 236 494 931 1910 2860 5510 8790 15 500 31 700
750 228 476 897 1840 2760 5310 8470 15 000 30 500
800 220 460 866 1780 2660 5130 8180 14 500 29 500
850 213 445 838 1720 2580 4960 7910 14 000 28 500
900 206 431 812 1670 2500 4810 7670 13 600 27 700
950 200 419 789 1620 2430 4670 7450 13 200 26 900
1000 195 407 767 1580 2360 4550 7240 12 800 26 100
1100 185 387 729 1500 2240 4320 6890 12 200 24 800
1200 177 369 695 1430 2140 4120 6570 11 600 23 700
1300 169 353 666 1370 2050 3940 6290 11 100 22 700
1400 162 340 640 1310 1970 3790 6040 10 700 21 800
1500 156 327 616 1270 1900 3650 5820 10 300 21 000
1600 151 316 595 1220 1830 3530 5620 10 000 20 300
1700 146 306 576 1180 1770 3410 5440 9610 19 600
1800 142 296 558 1150 1720 3310 5270 9320 19 000
1900 138 288 542 1110 1670 3210 5120 9050 18 400
2000 134 280 527 1080 1620 3120 4980 8800 18 000
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 1215.2(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 11 800 24 200 36 200 69 700 111 000 196 000 401 000
20 2250 4550 8320 17 100 25 600 49 300 78 600 139 000 283 000
30 1840 3720 6790 14 000 20 900 40 300 64 200 113 000 231 000
40 1590 3220 5880 12 100 18 100 34 900 55 600 98 200 200 000
50 1430 2880 5260 10 800 16 200 31 200 49 700 87 900 179 000
60 1300 2630 4800 9860 14 800 28 500 45 400 80 200 164 000
70 1200 2430 4450 9130 13 700 26 400 42 000 74 300 151 000
80 1150 2330 4260 8540 12 800 24 700 39 300 69 500 142 000
90 1060 2150 3920 8050 12 100 23 200 37 000 65 500 134 000
100 979 1980 3620 7430 11 100 21 400 34 200 60 400 123 000
125 876 1770 3240 6640 9950 19 200 30 600 54 000 110 000
150 786 1590 2910 5960 8940 17 200 27 400 48 500 98 900
175 728 1470 2690 5520 8270 15 900 25 400 44 900 91 600
200 673 1360 2490 5100 7650 14 700 23 500 41 500 84 700
250
558 1170 2200 4510 6760 13 000 20 800 36 700 74 900
300 506 1060 1990 4090 6130 11 800 18 800 33 300 67 800
350 465 973 1830 3760 5640 10 900 17 300 30 600 62 400
400 433 905 1710 3500 5250 10 100 16 100 28 500 58 100
450 406 849 1600 3290 4920 9480 15 100 26 700 54 500
500 384 802 1510 3100 4650 8950 14 300 25 200 51 500
550 364 762 1440 2950 4420 8500 13 600 24 000 48 900
600 348 727 1370 2810 4210 8110 12 900 22 900 46 600
650 333 696 1310 2690 4030 7770 12 400 21 900 44 600
700 320 669 1260 2590 3880 7460 11 900 21 000 42 900
750 308 644 1210 2490 3730 7190 11 500 20 300 41 300
800 298 622 1170 2410 3610 6940 11 100 19 600 39 900
850 288 602 1130 2330 3490 6720 10 700 18 900 38 600
900 279 584 1100 2260 3380 6520 10 400 18 400 37 400
950 271 567 1070 2190 3290 6330 10 100 17 800 36 400
1000 264
551 1040 2130 3200 6150 9810 17 300 35 400
1100 250 524 987 2030 3030 5840 9320 16 500 33 600
1200 239 500 941 1930 2900 5580 8890 15 700 32 000
1300 229 478 901 1850 2770 5340 8510 15 000 30 700
1400 220 460 866 1780 2660 5130 8180 14 500 29 500
1500 212 443 834 1710 2570 4940 7880 13 900 28 400
1600 205 428 806 1650 2480 4770 7610 13400 27 400
1700 198 414 780 1600 2400 4620 7360 13 000 26 500
1800 192 401 756 1550 2330 4480 7140 12 600 25 700
1900 186 390 734 1510 2260 4350 6930 12 300 25 000
2000 181 379 714 1470 2200 4230 6740 11 900 24 300
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 1215.2(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 Table entries are rounded to 3 significant digits.
  • 2 NA means a flow of less than 10 ft3/h (0.283 m3/h).
  • 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 1215.2(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 Table entries are rounded to 3 significant digits.
  • 2 NA means a flow of less than 10 ft3/h (0.283 m3/h).
  • 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 1215.2(9)
SEMI-RIGID COPPER TUBING [NFPA 54:TABLE 6.20)] 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 Table entries are rounded to 3 significant digits.
  • 2 NA means a flow of less than 10 ft3/h (0.283 m3/h).
  • 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 1215.2(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 12 000
24 900
20 130 269 547 956 1360 2900 5220 8230 17 100
30 105
216 439 768 1090 2330 4190 6610 13 800
40 90 185 376 657 932 1990 3590 5650 11 800
50 79 164 333 582 826 1770 3180 5010 10 400
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 77 135 191 408 734 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 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Table entries are rounded to 3 significant digits.


TABLE 1215.2(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 15 500 32 200
20 169 348 708 1240 1760 3750 6750 10 600 22 200
30 135 279 568 993 1410 3010 5420 8550 17 800
40 116 239 486 850 1210 2580 4640 7310 15 200
50 103 212 431 754 1070 2280 4110 6480 13 500
60 93 192 391 683 969 2070 3730 5870 12 200
70 86 177 359 628 891 1900 3430 5400 11 300
80 80 164 334 584 829 1770 3190 5030 10 500
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 3520
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 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Table entries are rounded to 3 significant digits.


TABLE 1215.2(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 HOUR.2
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
103036251270222031506740121 0019 10039 800
20208430874153021704630833013 10027 400
30167345702123017403720669010 60022 000
401432956011050149031805730903018 800
50127262532931132028205080800016 700
60115237482843120025604600725015 100
70106218444776110023504230667013 900
8098203413722102021903940621012 900
909219038767796120503690582012 100
1008718036664090719403490550011 500
1257715932456780417203090488010 200
150701442945147291560280044209200
175641332704726701430258040608460
200601242524406241330240037807870
250531102233905531180213033506980
30048992023535011070193030406320
3504491186325461984177027905820
4004185173302429916165026005410
4503980162283402859155024405080
5003675153268380811146023004800
5503572146254361771139021904560
6003368139243344735132020904350
6503265133232330704127020004160
7003063128223317676122019204000
7502960123215305652117018503850
8002858119208295629113017903720
8502757115201285609110017303600
9002755111195276590106016803490
9502653108189268573103016303390
10002552105184261558100015803300
1100244910017524853095415003130
120023479516723750591014302990
130022459116022748487113702860
140021438815321846583713202750
150020428514821044880612702650
160019408214320243277912302560
170019397913819641975311902470
180018387713419040673111502400
190018377413018439470911202330
200017367212617938369010902270
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 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Where this table is used to size the tubing upstream of a line pressure regulator , the pipe or tubing downstream of the line pressure regulator shall be sized using a pressure drop no greater than 1 inch water column (0.249 kPa).
  • 3 Table entries are rounded to 3 significant digits.


TABLE 1215.2(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
10511105021403750532011 40020 40032 20067 100
20351724147025803650780014 00022 20046 100
30282582118020702930627011 30017 80037 000
402414981010177025105360966015 20031 700
50214441898157022304750856013 50028 100
60194400813142020204310775012 20025 500
70178368748131018603960713011 20023 400
80166342696122017303690664010 50021 800
901563216531140162034606230982020 400
1001473036171080153032705880927019 300
125130269547955136029005210822017 100
150118243495866123026204720745015 500
175109224456796113024104350685014 300
200101208424741105022504040637013 300
2509018537665793219903580565011 800
3008116734059584418003250512010 700
350751543135477771660299047109810
400691432915097221540278043809120
450651342734786781450261041108560
500621272584516401370246038808090
550581212454296081300234036907680
600561152344095801240223035207330
650531102243925561190214033707020
700511062153765341140205032406740
750491022073625141100198031206490
80048982003504971060191030106270
85046951943394811030185029106070
90045921883284661000179028205880
9504390182319452967174027405710
10004287177310440940169026705560
11004083169295418893161025305280
12003879161281399852153024205040
13003776154269382816147023204820
14003573148259367784141022204630
15003470143249353755136021404460
16003368138241341729131020704310
17003265133233330705127020004170
18003163129226320684123019404040
19003062125219311664120018903930
20002960122213302646116018303820
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 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Table entries are rounded to 3 significant digits.


TABLE 1215.2(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 : 1315181923253031373946486062
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
5466311513422527047154689510371790207036604140
10324482951611923303836397461260147026002930
15253566771321572673105246151030120021402400
2022315867116137231269456536888105018502080
251927526010412220624040948279393616601860
30182547559611218821837444272385615201700
4015214147839716218832538662574213201470
5013193742758714416829234755966511801320
6012173438688013115326731850960810801200
7011163136637412114124829547156310001110
801015293360691131322322774405279401040
90101428325765107125219262415498887983
10091326305462101118208249393472843933
150710202342487891171205320387691762
20069182138447182148179277336600661
25058161934396374133161247301538591
3005715173236576795148226275492540
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 Table entries are rounded to 3 significant digits.
  • 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 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 1215.2(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 : 13151819232530313746486062
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
512016027732752964911801370214044305010880010 100
108311219723138046282895815303200356062707160
15679016118931337967377812502540291051405850
20577814016427332958067210902200253044605070
2551691251472452955185999781960227040004540
3046631151342252704715468951790207036604140
4039541001161962344074717781550180031803590
503548891041762103634216981380161028503210
60324482951611923303836391260147026002930
70294176881501783063555931170136024202720
80273871821411672853315551090128022602540
90263667771331572683115241030120021402400
10024346373126149254295498974114020302280
1501927526010412220624040979393616601860
200172345529110617820735568681214401610
25015214046829515918431961372812901440
30013193742758714416823455966511801320
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 Table entries are rounded to 3 significant digits.
  • 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 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 1215.2(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 : 13151819232530313746486062
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
51732293894617379111690195030006280705012 40014 260
1012016027732752964911801370214044305010880010 100
1596130227267436532960111017603610410072108260
208311219723138046282895815303120356062707160
25749917620734241473985513702790319056206400
30679016118931337967377812502540291051405850
40577814016427332958067210902200253044605070
5051691251472452955185999781960227040004540
6046631151342252704715468951790207036604140
7042581061242092504355058301660192033903840
8039541001161962344074717781550180031803590
903751941091852213834447351460170030003390
1003548891041762103634216981380161028503210
150283973851451722943425731130132023402630
20024346373126149254295498974114020302280
25021305766114134226263447870102018202040
3001927526010412220624040979393616601860
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 Table entries are rounded to 3 significant digits.
  • 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 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 1215.2(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 : 1315181923253031373946486062
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
10270353587700110013702590299045105037960010 70018 60021 600
2516622037444470987616201870289032586040678011 90013 700
3015120034240565080114801700264029875510620010 90012 500
40129172297351567696127014702300260547605380944010 900
5011515426631451062411401310206023434260482084709720
75931242182574205129221070169019323470395069407940
80891202112494074968921030164018743360382067307690
10079107189222366445795920147016853000342060306880
1506487155182302364646748121013892440280049405620
2005575135157263317557645105012122110243042904870
250496712114123628449757694110901890218038504360
30044611101292172604535258629991720199035203980
4003852961111892253904537498711490173030603450
5003446861001702023484045527831330155027403090
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 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 CAUTION: Capacities shown in table are capable of exceeding maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.
  • 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 Table entries are rounded to 3 significant digits.
  • 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 1215.2(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 : 1315181923253031373946486062
LENGTH (feet) CAPACITY IN CUBIC FEET OF GAS PER HOUR
105236741080130020002530492056608300914018 10019 80034 40040 400
2532242069182712901620308035405310591111 40012 60022 00025 600
3029238263275511801480280032304860542010 40011 50020 10023 400
40251329549654103012802420279042304727897010 00017 40020 200
50223293492586926115021602490379042518020893015 60018 100
7518023840347976394417502020311035066530732012 80014 800
8017423039146374091516901960302034006320709012 40014 300
10015420535041566582015101740271030575650635011 10012 800
150124166287339548672123014202220252146005200913010 500
20010714324929447858410601220193021993980451079309090
250951282232634305249451090173019773550404071108140
30086116204240394479860995159018133240369065007430
40074100177208343416742858138015812800321056506440
5006689159186309373662766104014222500287050605760
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 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 a regulator are capable of varying with flow rate.
  • 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 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 Table entries are rounded to 3 significant digits.
  • 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 1215.2(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 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
1015330555195514402590717013 900
20105210379656991178049209520
3084169304527796143039507640
4072144260451681122033806540
5064128231400604108030005800
605811620936254798327205250
705310719233350390425004830
80509917931046884123304500
90469316829143978921804220
100448815927541574520603990
125397814124336866118303530
150357112722133359816603200
175326511720330655115202940
200306010918928551214202740
25027549716725345412602430
30024488815222941111402200
35022458113921137810502020
4002142751301963529741880
4501939701221843309141770
5001837661151743128631670
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 1215.2(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
10201403726126019003410945018 260
2013827749986513102350649012 550
3011122240169510501880521010 080
4095190343594898161044608630
5084169304527796143039507640
6076153276477721130035806930
7070140254439663119033006370
8065131236409617111030705930
9061123221383579104028805560
1005811620936254798327205250
1255110318532148587124104660
150469316829143978921804220
175438615426840472620103880
200408014424937667518703610
250357112722133359816603200
300326411520030254215002900
350295910618427849913802670
40027559917125846412802480
45026519316024243512002330
50024488815222941111402200
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 1215.2(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 11 600 17 600 31 600 87 300 169 000
20 1280 2560 4610 7990 12 100 21 700 60 000 116 000
30 1030 2050 3710 6420 9690 17 400 48 200 93 200
40 878 1760 3170 5490 8300 14 900 41 200 79 700
50 778 1560 2810 4870 7350 13 200 36 600 70 700
60 705 1410 2550 4410 6660 12 000 33 100 64 000
70 649 1300 2340 4060 6130 11 000 30 500 58 900
80 603 1210 2180 3780 5700 10 200 28 300 54 800
90 566 1130 2050 3540 5350 9610 26 600 51 400
100 535 1070 1930 3350 5050 9080 25 100 48 600
125 474 949 1710 2970 4480 8050 22 300 43 000
150 429 860 1550 2690 4060 7290 20 200 39 000
175 395 791 1430 2470 3730 6710 18 600 35 900
200 368 736 1330 2300 3470 6240 17 300 33 400
250 326 652 1180 2040 3080 5530 15 300 29 600
300 295 591 1070 1850 2790 5010 13 900 26 800
350 272 544 981 1700 2570 4610 12 800 24 700
400 253 506 913 1580 2390 4290 11 900 22 900
450 237 475 856 1480 2240 4020 11 100 21 500
500 224 448 809 1400 2120 3800 10 500 20 300
550 213 426 768 1330 2010 3610 9990 19 300
600 203 406 733 1270 1920 3440 9530 18 400
650 194 389 702 1220 1840 3300 9130 17 600
700 187 374 674 1170 1760 3170 8770 16 900
750 180 360 649 1130 1700 3050 8450 16 300
800 174 348 627 1090 1640 2950 8160 15 800
850 168 336 607 1050 1590 2850 7890 15 300
900 163 326 588 1020 1540 2770 7650 14 800
950 158 317 572 990 1500 2690 7430 14 400
1000 154 308 556 963 1450 2610 7230 14 000
1100 146 293 528 915 1380 2480 6870 13 300
1200 139 279 504 873 1320 2370 6550 12 700
1300 134 267 482 836 1260 2270 6270 12 100
1400 128 257 463 803 1210 2180 6030 11 600
1500 124 247 446 773 1170 2100 5810 11 200
1600 119 239 431 747 1130 2030 5610 10 800
1700 115 231 417 723 1090 1960 5430 10 500
1800 112 224 404 701 1060 1900 5260 10 200
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 1215.2(22)
POLYETHYLENE PLASTIC TUBING [NFPA 54:TABLE 6.2(w)]2, 3
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 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 = 0.0283m3/h, 1 pound-force per square inch= 6.8947 kPa, 1 inch water column =0.249 kPa
Notes:
  • 1 CTS = Copper tube size.
  • 2 Table entries are rounded to 3 significant digits.
  • 3 NA means a flow of less than 10 ft3/h (0.283 m3/h).


TABLE 1215.2(23)
POLYETHYLENE PLASTIC TUBING [NFPA 54: TABLE 6.2(x)]2, 3
GAS: NATURAL
INLET PRESSURE: LESS THAN 2 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 = 0.0283m3/h, 1 pound-force per square inch= 6.8947 kPa, 1 inch water column =0.249 kPa
Notes:
  • 1 CTS = Copper tube size.
  • 2 Table entries are rounded to 3 significant digits.
  • 3 NA means a flow of less than 10 ft3/h (0.283 m3/h).


TABLE 1215.2(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 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 3320 6950 13 100 26 900 40 300 77 600 124 000 219 000 446 000
20 2280 4780 9000 18 500 27 700 53 300 85 000 150 000 306 000
30 1830 3840 7220 14 800 22 200 42 800 68 200 121 000 246 000
40 1570 3280 6180 12 700 19 000 36 600 58 400 103 000 211 000
50 1390 2910 5480 11 300 16 900 32 500 51 700 91 500 187 000
60 1260 2640 4970 10 200 15 300 29 400 46 900 82 900 169 000
70 1160 2430 4570 9380 14 100 27 100 43 100 76 300 156 000
80 1080 2260 4250 8730 13 100 25 200 40 100 70 900 145 000
90 1010 2120 3990 8190 12 300 23 600 37 700 66 600 136 000
100 956 2000 3770 7730 11 600 22 300 35 600 62 900 128 000
125 848 1770 3340 6850 10 300 19 800 31 500 55 700 114 000
150 768 1610 3020 6210 9300 17 900 28 600 50 500 103 000
175 706 1480 2780 5710 8560 16 500 26 300 46 500 94 700
200 657 1370 2590 5320 7960 15 300 24 400 43 200 88 100
250 582 1220 2290 4710 7060 13 600 21 700 38 300 78 100
300 528 1100 2080 4270 6400 12 300 19 600 34 700 70 800
350 486 1020 1910 3930 5880 11 300 18 100 31 900 65 100
400 452 945 1780 3650 5470 10 500 16 800 29 700 60 600
450 424 886 1670 3430 5140 9890 15 800 27 900 56 800
500 400 837 1580 3240 4850 9340 14 900 26 300 53 700
550 380 795 1500 3070 4610 8870 14 100 25 000 51 000
600 363 759 1430 2930 4400 8460 13 500 23 900 48 600
650 347 726 1370 2810 4210 8110 12 900 22 800 46 600
700 334 698 1310 2700 4040 7790 12 400 21 900 44 800
750 321 672 1270 2600 3900 7500 12 000 21 100 43 100
800 310 649 1220 2510 3760 7240 11 500 20 400 41 600
850 300 628 1180 2430 3640 7010 11 200 19 800 40 300
900 291 609 1150 2360 3530 6800 10 800 19 200 39 100
950 283 592 1110 2290 3430 6600 10 500 18 600 37 900
1000 275 575 1080 2230 3330 6420 10 200 18 100 36 900
1100 261 546 1030 2110 3170 6100 9720 17 200 35 000
1200 249 521 982 2020 3020 5820 9270 16 400 33 400
1300 239 499 940 1930 2890 5570 8880 15 700 32 000
1400 229 480 903 1850 2780 5350 8530 15 100 30 800
1500 221 462 870 1790 2680 5160 8220 14 500 29 600
1600 213 446 840 1730 2590 4980 7940 14 000 28 600
1700 206 432 813 1670 2500 4820 7680 13 600 27 700
1800 200 419 789 1620 2430 4670 7450 13 200 26 900
1900 194 407 766 1570 2360 4540 7230 12 800 26 100
2000 189 395 745 1530 2290 4410 7030 12 400 25 400
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 1215.2(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 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 5890 12 300 23 200 47 600 71 300 137 000 219 000 387 000 789 000
20 4050 8460 15 900 32 700 49 000 94 400 150 000 266 000 543 000
30 3250 6790 12 800 26 300 39 400 75 800 121 000 214 000 436 000
40 2780 5810 11 000 22 500 33 700 64 900 103 000 183 000 373 000
50 2460 5150 9710 19 900 29 900 57 500 91 600 162 000 330 000
60 2230 4670 8790 18 100 27 100 52 100 83 000 147 000 299 000
70 2050 4300 8090 16 600 24 900 47 900 76 400 135 000 275 000
80 1910 4000 7530 15 500 23 200 44 600 71 100 126 000 256 000
90 1790 3750 7060 14 500 21 700 41 800 66 700 118 000 240 000
100 1690 3540 6670 13 700 20 500 39 500 63 000 111 000 227 000
125 1500 3140 5910 12 100 18 200 35 000 55 800 98 700 201 000
150 1360 2840 5360 11 000 16 500 31 700 50 600 89 400 182 000
175 1250 2620 4930 10 100 15 200 29 200 46 500 82 300 167 800
200 1160 2430 4580 9410 14 100 27 200 43 300 76 500 156 100
250 1030 2160 4060 8340 12 500 24 100 38 400 67 800 138 400
300 935 1950 3680 7560 11 300 21 800 34 800 61 500 125 400
350 860 1800 3390 6950 10 400 20 100 32 000 56 500 115 300
400 800 1670 3150 6470 9690 18 700 29 800 52 600 107 300
450 751 1570 2960 6070 9090 17 500 27 900 49 400 100 700
500 709 1480 2790 5730 8590 16 500 26 400 46 600 95 100
550 673 1410 2650 5450 8160 15 700 25 000 44 300 90 300
600 642 1340 2530 5200 7780 15 000 23 900 42 200 86 200
650 615 1290 2420 4980 7450 14 400 22 900 40 500 82 500
700 591 1240 2330 4780 7160 13 800 22 000 38 900 79 300
750 569 1190 2240 4600 6900 13 300 21 200 37 400 76 400
800 550 1150 2170 4450 6660 12 800 20 500 36 200 73 700
850 532 1110 2100 4300 6450 12 400 19 800 35 000 71 400
900 516 1080 2030 4170 6250 12 000 19 200 33 900 69 200
950 501 1050 1970 4050 6070 11 700 18 600 32 900 67 200
1000 487 1020 1920 3940 5900 11 400 18 100 32 000 65 400
1100 463 968 1820 3740 5610 10 800 17 200 30 400 62 100
1200 442 923 1740 3570 5350 10 300 16 400 29 000 59 200
1300 423 884 1670 3420 5120 9870 15 700 27 800 56 700
1400 406 849 1600 3280 4920 9480 15 100 26 700 54 500
1500 391 818 1540 3160 4740 9130 14 600 25 700 52 500
1600 378 790 1490 3060 4580 8820 14 100 24 800 50 700
1700 366 765 1440 2960 4430 8530 13 600 24 000 49 000
1800 355 741 1400 2870 4300 8270 13 200 23 300 47 600
1900 344 720 1360 2780 4170 8040 12 800 22 600 46 200
2000 335 700 1320 2710 4060 7820 12 500 22 000 44 900
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 1215.2(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
INSIDE:
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 10 500 21 600 32 400 62 400 99 500 176 000 359 000
20 1840 3850 7240 14 900 22 300 42 900 68 400 121 000 247 000
30 1480 3090 5820 11 900 17 900 34 500 54 900 97 100 198 000
40 1260 2640 4980 10 200 15 300 29 500 47 000 83 100 170 000
50 1120 2340 4410 9060 13 600 26 100 41 700 73 700 150 000
60 1010 2120 4000 8210 12 300 23 700 37 700 66 700 136 000
70 934 1950 3680 7550 11 300 21 800 34 700 61 400 125 000
80 869 1820 3420 7020 10 500 20 300 32 300 57 100 116 000
90 815 1700 3210 6590 9880 19 000 30 300 53 600 109 000
100 770 1610 3030 6230 9330 18 000 28 600 50 600 103 000
125 682 1430 2690 5520 8270 15 900 25 400 44 900 91 500
150 618 1290 2440 5000 7490 14 400 23 000 40 700 82 900
175 569 1190 2240 4600 6890 13 300 21 200 37 400 76 300
200 529 1110 2080 4280 6410 12 300 19 700 34 800 71 000
250 469 981 1850 3790 5680 10 900 17 400 30 800 62 900
300 425 889 1670 3440 5150 9920 15 800 27 900 57 000
350 391 817 1540 3160 4740 9120 14 500 25 700 52 400
400 364 760 1430 2940 4410 8490 13 500 23 900 48 800
450 341 714 1340 2760 4130 7960 12 700 22 400 45 800
500 322 674 1270 2610 3910 7520 12 000 21 200 43 200
550 306 640 1210 2480 3710 7140 11 400 20 100 41 100
600 292 611 1150 2360 3540 6820 10 900 19 200 39 200
650 280 585 1100 2260 3390 6530 10 400 18 400 37 500
700 269 562 1060 2170 3260 6270 9990 17 700 36 000
750 259 541 1020 2090 3140 6040 9630 17 000 34 700
800 250 523 985 2020 3030 5830 9300 16 400 33 500
850 242 506 953 1960 2930 5640 9000 15 900 32 400
900 235 490 924 1900 2840 5470 8720 15 400 31 500
950 228 476 897 1840 2760 5310 8470 15 000 30 500
1000 222 463 873 1790 2680 5170 8240 14 600 29 700
1100 210 440 829 1700 2550 4910 7830 13 800 28 200
1200 201 420 791 1620 2430 4680 7470 13 200 26 900
1300 192 402 757 1550 2330 4490 7150 12 600 25 800
1400 185 386 727 1490 2240 4310 6870 12 100 24 800
1500 178 372 701 1440 2160 4150 6620 11 700 23 900
1600 172 359 677 1390 2080 4010 6390 11 300 23 000
1700 166 348 655 1340 2010 3880 6180 10 900 22 300
1800 161 337 635 1300 1950 3760 6000 10 600 21 600
1900 157 327 617 1270 1900 3650 5820 10 300 21 000
2000 152 318 600 1230 1840 3550 5660 10 000 20 400
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 1215.2(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 ANO APPLIANCE
PIPE SIZE (inch)
NOMINAL
INSIDE:
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
10 291 608 1150 2350 3520 6790 10 800 19 100 39 000
20 200 418 787 1620 2420 4660 7430 13 100 26 800
30 160 336 632 1300 1940 3750 5970 10 600 21 500
40 137 287 541 1110 1660 3210 5110 9030 18 400
50 122 255 480 985 1480 2840 4530 8000 16 300
60 110 231 434 892 1340 2570 4100 7250 14 800
80 101 212 400 821 1230 2370 3770 6670 13 600
100 94 197 372 763 1140 2200 3510 6210 12 700
125 89 185 349 716 1070 2070 3290 5820 11 900
150 84 175 330 677 1010 1950 3110 5500 11 200
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 1215.2(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 11 400 20 500 32 300 67 400
20 352 727 1480 2580 3670 7830 14 100 22 200 46 300
30 283 584 1190 2080 2940 6290 11 300 17 900 37 200
40 242 500 1020 1780 2520 5380 9690 15 300 31 800
50 215 443 901 1570 2230 4770 8590 13 500 28 200
60 194 401 816 1430 2020 4320 7780 12 300 25 600
70 179 369 751 1310 1860 3980 7160 11 300 23 500
80 166 343 699 1220 1730 3700 6660 10 500 21 900
90 156 322 655 1150 1630 3470 6250 9850 20 500
100 147 304 619 1080 1540 3280 5900 9310 19 400
125 131 270 549 959 1360 2910 5230 8250 17 200
150 118 244 497 869 1230 2630 4740 7470 15 600
175 109 225 457 799 1130 2420 4360 6880 14 300
200 101 209 426 744 1060 2250 4060 6400 13 300
250 90 185 377 659 935 2000 3600 5670 11 800
300 81 168 342 597 847 1810 3260 5140 10 700
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 20603250 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 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Table entries are rounded to 3 significant digits.


TABLE 1215.2(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, I inch water column= 0.249 kPa

Notes:

  • 1 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Table entries are rounded to 3 significant digits.
  • 3 NA means a flow of less than 10 000 Btu/h (2.93 kW).


TABLE 1215.2(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 16 500 26 000 54 200
20 284 585 1190 2080 2950 6310 11 400 17 900 37 300
30 228 470 956 1670 2370 5060 9120 14 400 29 900
40 195 402 818 1430 2030 4330 7800 12 300 25 600
50 173 356 725 1270 1800 3840 6920 10 900 22 700
60 157 323 657 1150 1630 3480 6270 9880 20 600
70 144 297 605 1060 1500 3200 5760 9090 18 900
80 134 276 562 983 1390 2980 5360 8450 17 600
90 126 259 528 922 1310 2790 5030 7930 16 500
100 119 245 498 871 1240 2640 4750 7490 15 600
125 105 217 442 772 1100 2340 4210 6640 13 800
150 95 197 400 700 992 2120 3820 6020 12 500
175 88 181 368 644 913 1950 3510 5540 11 500
200 82 168 343 599 849 1810 3270 5150 10 700
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 Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  • 2 Table entries are rounded to 3 significant digits.


TABLE 1215.2(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 : 1315181923253031373946486062
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 Table includes losses for four 90 degree (1.57 rad) bends and two end fitting s. Tubing runs with larger numbers of bends, fittings, or both shall be increased by an equivalent length of tubing to the followin g equation : L = 1.3 n, where Lis additional length (ft) of tubing and n is the number of additional fittings, bends, or both.
  • 2 Table entries are rounded to 3 significant digits.
  • 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 1215.2(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 : 1315181923253031373946486062
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 426 558 927 1110 1740 2170 4100 4720 7130 7958 15 200 16 800 29 400 34 200
25 262 347 591 701 1120 1380 2560 2950 4560 5147 9550 10 700 18 800 21 700
30 238 316 540 640 1030 1270 2330 2690 4180 4719 8710 9790 17 200 19 800
40 203 271 469 554 896 1100 2010 2320 3630 4116 7530 8500 14 900 17 200
50 181 243 420 496 806 986 1790 2070 3260 3702 6730 7610 13 400 15 400
75 147 196 344 406 663 809 1460 1690 2680 3053 5480 6230 11 000 12 600
80 140 189 333 393 643 768 1410 1630 2590 2961 5300 6040 10 600 12 200
100 124 169 298 350 578 703 1260 1450 2330 2662 4740 5410 9530 10 900
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 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 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 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 Lis additional length (ft) of tubing and n is the number of additional fittings, bends, or both
  • 4 Table entries are rounded to 3 significant digits.
  • 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 1215.2(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 : 1315181923253031373946486062
LENGTH (feet) CAPACITY IN THOUSANDS OF BTU PER HOUR
10 826 1070 1710 2060 3150 4000 7830 8950 13 100 14 441 28 600 31 200 54 400 63 800
25 509 664 1090 1310 2040 2550 4860 5600 8400 9339 18 000 19 900 34 700 40 400
30 461 603 999 1190 1870 2340 4430 5100 7680 8564 16 400 18 200 31 700 36 900
40 396 520 867 1030 1630 2030 3820 4400 6680 7469 14 200 15 800 27 600 32 000
50 352 463 777 926 1460 1820 3410 3930 5990 6717 12 700 14 100 24 700 28 600
75 284 376 637 757 1210 1490 2770 3190 4920 5539 10 300 11 600 20 300 23 400
80 275 363 618 731 1170 1450 2680 3090 4770 5372 9990 11 200 19 600 22 700
100 243 324 553 656 1050 1300 2390 2760 4280 4830 8930 1 0000 17 600 20 300
150 196 262 453 535 866 1060 1940 2240 3510 3983 7270 8210 14 400 16 600
200 169 226 393 464 755 923 1680 1930 3050 3474 6290 7130 12 500 14 400
250 150 202 352 415 679 828 1490 1730 2740 3124 5620 6390 11 200 12 900
300 136 183 322 379 622 757 1360 1570 2510 2865 5120 5840 10 300 11 700
400 117 158 279 328 542 657 1170 1360 2180 2498 4430 5070 8920 10 200
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 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 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 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 Lis additional length (ft) of tubing and n is the number of additional fittings, bends, or both
  • 4 Table entries are rounded to 3 significant digits.
  • 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 1215.2(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 CUBIC FEET OF GAS PER HOUR
10 340 680 1230 2130 3210 5770 16 000 30 900
20 233 468 844 1460 2210 3970 11 000 21 200
30 187 375 677 1170 1770 3180 8810 17 000
40 160 321 580 1000 1520 2730 7540 14 600
50 142 285 514 890 1340 2420 6680 12 900
60 129 258 466 807 1220 2190 6050 11 700
70 119 237 428 742 1120 2010 5570 10 800
80 110 221 398 690 1040 1870 5180 10 000
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, 1 000 British thermal units per hour= 0.293 kW, 1 inch water column= 0.249 kPa
* Table entries are rounded to 3 significant digits.


TABLE 1215.2(35)
POLYETHYLENE PLASTIC PIPE [NFPA 54:TABLE 6.3(1)] *
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 CUBIC FEET OF GAS PER HOUR
10 3130 6260 11 300 19 600 29 500 53 100 147 000 284 000
20 2150 4300 7760 13 400 20 300 36 500 101 000 195 000
30 1730 3450 6230 10 800 16 300 29 300 81 100 157 000
40 1480 2960 5330 9240 14 000 25 100 69 400 134 100
50 1310 2620 4730 8190 12 400 22 200 61 500 119 000
60 1190 2370 4280 7420 11 200 20 100 55 700 108 000
70 1090 2180 3940 6830 10 300 18 500 51 300 99 100
80 1010 2030 3670 6350 9590 17 200 47 700 92 200
90 952 1910 3440 5960 9000 16 200 44 700 86 500
100 899 1800 3250 5630 8500 15 300 42 300 81 700
125 797 1600 2880 4990 7530 13 500 37 500 72 400
150 722 1450 2610 4520 6830 12 300 33 900 65 600
175 664 1330 2400 4160 6280 11 300 31 200 60 300
200 618 1240 2230 3870 5840 10 500 29 000 56 100
250 548 1100 1980 3430 5180 9300 25 700 49 800
300 496 994 1790 3110 4690 8430 23 300 45 100
350 457 914 1650 2860 4320 7760 21 500 41 500
400 425 851 1530 2660 4020 7220 12 000 38 600
450 399 798 1440 2500 3770 6770 18 700 36 200
500 377 754 1360 2360 3560 6390 17 700 34 200
550 358 716 1290 2240 3380 6070 16 800 32 500
600 341 683 1230 2140 3220 5790 16 000 31 000
650 327 654 1180 2040 3090 5550 15 400 29 700
700 314 628 1130 1960 2970 5330 14 700 28 500
750 302 605 1090 1890 2860 5140 14 200 27 500
800 292 585 1050 1830 2760 4960 13 700 26 500
850 283 566 1020 1770 2670 4800 13 300 25 700
900 274 549 990 1710 2590 4650 12 900 24 900
950 266 533 961 1670 2520 4520 12 500 24 200
1000 259 518 935 1620 2450 4400 12 200 23 500
1100 246 492 888 1540 2320 4170 11 500 22 300
1200 234 470 847 1470 2220 3980 11 000 21 300
1300 225 450 811 1410 2120 3810 10 600 20 400
1400 216 432 779 1350 2040 3660 10 100 19 600
1500 208 416 751 1300 1960 3530 9760 18 900
1600 201 402 725 1260 1900 3410 9430 18 200
1700 194 389 702 1220 1840 3300 9130 17 600
1800 188 377 680 1180 1780 3200 8850 17 100
1900 183 366 661 1140 1730 3110 8590 16 600
2000 178 356 643 1110 1680 3020 8360 16 200
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 1215.2(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, I foot= 304.8 mm, 1 000 British thermal units per hour= 0.293 kW, 1 inch water column - 0.249 kPa

Notes:

  • 1 CTS = Copper tube size
  • 2 Table entries are rounded to 3 significant digits.
The inside diameter of smooth-wall pipe or tubing shall be determined by Equation 1215.3(1), Equation 1215.3(2), Table 1215.3 and using the equivalent pipe length determined by the methods in Section 1215.1.1 through Section 1215.1.3. [NFPA 54:6.4]

EQUATION 1215.3(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, inches water column
  • Cr   =    in accordance with Table 1215.3

EQUATION 1215.3(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 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 1215.3
  • Y   =    in accordance with Table 1215.3
For SI units: 1 cubic foot = 0.0283 mm3, 1 000 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 1215.3
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 1215.2(1) through Table 1215.2(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 row 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 this column will be found the correct size of pipe.
  5. Using this same row, proceed in a similar manner to 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.
  7. .

For conditions other than those covered by Section 1215.1, 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 another point of supply and an outlet where full demand is being supplied to all outlets, shall be in accordance with the requirements of Section 1208.4.

Where the supply gas pressure exceeds 5 psi (34.6 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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