ADOPTS WITH AMENDMENTS:

International Residential Code 2018 (IRC 2018)

Part I — Administrative

Part II — Definitions

Part III — Building Planning and Construction

Part IV — Energy Conservation

Part V — Mechanical

Part VI — Fuel Gas

Part VII — Plumbing

Part VIII — Electrical

Part IX — Referenced Standards

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

The text of this chapter is extracted from the 2018 edition of the International Fuel Gas Code and has been modified where necessary to conform to the scope of application of the International Residential Code for One- and Two-Family Dwellings. The section numbers appearing in parentheses after each section number are the section numbers of the corresponding text in the International Fuel Gas Code.

User notes:

About this chapter: Chapter 24 addresses fuel gas piping, appliances, combustion air, appliance venting and specific appliances, among other subjects. Note that Chapter 24 includes definitions that are unique to this chapter. The text of this chapter is identical to that of the International Fuel Gas Code®, except that this chapter contains coverage only for that which is typically found in residential occupancies, consistent with the scope of this code.

Code development reminder: Code change proposals to this chapter will be considered by the IRC—Plumbing/Mechanical Code Development Committee during the 2018 (Group A) Code Development Cycle. See explanation on page iv.

Section G2401 (101) General

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G2401.1 (101.2) Application

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Section G2402 (201) General

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G2402.1 (201.1) Scope

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G2402.2 (201.2) Interchangeability

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G2402.3 (201.3) Terms Defined in Other Codes

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Section G2403 (202) General Definitions

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Section G2404 (301) General

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G2404.1 (301.1) Scope

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G2404.2 (301.1.1) Other Fuels

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G2404.3 (301.3) Listed and Labeled

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G2404.4 (301.8) Vibration Isolation

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G2404.5 (301.9) Repair

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G2404.6 (301.10) Wind Resistance

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G2404.7 (301.11) Flood Hazard

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G2404.8 (301.12) Seismic Resistance

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G2404.9 (301.14) Rodentproofing

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G2404.10 (307.5) Auxiliary Drain Pan

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G2404.11 (307.6) Condensate Pumps

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Section G2405 (302) Structural Safety

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G2405.1 (302.1) Structural Safety

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G2405.2 (302.4) Alterations to Trusses

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G2405.3 (302.3.1) Engineered Wood Products

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Section G2406 (303) Appliance Location

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G2406.1 (303.1) General

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G2406.2 (303.3) Prohibited Locations

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G2406.3 (303.6) Outdoor Locations

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Section G2407 (304) Combustion, Ventilation and Dilution Air

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G2407.1 (304.1) General

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G2407.2 (304.2) Appliance Location

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G2407.3 (304.3) Draft Hood/Regulator Location

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G2407.4 (304.4) Makeup Air Provisions

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G2407.5 (304.5) Indoor Combustion Air

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G2407.5.1 (304.5.1) Standard Method

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G2407.5.2 (304.5.2) Known Air-Infiltration-Rate Method

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G2407.5.3 (304.5.3) Indoor Opening Size and Location

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G2407.5.3.1 (304.5.3.1) Combining Spaces on the Same Story

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G2407.5.3.2 (304.5.3.2) Combining Spaces in Different Stories

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G2407.6 (304.6) Outdoor Combustion Air

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G2407.6.1 (304.6.1) Two-Permanent-Openings Method

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G2407.6.2 (304.6.2) One-Permanent-Opening Method

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G2407.7 (304.7) Combination Indoor and Outdoor Combustion Air

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G2407.7.1 (304.7.1) Indoor Openings

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G2407.7.2 (304.7.2) Outdoor Opening Location

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G2407.7.3 (304.7.3) Outdoor Opening(s) Size

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G2407.8 (304.8) Engineered Installations

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G2407.9 (304.9) Mechanical Combustion Air Supply

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G2407.9.1 (304.9.1) Makeup Air

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G2407.9.2 (304.9.2) Appliance Interlock

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G2407.9.3 (304.9.3) Combined Combustion Air and Ventilation Air System

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G2407.10 (304.10) Louvers and Grilles

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G2407.11 (304.11) Combustion Air Ducts

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G2407.12 (304.12) Protection From Fumes and Gases

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Section G2408 (305) Installation

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G2408.1 (305.1) General

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G2408.2 (305.3) Elevation of Ignition Source

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G2408.2.1 (305.3.1) Installation in Residential Garages

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G2408.3 (305.5) Private Garages

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G2408.4 (305.7) Clearances From Grade

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G2408.5 (305.8) Clearances to Combustible Construction

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G2408.6 (305.12) Avoid Strain on Gas Piping

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Section G2409 (308) Clearance Reduction

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G2409.1 (308.1) Scope

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G2409.2 (308.2) Reduction Table

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G2409.3 (308.3) Clearances for Indoor Air-Conditioning Appliances

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G2409.3.1 (308.3.1) Appliances Clearances

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G2409.3.2 (308.3.2) Clearance Reduction

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G2409.3.3 (308.3.3) Plenum Clearances

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G2409.3.4 (308.3.4) Clearance From Supply Ducts

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G2409.4 (308.4) Central-Heating Boilers and Furnaces

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G2409.4.1 (308.4.1) Appliances Clearances

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G2409.4.2 (308.4.2) Clearance Reduction

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G2409.4.3 (308.4.4) Plenum Clearances

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G2409.4.4 (308.4.5) Clearance From Supply Ducts

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G2409.4.5 (308.4.3) Clearance for Servicing Appliances

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Section G2410 (309) Electrical

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G2410.1 (309.1) Grounding

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G2410.2 (309.2) Connections

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Each above-ground portion of a gas piping system other than corrugated stainless steel tubing (CSST) that is likely to become energized shall be electrically continuous and bonded to an effective ground-fault current path. Gas piping other than CSST shall be considered to be bonded where it is connected to an appliance that is connected to the equipment grounding conductor of the circuit that supplies that appliance.
This section applies to corrugated stainless steel tubing (CSST) that is not listed with an arc-resistant jacket or coating system in accordance with ANSI LC1/CSA 6.26. CSST gas piping systems and piping systems containing one or more segments of CSST shall be electrically continuous and bonded to the electrical service grounding electrode system or, where provided, the lightning protection grounding electrode system.
The bonding jumper shall connect to a metallic pipe, pipe fitting or CSST fitting.
The bonding jumper shall be not smaller than 6 AWG copper wire or equivalent.
The length of the bonding jumper between the connection to a gas piping system and the connection to a grounding electrode system shall not exceed 75 feet (22 860 mm). Any additional grounding electrodes installed to meet this requirement shall be bonded to the electrical service grounding electrode system or, where provided, the lightning protection grounding electrode system.
Bonding connections shall be in accordance with NFPA 70.
Devices used for making the bonding connections shall be listed for the application in accordance with UL 467.
This section applies to corrugated stainless steel tubing (CSST) that is listed with an arc-resistant jacket or coating system in accordance with ANSI LC1/CSA 6.26. The CSST shall be electrically continuous and bonded to an effective ground fault current path. Where any CSST component of a piping system does not have an arc-resistant jacket or coating system, the bonding requirements of Section G2411.2 shall apply. Arc-resistant-jacketed CSST shall be considered to be bonded where it is connected to an appliance that is connected to the appliance grounding conductor of the circuit that supplies that appliance.
This section shall govern the design, installation, modification and maintenance of piping systems. The applicability of this code to piping systems extends from the point of delivery to the connections with the appliances and includes the design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance of such piping systems.
Utility service piping located within buildings shall be installed in accordance with the structural safety and fire protection provisions of this code.
The storage system for liquefied petroleum gas shall be designed and installed in accordance with the International Fire Code and NFPA 58.
In modifying or adding to existing piping systems, sizes shall be maintained in accordance with this chapter.
Where an additional appliance is to be served, the existing piping shall be checked to determine if it has adequate capacity for all appliances served. If inadequate, the existing system shall be enlarged as required or separate piping of adequate capacity shall be provided.
For other than steel pipe, exposed piping shall be identified by a yellow label marked "Gas" in black letters. The marking shall be spaced at intervals not exceeding 5 feet (1524 mm). The marking shall not be required on pipe located in the same room as the appliance served.
Where two or more meters are installed on the same premises but supply separate consumers, the piping systems shall not be interconnected on the outlet side of the meters.
Piping from multiple meter installations shall be marked with an approved permanent identification by the installer so that the piping system supplied by each meter is readily identifiable.
Pipe utilized for the installation, extension and alteration of any piping system shall be sized to supply the full number of outlets for the intended purpose and shall be sized in accordance with Section G2413.

Each length of pipe and tubing and each pipe fitting, utilized in a fuel gas system, shall bear the identification of the manufacturer.

Exceptions:

  1. Steel pipe sections that are 2 feet (610 mm) and less in length and are cut from longer sections of pipe.
  2. Steel pipe fittings 2 inches and less in size.
  3. Where identification is provided on the product packaging or crating.
  4. Where other approved documentation is provided.
Piping, tubing and fittings shall be manufactured to the applicable referenced standards, specifications and performance criteria listed in Section G2414 and shall be identified in accordance with Section G2412.9.
Piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance.

The volumetric flow rate of gas to be provided shall be the sum of the maximum input of the appliances served.

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

The volumetric flow rate of gas to be provided shall be adjusted for altitude where the installation is above 2,000 feet (610 m) in elevation.

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

  1. Pipe sizing tables or sizing equations in accordance with Section G2413.4 or G2413.5, as applicable.
  2. The sizing tables included in a listed piping system's manufacturer's installation instructions.
  3. Other approved engineering methods.

This section applies to piping materials other than noncorrugated stainless steel tubing. Where Tables G2413.4(1) through G2413.4(21) are used to size piping or tubing, the pipe length shall be determined in accordance with Section G2413.4.1, G2413.4.2 or G2413.4.3.

Where Equations 24-3 and 24-4 are used to size piping or tubing, the pipe or tubing shall have smooth inside walls and the pipe length shall be determined in accordance with Section G2413.4.1, G2413.4.2 or G2413.4.3.

  1. Low-pressure gas equation [Less than 11/2 pounds per square inch (psi) (10.3 kPa)]:

    (Equation 24-3)

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

    (Equation 24-4)

where:

D = Inside diameter of pipe, inches (mm).

Q = Input rate appliance(s), cubic feet per hour at 60°F (16°C) and 30-inch mercury column.

P1 = Upstream pressure, psia (P1 + 14.7).

P2 = Downstream pressure, psia (P2 + 14.7).

L = Equivalent length of pipe, feet.

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

TABLE G2413.4 (402.4)

Cr AND Y VALUES FOR NATURAL GAS AND UNDILUTED PROPANE AT STANDARD CONDITIONS

GASEQUATION FACTORS
CrY
Natural gas0.60940.9992
Undiluted propane1.24620.9910

For SI: 1 cubic foot = 0.028 m3, 1 foot = 305 mm, 1-inch water column = 0.249 kPa, 1 pound per square inch = 6.895 kPa, 1 British thermal unit per hour = 0.293 W.

TABLE G2413.4(1) [402.4(2)]

SCHEDULE 40 METALLIC PIPE

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
PIPE SIZE (inches)
Nominal1/23/4111/411/2221/2345681012
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.0265.0476.0657.98110.02011.938
Length (ft)Capacity in Cubic Feet of Gas per Hour
101723606781,3902,0904,0206,40011,30023,10041,80067,600139,000252,000399,000
201182474669571,4302,7604,4007,78015,90028,70046,50095,500173,000275,000
30951993747681,1502,2203,5306,25012,70023,00037,30076,700139,000220,000
40811703206579851,9003,0205,35010,90019,70031,90065,600119,000189,000
50721512845838731,6802,6804,7409,66017,50028,30058,200106,000167,000
60651372575287911,5202,4304,2908,76015,80025,60052,70095,700152,000
70601262374867281,4002,2303,9508,05014,60023,60048,50088,100139,000
80561172204526771,3002,0803,6707,49013,60022,00045,10081,900130,000
90521102074246351,2201,9503,4507,03012,70020,60042,30076,900122,000
100501041954006001,1601,8403,2606,64012,00019,50040,00072,600115,000
12544921733555321,0201,6302,8905,89010,60017,20035,40064,300102,000
15040831573224829281,4802,6105,3309,65015,60032,10058,30092,300
17537771442964438541,3602,4104,9108,88014,40029,50053,60084,900
20034711342754127941,2702,2404,5608,26013,40027,50049,90079,000
25030631192443667041,1201,9804,0507,32011,90024,30044,20070,000
30027571082213316381,0201,8003,6706,63010,70022,10040,10063,400
3502553992033055879351,6503,3706,1009,88020,30036,90058,400
4002349921892835468701,5403,1405,6809,19018,90034,30054,300
4502246861772665128161,4402,9405,3308,62017,70032,20050,900
5002143821682514847711,3602,7805,0308,15016,70030,40048,100
5502041781592394597321,2902,6404,7807,74015,90028,90045,700
6001939741522284386991,2402,5204,5607,38015,20027,50043,600
6501838711452184206691,1802,4104,3607,07014,50026,40041,800
7001736681402094036431,1402,3204,1906,79014,00025,30040,100
7501735661352023896191,0902,2304,0406,54013,40024,40038,600
8001634631301953755981,0602,1603,9006,32013,00023,60037,300
8501633611261893635791,0202,0903,7806,11012,60022,80036,100
9001532591221833525619922,0203,6605,93012,20022,10035,000
9501531581181783425459631,9603,5505,76011,80021,50034,000
1,0001430561151733335309371,9103,4605,60011,50020,90033,100
1,1001428531091643165038901,8103,2805,32010,90019,80031,400
1,2001327511041563014808491,7303,1305,07010,40018,90030,000
1,3001226491001502894608131,6603,0004,8609,98018,10028,700
1,400122547961442774427811,5902,8804,6709,59017,40027,600
1,500112445931392674267521,5302,7804,5009,24016,80026,600
1,600112344891342584117271,4802,6804,3408,92016,20025,600
1,700112242861302503987031,4302,5904,2008,63015,70024,800
1,800102241841262423866821,3902,5204,0708,37015,20024,100
1,900102140811222353756621,3502,4403,9608,13014,80023,400
2,000NA2039791192293646441,3102,3803,8507,91014,40022,700

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. NA means a flow of less than 10 cfh.
  2. Table entries have been rounded to three significant digits.

TABLE G2413.4(2) [402.4(5)]

SCHEDULE 40 METALLIC PIPE

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
PIPE SIZE (inches)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Cubic Feet of Gas per Hour
101,5103,0405,56011,40017,10032,90052,50092,800189,000
201,0702,1503,9308,07012,10023,30037,10065,600134,000
308691,7603,2106,5909,88019,00030,30053,600109,000
407531,5202,7805,7108,55016,50026,30046,40094,700
506731,3602,4905,1107,65014,70023,50041,50084,700
606151,2402,2704,6606,98013,50021,40037,90077,300
705691,1502,1004,3206,47012,50019,90035,10071,600
805321,0801,9704,0406,05011,70018,60032,80067,000
905021,0101,8503,8105,70011,00017,50030,90063,100
1004629341,7103,5105,26010,10016,10028,50058,200
1254148361,5303,1404,7009,06014,40025,50052,100
1503727511,3702,8204,2208,13013,00022,90046,700
1753446951,2702,6013,9107,53012,00021,20043,300
2003186421,1702,4103,6106,96011,10019,60040,000
2502795831,0402,1403,2106,1809,85017,40035,500
3002535289451,9402,9105,6008,92015,80032,200
3502324868691,7902,6705,1508,21014,50029,600
4002164528091,6602,4904,7907,64013,50027,500
4502034247591,5602,3304,5007,17012,70025,800
5001924017171,4702,2104,2506,77012,00024,400
5501823816811,4002,0904,0306,43011,40023,200
6001743636501,3302,0003,8506,13010,80022,100
6501663486221,2801,9103,6805,87010,40021,200
7001603345981,2301,8403,5405,6409,97020,300
7501543225761,1801,7703,4105,4409,61019,600
8001493115561,1401,7103,2905,2509,28018,900
8501443015381,1001,6503,1905,0808,98018,300
9001392925221,0701,6003,0904,9308,71017,800
9501352835071,0401,5603,0004,7808,46017,200
1,0001322754931,0101,5202,9204,6508,22016,800
1,1001252624689601,4402,7704,4207,81015,900
1,2001192504469171,3702,6404,2207,45015,200
1,3001142394278781,3202,5304,0407,14014,600
1,4001102304118431,2602,4303,8806,86014,000
1,5001062213968121,2202,3403,7406,60013,500
1,6001022143827841,1802,2603,6106,38013,000
1,700992073707591,1402,1903,4906,17012,600
1,800962003587361,1002,1203,3905,98012,200
1,900931953487151,0702,0603,2905,81011,900
2,000911893396951,0402,0103,2005,65011,500

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(3) [402.4(9)]

SEMIRIGID COPPER TUBING

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
TUBE SIZE (inches)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Cubic Feet of Gas per Hour
1027551111952765901,0601,6803,490
201838771341904067301,1502,400
301530611071523265869251,930
40132653921312795027911,650
50112347821162474457011,460
60102142741052244036351,320
70NA193968962063715851,220
80NA183663901923455441,130
90NA173459841803245101,060
100NA163256791703064821,000
125NA14285070151271427890
150NA13264564136245387806
175NA12244159125226356742
200NA11223955117210331690
250NANA203448103186294612
300NANA18314494169266554
350NANA16284086155245510
400NANA15263880144228474
450NANA14253575135214445
500NANA13233371128202420
550NANA13223268122192399
600NANA12213064116183381
650NANA12202962111175365
700NANA11202859107168350
750NANA11192757103162338
800NANA1018265599156326
850NANA1018255396151315
900NANANA17245293147306
950NANANA17245090143297
1,000NANANA16234988139289
1,100NANANA15224684132274
1,200NANANA15214480126262
1,300NANANA14204276120251
1,400NANANA13194173116241
1,500NANANA13183971111232
1,600NANANA13183868108224
1,700NANANA12173766104217
1,800NANANA12173664101210
1,900NANANA1116356298204
2,000NANANA1116346095199

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. Table entries have been rounded to three significant digits.

TABLE G2413.4(4) [402.4(12)]

SEMIRIGID COPPER TUBING

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
TUBE SIZE (inches)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Cubic Feet of Gas per Hour
102455061,0301,8002,5505,4509,82015,50032,200
201693487081,2401,7603,7506,75010,60022,200
301352795689931,4103,0105,4208,55017,800
401162394868501,2102,5804,6407,31015,200
501032124317541,0702,2804,1106,48013,500
60931923916839692,0703,7305,87012,200
70861773596288911,9003,4305,40011,300
80801643345848291,7703,1905,03010,500
90751543145487781,6602,9904,7209,820
100711462965187351,5702,8304,4509,280
125631292634596511,3902,5003,9508,220
150571172384165901,2602,2703,5807,450
175521082193835431,1602,0903,2906,850
200491002043565051,0801,9403,0606,380
25043891813154489561,7202,7105,650
30039801642864068661,5602,4605,120
35036741502633737971,4302,2604,710
40033691402453477411,3302,1004,380
45031651312303266961,2501,9704,110
50030611242173086571,1801,8703,880
55028581182062926241,1201,7703,690
60027551121962795951,0701,6903,520
65026531081882675701,0301,6203,370
70025511031812565489861,5503,240
75024491001742475289501,5003,120
8002347961682395109171,4503,010
8502246931632314938881,4002,920
9002244901582244788611,3602,830
9502143881532174648361,3202,740
1,0002042851492114528131,2802,670
1,1001940811422014297721,2202,540
1,2001838771351924097371,1602,420
1,3001836741291833927051,1102,320
1,4001735711241763766781,0702,230
1,5001634681201703636531,0302,140
1,6001633661161643506309942,070
1,7001531641121593396109622,000
1,8001530621081543295929331,940
1,9001430601051493195759061,890
2,0001429591021453105598811,830

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. Table entries have been rounded to three significant digits.

TABLE G2413.4(5) [402.4(15)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Cubic Feet of Gas per Hour
546631151342252704715468951,0371,7902,0703,6604,140
10324482951611923303836397461,2601,4702,6002,930
15253566771321572673105246151,0301,2002,1402,400
20223158671161372312694565368881,0501,8502,080
25192752601041222062404094827939361,6601,860
3018254755961121882183744427238561,5201,700
401521414783971621883253866257421,3201,470
501319374275871441682923475596651,1801,320
601217343868801311532673185096081,0801,200
701116313663741211412482954715631,0001,110
801015293360691131322322774405279401,040
90101428325765107125219262415498887983
10091326305462101118208249393472843933
150710202342487891171205320387691762
20069182138447182148179277336600661
25058161934396374133161247301538591
3005715173236576795148226275492540

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. Table entries have been rounded to three significant digits.

TABLE G2413.4(6) [402.4(18)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Cubic Feet of Gas Per Hour
102703535877001,1001,3702,5902,9904,5105,0379,60010,70018,60021,600
251662203744447098761,6201,8702,8903,2586,0406,78011,90013,700
301512003424056508011,4801,7002,6402,9875,5106,20010,90012,500
401291722973515676961,2701,4702,3002,6054,7605,3809,44010,900
501151542663145106241,1401,3102,0602,3434,2604,8208,4709,720
75931242182574205129221,0701,6901,9323,4703,9506,9407,940
80891202112494074968921,0301,6401,8743,3603,8206,7307,690
100791071892223664457959201,4701,6853,0003,4206,0306,880
15064871551823023646467481,2101,3892,4402,8004,9405,620
20055751351572633175576451,0501,2122,1102,4304,2904,870
25049671211412362844975769411,0901,8902,1803,8504,360
30044611101292172604535258629991,7201,9903,5203,980
4003852961111892253904537498711,4901,7303,0603,450
5003446861001702023484045527831,3301,5502,7403,090

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 3/4 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator can vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. Table entries have been rounded to three significant digits.

TABLE G2413.4(7) [402.4(21)]

POLYETHYLENE PLASTIC PIPE

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
PIPE SIZE (inches)
Nominal OD1/23/4111/411/22
DesignationSDR 9SDR 11SDR 11SDR 10SDR 11SDR 11
Actual ID0.6600.8601.0771.3281.5541.943
Length (ft)Capacity in Cubic Feet of Gas per Hour
102014037261,2601,9003,410
201382774998651,3102,350
301112224016951,0501,880
40951903435948981,610
50841693045277961,430
60761532764777211,300
70701402544396631,190
80651312364096171,110
90611232213835791,040
10058116209362547983
12551103185321485871
1504693168291439789
1754386154268404726
2004080144249376675
2503571127221333598
3003264115200302542
3502959106184278499
400275599171258464
450265193160242435
500244888152229411

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(8) [402.4(22)]

POLYETHYLENE PLASTIC PIPE

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
PIPE SIZE (inches)
Nominal OD1/23/4111/411/22
DesignationSDR 9SDR 11SDR 11SDR 10SDR 11SDR 11
Actual ID0.6600.8601.0771.3281.5541.943
Length (ft)Capacity in Cubic Feet of Gas per Hour
101,8603,7206,71011,60017,60031,600
201,2802,5604,6107,99012,10021,700
301,0302,0503,7106,4209,69017,400
408781,7603,1705,4908,30014,900
507781,5602,8104,8707,35013,200
607051,4102,5504,4106,66012,000
706491,3002,3404,0606,13011,000
806031,2102,1803,7805,70010,200
905661,1302,0503,5405,3509,610
1005351,0701,9303,3505,0509,080
1254749491,7102,9704,4808,050
1504298601,5502,6904,0607,290
1753957911,4302,4703,7306,710
2003687361,3302,3003,4706,240
2503266521,1802,0403,0805,530
3002955911,0701,8502,7905,010
3502725449811,7002,5704,610
4002535069131,5802,3904,290
4502374758561,4802,2404,020
5002244488091,4002,1203,800
5502134267681,3302,0103,610
6002034067331,2701,9203,440
6501943897021,2201,8403,300
7001873746741,1701,7603,170
7501803606491,1301,7003,050
8001743486271,0901,6402,950
8501683366071,0501,5902,850
9001633265881,0201,5402,770
9501583175729901,5002,690
1,0001543085569631,4502,610
1,1001462935289151,3802,480
1,2001392795048731,3202,370
1,3001342674828361,2602,270
1,4001282574638031,2102,180
1,5001242474467731,1702,100
1,6001192394317471,1302,030
1,7001152314177231,0901,960
1,8001122244047011,0601,900
1,9001092183936801,0301,850
2,0001062123826621,0001,800

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(9) [402.4(25)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure10.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USEPipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (inches)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
103,3206,95013,10026,90040,30077,600124,000219,000446,000
202,2804,7809,00018,50027,70053,30085,000150,000306,000
301,8303,8407,22014,80022,20042,80068,200121,000246,000
401,5703,2806,18012,70019,00036,60058,400103,000211,000
501,3902,9105,48011,30016,90032,50051,70091,500187,000
601,2602,6404,97010,20015,30029,40046,90082,900169,000
701,1602,4304,5709,38014,10027,10043,10076,300156,000
801,0802,2604,2508,73013,10025,20040,10070,900145,000
901,0102,1203,9908,19012,30023,60037,70066,600136,000
1009562,0003,7707,73011,60022,30035,60062,900128,000
1258481,7703,3406,85010,30019,80031,50055,700114,000
1507681,6103,0206,2109,30017,90028,60050,500103,000
1757061,4802,7805,7108,56016,50026,30046,50094,700
2006571,3702,5905,3207,96015,30024,40043,20088,100
2505821,2202,2904,7107,06013,60021,70038,30078,100
3005281,1002,0804,2706,40012,30019,60034,70070,800
3504861,0201,9103,9305,88011,30018,10031,90065,100
4004529451,7803,6505,47010,50016,80029,70060,600
4504248861,6703,4305,1409,89015,80027,90056,800
5004008371,5803,2404,8509,34014,90026,30053,700
5503807951,5003,0704,6108,87014,10025,00051,000
6003637591,4302,9304,4008,46013,50023,90048,600
6503477261,3702,8104,2108,11012,90022,80046,600
7003346981,3102,7004,0407,79012,40021,90044,800
7503216721,2702,6003,9007,50012,00021,10043,100
8003106491,2202,5103,7607,24011,50020,40041,600
8503006281,1802,4303,6407,01011,20019,80040,300
9002916091,1502,3603,5306,80010,80019,20039,100
9502835921,1102,2903,4306,60010,50018,60037,900
1,0002755751,0802,2303,3306,42010,20018,10036,900
1,1002615461,0302,1103,1706,1009,72017,20035,000
1,2002495219822,0203,0205,8209,27016,40033,400
1,3002394999401,9302,8905,5708,88015,70032,000
1,4002294809031,8502,7805,3508,53015,10030,800
1,5002214628701,7902,6805,1608,22014,50029,600
1,6002134468401,7302,5904,9807,94014,00028,600
1,7002064328131,6702,5004,8207,68013,60027,700
1,8002004197891,6202,4304,6707,45013,20026,900
1,9001944077661,5702,3604,5407,23012,80026,100
2,0001893957451,5302,2904,4107,03012,40025,400

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(10) [402.4(26)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure10.0 psi
Pressure Drop3.0 psi
Specific Gravity1.50
INTENDED USEPipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (inches)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
105,89012,30023,20047,60071,300137,000219,000387,000789,000
204,0508,46015,90032,70049,00094,400150,000266,000543,000
303,2506,79012,80026,30039,40075,800121,000214,000436,000
402,7805,81011,00022,50033,70064,900103,000183,000373,000
502,4605,1509,71019,90029,90057,50091,600162,000330,000
602,2304,6708,79018,10027,10052,10083,000147,000299,000
702,0504,3008,09016,60024,90047,90076,400135,000275,000
801,9104,0007,53015,50023,20044,60071,100126,000256,000
901,7903,7507,06014,50021,70041,80066,700118,000240,000
1001,6903,5406,67013,70020,50039,50063,000111,000227,000
1251,5003,1405,91012,10018,20035,00055,80098,700201,000
1501,3602,8405,36011,00016,50031,70050,60089,400182,000
1751,2502,6204,93010,10015,20029,20046,50082,300167,800
2001,1602,4304,5809,41014,10027,20043,30076,500156,100
2501,0302,1604,0608,34012,50024,10038,40067,800138,400
3009351,9503,6807,56011,30021,80034,80061,500125,400
3508601,8003,3906,95010,40020,10032,00056,500115,300
4008001,6703,1506,4709,69018,70029,80052,600107,300
4507511,5702,9606,0709,09017,50027,90049,400100,700
5007091,4802,7905,7308,59016,50026,40046,60095,100
5506731,4102,6505,4508,16015,70025,00044,30090,300
6006421,3402,5305,2007,78015,00023,90042,20086,200
6506151,2902,4204,9807,45014,40022,90040,50082,500
7005911,2402,3304,7807,16013,80022,00038,90079,300
7505691,1902,2404,6006,90013,30021,20037,40076,400
8005501,1502,1704,4506,66012,80020,50036,20073,700
8505321,1102,1004,3006,45012,40019,80035,00071,400
9005161,0802,0304,1706,25012,00019,20033,90069,200
9505011,0501,9704,0506,07011,70018,60032,90067,200
1,0004871,0201,9203,9405,90011,40018,10032,00065,400
1,1004639681,8203,7405,61010,80017,20030,40062,100
1,2004429231,7403,5705,35010,30016,40029,00059,200
1,3004238841,6703,4205,1209,87015,70027,80056,700
1,4004068491,6003,2804,9209,48015,10026,70054,500
1,5003918181,5403,1604,7409,13014,60025,70052,500
1,6003787901,4903,0604,5808,82014,10024,80050,700
1,7003667651,4402,9604,4308,53013,60024,00049,000
1,8003557411,4002,8704,3008,27013,20023,30047,600
1,9003447201,3602,7804,1708,04012,80022,60046,200
2,0003357001,3202,7104,0607,82012,50022,00044,900

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(11) [402.4(27)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USEPipe sizing between 2 psig service and line pressure regulator.
PIPE SIZE (inches)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
102,6805,59010,50021,60032,40062,40099,500176,000359,000
201,8403,8507,24014,90022,30042,90068,400121,000247,000
301,4803,0905,82011,90017,90034,50054,90097,100198,000
401,2602,6404,98010,20015,30029,50047,00083,100170,000
501,1202,3404,4109,06013,60026,10041,70073,700150,000
601,0102,1204,0008,21012,30023,70037,70066,700136,000
709341,9503,6807,55011,30021,80034,70061,400125,000
808691,8203,4207,02010,50020,30032,30057,100116,000
908151,7003,2106,5909,88019,00030,30053,600109,000
1007701,6103,0306,2309,33018,00028,60050,600103,000
1256821,4302,6905,5208,27015,90025,40044,90091,500
1506181,2902,4405,0007,49014,40023,00040,70082,900
1755691,1902,2404,6006,89013,30021,20037,40076,300
2005291,1102,0804,2806,41012,30019,70034,80071,000
2504699811,8503,7905,68010,90017,40030,80062,900
3004258891,6703,4405,1509,92015,80027,90057,000
3503918171,5403,1604,7409,12014,50025,70052,400
4003647601,4302,9404,4108,49013,50023,90048,800
4503417141,3402,7604,1307,96012,70022,40045,800
5003226741,2702,6103,9107,52012,00021,20043,200
5503066401,2102,4803,7107,14011,40020,10041,100
6002926111,1502,3603,5406,82010,90019,20039,200
6502805851,1002,2603,3906,53010,40018,40037,500
7002695621,0602,1703,2606,2709,99017,70036,000
7502595411,0202,0903,1406,0409,63017,00034,700
8002505239852,0203,0305,8309,30016,40033,500
8502425069531,9602,9305,6409,00015,90032,400
9002354909241,9002,8405,4708,72015,40031,500
9502284768971,8402,7605,3108,47015,00030,500
1,0002224638731,7902,6805,1708,24014,60029,700
1,1002104408291,7002,5504,9107,83013,80028,200
1,2002014207911,6202,4304,6807,47013,20026,900
1,3001924027571,5502,3304,4907,15012,60025,800
1,4001853867271,4902,2404,3106,87012,10024,800
1,5001783727011,4402,1604,1506,62011,70023,900
1,6001723596771,3902,0804,0106,39011,30023,000
1,7001663486551,3402,0103,8806,18010,90022,300
1,8001613376351,3001,9503,7606,00010,60021,600
1,9001573276171,2701,9003,6505,82010,30021,000
2,0001523186001,2301,8403,5505,66010,00020,400

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(12) [402.4(28)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USEPipe sizing between single- or second-stage (low pressure) regulator and appliance.
PIPE SIZE (inches)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
102916081,1502,3503,5206,79010,80019,10039,000
202004187871,6202,4204,6607,43013,10026,800
301603366321,3001,9403,7505,97010,60021,500
401372875411,1101,6603,2105,1109,03018,400
501222554809851,4802,8404,5308,00016,300
601102314348921,3402,5704,1007,25014,800
801012124008211,2302,3703,7706,67013,600
100941973727631,1402,2003,5106,21012,700
125891853497161,0702,0703,2905,82011,900
150841753306771,0101,9503,1105,50011,200
175741552926008991,7302,7604,8809,950
200671402655438141,5702,5004,4209,010
250621292435007491,4402,3004,0608,290
300581202274656971,3402,1403,7807,710
350511072014126181,1901,9003,3506,840
40046971823735601,0801,7203,0406,190
45042891673445159911,5802,7905,700
50040831563204799221,4702,6005,300
55037781463004498651,3802,4404,970
60035731382834248171,3002,3004,700
65033701312694037761,2402,1904,460
70032661252573857411,1802,0904,260
75030641202463687091,1302,0004,080
80029611152363546811,0901,9203,920
85028591112273416561,0501,8503,770
90027571072203296341,0101,7903,640
95026551042133196139781,7303,530
1,00025531002063095959481,6803,420
1,1002552972003005789211,6303,320
1,2002450951952925628951,5803,230
1,3002348901852775348501,5003,070
1,4002246861762645098111,4302,930
1,5002144821692534877771,3702,800
1,2002450951952925628951,5803,230
1,3002348901852775348501,5003,070
1,4002246861762645098111,4302,930
1,5002144821692534877771,3702,800
1,6002042791622434687461,3202,690
1,7001940761562344517191,2702,590
1,8001939741512264366941,2302,500
1,9001838711462194226721,1902,420
2,0001837691422124096521,1502,350

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(13) [402.4(29)]

SEMIRIGID COPPER TUBING

GasUndiluted Propane
Inlet Pressure10.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USESizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
TUBE SIZE (inches)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Thousands of Btu per Hour
105131,0602,1503,7605,33011,40020,50032,30067,400
203527271,4802,5803,6707,83014,10022,20046,300
302835841,1902,0802,9406,29011,30017,90037,200
402425001,0201,7802,5205,3809,69015,30031,800
502154439011,5702,2304,7708,59013,50028,200
601944018161,4302,0204,3207,78012,30025,600
701793697511,3101,8603,9807,16011,30023,500
801663436991,2201,7303,7006,66010,50021,900
901563226551,1501,6303,4706,2509,85020,500
1001473046191,0801,5403,2805,9009,31019,400
1251312705499591,3602,9105,2308,25017,200
1501182444978691,2302,6304,7407,47015,600
1751092254577991,1302,4204,3606,88014,300
2001012094267441,0602,2504,0606,40013,300
250901853776599352,0003,6005,67011,800
300811683425978471,8103,2605,14010,700
350751553145497791,6603,0004,7309,840
400701442925117251,5502,7904,4009,160
450651352744806801,4502,6204,1308,590
500621272594536431,3702,4703,9008,120
550591212464306101,3002,3503,7007,710
600561152354105821,2402,2403,5307,350
650541112253935581,1902,1403,3807,040
700511062163785361,1402,0603,2506,770
750501022083645161,1001,9803,1306,520
80048992013514981,0601,9203,0206,290
85046961953404821,0301,8502,9206,090
90045931893304681,0001,8002,8405,910
95044901833204549701,7502,7505,730
1,00042881783114429441,7002,6805,580
1,10040831692964208961,6102,5405,300
1,20038791612824008551,5402,4305,050
1,30037761552703838191,4702,3204,840
1,40035731482603687871,4202,2304,650
1,50034701432503557581,3602,1504,480
1,60033681382413437321,3202,0804,330
1,70032661342343317081,2702,0104,190
1,80031641302273216871,2401,9504,060
1,90030621262203126671,2001,8903,940
2,00029601222143046481,1701,8403,830

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. Table entries have been rounded to three significant digits.

TABLE G2413.4(14) [402.4(30)]

SEMIRIGID COPPER TUBING

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USESizing between single- or second-stage (low-pressure regulator) and appliance.
TUBE SIZE (inches)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Thousands of Btu per Hour
1045931883294679971,8002,8305,890
2031641292263216851,2301,9504,050
3025511041822585509911,5603,250
402144891552204718481,3402,780
501939791381954177521,1802,470
601735711251773786811,0702,240
701632661151633486269882,060
801530611071523245839191,910
901428571001423045478621,800
100132754951342875178141,700
125112448841192544587221,500
150102144761082304156541,360
175NA204070992123826021,250
200NA183765921973555601,170
250NA163358821753154961,030
300NA15305274158285449936
350NA14284868146262414861
400NA13264563136244385801
450NA12244260127229361752
500NA11234056120216341710
550NA11223853114205324674
600NA10213651109196309643
650NANA203449104188296616
700NANA193347100180284592
750NANA18324596174274570
800NANA18314493168264551
850NANA17304290162256533
900NANA17294187157248517
950NANA16284085153241502
1,000NANA16273983149234488
1,100NANA15263778141223464
1,200NANA14253575135212442
1,300NANA14243472129203423
1,400NANA13233269124195407
1,500NANA13223166119188392
1,600NANA12213064115182378
1,700NANA12202962112176366
1,800NANA11202860108170355
1,900NANA11192758105166345
2,000NANA11192757102161335

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

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

TABLE G2413.4(15) [402.4(31)]

SEMIRIGID COPPER TUBING

GasUndiluted Propane
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USETube sizing between 2 psig service and line pressure regulator.
TUBE SIZE (inches)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Thousands of Btu per Hour
104138521,7303,0304,3009,17016,50026,00054,200
202845851,1902,0802,9506,31011,40017,90037,300
302284709561,6702,3705,0609,12014,40029,900
401954028181,4302,0304,3307,80012,30025,600
501733567251,2701,8003,8406,92010,90022,700
601573236571,1501,6303,4806,2709,88020,600
701442976051,0601,5003,2005,7609,09018,900
801342765629831,3902,9805,3608,45017,600
901262595289221,3102,7905,0307,93016,500
1001192454988711,2402,6404,7507,49015,600
1251052174427721,1002,3404,2106,64013,800
150951974007009922,1203,8206,02012,500
175881813686449131,9503,5105,54011,500
200821683435998491,8103,2705,15010,700
250721493045317531,6102,9004,5609,510
300661352754816821,4602,6204,1408,610
350601242534426281,3402,4103,8007,920
400561162354115841,2502,2503,5407,370
450531092213865481,1702,1103,3206,920
500501032093655171,1101,9903,1406,530
55047971983464911,0501,8902,9806,210
60045931893304691,0001,8002,8405,920
65043891813164499591,7302,7205,670
70041861743044319211,6602,6205,450
75040821682934158881,6002,5205,250
80039801622834018571,5402,4305,070
85037771572743888291,4902,3504,900
90036751522653768041,4502,2804,750
95035721472583667811,4102,2204,620
1,00034711432513567601,3702,1604,490
1,10032671362383387211,3002,0504,270
1,20031641302273226881,2401,9504,070
1,30030611242173096591,1901,8703,900
1,40028591202092966331,1401,8003,740
1,50027571152012866101,1001,7303,610
1,60026551111942765891,0601,6703,480
1,70026531081882675701,0301,6203,370
1,80025511041822595531,0001,5703,270
1,90024501011772515379661,5203,170
2,0002348991722445229401,4803,090

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. Table entries have been rounded to three significant digits.

TABLE G2413.4(16) [402.4(32)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USE: SIZING BETWEEN SINGLE OR SECOND STAGE (Low Pressure) REGULATOR AND THE APPLIANCE SHUTOFF VALVE.
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Thousands of Btu per Hour
572991812113554267448631,4201,6382,8303,2705,7806,550
1050691291502543035216059711,1791,9902,3204,1104,640
1539551041212082484224907759721,6201,9003,3703,790
203449911061832163654256618471,4001,6502,9303,290
25304282941641923253795837621,2501,4802,6302,940
30283974871511772973445286981,1401,3502,4002,680
40233364741311532562974496109881,1702,0902,330
50203058661181372272653975488841,0501,8702,080
60192653601071262072413595028059611,7101,900
7017254957991171912223304667458901,5901,760
8015234552941091782083074386968331,4901,650
9015224450901021691972864146567871,4001,550
1001420414785981591862703936217461,3301,480
1501115313666751231432173245066111,0901,210
200914283360691121291832834385319481,050
2508122530536199117163254390476850934
3008112326505790107147234357434777854

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. Table entries have been rounded to three significant digits.

TABLE G2413.4(17) [402.4(33)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasUndiluted Propane
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USE: SIZING BETWEEN 2 PSI SERVICE AND THE LINE PRESSURE REGULATOR.
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Thousands of Btu per Hour
104265589271,1101,7402,1704,1004,7207,1307,95815,20016,80029,40034,200
252623475917011,1201,3802,5602,9504,5605,1479,55010,70018,80021,700
302383165406401,0301,2702,3302,6904,1804,7198,7109,79017,20019,800
402032714695548961,1002,0102,3203,6304,1167,5308,50014,90017,200
501812434204968069861,7902,0703,2603,7026,7307,61013,40015,400
751471963444066638091,4601,6902,6803,0535,4806,23011,00012,600
801401893333936437681,4101,6302,5902,9615,3006,04010,60012,200
1001241692983505787031,2601,4502,3302,6624,7405,4109,53010,900
1501011372452874775751,0201,1801,9102,1953,8604,4307,8108,890
200861182132484155018801,0201,6601,9153,3403,8406,7807,710
250771051912223734487859101,4901,7222,9803,4406,0806,900
30069961732033434117168291,3601,5782,7203,1505,5606,300
40060821511752983556167161,1601,3762,3502,7304,8305,460
50053721351582683195506381,0301,2372,1002,4504,3304,880

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 1/2 psi (based on 13 in. w.c. outlet pressure), DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator can vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. Table entries have been rounded to three significant digits.

TABLE G2413.4(18) [402.4(34)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasUndiluted Propane
Inlet Pressure5.0 psi
Pressure Drop3.5 psi
Specific Gravity1.50
TUBE SIZE (EHD)
Flow Designation1315181923253031373946486062
Length (ft)Capacity in Thousands of Btu per Hour
108261,0701,7102,0603,1504,0007,8308,95013,10014,44128,60031,20054,40063,800
255096641,0901,3102,0402,5504,8605,6008,4009,33918,00019,90034,70040,400
304616039991,1901,8702,3404,4305,1007,6808,56416,40018,20031,70036,900
403965208671,0301,6302,0303,8204,4006,6807,46914,20015,80027,60032,000
503524637779261,4601,8203,4103,9305,9906,71712,70014,10024,70028,600
752843766377571,2101,4902,7703,1904,9205,53910,30011,60020,30023,400
802753636187311,1701,4502,6803,0904,7705,3729,99011,20019,60022,700
1002433245536561,0501,3002,3902,7604,2804,8308,93010,00017,60020,300
1501962624535358661,0601,9402,2403,5103,9837,2708,21014,40016,600
2001692263934647559231,6801,9303,0503,4746,2907,13012,50014,400
2501502023524156798281,4901,7302,7403,1245,6206,39011,20012,900
3001361833223796227571,3601,5702,5102,8655,1205,84010,30011,700
4001171582793285426571,1701,3602,1802,4984,4305,0708,92010,200
5001041402512944885891,0501,2101,9502,2473,9604,5408,0009,110

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Notes:

  1. Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds1 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drop across regulator can vary with the flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity of selected regulator. Consult with the tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. Table entries have been rounded to three significant digits.

TABLE G2413.4(19) [402.4(35)]

POLYETHYLENE PLASTIC PIPE

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USEPE pipe sizing between integral 2-stage regulator at tank or second stage (low-pressure regulator) and building.
PIPE SIZE (inches)
Nominal OD1/23/4111/411/22
DesignationSDR 9SDR 11SDR 11SDR 10SDR 11SDR 11
Actual ID0.6600.8601.0771.3281.5541.943
Length (ft)Capacity in Thousands of Btu per Hour
103406801,2302,1303,2105,770
202334688441,4602,2103,970
301873756771,1701,7703,180
401603215801,0001,5202,730
501422855148901,3402,420
601292584668071,2202,190
701192374287421,1202,010
801102213986901,0401,870
901032073746489781,760
100981963536129241,660
125871733135428191,470
150781572844917421,330
175721452614526831,230
200671352434206351,140
250601192153735631,010
30054108195338510916
3505099179311469843
4004692167289436784
4504387157271409736
5004182148256387695

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(20) [402.4(36)]

POLYETHYLENE PLASTIC PIPE

GasUndiluted Propane
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USEPE pipe sizing between 2 psig service regulator and line pressure regulator.
PIPE SIZE (inches)
Nominal OD1/23/4111/411/22
DesignationSDR 9SDR 11SDR 11SDR 10SDR 11SDR 11
Actual ID0.6600.8601.0771.3281.5541.943
Length (ft)Capacity in Thousands of Btu per Hour
103,1306,26011,30019,60029,50053,100
202,1504,3007,76013,40020,30036,500
301,7303,4506,23010,80016,30029,300
401,4802,9605,3309,24014,00025,100
501,3102,6204,7308,19012,40022,200
601,1902,3704,2807,42011,20020,100
701,0902,1803,9406,83010,30018,500
801,0102,0303,6706,3509,59017,200
909521,9103,4405,9609,00016,200
1008991,8003,2505,6308,50015,300
1257971,6002,8804,9907,53013,500
1507221,4502,6104,5206,83012,300
1756641,3302,4004,1606,28011,300
2006181,2402,2303,8705,84010,500
2505481,1001,9803,4305,1809,300
3004969941,7903,1104,6908,430
3504579141,6502,8604,3207,760
4004258511,5302,6604,0207,220
4503997981,4402,5003,7706,770
5003777541,3602,3603,5606,390
5503587161,2902,2403,3806,070
6003416831,2302,1403,2205,790
6503276541,1802,0403,0905,550
7003146281,1301,9602,9705,330
7503026051,0901,8902,8605,140
8002925851,0501,8302,7604,960
8502835661,0201,7702,6704,800
9002745499901,7102,5904,650
9502665339611,6702,5204,520
1,0002595189351,6202,4504,400
1,1002464928881,5402,3204,170
1,2002344708471,4702,2203,980
1,3002254508111,4102,1203,810
1,4002164327791,3502,0403,660
1,5002084167511,3001,9603,530
1,6002014027251,2601,9003,410
1,7001943897021,2201,8403,300
1,8001883776801,1801,7803,200
1,9001833666611,1401,7303,110
2,0001783566431,1101,6803,020

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

TABLE G2413.4(21) [402.4(37)]

POLYETHYLENE PLASTIC TUBING

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USE: PE PIPE SIZING BETWEEN INTEGRAL 2-STAGE REGULATOR AT TANK OR SECOND STAGE (low-pressure regulator) AND BUILDING.
Plastic Tubing Size (CTS) (inch)
Nominal OD1/21
DesignationSDR 7SDR 11
Actual ID0.4450.927
Length (ft)Capacity in Cubic Feet of Gas per Hour
10121828
2083569
3067457
4057391
5051347
6046314
7042289
8039269
9037252
10035238
12531211
15028191
17526176
20024164
22522154
25021145
27520138
30019132
35018121
40016113
45015106
50015100

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.

Note: Table entries have been rounded to three significant digits.

The pipe size of each section of gas piping shall be determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section.

Pipe shall be sized as follows:

  1. Pipe size of each section of the longest pipe run from the point of delivery to the most remote outlet shall be determined using the longest run of piping and the load of the section.
  2. The pipe size of each section of branch piping not previously sized shall be determined using the length of piping from the point of delivery to the most remote outlet in each branch and the load of the section.
The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The pipe size from the line pressure regulator to each outlet shall be determined using the length of piping from the regulator to the most remote outlet served by the regulator.
Noncorrugated stainless steel tubing shall be sized in accordance with Equations 24-3 and 24-4 of Section 2413.4 in conjunction with Section 2413.4.1, 2413.4.2 or 2413.4.3.
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.

The maximum design operating pressure for piping systems located inside buildings shall not exceed 5 pounds per square inch gauge (psig) (34 kPa gauge) except where one or more of the following conditions are met:

  1. The piping joints are welded or brazed.
  2. The piping joints are flanged and pipe-to-flange connections are made by welding or brazing.
  3. The piping is located in a ventilated chase or otherwise enclosed for protection against accidental gas accumulation.
  4. The piping is a temporary installation for buildings under construction.
LP-gas systems designed to operate below -5°F (-21°C) or with butane or a propane-butane mix shall be designed to either accommodate liquid LP-gas or prevent LP-gas vapor from condensing into a liquid.
Materials used for piping systems shall comply with the requirements of this chapter or shall be approved.
Pipe, fittings, valves or other materials shall not be used again unless they are free from foreign materials and have been ascertained to be adequate for the service intended.
Material not covered by the standards specifications listed herein shall be investigated and tested to determine that it is safe and suitable for the proposed service, and, in addition, shall be recommended for that service by the manufacturer and shall be approved by the code official.
Metallic pipe shall comply with Sections G2414.4.1 and G2414.4.2.
Cast-iron pipe shall not be used.

Steel, stainless steel and wrought-iron pipe shall not be lighter than Schedule 10 and shall comply with the dimensional standards of ASME B36.10, 10M and one of the following standards:

  1. ASTM A53/A53M.
  2. ASTM A106.
  3. ASTM A312.
Tubing shall not be used with gases corrosive to the tubing material.
Steel tubing shall comply with ASTM A254.
Stainless steel tubing shall comply with ASTM A268 or ASTM A269.

Copper tubing shall comply with Standard Type K or L of ASTM B88 or ASTM B280.

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

Corrugated stainless steel tubing shall be listed in accordance with ANSI LC1/CSA 6.26.

Polyethylene plastic pipe, tubing and fittings used to supply fuel gas shall conform to ASTM D2513. Such pipe shall be marked "Gas" and "ASTM D2513."

Polyamide pipe, tubing and fittings shall be identified and conform to ASTM F2945. Such pipe shall be marked "Gas" and "ASTM F2945."

Polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) plastic pipe, tubing and fittings shall not be used to supply fuel gas.

Plastic pipe, tubing and anodeless risers shall comply with the following:

  1. Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak tested by the manufacturer in accordance with written procedures.
  2. Service head adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used, and shall be designed and certified to meet the requirements of Category I of ASTM D2513, and U.S. Department of Transportation, Code of Federal Regulations, Title 49, Part 192.281(e). The manufacturer shall provide the user with qualified installation instructions as prescribed by the U.S. Department of Transportation, Code of Federal Regulations, Title 49, Part 192.283(b).
The use of plastic pipe, tubing and fittings in undiluted liquefied petroleum gas piping systems shall be in accordance with NFPA 58.
Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be of PVC conforming to ANSI/UL 651. PVC vent piping shall not be installed indoors.

Pipe, 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. (See Section G2417.1.2.)

Where in contact with material or atmosphere exerting a corrosive action, metallic piping and fittings coated with a corrosion-resistant material shall be used. External or internal coatings or linings used on piping or components shall not be considered as adding strength.
Metallic pipe and fitting threads shall be taper pipe threads and shall comply with ASME B1.20.1.
Pipe with threads that are stripped, chipped, corroded or otherwise damaged shall not be used. Where a weld opens during the operation of cutting or threading, that portion of the pipe shall not be used.

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

TABLE G2414.9.2 (403.9.2)

SPECIFICATIONS FOR THREADING METALLIC PIPE

IRON PIPE SIZE
(inches)
APPROXIMATE LENGTH
OF THREADED PORTION
(inches)
APPROXIMATE NO.
OF THREADS TO BE
CUT
1/23/410
3/43/410
17/810
11/4111
11/2111

For SI: 1 inch = 25.4 mm.

Thread joint compounds shall be resistant to the action of liquefied petroleum gas or to any other chemical constituents of the gases to be conducted through the piping.
The type of piping joint used shall be suitable for the pressure-temperature conditions and shall be selected giving consideration to joint tightness and mechanical strength under the service conditions. The joint shall be able to sustain the maximum end force caused by the internal pressure and any additional forces caused by temperature expansion or contraction, vibration, fatigue, or to the weight of the pipe and its contents.
Schedule 40 and heavier pipe joints shall be threaded, flanged, brazed, welded or assembled with press-connect fittings listed in accordance with ANSI LC4/CSA 6.32. Pipe lighter than Schedule 40 shall be connected using press-connect fittings, flanges, brazing or welding. Where nonferrous pipe is brazed, the brazing materials shall have a melting point in excess of 1,000°F (538°C). Brazing alloys shall not contain more than 0.05-percent phosphorus.
Copper tubing joints shall be assembled with approved gas tubing fittings, shall be brazed with a material having a melting point in excess of 1,000°F (538°C) or assembled with press-connect fittings listed in accordance with ANSI LC4/CSA 6.32. Brazing alloys shall not contain more than 0.05-percent phosphorus.
Stainless steel tubing joints shall be welded, assembled with approved tubing fittings, brazed with a material having a melting point in excess of 1,000°F (538°C), or assembled with press-connect fittings listed in accordance with ANSI LC4/CSA 6.32.
Flared joints shall be used only in systems constructed from nonferrous pipe and tubing where experience or tests have demonstrated that the joint is suitable for the conditions and where provisions are made in the design to prevent separation of the joints.

Metallic fittings shall comply with the following:

  1. Fittings used with steel, stainless steel or wrought-iron pipe shall be steel, stainless steel, copper alloy, malleable iron or cast iron.
  2. Fittings used with copper or copper alloy pipe shall be copper or copper alloy.
  3. Cast-iron bushings shall be prohibited.
  4. Special fittings. Fittings such as couplings, proprietary-type joints, saddle tees, gland-type compression fittings, and flared, flareless and compression-type tubing fittings shall be: used within the fitting manufacturer's pressure-temperature recommendations; used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion and contraction; and shall be approved.
  5. Where pipe fittings are drilled and tapped in the field, the operation shall be in accordance with all of the following:

    1. 5.1. The operation shall be performed on systems having operating pressures of 5 psi (34.5 kPa) or less.
    2. 5.2. The operation shall be performed by the gas supplier or the gas supplier's designated representative.
    3. 5.3. The drilling and tapping operation shall be performed in accordance with written procedures prepared by the gas supplier.
    4. 5.4. The fittings shall be located outdoors.
    5. 5.5. The tapped fitting assembly shall be inspected and proven to be free of leakage.

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

  1. The joints shall be designed and installed so that the longitudinal pull-out resistance of the joint will be greater than or equal to the tensile strength of the plastic piping material.
  2. Heat-fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gas-tight joints as strong as or stronger than 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."
  3. Where compression-type mechanical joints are used, the gasket material in the fitting shall be compatible with the plastic piping and with the gas distributed by the system. An internal tubular rigid stiffener shall be used in conjunction with the fitting. The stiffener shall be flush with the end of the pipe or tubing and shall extend to or beyond the outside end of the compression fitting when installed. The stiffener shall be free of rough or sharp edges and shall not be a force-fit in the plastic. Split tubular stiffeners shall not be used.
  4. Plastic piping joints and fittings for use in liquefied petroleum gas piping systems shall be in accordance with NFPA 58.
Materials used shall be installed in strict accordance with the standards under which the materials are accepted and approved. In the absence of such installation procedures, the manufacturer's instructions shall be followed. Where the requirements of referenced standards or manufacturer's instructions do not conform to minimum provisions of this code, the provisions of this code shall apply.
CSST piping systems shall be installed in accordance with the terms of their approval, the conditions of listing, the manufacturer's instructions and this code.
Piping shall not be installed in or through a ducted supply, return or exhaust, or a clothes chute, chimney or gas vent, dumbwaiter or elevator shaft. Piping installed downstream of the point of delivery shall not extend through any townhouse unit other than the unit served by such piping.
Concealed piping shall not be located in solid partitions and solid walls, unless installed in a chase or casing.

Fittings installed in concealed locations shall be limited to the following types:

  1. Threaded elbows, tees and couplings.
  2. Brazed fittings.
  3. Welded fittings.
  4. Fittings listed to ANSI LC1/CSA 6.26 or ANSI LC4/CSA 6.32.
Gas piping shall not penetrate building foundation walls at any point below grade. Gas piping shall enter and exit a building at a point above grade and the annular space between the pipe and the wall shall be sealed.

Where piping will be concealed within light-frame construction assemblies, the piping shall be protected against penetration by fasteners in accordance with Sections G2415.7.1 through G2415.7.3.

Exception: Black steel piping and galvanized steel piping shall not be required to be protected.

Where piping is installed through holes or notches in framing members and the piping is located less than 11/2 inches (38 mm) from the framing member face to which wall, ceiling or floor membranes will be attached, the pipe shall be protected by shield plates that cover the width of the pipe and the framing member and that extend not less than 4 inches (102 mm) to each side of the framing member. Where the framing member that the piping passes through is a bottom plate, bottom track, top plate or top track, the shield plates shall cover the framing member and extend not less than 4 inches (102 mm) above the bottom framing member and not less than 4 inches (102 mm) below the top framing member.
Where the piping is located within a framing member and is less than 11/2 inches (38 mm) from the framing member face to which wall, ceiling or floor membranes will be attached, the piping shall be protected by shield plates that cover the width and length of the piping. Where the piping is located outside of a framing member and is located less than 11/2 inches (38 mm) from the nearest edge of the face of the framing member to which the membrane will be attached, the piping shall be protected by shield plates that cover the width and length of the piping.
Shield plates shall be of steel material having a thickness of not less than 0.0575 inch (1.463 mm) (No. 16 gage).
Piping in solid floors shall be laid in channels in the floor and covered in a manner that will allow access to the piping with a minimum amount of damage to the building. Where such piping is subject to exposure to excessive moisture or corrosive substances, the piping shall be protected in an approved manner. As an alternative to installation in channels, the piping shall be installed in a conduit of Schedule 40 steel, wrought iron, PVC or ABS pipe in accordance with Section G2415.8.1 or G2415.8.2.
The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. If the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.
Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.
Piping installed outdoors shall be elevated not less than 31/2 inches (89 mm) above ground and where installed across roof surfaces, shall be elevated not less than 31/2 inches (89 mm) above the roof surface. Piping installed above ground, outdoors, and installed across the surface of roofs shall be securely supported and located where it will be protected from physical damage. Where passing through an outside wall, the piping shall be protected against corrosion by coating or wrapping with an inert material. Where piping is encased in a protective pipe sleeve, the annular space between the piping and the sleeve shall be sealed.
Metallic piping and metallic tubing that conveys fuel gas from an LP-gas storage container shall be provided with an approved dielectric fitting to electrically isolate the underground portion of the pipe or tube from the above-ground portion that enters a building. Such dielectric fitting shall be installed above ground, outdoors.
Steel pipe or tubing exposed to corrosive action, such as soil condition or moisture, shall be protected in accordance with Sections G2415.11.1 through G2415.11.5.
Zinc coating shall not be deemed adequate protection for underground gas piping.

Underground piping shall comply with one or more of the following:

  1. The piping shall be made of corrosion-resistant material that is suitable for the environment in which it will be installed.
  2. Pipe shall have a factory-applied, electrically-insulating coating. Fittings and joints between sections of coated pipe shall be coated in accordance with the coating manufacturer's instructions.
  3. The piping shall have a cathodic protection system installed and the system shall be monitored and maintained in accordance with an approved program.
Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used.
Steel risers connected to plastic piping shall be cathodically protected by means of a welded anode, except where such risers are anodeless risers.
Uncoated threaded or socket-welded joints shall not be used in piping in contact with soil or where internal or external crevice corrosion is known to occur.
Underground piping systems shall be installed a minimum depth of 12 inches (305 mm) below grade, except as provided for in Section G2415.12.1.
Individual lines to outdoor lights, grills and other appliances shall be installed not less than 8 inches (203 mm) below finished grade, provided that such installation is approved and is installed in locations not susceptible to physical damage.
The trench shall be graded so that the pipe has a firm, substantially continuous bearing on the bottom of the trench.
Piping installed underground beneath buildings is prohibited except where the piping is encased in a conduit of wrought iron, plastic pipe, steel pipe, a piping or encasement system listed for installation beneath buildings, or other approved conduit material designed to withstand the superimposed loads. The conduit shall be protected from corrosion in accordance with Section G2415.11 and shall be installed in accordance with Section G2415.14.1 or G2415.14.2.
The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. Where the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.
Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.

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

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

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

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

The installation of plastic pipe shall comply with Sections G2415.17.1 through G2415.17.3.

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

Exceptions:

  1. Plastic pipe shall be permitted to terminate above ground outside of buildings where installed in premanufactured anodeless risers or service head adapter risers that are installed in accordance with the manufacturer's instructions.
  2. Plastic pipe shall be permitted to terminate with a wall head adapter within buildings where the plastic pipe is inserted in a piping material for fuel gas use in buildings.
  3. Plastic pipe shall be permitted under outdoor patio, walkway and driveway slabs provided that the burial depth complies with Section G2415.12.
Connections made outdoors and underground between metallic and plastic piping shall be made only with transition fittings conforming to ASTM D2513 Category I or ASTM F1973.
A yellow-insulated copper tracer wire or other approved conductor, or a product specifically designed for that purpose, shall be installed adjacent to underground nonmetallic piping. Access shall be provided to the tracer wire or the tracer wire shall terminate above ground at each end of the nonmetallic piping. The tracer wire size shall be not less than 18 AWG and the insulation type shall be suitable for direct burial.
The use of a flammable or combustible gas to clean or remove debris from a piping system shall be prohibited.

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

Exceptions:

  1. Approved gas filters.
  2. An approved fitting or device where the gas piping system has been sized to accommodate the pressure drop of the fitting or device.
Before any system of piping is put in service or concealed, it shall be tested to ensure that it is gas tight. Testing, inspection and purging of piping systems shall comply with Section G2417.
Changes in direction of pipe shall be permitted to be made by the use of fittings, factory bends or field bends.

Metallic pipe bends shall comply with the following:

  1. Bends shall be made only with bending tools and procedures intended for that purpose.
  2. Bends shall be smooth and free from buckling, cracks or other evidence of mechanical damage.
  3. The longitudinal weld of the pipe shall be near the neutral axis of the bend.
  4. Pipe shall not be bent through an arc of more than 90 degrees (1.6 rad).
  5. The inside radius of a bend shall be not less than six times the outside diameter of the pipe.

Plastic pipe bends shall comply with the following:

  1. The pipe shall not be damaged and the internal diameter of the pipe shall not be effectively reduced.
  2. Joints shall not be located in pipe bends.
  3. The radius of the inner curve of such bends shall be not less than 25 times the inside diameter of the pipe.
  4. Where the piping manufacturer specifies the use of special bending tools or procedures, such tools or procedures shall be used.
Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested to determine that the materials, design, fabrication and installation practices comply with the requirements of this code.
Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly or pressure tests.

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

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

Where new branches are installed to new appliances, only the newly installed branches shall be required to be pressure tested. Connections between the new piping and the existing piping shall be tested with a noncorrosive leak-detecting fluid or other approved leak-detecting methods.
A piping system shall be permitted to be tested as a complete unit or in sections. A valve in a line shall not be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, except where 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 test pressure.
Regulator and valve assemblies fabricated independently of the piping system in which they are to be installed shall be permitted to be tested with inert gas or air at the time of fabrication.
Prior to testing, the interior of the pipe shall be cleared of all foreign material.
The test medium shall be air, nitrogen, carbon dioxide or an inert gas. Oxygen shall not be used as a test medium.

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

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

Expansion joints shall be provided with temporary restraints, if required, for the additional thrust load under test.
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.
Where the piping system is connected to appliances or equipment designed for operating pressures of less than the test pressure, such appliances or equipment shall be isolated from the piping system by disconnecting them and capping the outlet(s).
Where the piping system is connected to appliances or equipment designed for operating pressures equal to or greater than the test pressure, such appliances or equipment shall be isolated from the piping system by closing the individual appliance or equipment shutoff valve(s).
Testing of piping systems shall be performed in a manner that protects the safety of employees and the public during the test.
Test pressure shall be measured with a manometer or with a pressure-measuring device designed and calibrated to read, record, or indicate a pressure loss caused by leakage during the pressure test period. The source of pressure shall be isolated before the pressure tests are made. Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than five times the test pressure.
The test pressure to be used shall be not less than 11/2 times the proposed maximum working pressure, but not less than 3 psig (20 kPa gauge), irrespective of design pressure. Where the test pressure exceeds 125 psig (862 kPa gauge), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.
The test duration shall be not less than 10 minutes.