CHAPTER 12

FUEL PIPING

167

1201.0 Scope of Gas Piping.

(A) Coverage of piping systems shall extend fromthe point of delivery to the connections witheach gas utilization device. For other than undi-luted liquefied petroleum gas systems, the pointof delivery shall be considered the outlet of theservice meter assembly, or the outlet of theservice regulator or service shutoff valve whereno meter is provided. For undiluted liquefiedpetroleum gas systems, the point of deliveryshall be considered the outlet of the final pres-sure regulator, exclusive of the line gas regulators,in the system. [NFPA 54:1.1.1.1(A)]

(B) Piping systems requirements shall includedesign, materials, components, fabrications,assembly, installation, testing, inspection, opera-tion, and maintenance. [NFPA 54:1.1.1.1(C)]

(C) This code shall not apply to the following (refer-ence standards for some of which appear inChapter 14): [NFPA 54:1.1.1.2]

(1) Portable LP-Gas appliances of all types thatare not connected to a fixed fuel pipingsystem. [NFPA 54:1.1.1.2(1)]

(2) Installation of farm equipment such asbrooders, dehydrators, dryers, and irriga-tion equipment. [NFPA 54:1.1.1.2(2)]

(3) Raw material (feedstock) applications,except for piping to special atmospheregenerators. [NFPA 54:1.1.1.2(3)]

(4) Oxygen-fuel gas cutting and weldingsystems. [NFPA 54:1.1.1.2(4)]

(5) Industrial gas applications using gases suchas acetylene and acetylenic compounds,hydrogen, ammonia, carbon monoxide,oxygen, and nitrogen. [NFPA 54:1.1.1.2(5)]

(6) Petroleum refineries, pipeline compressor orpumping stations, loading terminals,compounding plants, refinery tank farms,and natural gas processing plants. [NFPA54:1.1.1.2(6)]

(7) Large integrated chemical plants or portionsof such plants where flammable orcombustible liquids or gases are producedby chemical reactions or used in chemicalreactions. [NFPA 54:1.1.1.2(7)]

(8) LP-Gas installations at utility gas plants.[NFPA 54:1.1.1.2(8)]

(9) Liquefied natural gas (LNG) installations.[NFPA 54:1.1.1.2(9)]

(10) Fuel gas piping in electric utility powerplants. [NFPA 54-09:1.1.1.2(10)]

(11) Proprietary items of equipment, apparatus,or instruments such as gas-generating sets,compressors, and calorimeters. [NFPA54:1.1.1.2(11)]

(12) LP-Gas appliances for vaporization, gasmixing, and gas manufacturing. [NFPA54:1.1.1.2(12)]

(13) LP-Gas piping for buildings under construc-tion or renovations that are not to becomepart of the permanent building pipingsystem—that is, temporary fixed piping forbuilding heat. [NFPA 54:1.1.1.2(13)]

(14) Installation of LP-Gas systems for railroadswitch heating. [NFPA 54:1.1.1.2(14)]

(15) Installation of LP-Gas and compressednatural gas systems on vehicles. [NFPA54:1.1.1.2(15)]

(16) Gas piping, meters, gas-pressure regulators,and other appurtenances used by the servinggas supplier in distribution of gas, other thanundiluted LP-Gas. [NFPA 54:1.1.1.2(16)]

1202.0 General.

The regulations of this chapter shall govern theinstallation of fuel gas piping in or in connectionwith any building, structure or within the propertylines of any premises up to five (5) psi (34.5 kPa),other than service pipe. Fuel oil piping systems shallbe installed in accordance with NFPA 31.

1203.0 Definitions.

For the purposes of this code, these definitions shallapply to this chapter. Certain terms, phrases, words,and their derivatives shall be interpreted as set forthin this section, provided, however, that whenever thewords “gas meters” appear, they shall be construedto also mean valves and those devices required forthe regulation of pressure and the measurement ofnatural gas being dispensed for any building, struc-ture, or premises.

1203.1 Appliance Fuel Connector – An assemblyof listed semi-rigid or flexible tubing and fittings tocarry fuel between a fuel-piping outlet and a fuel-burning appliance.

1203.2 Bonding Jumper – A reliable conductor toensure the required electrical conductivity betweenmetal parts required to be electrically connected.[NFPA 70:100.1]

1203.3 Fuel Gas – Natural, manufactured, liquefiedpetroleum, or a mixture of these.

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1203.4 – 1206.1 IDAHO STATE PLUMBING CODE

1203.4 Gas Piping – Any installation of pipe,valves, or fittings that is used to convey fuel gas,installed on any premises or in any building, butshall not include:

(1) Any portion of the service piping.

(2) Any approved piping connection six (6) feet(1,829 mm) or less in length between an existinggas outlet and a gas appliance in the same roomwith the outlet.

1203.5 Gas-Piping System – Any arrangement ofgas piping or regulators after the point of deliveryand each arrangement of gas piping serving abuilding, structure, or premises, whether individu-ally metered or not.

1203.6 Grounding Electrode – A device that estab-lishes an electrical connection to the earth.

1203.7 Liquefied Petroleum Gas (LPG) Facilities –Liquefied petroleum gas (LPG) facilities meanstanks, containers, container valves, regulating equip-ment, meters, and/or appurtenances for the storageand supply of liquefied petroleum gas for anybuilding, structure, or premises.

1203.8 Provision for Location of Point of Delivery –

The location of the point of delivery shall be accept-able to the serving gas supplier. [NFPA 54:5.2]

1203.9 Quick-Disconnect Device – A hand-oper-ated device that provides a means for connectingand disconnecting an appliance or an applianceconnector to a gas supply and that is equipped withan automatic means to shut off the gas supply whenthe device is disconnected. [NFPA 54:3.3.28.3]

1203.10 Service Piping – The piping and equip-ment between the street gas main and the gas pipingsystem inlet that is installed by, and is under thecontrol and maintenance of, the serving gas supplier.

1203.11 Transition Gas Riser – Any listed orapproved section or sections of pipe and fittingsused to convey fuel gas and installed in a gas pipingsystem for the purpose of providing a transitionfrom below ground to above ground.

1204.0 Inspection.

1204.1 Upon completion of the installation, alter-ation, or repair of any gas piping, and prior to theuse thereof, the Authority Having Jurisdiction shallbe notified that such gas piping is ready for inspec-tion.

1204.2 All excavations required for the installationof underground piping shall be kept open until suchtime as the piping has been inspected and approved.If any such piping is covered or concealed beforesuch approval, it shall be exposed upon the directionof the Authority Having Jurisdiction.

1204.3 The Authority Having Jurisdiction shallmake the following inspections and either shallapprove that portion of the work as completed orshall notify the permit holder wherein the same failsto comply with this code.

1204.3.1 Rough Piping Inspection. Thisinspection shall be made after all gas pipingauthorized by the permit has been installed andbefore any such piping has been covered orconcealed or any fixture or appliance has beenattached thereto. This inspection shall include adetermination that the gas-piping size, material,and installation meet the requirements of thiscode.

1204.3.2 Final Piping Inspection. This inspec-tion shall be made after all piping authorized bythe permit has been installed and after allportions thereof that are to be covered orconcealed are so concealed and before anyfixtures, appliance, or shutoff valve has beenattached thereto. This inspection shall be inaccordance with Section 1214.1. Test gaugesused in conducting tests shall comply withSection 319.0, Test Gauges.

1204.4 In cases where the work authorized by thepermit consists of a minor installation of additionalpiping to piping already connected to a gas meter,the foregoing inspections shall be permitted to bewaived at the discretion of the Authority HavingJurisdiction. In this event, the Authority HavingJurisdiction shall make such inspection as deemedadvisable in order to be assured that the work hasbeen performed in accordance with the intent of thiscode.

1205.0 Certificate of Inspection.

1205.1 If, upon final piping inspection, the installa-tion is found to comply with the provisions of thiscode, a certificate of inspection shall be permitted tobe issued by the Authority Having Jurisdiction.

1205.2 A copy of the certificate of such final pipinginspection shall be issued to the serving gas suppliersupplying gas to the premises.

1205.3 It shall be unlawful for any serving gassupplier, or person furnishing gas, to turn on orcause to be turned on, any fuel gas or any gas meteror meters, until such certificate of final inspection, asherein provided, has been issued.

1206.0 Authority to Render Gas Service.

1206.1 It shall be unlawful for any person, firm, orcorporation, excepting an authorized agent or

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FUEL PIPING 1206.1 – 1209.4

employee of a person, firm, or corporation engagedin the business of furnishing or supplying gas andwhose service pipes supply or connect with theparticular premises, to turn on or reconnect gasservice in or on any premises where and when gasservice is, at the time, not being rendered.

1206.2 It shall be unlawful to turn on or connect gasin or on any premises unless all outlets are properlyand securely connected to gas appliances or cappedor plugged with screw joint fittings.

1207.0 Authority to Disconnect.

1207.1 The Authority Having Jurisdiction or theserving gas supplier is hereby authorized to discon-nect any gas piping or appliance or both that shall befound not to conform to the requirements of thiscode or that are found defective and in such condi-tion as to endanger life or property.

1207.2 Where such disconnection has been made, anotice shall be attached to such gas piping or appli-ance or both that shall state the same has beendisconnected, together with the reasons thereof.

1207.3 It shall be unlawful to remove or disconnectany gas piping or gas appliance without capping orplugging with a screw joint fitting, the outlet fromwhich said pipe or appliance was removed. Outletsto which gas appliances are not connected shall beleft capped, gas-tight on any piping system that hasbeen installed, altered, or repaired.

Exception: When an approved listed quick-disconnect device is used.

1208.0 Temporary Use of Gas.

Where temporary use of gas is desired and theAuthority Having Jurisdiction deems the use neces-sary, a permit shall be permitted to be issued forsuch use for a period of time not to exceed thatdesignated by the Authority Having Jurisdiction,provided that such gas-piping system otherwiseconforms to the requirements of this code regardingmaterial, sizing, and safety.

1209.0 Gas-Piping System Design, Materials, and

Components.

1209.1 Piping Plan.

1209.1.1 Installation of Piping System. Whererequired by the Authority Having Jurisdiction, apiping sketch or plan shall be prepared beforeproceeding with the installation. This plan shallshow the proposed location of piping, the size of

different branches, the various load demands,and the location of the point of delivery. [NFPA54:5.1.1]

1209.1.2 Addition to Existing System. Whenan additional gas utilization appliance is beingconnected to a gas-piping system, the existingpiping shall be checked to determine whether ithas adequate capacity (see Section 1209.4.3). Ifinadequate, the existing system shall be enlargedas required, or separate gas piping of adequatecapacity shall be provided. [NFPA 54:5.1.2]

1209.2 Provision for Location of Point of Delivery.

The location of the point of delivery shall be accept-able to the serving gas supplier. [NFPA 54:5.2]

1209.3 Interconnections Between Gas-Piping

Systems.

1209.3.1 Interconnections Supplying Sepa-

rate Users. Where two (2) or more meters, ortwo (2) or more service regulators where metersare not provided, are located on the samepremises and supply separate users, the gas-piping systems shall not be interconnected onthe outlet side of the meters or service regula-tors. [NFPA 54:5.3.1]

1209.3.2 Interconnections for Standby Fuels.

Where a supplementary gas for standby use isconnected downstream from a meter or a serviceregulator where a meter is not provided, adevice to prevent backflow shall be installed. Athree-way valve installed to admit the standbysupply and, at the same time, shut off theregular supply, shall be permitted to be used forthis purpose. [NFPA 54:5.3.2]

1209.4 Sizing of Gas-Piping Systems.

1209.4.1 General Considerations. Gas-pipingsystems shall be of such size and so installed asto provide a supply of gas sufficient to meet themaximum demand and supply gas to eachappliance inlet at not less than the minimumsupply pressure required by the appliance.[NFPA 54-09:5.4.1]

1209.4.2 Maximum Gas Demand. The volumeof gas to be provided (in cubic feet per hour)shall be determined directly from the manufac-turer's input ratings of the gas utilization appli-ance served. Where the input rating is not indi-cated, the gas supplier, appliance manufacturer,or a qualified agency shall be contacted or therating from Table 12-1 shall be used for esti-mating the volume of gas to be supplied. Thetotal connected hourly load shall be used as thebasis for piping sizing, assuming the appliance isoperating at full capacity simultaneously.

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1209.4 – Table 12-1 IDAHO STATE PLUMBING CODE

Exception: Sizing shall be permitted to bebased upon established load diversityfactors. [NFPA 54:5.4.2]

1209.4.3 Sizing Methods. Gas piping shall besized in accordance with one of the following :

(1) Pipe sizing tables or sizing equations in thischapter.

(2) Other approved engineering methods accept-able to the Authority Having Jurisdiction.

(3) Sizing tables included in a listed pipingsystem manufacturer's installation instruc-tions. [NFPA 54:5.4.3]

1209.4.4 Allowable Pressure Drop. The designpressure loss in any piping system undermaximum probable flow conditions, from thepoint of delivery to the inlet connection of theappliance, shall be such that the supply pressureat the appliance exceeds or is equal to theminimum pressure required by the appliance.[NFPA 54-09:5.4.4]

1209.5 Acceptable Piping Materials and Joining

Methods.

1209.5.1 General.

1209.5.1.1 Acceptable Materials. Materialsused for piping systems shall comply withthe requirements of this chapter or shall beacceptable to the Authority Having Jurisdic-tion. [NFPA 54:5.6.1.1]

1209.5.1.2 Used Materials. Pipe, fittings,valves, or other materials shall not be usedagain unless they are free of foreign mate-rials and have been ascertained to beadequate for the service intended. [NFPA54:5.6.1.2]

1209.5.1.3 Other Materials. Material notcovered by the standards specifications listedherein shall be investigated and tested todetermine that it is safe and suitable for theproposed service and, in addition, shall berecommended for that service by the manufac-turer and shall be acceptable to the AuthorityHaving Jurisdiction. [NFPA 54:5.6.1.3]

1209.5.2 Metallic Pipe.

1209.5.2.1 Cast-iron pipe shall not be used.[NFPA 54:5.6.2.1]

1209.5.2.2 Steel and wrought-iron pipeshall be not less than standard weight(Schedule 40) and shall comply with one ofthe following standards:

(1) ASME B36.10, Welded and SeamlessWrought-Steel Pipe

TABLE 12-1

Approximate Gas Input for Typical Appliances

[NFPA 54: Table 5.4.2.1]

ApplianceInput Btu/h.

(Approx.)

Space Heating Units

Warm air furnace

Single family

Multifamily, per unit

Hydronic boiler

Single family

Multifamily, per unit

Space-and Water-Heating Units

Hydronic boiler

Single family

Multifamily, per unit

Water-Heating Appliances

Water heater, automatic

storage 30 to 40 gal. tank

Water heater, automatic

storage 50 gal. tank

Water heater, automatic instantaneous

Capacity at 2 gal./minute

Capacity at 4 gal./minute

Capacity at 6 gal./minute

Water heater, domestic,

circulating or side-arm

Cooking Appliances

Range, freestanding,

domestic

Built-in oven or broiler unit,

domestic

Built-in top unit,

domestic

Other Appliances

Refrigerator

Clothes dryer, Type 1

(domestic)

Gas fireplace direct vent

Gas logBarbecue

Gaslight

100,000

60,000

100,000

60,000

120,000

75,000

35,000

50,000

142,800

285,000

428,400

35,000

65,000

25,000

40,000

3,000

35,000

40,000

80,000

40,000

2,500

For SI units: 1 Btu per hour = 0.293 W

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FUEL PIPING 1209.5

(2) ASTM A 53, Standard Specification forPipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless

(3) ASTM A 106, Standard Specification forSeamless Carbon Steel Pipe for High-Temperature Service [NFPA 54:5.6.2.2]

1209.5.2.3 Copper and brass pipe shall notbe used if the gas contains more than anaverage of 0.3 grains of hydrogen sulfide perone-hundred (100) scf of gas (0.7 mg/100 L).[NFPA 54:5.6.2.3]

Threaded copper, brass, or aluminumalloy pipe shall not be used with gasescorrosive to such material. [NFPA 54:5.6.2.4]

1209.5.2.4 Aluminum alloy pipe shallcomply with ASTM B 241, Standard Specifica-tion for Aluminum-Alloy Seamless Pipe andSeamless Extruded Tube (except that the useof alloy 5456 is prohibited) and shall bemarked at each end of each length indi-cating compliance. Aluminum alloy pipeshall be coated to protect against externalcorrosion where it is in contact withmasonry, plaster, insulation or is subject torepeated wettings by such liquids as water,detergents, or sewage. [NFPA 54:5.6.2.5]

Aluminum alloy pipe shall not be usedin exterior locations or underground. [NFPA54:5.6.2.6]

1209.5.3 Metallic Tubing. Seamless copper,aluminum alloy, or steel tubing shall not be usedwith gases corrosive to such material. [NFPA54:5.6.3]

1209.5.3.1 Steel tubing shall comply withASTM A 254, Standard Specification for Copper

Brazed Steel Tubing. [NFPA 54-09:5.6.3.1]

1209.5.3.2 Copper and brass tubing shallnot be used if the gas contains more than anaverage of 0.3 grains of hydrogen sulfide perone-hundred (100) scf of gas (0.7 mg/100 L).Copper tubing shall comply with standardType K or L of ASTM B 88, Standard Specifi-

cation for Seamless Copper Water Tube, orASTM B 280, Specification for Seamless Copper

Tube for Air-Conditioning and Refrigeration

Field Service. [NFPA 54:5.6.3.2]

1209.5.3.3 Aluminum alloy tubing shallcomply with ASTM B 210, Standard Specifica-

tion for Aluminum-Alloy Drawn Seamless

Tubes, or ASTM B 241, Standard Specification

for Aluminum Alloy Seamless Pipe and Seam-

less Extruded Tube. Aluminum alloy tubing

shall be coated to protect against externalcorrosion where it is in contact withmasonry, plaster, insulation or is subject torepeated wettings by liquids such as water,detergent, or sewage. Aluminum alloytubing shall not be used in exterior locationsor underground. [NFPA 54:5.6.3.3]

1209.5.3.4 Corrugated stainless steel tubingshall be tested and listed in compliance withthe construction, installation, and perfor-mance requirements of CSA LC-1, Standardfor Fuel Gas Piping Systems Using CorrugatedStainless Steel Tubing. [NFPA 54:5.6.3.4]

1209.5.4 Plastic Pipe, Tubing, and Fittings.

Plastic pipe, tubing, and fittings used to supplyfuel gas shall conform with ASTM D 2513, Stan-dard Specification for Thermoplastic Gas PressurePipe, Tubing, and Fittings. Pipe to be used shall bemarked "gas" and "ASTM D 2513.” [NFPA54:5.6.4.1]

Anodeless risers shall comply with thefollowing [NFPA 54:5.6.4.3]:

1209.5.4.1 Regulator Vent Piping. Plasticpipe, tubing, and fittings used to connectregulator vents to remote vent terminationsshall be PVC conforming to UL 651, Schedule40 and 80 Rigid PVC Conduit and Fittings.PVC vent piping shall not be installedindoors. [NFPA 54-09:5.6.4.2]

1209.5.4.2 Factory-assembled anodelessrisers shall be recommended by the manu-facturer for the gas used and shall be leak-tested by the manufacturer in accordancewith written procedures. [NFPA 54:5.6.4.3(1)]

1209.5.4.3 Service head adapters and field-assembled anodeless risers incorporatingservice head adapters shall be recom-mended by the manufacturer for the gasused by the manufacturer and shall bedesign-certified to meet the requirements ofCategory I of ASTM D 2513, Standard Specifi-cation for Thermostatic Gas Pressure Pipe,Tubing, and Fittings and the code of FederalRegulations, Title 49, Part 192.281(e). Themanufacturer shall provide the user withqualified installation instructions asprescribed by the code of Federal Regula-tions, Title 49, Part 192.283(b). [NFPA54:5.6.4.3(2)]

1209.5.4.4 The use of plastic pipe, tubing,and fittings in undiluted liquefied petroleumgas-piping systems shall be in accordancewith NFPA 58, Liquefied Petroleum Gas Code.[NFPA 54:5.6.4.3(3)]

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1209.5.5 Workmanship and Defects. Gas pipeor tubing and fittings shall be clear and free fromcutting burrs and defects in structure orthreading, and shall be thoroughly brushed andchip and scale blown. Defects in pipe, tubing,and fittings shall not be repaired. Defective pipe,tubing, and fittings shall be replaced. [NFPA54:5.6.5]

1209.5.6 Protective Coating. Where in contactwith material or atmosphere exerting a corrosiveaction, metallic piping and fittings coated with acorrosion-resistant material shall be used.External or internal coatings or linings used onpiping or components shall not be considered asadding strength. [NFPA 54:5.6.6]

1209.5.7 Metallic Pipe Threads.

(A) Specifications for Pipe Threads. Metallicpipe and fitting threads shall be taper pipethreads and shall comply with ASMEB1.20.1, Standard for Pipe Threads, General

Purpose (Inch). [NFPA 54:5.6.7.1]

(B) Damaged Threads. Pipe with threads thatare stripped, chipped, corroded, or other-wise damaged shall not be used. Where aweld opens during the operation of cuttingor threading, that portion of the pipe shallnot be used. [NFPA 54:5.6.7.2]

(C) Number of Threads. Field threading ofmetallic pipe shall be in accordance withTable 12-2. [NFPA 54:5.6.7.3]

(D) Thread Compounds. Thread (joint)compounds (pipe dope) shall be resistant tothe action of liquefied petroleum gas or toany other chemical constituents of the gasesto be conducted through the piping. [NFPA54:5.6.7.4]

1209.5.8 Metallic Piping Joints and Fittings.

The type of piping joint used shall be suitable forthe pressure-temperature conditions and shallbe selected giving consideration to joint tight-ness and mechanical strength under the serviceconditions. The joint shall be able to sustain themaximum end force due to the internal pressureand any additional forces due to temperatureexpansion or contraction, vibration, fatigue, or tothe weight of the pipe and its contents. [NFPA54:5.6.8]

1209.5.8.1 Pipe Joints. Pipe joints shall bethreaded, flanged, brazed, or welded.Where nonferrous pipe is brazed, thebrazing materials shall have a melting pointin excess of 1,000°F (538°C). Brazing alloysshall not contain more than 0.05 percentphosphorus. [NFPA 54:5.6.8.1]

1209.5.8.2 Tubing Joints. Tubing jointsshall either be made with approved gastubing fittings, be brazed with a materialhaving a melting point in excess of 1,000°F(538°C), or made by press-connect fittingscomplying with CSA LC-4. Brazing alloysshall not contain more than 0.05 percentphosphorus. [NFPA 54:5.6.8.2]

1209.5.8.3 Flared Joints. Flared joints shallbe used only in systems constructed fromnonferrous pipe and tubing where experi-ence or tests have demonstrated that thejoint is suitable for the conditions and whereprovisions are made in the design to preventseparation of the joints. [NFPA 54:5.6.8.3]

1209.5.8.4 Metallic Fittings (Including

Valves, Strainers, Filters).

(1) Threaded fittings in sizes exceedingfour (4) inches (100 mm) shall not beused unless acceptable to the AuthorityHaving Jurisdiction.

(2) Fittings used with steel or wrought-ironpipe shall be steel, brass, bronze,malleable iron, or cast-iron.

(3) Fittings used with copper or brass pipeshall be copper, brass, or bronze.

(4) Fittings used with aluminum alloy pipeshall be of aluminum alloy.

(5) Cast-Iron Fittings.

(a) Flanges shall be permitted.

(b) Bushings shall not be used.

(c) Fittings shall not be used in systemscontaining flammable gas-airmixtures.

TABLE 12-2Specifications for Threading Metallic Pipe

[NFPA 54: Table 5.6.7.3]

Iron Pipe

Size (in.)

Approximate Length of

Threaded Portion (in.)

Approximate No. of

Threads to Be Cut

1/2 3/4 10

3/4 3/4 10

1 7/8 10

1-1/4 1 11

1-1/2 1 11

2 1 11

2-1/2 1-1/2 12

3 1-1/2 12

4 1-5/8 13

For SI units, 1 in. = 25.4 mm.

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(d) Fittings in sizes four (4) inches (100mm) and larger shall not be usedindoors unless approved by theAuthority Having Jurisdiction.

(e) Fittings in sizes six (6) inches (150mm) and larger shall not be usedunless approved by the AuthorityHaving Jurisdiction.

(6) Aluminum Alloy Fittings. Threads shallnot form the joint seal.

(7) Zinc-Aluminum Alloy Fittings. Fittingsshall not be used in systems containingflammable gas-air mixtures.

(8) Special Fittings. Fittings such ascouplings; proprietary-type joints;saddle tees; gland-type compressionfittings; and flared, flareless, orcompression-type tubing fittings shallbe (1) used within the fitting manufac-turers' pressure-temperature recom-mendations; (2) used within the serviceconditions anticipated with respect tovibration, fatigue, thermal expansion, orcontraction; (3) installed or braced toprevent separation of the joint by gaspressure or external physical damage;and (4) acceptable to the AuthorityHaving Jurisdiction. [NFPA 54:5.6.8.4]

1209.5.9 Plastic Piping, Joints, and Fittings.

Plastic pipe, tubing, and fittings shall be joinedin accordance with the manufacturers' instruc-tions. The following shall be observed whenmaking such joints [NFPA 54:5.6.9]:

(A) The joint shall be designed and installed sothat the longitudinal pullout resistance ofthe joint shall be equal to the tensile strengthof the plastic piping material. [NFPA54:5.6.9(1)]

(B) Heat-fusion joints shall be made in accor-dance with AWS B2.4 Specification forWelding Procedure and Performance Qualifica-tion for Thermoplastics. Joints shall be madewith the joining method recommended bythe pipe manufacturer. Heat-fusion fittingsshall be marked "ASTM D 2513." [NFPA54:5.6.9(2)]

(C) Where compression-type mechanical jointsare used, the gasket material in the fittingshall be compatible with the plastic pipingand with the gas distributed by the system.An internal tubular rigid stiffener shall beused in conjunction with the fitting. Thestiffener shall be flush with the end of thepipe or tubing, shall extend not less than the

outside end of the pipe or tubing and shallextend not less than to the outside end of thecompression fitting when installed. Thestiffener shall be free of rough or sharpedges and shall not be a forced fit in theplastic. Split tubular stiffeners shall not beused. [NFPA 54:5.6.9(3)]

(D) Plastic piping joints and fittings for use inliquefied petroleum gas-piping systemsshall be in accordance with NFPA 58, Lique-fied Petroleum Gas Code [NFPA 54:5.6.9(4)]

1209.5.10 Flanges. Flanges shall comply withASME B16.1, Standard for Cast-Iron Pipe Flangesand Flanged Fittings; ASME B16.20, Standard forRing-Joint Gaskets and Grooves for Steel PipeFlanges; or MSS SP-6, Standard Finishes for ContactFaces of Pipe Flanges and Connecting-End Flanges ofValves and Fittings. The pressure-temperatureratings shall equal or exceed that required by theapplication. [NFPA 54:5.6.10]

(A) Flange Facings. Standard facings shall bepermitted for use under this code. Whereone-hundred and fifty (150) psi (1,090 kPa)steel flanges are bolted to Class 125 cast-ironflanges, the raised face on the steel flangeshall be removed. [NFPA 54:5.6.10.1]

(B) Lapped Flanges. Lapped flanges shall beused only above ground or in exposed loca-tions accessible for inspection. [NFPA54:5.6.10.2]

1209.5.11 Flange Gaskets. The material forgaskets shall be capable of withstanding thedesign temperature and pressure of the pipingsystem and the chemical constituents of the gasbeing conducted without change to its chemicaland physical properties. The effects of fire expo-sure to the joint shall be considered in choosingthe material. [NFPA 54:5.6.11]

(1) Acceptable materials include the following:

(a) Metal or metal-jacketed asbestos (plainor corrugated)

(b) Asbestos

(c) Aluminum "O" rings and spiral-woundmetal gaskets [NFPA 54:5.6.11.1]

(2) When a flanged joint is opened, the gasketshall be replaced. [NFPA 54:5.6.11.2]

(3) Full-face gaskets shall be used with allbronze and cast-iron flanges. [NFPA54:5.6.11.3]

1209.6 Gas Meters.

1209.6.1 Capacity. Gas meters shall be selectedfor the maximum expected pressure and permis-sible pressure drop. [NFPA 54:5.7.1]

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1209.6 – 1209.7 IDAHO STATE PLUMBING CODE

1209.6.2 Location.

(A) Gas meters shall be located in ventilatedspaces readily accessible for examination,reading, replacement, or necessary mainte-nance. [NFPA 54:5.7.2.1]

(B) Gas meters shall not be placed where theywill be subjected to damage, such as adja-cent to a driveway; under a fire escape; inpublic passages, halls, or coal bins; or wherethey will be subject to excessive corrosion orvibration. [NFPA 54:5.7.2.2]

(C) Gas meters shall not be located where theywill be subjected to extreme temperatures orsudden extreme changes in temperature.Meters shall not be located in areas wherethey are subjected to temperatures beyondthose recommended by the manufacturer.[NFPA 54:5.7.2.4]

1209.6.3 Supports. Gas meters shall besupported or connected to rigid piping so as notto exert a strain on the meters. Where flexibleconnectors are used to connect a gas meter todownstream piping at mobile homes in mobilehome parks, the meter shall be supported by apost or bracket placed in a firm footing or byother means providing equivalent support.[NFPA 54:5.7.3]

1209.6.4 Meter Protection. Meters shall beprotected against overpressure, back-pressure,and vacuum where such conditions are antici-pated. [NFPA 54:5.7.4]

1209.6.5 Identification. Gas piping at multiplemeter installations shall be marked by a metaltag or other permanent means attached by theinstalling agency, designating the building orthe part of the building being supplied. [NFPA54:5.7.5]

1209.7 Gas Pressure Regulators.

1209.7.1 Where Required. A line gas pressureregulator or gas appliance pressure regulator, asapplicable, shall be installed where the gassupply pressure exceeds that at which thebranch supply line or gas utilization appliance isdesigned to operate or varies beyond designpressure limits. [NFPA 54:5.8.1]

1209.7.2 Listing. The line gas pressure regulatorshall be listed in accordance with CSA Z21.80.[NFPA 54:5.8.2]

1209.7.3 Location. The gas pressure regulatorshall be accessible for servicing. [NFPA 54:5.8.3]

1209.7.4 Regulator Protection. Pressure regu-lators shall be protected against physicaldamage. [NFPA 54:5.8.4]

1209.7.5 Venting.

(A) Line Gas Pressure Regulators.

(1) An independent vent to the outside ofthe building, sized in accordance withthe regulator manufacturer's instructions,shall be provided where the location ofa regulator is such that a ruptureddiaphragm will cause a hazard. Wherethere is more than one (1) regulator at alocation, each regulator shall have aseparate vent to the outside or, ifapproved by the Authority HavingJurisdiction, the vent lines shall bepermitted to be manifolded in accor-dance with accepted engineering prac-tices to minimize back-pressure in theevent of diaphragm failure. (See NFPA54:5.9.7 for information on properlylocating the vent.) Materials for ventpiping shall be in accordance withSection 1209.5.

Exception: A regulator and ventlimiting means combination listedas complying with CSA Z21.80,Standard for Line Pressure Regulators,shall be permitted to be used withouta vent to the outdoors.

(2) The vent shall be designed to preventthe entry of water, insects, or otherforeign materials that could causeblockage.

(3) At locations where regulators might besubmerged during floods, a special anti-flood-type breather vent fitting shall beinstalled, or the vent line shall beextended above the height of theexpected flood waters.

(4) A regulator shall not be vented to thegas appliance flue or exhaust system.[NFPA 54:5.8.5.1]

(B) Venting of Gas Appliance Pressure Regu-

lators. Venting of gas appliance pressureregulators shall comply with the followingrequirements:

(1) Gas appliance pressure regulatorsrequiring access to the atmosphere forsuccessful operation shall be equippedwith vent piping leading outdoors or, ifthe regulator vent is an integral part ofthe appliance, into the combustionchamber adjacent to a continuous pilot,unless constructed or equipped with avent-limiting means to limit the escapeof gas from the vent opening in theevent of diaphragm failure.

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FUEL PIPING 1209.7 – 1209.11

(2) Vent-limiting means shall be employedon listed gas appliance pressure regula-tors only.

(3) In the case of vents leading outdoors,means shall be employed to preventwater from entering this piping and alsoto prevent blockage of vents by insectsand foreign matter.

(4) Under no circumstances shall a regu-lator be vented to the gas utilizationappliance flue or exhaust system.

(5) In the case of vents entering thecombustion chamber, the vent shall belocated so the escaping gas will bereadily ignited by the pilot and the heatliberated thereby will not adverselyaffect the normal operation of the safetyshutoff system. The terminus of the ventshall be securely held in a fixed positionrelative to the pilot. For manufacturedgas, the need for a flame arrester in thevent piping shall be determined.

(6) Vent lines from a gas appliance pres-sure regulator and bleed lines from adiaphragm-type valve shall not beconnected to a common manifold termi-nating in a combustion chamber.

Vent lines shall not terminate in posi-tive-pressure-type combustion cham-bers. [NFPA 54:9.1.19]

(C) Discharge of Vents.

(1) The discharge stacks, vents, or outletparts of all pressure-relieving and pres-sure-limiting devices shall be located sothat gas is safely discharged into theoutside atmosphere.

(2) Discharge stacks or vents shall bedesigned to prevent the entry of water,insects, or any other foreign materialthat could cause blockage. The dischargestack or vent line shall be not less thanthe same size as the outlet of the pres-sure-relieving device. [NFPA 54:5.9.7]

1209.7.6 Bypass Piping. Valved and regulatedbypasses shall be permitted to be placed aroundgas line pressure regulators where continuity ofservice is imperative. [NFPA 54:5.8.6]

1209.7.7 Identification. Line pressure regulatorsat multiple regulator installations shall bemarked by a metal tag or other permanentmeans designating the building or the part of thebuilding being supplied. [NFPA 54:5.8.7]

1209.8 Back-Pressure Protection.

1209.8.1 Where to Install. Protective devicesshall be installed as close to the utilization

appliance as practical, where the design ofutilization appliances connected are such thatair, oxygen, or standby gases could be forcedinto the gas supply system. [NFPA 54:5.10.1.1]Gas and air combustion mixers incorporatingdouble diaphragm "zero" or "atmosphere"governors or regulators shall require no furtherprotection unless connected directly tocompressed air or oxygen at pressures of five(5) psi (34 kPa) or more. [NFPA 54:5.10.1.2]

1209.8.2 Protective Devices. Protective devicesshall include but not be limited to the following:

(1) Check valves

(2) Three-way valves (of the type thatcompletely closes one side before starting toopen the other side)

(3) Reverse flow indicators controlling positiveshutoff valves

(4) Normally closed air-actuated positiveshutoff pressure regulators [NFPA 54:5.10.2]

1209.9 Low-Pressure Protection. A protectivedevice shall be installed between the meter and thegas utilization appliance if the operation of the appli-ance (i.e., gas compressors) is such that it couldproduce a vacuum or a dangerous reduction in gaspressure at the meter. Such devices include, but arenot limited to, mechanical, diaphragm-operated, orelectrically operated low-pressure shutoff valves.[NFPA 54:5.11]

1209.10 Shutoff Valves. Shutoff valves shall beapproved and shall be selected giving considerationto pressure drop, service involved, emergency use,and reliability of operation. Shutoff valves of size one(1) inch (25 mm) National Pipe Thread and smallershall be listed. [NFPA 54:5.12]

1209.11 Expansion and Flexibility.

1209.11.1 Design. Piping systems shall bedesigned to have sufficient flexibility to preventthermal expansion or contraction from causingexcessive stresses in the piping material, exces-sive bending or loads at joints, or undesirableforces or moments at points of connections toequipment and at anchorage or guide points.Formal calculations or model tests shall berequired only where reasonable doubt exists asto the adequate flexibility of the system. [NFPA54:5.13.1]

Flexibility shall be provided by the use ofbends, loops, offsets, or couplings of the sliptype. Provision shall be made to absorb thermalchanges by the use of expansion joints of thebellows type, or by the use of "ball" or "swivel"joints. Expansion joints of the slip type shall notbe used inside buildings or for thermal expan-

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1209.11 – 1211.1 IDAHO STATE PLUMBING CODE

sion. Where expansion joints are used, anchorsor ties of sufficient strength and rigidity shall beinstalled to provide for end forces due to fluidpressure and other causes. [NFPA 54:5.13.1.1]

Pipe alignment guides shall be used withexpansion joints according to the recommendedpractice of the joint manufacturer. [NFPA54:5.13.1.2]

1209.11.2 Special Local Conditions. Wherelocal conditions include earthquake, tornado,unstable ground, or flood hazards, specialconsideration shall be given to increasedstrength and flexibility of piping supports andconnections. [NFPA 54:5.13.2]

1210.0 Excess Flow Valve.

Where automatic excess flow gas valves are installed,they shall be listed, sized, and installed in accor-dance with the manufacturer’s instructions. [NFPA54-09:5.13]

1211.0 Gas Piping Installation.

1211.1 Piping Underground.

1211.1.1 Clearances. Underground gas pipingshall be installed with sufficient clearance fromany other underground structure to avoidcontact therewith, to allow maintenance, and toprotect against damage from proximity to otherstructures. In addition, underground plasticpiping shall be installed with sufficient clearanceor shall be insulated from any source of heat soas to prevent the heat from impairing theserviceability of the pipe. [NFPA 54:7.1.1]

1211.1.2 Protection Against Damage.

(A) Cover Requirements. Underground pipingsystems shall be installed with a minimumof eighteen (18) inches (460 mm) of cover.Where external damage to the pipe is notlikely to result, the cover shall be aminimum of twelve (12) inches (300 mm).Where a minimum of twelve (12) inches (300mm) of cover cannot be provided, the pipeshall be installed in conduit or bridged(shielded). [NFPA 54:7.1.2.1]

(B) Trenches. The trench shall be graded sothat the pipe has a firm, substantiallycontinuous bearing on the bottom of thetrench. [NFPA 54:7.1.2.2]

(C) Backfilling. Where flooding of the trench isdone to consolidate the backfill, care shall beexercised to see that the pipe is not floatedfrom its firm bearing on the trench bottom.[NFPA 54:7.1.2.3]

1211.1.3 Protection Against Corrosion. Gaspiping in contact with earth or other materialthat could corrode the piping shall be protectedagainst corrosion in an approved manner. Whendissimilar metals are joined underground, aninsulating coupling or fitting shall be used.Piping shall not be laid in contact with cinders.Uncoated threaded or socket-welded joints shallnot be used in piping in contact with soil orwhere internal or external crevice corrosion isknown to occur. [NFPA 54:7.1.3]

1211.1.4 Protection Against Freezing. Wherethe formation of hydrates or ice is known tooccur, piping shall be protected against freezing.[NFPA 54:7.1.4]

1211.1.5 Piping Through Foundation Wall.

Underground piping installed through the outerfoundation or basement wall of a building, shallbe encased in a protective sleeve or protected byan approved device or method. The spacebetween the gas piping and the building orsleeve shall be sealed to prevent entry of gas andwater. [NFPA 54:7.1.5]

1211.1.6 Piping Underground Beneath Build-ings. Where the installation of gas piping under-ground beneath buildings is unavoidable, thepiping shall be encased in an approved conduitdesigned to withstand the superimposed loads.[NFPA 54:7.1.6] The conduit shall extend into anormally usable and accessible portion of thebuilding and, at the point where the conduitterminates in the building, the space between theconduit and the gas piping shall be sealed toprevent the possible entrance of any gas leakage.Where the end sealing is of a type that will retainthe full pressure of the pipe, the conduit shall bedesigned for the same pressure as the pipe. Theconduit shall extend not less than (4) inches (100mm) outside the building, be vented above gradeto the outside, and be installed so as to prevent theentrance of water and insects. [NFPA 54:7.1.6.1]

1211.1.7 Plastic Pipe.

(A) Connection of Plastic Piping. Plastic pipeshall be installed outside, undergroundonly.

Exception No. 1: Plastic pipe shall bepermitted to terminate above groundwhere an anodeless riser is used.

Exception No. 2: Plastic pipe shall bepermitted to terminate with a wall headadapter above ground in buildings,including basements, where the plasticpipe is inserted in a piping materialpermitted for use in buildings. [NFPA54:7.1.7.1]

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FUEL PIPING 1211.1 – 1211.2

(B) Connections Between Metallic and

Plastic Piping. Connections made betweenmetallic and plastic piping shall be madeonly with fittings conforming to one of thefollowing:

(1) ASTM D2513, Standard Specification forThermoplastic Gas Pressure Pipe, Tubing,and Fittings, Category I transition fittings.

(2) ASTM F1973, Standard Specification forFactory Assembled Anodeless Risers andTransition Fittings in Polyethylene (PE)and Polyamide 11 (PA11) Fuel Gas Distri-bution Systems.

(3) ASTM F2509, Standard Specification forField-Assembled Anodeless Riser Kits forUse on Outside Diameter ControlledPolyethylene Gas Distribution Pipe andTubing. [NFPA 54-09:7.1.7.2]

(C) An electrically continuous corrosion-resis-tant tracer wire (minimum AWG 14) or tapeshall be buried with the plastic pipe to facili-tate locating. One (1) end shall be broughtabove ground at a building wall or riser.[NFPA 54:7.1.7.3]

1211.2 Installation of Piping.

1211.2.1 Piping installed above ground shall besecurely supported and located where it will beprotected from physical damage (also see1211.1.4). Where passing through an outsidewall, the piping shall also be protected againstcorrosion by coating or wrapping with an inertmaterial approved for such applications. Wherepiping is encased in a protective pipe sleeve, theannular space between the gas piping and thesleeve shall be sealed at the wall to prevent theentry of water, insects, or rodents. [NFPA54:7.2.1]

1211.2.2 Building Structure.

(1) The installation of gas piping shall not cause structural stresses within building compo-nents to exceed allowable design limits.[NFPA 54:7.2.2.1]

(2) Approval shall be obtained before anybeams or joists are cut or notched. [NFPA54:7.2.2.2] Permission shall be obtained fromthe Authority Having Jurisdiction.

1211.2.3 Other than Dry Gas. Drips, sloping,protection from freezing, and branch pipeconnections, as provided for in Section 1211.1.4,1211.8.1, and Section 1211.10, shall be providedwhen other than dry gas is distributed andclimactic conditions make such provisions neces-sary. [NFPA 54:7.2.3]

1211.2.4 Gas Piping to be Sloped. Piping forother than dry gas conditions shall be sloped notless than one-fourth (1/4) inch in fifteen (15) feet(8 mm in 4,572 mm) to prevent traps. [NFPA54:7.2.4]

1211.2.4.1 Ceiling Locations. Gas pipingshall be permitted to be installed in acces-sible spaces between a fixed ceiling and adropped ceiling, whether or not such spacesare used as a plenum. Valves shall not belocated in such spaces.

Exception: Appliance shutoff valvesrequired by this code shall be permittedto be installed in accessible spacescontaining vented gas utilization appli-ances.

1211.2.5 Prohibited Locations. Gas pipinginside any building shall not be installed in orthrough a circulating air duct, clothes chute,chimney or gas vent, ventilating duct, dumb-waiter, or elevator shaft. [NFPA 54:7.2.5] Thisprovision shall not apply to ducts used toprovide combustion and ventilation air in accor-dance with Section 507.0 or to above-ceilingspaces as covered in Section 1211.2.4.1.

1211.2.6 Hangers, Supports, and Anchors.

(A) Piping shall be supported with metal pipehooks, metal pipe straps, metal bands, metalbrackets, metal hangers, or building struc-tural components, suitable for the size ofpiping, of adequate strength and quality;and located at intervals so as to prevent ordamp out excessive vibration. Piping shallbe anchored to prevent undue strains onconnected equipment and shall not besupported by other piping. Pipe hangersand supports shall conform to the require-ments of MSS SP-58, Pipe Hangers andSupports Materials, Design and Manufacture.[NFPA 54:7.2.6.1]

(B) Spacings of supports in gas-piping installa-tions shall not exceed as shown in Table 12-3. Spacing of supports for CSST shall be inaccordance with the CSST manufacturer'sinstruction. [NFPA 54:7.2.6.2]

(C) Supports, hangers, and anchors shall beinstalled so as not to interfere with the freeexpansion and contraction of the pipingbetween anchors. All parts of the supportingequipment shall be designed and installedso they will not be disengaged by move-ment of the supported piping. [NFPA54:7.2.6.3]

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1211.2.7 Removal of Pipe. Where pipingcontaining gas is to be removed, the line shall befirst disconnected from sources of gas and thenthoroughly purged with air, water, or inert gasbefore any cutting or welding is done. (SeeSection 1214.6.) [NFPA 54:7.2.7]

1211.3 Concealed Piping in Buildings.

1211.3.1 General. Gas piping in concealed loca-tions shall be installed in accordance with thissection. [NFPA 54:7.3.1]

1211.3.2 Connections. Where gas piping is tobe concealed, unions, tubing fittings, right andleft couplings, bushings, swing joints, andcompression couplings made by combinations offittings shall not be used. Connections shall be ofthe following type:

(1) Pipe fittings such as elbows, tees, andcouplings.

(2) Joining tubing by brazing (see Section1209.5.8.2).

(3) Fittings listed for use in concealed spacesthat have been demonstrated to sustain,without leakage, any forces due to tempera-ture expansion or contraction, vibration, orfatigue based on their geographic location,application, or operation.

(4) Where necessary to insert fittings in gas pipethat has been installed in a concealed location,the pipe shall be reconnected by welding,flanges, or the use of a ground joint unionwith the nut center-punched to prevent loos-ening by vibration. [NFPA 54:7.3.2]

1211.3.3 Piping in Partitions. Concealed gaspiping shall not be located in solid partitions.[NFPA 54:7.3.3]

1211.3.4 Tubing in Partitions. This provisionshall not apply to tubing that pierces walls,floors, or partitions or to tubing installed verti-cally and horizontally inside hollow walls or

partitions without protection along its entireconcealed length where both of the followingrequirements are met:

(1) A steel striker barrier not less than 0.0508inches (1.3 mm) thick, or equivalent, isinstalled between the tubing, the finishedwall and extends at least 4 inches (100 mm)beyond concealed penetrations of plates, firestops, wall studs, and so on.

(2) The tubing is installed in single runs and isnot rigidly secured. [NFPA 54:7.3.4]

1211.3.5 Piping in Floors. In industrial occu-pancies, gas piping in solid floors such asconcrete shall be laid in channels in the floor andcovered to permit access to the piping withminimum damage to the building. Where pipingin floor channels could be exposed to excessivemoisture or corrosive substances, the pipingshall be protected in an approved manner.[NFPA 54:7.3.5.1]

Exception: In other than industrial occupan-cies and where approved by the AuthorityHaving Jurisdiction, gas piping embeddedin concrete floor slabs constructed with port-land cement shall be surrounded with aminimum of one and one half (1-1/2) inches(38 mm) of concrete and shall not be inphysical contact with other metallic struc-tures such as reinforcing rods or electricallyneutral conductors. Piping, fittings, andrisers shall be protected against corrosion inaccordance with Section 1209.5.6. Pipingshall not be embedded in concrete slabscontaining quick-set additives or cinderaggregate. [NFPA 54:7.3.5.2]

1211.4 Piping in Vertical Chases. (See Section1202.0.) Where gas piping exceeding five (5) psi (34kPa) is located within vertical chases in accordancewith Section 1211.5, the requirements of Sections1211.5.1 through 1211.5.3 shall apply. [NFPA 54:7.4]

1211.5 Maximum Design Operating Pressure. Themaximum design operating pressure for pipingsystems located inside buildings shall not exceed five(5) psi (34 kPa) unless one (1) or more of thefollowing conditions are met:

(1) The piping system is welded.

(2) The piping is located in a ventilated chase orotherwise enclosed for protection against acci-dental gas accumulation.

(3) The piping is located inside buildings or sepa-rate areas of buildings used exclusively for oneof the following:

TABLE 12-3

Support of Piping

[NFPA 54: Table 7.2.6.2]

Steel Pipe,

Nominal Size

of Pipe (in.)

Spacing of

Supports

(ft.)

Nominal Size

of Tubing

Smooth-wall

(In. O.D.)

Spacing of

Supports

(ft.)

1/2 6 1/2 4

3/4 or 1 8 5/8 or 3/4 6

1-1/4 or larger 10 7/8 or 1 8

(horizontal) (horizontal)

1-1/4 or larger every floor 1 or larger every floor

(vertical) level (vertical) level

For SI units: 1 ft. = 0.305 m.

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(a) Industrial processing or heating

(b) Research

(c) Warehousing

(d) Boiler or mechanical equipment rooms

(4) The piping is a temporary installation for build-ings under construction.

(5) The piping serves appliances or equipment usedfor agricultural purposes.

(6) The piping system is an LP-Gas piping systemwith a design operating pressure greater than 20psi and complies with NFPA 54:5.5.2. LiquefiedPetroleum Gas Systems designed to operatebelow -5ºF (-21ºC) with butane or a propane-butane mix shall be designed to either accommo-date liquid LP-Gas or to prevent LP-Gas vaporfrom condensing back into liquid. [NFPA 54-09:5.5.1]

1211.5.1 Pressure Reduction. (See Section1202.0.) Where pressure reduction is required inbranch connections for compliance with Section1211.5, such reduction shall take place eitherinside the chase or immediately adjacent to theoutside wall of the chase. Regulator venting anddownstream overpressure protection shall complywith Section 1209.7.4 and NFPA Section 5.9. Theregulator shall be accessible for service and repairand vented in accordance with one (1) of thefollowing:

(1) Where the fuel gas is lighter than air, regula-tors equipped with a vent-limiting meansshall be permitted to be vented into thechase. Regulators not equipped with a vent-limiting means shall be permitted to bevented either directly to the outdoors or to apoint within the top one (1) foot (0.3 m) of thechase.

(2) Where the fuel gas is heavier than air, theregulator vent shall be vented only directlyto the outdoors. [NFPA 54:7.4.1]

1211.5.2 Liquefied Petroleum Gas Systems.

The maximum operating pressure of LP-Gaspiping systems shall be:

(1) In accordance with Section 1211.5.1;

(2) In accordance with NFPA 58, where thepressure exceeds twenty (20) psi (138 kPa)and;

(3) Designed to either accommodate liquid LP-Gas or prevent LP-Gas vapor from condensingback into a liquid in buildings having systemsdesigned to operate below -5ºF (-21ºC) or withbutane or a propane–butane mix.

1211.5.3 Construction. Chase constructionshall comply with local building codes withrespect to fire resistance and protection of hori-zontal and vertical openings. [NFPA 54:7.4.2]

1211.5.4 Ventilation. A chase shall be ventilatedto the outdoors and only at the top. The open-ings shall have a minimum free area (in squareinches) equal to the product of one-half (1/2) ofthe maximum pressure in the piping (in psi)times the largest nominal diameter of that piping(in inches), or the cross-sectional area of thechase, whichever is smaller. Where more thanone (1) fuel gas piping system is present, the freearea for each system shall be calculated and thelargest area used. [NFPA 54:7.4.3]

1211.6 Appliance Over Pressure Protection. Themaximum operating pressure for piping systemsserving appliances designed to operate at fourteen(14) inches w.c. inlet pressure or less shall be two (2)psig unless an over-pressure protection devicedesigned to limit pressure at the appliance to two (2)psig upon failure of the line gas pressure regulator isinstalled.

1211.7 Gas Pipe Turns. Changes in direction of gaspipe shall be made by the use of fittings, or factorybends. [NFPA 54:7.5]

1211.7.1 Metallic Pipe. Metallic pipe bendsshall comply with the following:

(1) Bends shall be made only with bendingequipment and procedures intended for thatpurpose.

(2) Bends shall be smooth and free from buck-ling, cracks, or other evidence of mechanicaldamage.

(3) The longitudinal weld of the pipe shall benear the neutral axis of the bend.

(4) The pipe shall not be bent through an arc ofmore than 90 degrees.

(5) The inside radius of a bend shall be not lessthan six (6) times the outside diameter of thepipe. [NFPA 54:7.5.1]

1211.7.2 Plastic Pipe. Plastic pipe bends shallcomply with the following:

(1) The pipe shall not be damaged and theinternal diameter of the pipe shall not beeffectively reduced.

(2) Joints shall not be located in pipe bends.

(3) The radius of the inner curve of such bendsshall be not less than twenty-five (25) timesthe inside diameter of the pipe.

(4) Where the piping manufacturer specifies theuse of special bending equipment or proce-dures, such equipment or procedures shallbe used. [NFPA 54:7.5.2]

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1211.7.3 Elbows. Factory-made welding elbowsor transverse segments cut therefrom shall havean arc length measured along the crotch of atleast one (1) inch (25 mm) for pipe sizes two (2)inches and larger. [NFPA 54:7.5.3]

1211.8 Drips and Sediment Traps.

1211.8.1 Provide Drips Where Necessary. Forother than dry gas conditions, a drip shall beprovided at any point in the line of pipe wherecondensate could collect. Where required by theAuthority Having Jurisdiction or the serving gassupplier, a drip shall also be provided at theoutlet of the meter. This drip shall be so installedas to constitute a trap wherein an accumulationof condensate will shut off the flow of gas beforeit will run back into the meter. [NFPA 54:7.6.1]

1211.8.2 Location of Drips. Drips shall beinstalled only in such locations that they will bereadily accessible to permit cleaning oremptying. A drip shall not be located where thecondensate is likely to freeze. [NFPA 54:7.6.2]

1211.8.3 Sediment Traps. (See Section 1212.7.)

1211.9 Outlets.

1211.9.1 Location and Installation.

(1) The outlet fittings or piping shall be securelyfastened in place. [NFPA 54:7.7.1.1]

(2) Outlets shall not be located behind doors.[NFPA 54:7.7.1.2]

(3) Outlets shall be located far enough fromfloors, walls, patios, slabs, and ceilings topermit the use of wrenches withoutstraining, bending, or damaging the piping.[NFPA 54:7.7.1.3]

(4) The unthreaded portion of gas pipingoutlets shall extend not less than one (1)inch (25 mm) through finished ceilings orindoor or outdoor walls. [NFPA 54:7.7.1.4]

(5) The unthreaded portion of gas-pipingoutlets shall extend not less than two (2)inches (50 mm) above the surface of floorsor outdoor patios or slabs. [NFPA 54:7.7.1.5]

(6) The provisions of Sections 1211.9.1(4) and(5) shall not apply to listed quick-disconnectdevices of the flush-mounted type or listedgas convenience outlets. Such devices shallbe installed in accordance with the manufac-turer’s installation instructions. [NFPA54:7.7.1.6]

1211.9.2 Cap Outlets.

(A) Each outlet, including a valve, shall beclosed gas-tight with a threaded plug or capimmediately after installation and shall beleft closed until the gas utilization appliance

is connected thereto. When an appliance isdisconnected from an outlet and the outlet isnot to be used again immediately, it shall beclosed gas-tight.

Exception No. 1: Laboratory equipmentinstalled in accordance with 1212.2(A)shall be permitted.

Exception No. 2: The use of a listedquick-disconnect device with integralshutoff or listed gas convenience outletshall be permitted. [NFPA 54:7.7.2.1]

(B) Appliance shutoff valves installed in fire-places shall be removed and the pipingcapped gas-tight where the fireplace is usedfor solid-fuel burning. [NFPA 54:7.7.2.2]

1211.10 Branch Pipe Connection. When a branchoutlet is placed on a main supply line before it isknown what size pipe will be connected to it, theoutlet shall be of the same size as the line thatsupplies it. [NFPA 54:7.8]

1211.11 Manual Gas Shutoff Valves. (Also seeSection 1212.5)

1211.11.1 Valves at Regulators. An accessiblegas shutoff valve shall be provided upstream ofeach gas pressure regulator. Where two (2) gaspressure regulators are installed in series in asingle gas line, a manual valve shall not berequired at the second regulator. [NFPA 54:7.9.1]

1211.11.2 Valves Controlling Multiple

Systems.

(A) Accessibility of Gas Valves. Main gasshutoff valves controlling several gas pipingsystems shall be readily accessible for opera-tion and installed so as to be protected fromphysical damage. They shall be marked witha metal tag or other permanent meansattached by the installing agency so that thegas piping systems supplied through themcan be readily identified. [NFPA 54:7.9.2.1]

(B) Shutoff Valves for Multiple House Lines.

In multiple-tenant buildings suppliedthrough a master meter, or through one (1)service regulator where a meter is notprovided, or where meters or service regula-tors are not readily accessible from theequipment location, an individual shutoffvalve for each apartment or tenant line shallbe provided at a convenient point of generalaccessibility.

In a common system serving a numberof individual buildings, shutoff valves shallbe installed at each building. [NFPA54:7.9.2.2]

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FUEL PIPING 1211.11 –1212.1

1211.11.3 Emergency Shutoff Valves. An exte-rior shutoff valve to permit turning off the gassupply to each building in an emergency shall beprovided. The emergency shutoff valves shall beplainly marked as such and their locationsposted as required by the Authority HavingJurisdiction. [NFPA 54:7.9.2.3]

1211.11.4 Shutoff Valve For Laboratories.Each laboratory space containing two (2) ormore gas outlets installed on tables, benches, orin hoods in educational, research, commercialand industrial occupancies shall have a singleshutoff valve through which such gas outlets aresupplied. The shutoff valve shall be accessibleand shall be located within the laboratory orlocated adjacent to the laboratory’s egress doorand shall be identified. [NFPA 54-09:7.9.2.4]

1211.12 Prohibited Devices. No device shall beplaced inside the gas piping or fittings that willreduce the cross-sectional area or otherwise obstructthe free flow of gas, except where proper allowancein the piping system design has been made for sucha device and where approved by the AuthorityHaving Jurisdiction. [NFPA 54:7.10]

1211.13 Systems Containing Gas-Air MixturesOutside the Flammable Range. Where gas-airmixing machines are employed to produce mixturesabove or below the flammable range, they shall beprovided with stops to prevent adjustment of themixture to within or approaching the flammablerange. [NFPA 54:7.11]

1211.14 Systems Containing Flammable Gas-AirMixtures. Systems containing flammable gas-airmixtures shall be in accordance with NFPA 54.

1211.15 Electrical Bonding and Grounding.

1211.15.1 Pipe and Tubing other than CSST.Each above ground portion of a gas pipingsystem other than CSST that is likely to becomeenergized shall be electrically continuous andbonded to an effective ground-fault currentpath. Gas piping, other than CSST shall beconsidered to be bonded when it is connected toappliances that are connected to the appliancegrounding conductor of the circuit supplyingthat appliance. [NFPA 54-09:7.13.1]

1211.15.2 CSST gas piping systems shall bebonded to the electrical service grounding elec-trode system at the point where the gas serviceenters the building. The bonding jumper shall benot smaller than six (6) AWG copper wire.[NFPA 54-09:7.13.2]

1211.15.3 Gas piping shall not be used as agrounding conductor or electrode. This does notpreclude the bonding of metallic piping to agrounding system. [NFPA 54-09:7.13.3]

1211.15.4 Where a lightning protection systemis installed, the bonding of the gas piping systemshall be in accordance with NFPA 780, Standardfor Installation of Lightning Protection Systems.[NFPA 54-09:7.13.4]

1211.16 Electrical Circuits. Electrical circuits shallnot utilize gas piping or components as conductors.[NFPA 54:7.14]

Exception: Low-voltage (50V or less) controlcircuits, ignition circuits, and electronic flamedetection device circuits shall be permitted tomake use of piping or components as a part ofan electric circuit.

1211.17 Electrical Connections.

(A) Electrical connections between wiring andelectrically operated control devices in apiping system shall conform to the require-ments of NFPA 70, National Electrical Code.(See Section 1211.15) [NFPA 54:7.15.1]

(B) Any essential safety control depending onelectric current as the operating mediumshall be of a type that will shut off (fail safe)the flow of gas in the event of currentfailure. [NFPA 54:7.15.2]

1212.0 Appliance Connections to Building Piping.

1212.1 Connecting Gas Appliances. Gas utiliza-tion appliances shall be connected to the buildingpiping in compliance with Sections 1212.5 and 1212.6by one of the following [NFPA 54:9.6.1]:

(1) Rigid metallic pipe and fittings. [NFPA 54:9.6.1(1)]

(2) Semirigid metallic tubing and metallic fittings.Aluminum alloy tubing shall not be used inexterior locations. [NFPA 54:9.6.1(2)]

(3) Listed flexible gas connectors in compliance withCSA Z21.24, Standard for Connectors for Gas Appli-ances. The connector shall be used in accordancewith the terms of their listing that are completelyin the same room as the appliance. [NFPA54:9.6.1(3)]

(4) CSST where installed in accordance with themanufacturer's instructions. [NFPA 54:9.6.1(5)]

(5) Listed nonmetallic gas hose connectors in accor-dance with 1212.3. [NFPA 54:9.6.1(6)]

(6) Gas-fired food service (commercial cooking)appliances listed for use with casters or otherwisesubject to movement for cleaning, and other largeand heavy gas utilization appliances that can bemoved, shall be connected in accordance with theconnector manufacturer's installation instructionsusing a listed appliance connector complyingwith CSA Z21.69, Standard for Connectors forMovable Gas Appliances. The commercial cookingappliance connector installation shall be config-ured in accordance with the manufacturer’sinstallation instructions. [NFPA 54-09:9.6.1.1]

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1212.1 – 1212.7 IDAHO STATE PLUMBING CODE

(7) Movement of appliances with casters shall belimited by a restraining device installed in accor-dance with the connector and appliance manu-facturer's installation instructions. [NFPA 54-09:9.6.1.2]

(8) In 1212.1(2), (3), and (5), the connector or tubingshall be installed so as to be protected againstphysical and thermal damage. Aluminum alloytubing and connectors shall be coated to protectagainst external corrosion where they are incontact with masonry, plaster, insulation, or aresubject to repeated wettings by such liquids aswater (except rain water), detergents, orsewage.[NFPA 54:9.6.1(7)]

1212.2 Suspended Low-Intensity Infrared TubeHeaters. Suspended low-intensity infrared tubeheaters shall be connected to the building pipingsystem with a connector listed for the application inaccordance with CSA Z21.24/CGA 6.10, Connectorsfor Gas Appliances. [NFPA 54-09:9.6.1.3]

(A) The connector shall be installed in accordancewith the tube heater installation instructions,and shall be in the same room as the appliance.[NFPA 54-09:9.6.1.3(A)]

(B) Only one connector shall be used per appliance.[NFPA 54-09:9.6.1.3(B)]

1212.3 Use of Nonmetallic Gas Hose Connectors.Listed nonmetallic gas hose connectors shall be usedin accordance with the terms of their listing and asfollows [NFPA 54:9.6.2]:

(A) Indoor. Indoor gas hose connectors shall beused only to connect laboratory, shop, andironing equipment requiring mobility duringoperation. An equipment shutoff valve shall beinstalled where the connector is attached to thebuilding piping. The connector shall be ofminimum length and shall not exceed six (6) feet(1,829 mm). The connector shall not be concealedand shall not extend from one (1) room toanother or pass through wall partitions, ceilings,or floors. [NFPA 54:9.6.2(1)]

(B) Outdoor. Outdoor gas hose connectors arepermitted to connect portable outdoor gas-firedappliances. An appliance shutoff valve, a listedquick-disconnect device, or a listed gas conve-nience outlet shall be installed where the connectoris attached to the supply piping and in such amanner to prevent the accumulation of water orforeign matter. This connection shall be made onlyin the outdoor area where the appliance is to beused. [NFPA 54:9.6.2(2)] The connector length shallnot exceed fifteen (15) feet (4,572 mm).

1212.4 Connection of Portable and Mobile Indus-

trial Gas Appliance.

(A) Where portable industrial gas utilization appli-ances, or appliances requiring mobility or

subject to vibration, are connected to thebuilding gas piping system by the use of a flex-ible hose, the hose shall be suitable and safe forthe conditions under which it can be used.[NFPA 54:9.6.3.1]

(B) Where industrial gas utilization appliancesrequiring mobility are connected to the rigidpiping by the use of swivel joints or couplings,the swivel joints or couplings shall be suitablefor the service required, and only the minimumnumber required shall be installed. [NFPA54:9.6.3.2]

(C) Where industrial gas utilization appliancessubject to vibration are connected to the buildingpiping system by the use of all-metal flexibleconnectors, the connectors shall be suitable forthe service required. [NFPA 54:9.6.3.3]

(D) Where flexible connections are used, they shallbe of the minimum practical length and shall notextend from one (1) room to another or passthrough any walls, partitions, ceilings, or floors.Flexible connections shall not be used in anyconcealed location. They shall be protectedagainst physical or thermal damage and shall beprovided with gas shutoff valves in readilyaccessible locations in rigid piping upstreamfrom the flexible connections. [NFPA 54:9.6.3.4]

1212.5 Appliance Shutoff Valves and Connec-

tions. Gas utilization appliance connected to apiping system shall have an accessible, approvedmanual shutoff valve with a nondisplaceable valvemember, or a listed gas convenience outlet installedwithin six (6) feet (1.8 m) of the appliance it serves.Where a connector is used, the valve shall beinstalled upstream of the connector. A union orflanged connection shall be provided downstreamfrom this valve to permit removal of controls.Shutoff valves serving decorative gas appliancesshall be permitted to be installed in fireplaces iflisted for such use. [NFPA 54:9.6.4, 9.6.4.1]

1212.6 Quick-Disconnect Devices. Quick-disconnectdevices used to connect appliances to the buildingpiping shall be listed. Where they are installedindoors, an approved manual shutoff valve with anondisplaceable valve member shall be installedupstream of the quick-disconnect device. [NFPA54:9.6.5]

1212.7 Sediment Trap. Where a sediment trap isnot incorporated as a part of the gas utilization appli-ance, a sediment trap shall be installed downstreamof the appliance shutoff valve as close to the inlet ofthe appliance as practical at the time of applianceinstallation. The sediment trap shall be either a teefitting with a capped nipple in the bottom outlet, as

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FUEL PIPING 1212.7 –1214.2

illustrated in Figure 12-1, or other device recognizedas an effective sediment trap. Illuminating appli-ances, ranges, clothes dryers, decorative ventedappliances for installation in vented fireplaces, gasfireplaces, and outdoor grills shall not be required tobe so equipped. [NFPA 54-09:9.6.7]

1212.8 Installation of Piping. Piping shall beinstalled in a manner not to interfere with inspection,maintenance, or servicing of the gas utilizationequipment. [NFPA 54:9.6.8]

1213.0 Liquefied Petroleum Gas Facilities andPiping.

Liquefied petroleum gas facilities shall comply withNFPA 58, Liquefied Petroleum Gas Code.

1214.0 Pressure Testing and Inspection.

1214.1 General.

1214.1.1 Prior to acceptance and initial opera-tion, piping installations shall be inspected andpressure-tested to determine that the materials,design, fabrication, and installation practicescomply with the requirements of this code.[NFPA 54:8.1.1.1]

1214.1.2 Inspection shall consist of visual exam-ination during or after manufacture, fabrication,assembly, or pressure tests, as appropriate.Supplementary types of non-destructive inspec-tion techniques, such as magnetic-particle, radio-graphic, and ultrasonic, shall not be requiredunless specifically listed herein or in the engi-neering design. [NFPA 54:8.1.1.2]

1214.1.3 Where repairs or additions are madefollowing the pressure test, the affected pipingshall be tested. Minor repairs and additions arenot required to be pressure-tested provided thatthe work is inspected and connections are testedwith a noncorrosive leak-detecting fluid or otherleak-detecting methods approved by theAuthority Having Jurisdiction. [NFPA 54:8.1.1.3]

1214.1.4 Where new branches are installed fromthe point of delivery to new appliances, only thenewly installed branches shall be required to bepressure-tested. Connections between the newpiping and the existing piping shall be testedwith a noncorrosive leak-detecting fluid orapproved leak-detecting methods. [NFPA54:8.1.1.4]

1214.1.5 A piping system shall be tested as acomplete unit or in sections. Under no circum-stances shall a valve in a line be used as a bulk-head between gas in one (1) section of the pipingsystem and test medium in an adjacent section,unless two (2) valves are installed in series witha valved "telltale" located between these valves.A valve shall not be subjected to the test pres-sure unless it can be determined that the valve,including the valve-closing mechanism, isdesigned to safely withstand the pressure.[NFPA 54:8.1.1.5]

1214.1.6 Regulator and valve assemblies fabri-cated independently of the piping system inwhich they are to be installed shall be permittedto be tested with inert gas or air at the time offabrication. [NFPA 54:8.1.1.6]

1214.1.7 Test Medium. The test medium shallbe air, nitrogen, carbon dioxide, or an inert gas.OXYGEN SHALL NEVER BE USED. [NFPA54:8.1.2]

1214.2 Test Preparation.

1214.2.1 Pipe joints, including welds, shall beleft exposed for examination during the test.

Exception: Covered or concealed pipe endjoints that have been previously tested inaccordance with this code. [NFPA 54:8.1.3.1]

1214.2.2 Expansion joints shall be providedwith temporary restraints, if required for theadditional thrust load under test. [NFPA54:8.1.3.2]

1214.2.3 Appliances and equipment that are notto be included in the test shall be either discon-nected from the piping or isolated by blanks,blind flanges, or caps. Flanged joints at whichblinds are inserted to blank off other equipmentduring the test shall not be required to be tested.[NFPA 54:8.1.3.3]

1214.2.4 Where the piping system is connectedto appliances, equipment, or equipment compo-nents designed for operating pressures of lessthan the test pressure, such appliances, equip-ment, or equipment components shall beisolated from the piping system by discon-necting them and capping the outlets. [NFPA54:8.1.3.4]

Figure 12-1 Method of Installing a Tee Fitting

Sediment Trap. [NFPA 54: Figure 9.6.7]

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1214.2.5 Where the piping system is connectedto appliances, equipment, or equipment compo-nents designed for operating pressures equal toor exceeding the test pressure, such appliancesshall be isolated from the piping system byclosing the individual appliance or equipmentshutoff valves. [NFPA 54:8.1.3.5]

1214.2.6 Testing of piping systems shall be donewith due regard for the safety of employees andthe public during the test. Bulkheads, anchorage,and bracing suitably designed to resist test pres-sures shall be installed if necessary. Prior totesting, the interior of the pipe shall be cleared offoreign material. [NFPA 54:8.1.3.6]

1214.3 Test Pressure.

1214.3.1 Test pressure shall be measured with amanometer or with a pressure-measuring devicedesigned and calibrated to read, record, or indi-cate a pressure loss due to leakage during thepressure test period. The source of pressure shallbe isolated before the pressure tests are made.Mechanical gauges used to measure test pres-sures shall have a range such that the highestend of the scale does not exceed five (5) timesthe test pressure. [NFPA 54:8.1.4.1]

1214.3.2 The test pressure to be used shall benot less than one and one-half (1-1/2) times theproposed maximum working pressure, but notless than three (3) psi (20 kPa), irrespective ofdesign pressure. [NFPA 54:8.1.4.2]

1214.3.3 Test duration shall be not less thanone-half (1/2) hour for each five-hundred (500)cubic feet (14 m3) of pipe volume or fractionthereof. When testing a system having a volumeless than ten (10) cubic feet (0.28 m3) or a systemin a single-family dwelling, the test durationshall be not less than ten (10) minutes. The dura-tion of the test shall not be required to exceedtwenty-four (24) hours. [NFPA 54:8.1.4.3]

1214.4 Detection of Leaks and Defects.

1214.4.1 The piping system shall withstand thetest pressure specified without showing anyevidence of leakage or other defects. Any reduc-tion of test pressures as indicated by pressuregauges shall be deemed to indicate the presenceof a leak unless such reduction can be readilyattributed to some other cause. [NFPA 54:8.1.5.1]

1214.4.2 The leakage shall be located by meansof an approved gas detector, a noncorrosive leakdetection fluid, or other approved leak detectionmethods. Matches, candles, open flames, orother methods that provide a source of ignitionshall not be used. [NFPA 54:8.1.5.2]

1214.4.3 Where leakage or other defects arelocated, the affected portion of the piping systemshall be repaired or replaced and retested. [SeeSection 1214.1.3.] [NFPA 54:8.1.5.3]

1214.5 Piping Systems Leak Check.

1214.5.1 Test Gases. Leak checks using fuelgas shall be permitted in piping systems thathave been pressure-tested in accordance withSection 1214.0. [NFPA 54:8.2.1]

1214.5.2 Turning Gas On. During the processof turning gas on into a system of new gaspiping, the entire system shall be inspected todetermine that there are no open fittings or endsand that valves at unused outlets are closed andplugged or capped. [NFPA 54-09:8.2.2]

1214.5.3 Leak Check. Immediately after the gasis turned on into a new system or into a systemthat has been initially restored after an interrup-tion of service, the piping system shall bechecked for leakage. Where leakage is indicated,the gas supply shall be shut off until the neces-sary repairs have been made. [NFPA 54:8.2.3]

1214.5.4 Placing Appliance in Operation. Gasutilization appliance shall not be placed in oper-ation until after the piping system has beentested in accordance with Section 1214.5.3 andpurged in accordance with Section 1214.6.[NFPA 54:8.2.4]

1214.6 Purging Requirements. The purging ofpiping shall be in accordance with Section 1214.6.1through Section 1214.6.3. [NFPA 54-09:8.3]

1214.6.1 Piping Systems Required to bePurged Outdoors. The purging of pipingsystems shall be in accordance with Section1214.6.1.1 through Section 1214.6.1.4 where thepiping system meets either of the following:

(1) The design operating gas pressure isexceeding 2 psig (14 kPa).

(2) The piping being purged contains one ormore sections of pipe or tubing greater than2 inches (51 mm) and exceeding the lengthsin Table 12-5. [NFPA 54-09:8.3.1]

TABLE 12-5Size and Length of Piping

[NFPA 54-09: Table 8.3.1.1]

Nominal PipeSize (inches)

Length of Piping(feet)

2-1/2 > 50

3 > 30

4 > 15

6 > 10

8 or larger Any length

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

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1214.6.1.1 Removal from Service. Whereexisting gas piping is opened, the sectionthat is opened shall be isolated from the gassupply and the line pressure vented inaccordance with Section 1214.6.1.3. Wheregas piping meeting the criteria of Table 12-5is removed from service, the residual fuelgas in the piping shall be displaced with aninert gas. [NFPA 54-09:8.3.1.1]

1214.6.1.2 Placing in Operation. Wheregas piping containing air and meeting thecriteria of Table 12-5 is placed in operation,the air in the piping shall first be displacedwith an inert gas. The inert gas shall then bedisplaced with fuel gas in accordance withSection 1214.6.1.3. [NFPA 54-09:8.3.1.2]

1214.6.1.3 Outdoor Discharge of Purged

Gases. The open end of a piping systembeing pressure vented or purged shalldischarge directly to an outdoor location.Purging operations shall comply with all ofthe following requirements:

(1) The point of discharge shall becontrolled with a shutoff valve.

(2) The point of discharge shall be locatednot less than 10 feet (3048 mm) fromsources of ignition, not less than 10 feet(3048 mm) from building openings, andnot less than 25 feet (7620 mm) frommechanical air intake openings.

(3) During discharge, the open point ofdischarge shall be attended and moni-tored with a combustible gas indicatorthat is in accordance with Section1214.6.1.4.

(4) Purging operations introducing fuel gasshall be stopped where 90 percent fuelgas by volume is detected within the pipe.

(5) Persons not involved in the purgingoperations shall be evacuated fromareas within 10 feet (3048 mm) of thepoint of discharge. [NFPA 54-09:8.3.1.3]

1214.6.1.4 Combustible Gas Indicator.The combustible gas indicator used duringpurging operations shall be listed and shall becalibrated in accordance with the manufac-turer’s instructions and recommendedschedule. The combustible gas indicator usedfor pipe discharge monitoring shall numeri-cally display a volume scale from 0 percent to100 percent with a resolution of not more than1 percent increments. [NFPA 54-09:8.3.1.4]

1214.6.2 Piping Systems Allowed to BePurged Indoors or Outdoors. The purging ofpiping systems shall be in accordance with the

provisions of Section 1214.6.2.1 where the pipingsystem meets both of the following: (1) The design operating pressure is 2 psig (14

kPa) or less.(2) The piping system being purged is

constructed entirely from pipe or tubing of 2inch (50 mm) nominal size or smaller, orlarger pipe or tubing with lengths shorterthan specified in Table 12-5. [NFPA 54-09:8.3.2]1214.6.2.1 Purging Procedure. The pipingsystem shall be purged in accordance withone 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 oroutdoors through an appliance burnernot located in a combustion chamber.Such burner shall be provided with acontinuous source of ignition.

(3) The piping shall be purged with fuel gasand shall discharge to the indoors oroutdoors through a burner that has acontinuous source of ignition and that isdesigned for such purpose.

(4) The piping shall be purged with fuel gasthat is discharged to the indoors oroutdoors, and the point of dischargeshall be monitored with a listedcombustible gas detector in accordancewith Section 1214.6.2.2. Purging shall bestopped where fuel gas is detected.

(5) The piping shall be purged by the gassupplier in accordance with writtenprocedures. [NFPA 54-09:8.3.2.1]

1214.6.2.2 Combustible Gas Detector. Thecombustible gas detector used duringpurging operations shall be listed and shallbe calibrated or tested in accordance withthe manufacturer’s instructions and recom-mended schedule. The combustible gasdetector used for pipe discharge monitoringshall indicate the presence of fuel gas.[NFPA 54-09:8.3.2.2]1214.6.3 Purging Appliances and Equip-ment. After the piping system has beenplaced in operation, appliances and equip-ment shall be purged before being placedinto operation. [NFPA 54-09:8.3.3]

1215.0 Interconnections Between Gas PipingSystems.

1215.1 Interconnections Supplying SeparateUsers. Where two (2) or more meters, or two (2) ormore service regulators where meters are not

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FUEL PIPING 1214.6 – 1215.1

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provided, are located on the same premises andsupply separate users, the gas-piping systems shallnot be interconnected on the outlet side of the metersor service regulators. [NFPA 54:5.3.1]

1215.2 Interconnections for Standby Fuels.

Where supplementary gas for standby use isconnected downstream from a meter or a serviceregulator where a meter is not provided, a device toprevent backflow shall be installed. [NFPA 54:5.3.2.1]A three-way valve installed to admit the standbysupply and at the same time shut off the regularsupply shall be permitted to be used for thispurpose. [NFPA 54:5.3.2.2]

1216.0 Required Gas Supply.

1216.1 The following regulations, as set forth in thissection and in Section 1217.0, Required Gas PipingSize, shall be the standard for the installation of gaspiping. Natural gas regulations and tables are basedon the use of gas having a specific gravity of sixty-hundredths (0.60), supplied at six (6) to eight (8)inches (152–203 mm) water column pressure at theoutlet of the meter or regulator. For undiluted lique-fied petroleum gas, gas piping shall be permitted tobe sized at eleven (11) inches (279 mm) water columnpressure at the outlet of the meter or regulator andspecific gravity of one and fifty-hundredths (1.50).

Note: Where gas of a different specific gravity isto be delivered, the serving gas supplier shouldbe contacted for specific gravity conversionfactors to use in sizing piping systems from thepipe sizing tables in this chapter.

1216.2 The hourly volume of gas required at eachpiping outlet shall be taken as not less than themaximum hourly rating as specified by the manufac-turer of the appliance or appliances to be connectedto each such outlet.

1216.3 Where the gas appliances to be installed havenot been definitely specified, Table 12-1 shall bepermitted to be used as a reference to estimaterequirements of typical appliances.

To obtain the cubic feet per hour (L/sec.) of gasrequired, divide input of appliances by the averageBtu (Watt-hour) heating value per cubic foot (L) of thegas. The average Btu (Watt-hour) per cubic foot (L) ofthe gas in the area of the installation shall be permittedto be obtained from the serving gas supplier.

1216.4 The size of the supply piping outlet for anygas appliance shall not be less than one-half (1/2)inch (15 mm).

The minimum size of any piping outlet for amobile home shall be three-quarters (3/4) of an inch(20 mm).

1217.0 Required Gas Piping Size.

1217.1 Pipe Sizing Methods. Where the pipe size isto be determined using any of the methods inSections 1217.1.1 through 1217.1.3, the diameter ofeach pipe segment shall be obtained from the pipe-sizing tables in Section 1217.2 or from the sizingequations in Section 1217.3. [NFPA 54:6.1]

1217.1.1 Longest Length Method. The pipesize of each section of gas piping shall be deter-mined using the longest length of piping fromthe point of delivery to the most remote outletand the load of the section (see calculationexample in Figure 12-2). [NFPA 54:6.1.1]

1217.1.2 Branch Length Method. Pipe shall besized as follows [NFPA 54:6.1.2]:

(A) Pipe size of each section of the longestpipe run from the point of delivery tothe most remote outlet shall be deter-mined using the longest run of pipingand the load of the section. [NFPA54:6.1.2(1)]

(B) The pipe size of each section of branchpiping not previously sized shall bedetermined using the length of pipingfrom the point of delivery to the mostremote outlet in each branch and theload of the section. [NFPA 54:6.1.2(2)]

1217.1.3 Hybrid Pressure. The pipe size foreach section of higher-pressure gas piping shallbe determined using the longest length of pipingfrom the point of delivery to the most remoteline pressure regulator. The pipe size from theline pressure regulator to each outlet shall bedetermined using the length of piping from theregulator to the most remote outlet served by theregulator. [NFPA 54:6.1.3]

1217.2 Tables for Sizing Gas-Piping Systems.

Tables 12-8 through 12-41 shall be used to size gaspiping in conjunction with one (1) of the methodsdescribed in Sections 1217.1.1 through 1217.1.3.[NFPA 54:6.2]

1217.3 Sizing Equations. The inside diameter ofsmooth-wall pipe or tubing shall be determined bythe sizing equations 12-1 or 12-2, using the equiva-lent pipe length determined by Sections 1217.1.1through 1217.1.3. [NFPA 54:6.4]

Equation 12-1 Low-Pressure Gas Formula (Lessthan 1.5 psi [10.3 kPa]): [NFPA 54:6.4.1]

D=

( )∆H

Cr x L

Q0.381

0.20619.17

186

1215.1 – 1217.3 IDAHO STATE PLUMBING CODE

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where:

D = inside diameter of pipe, inches

Q = input rate appliance(s), cubic feet per hour at 60˚F (16ºC) and 30-inch (759 mm) mercury column

L = equivalent length of pipe, feet

∆H =pressure drop, inches water column (27.7 in.H2O = 1 psi)

Cr = in accordance with Table 12-4

Equation 12-2 High-Pressure Gas Formula (1.5 psi[10.3 kPa] and above): [NFPA 54:6.4.2]

where:

D = inside diameter of pipe, inches

Q = input rate appliance(s), cubic feet per hour at60ºF (16ºC) and 30-inch (759 mm) mercurycolumn

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 12-4

Y = in accordance with Table 12-4

1217.4 To determine the size of each section of pipein any system within the range of the Table, proceedas follows:

(A) Measure the length of the pipe from the gas meter location to the most remote outlet on thesystem.

(B) Select the length in feet column and row showingthe distance, or the next longer distance if thetable does not give the exact length.

(C) Starting at the most remote outlet, find in therow just selected the gas demand for that outlet.

If the exact figure of demand is not shown,choose the next larger figure in the row.

(D) At the top of this column will be found thecorrect size of pipe.

(E) Using this same row, proceed in a similarmanner for each section of pipe serving thisoutlet. For each section of pipe, determine thetotal gas demand supplied by that section.Where gas piping sections serve both heatingand cooling appliances and the installationprevents both units from operating simultane-ously, only the larger of the two (2) demandloads needs be used in sizing these sections.

(F) Size each section of branch piping not previ-ously sized by measuring the distance from thegas meter location to the most remote outlet inthat branch and follow the procedures of steps B,C, D, and E above.

Note: Size branch piping in the order of theirdistance from the meter location, beginning with themost distant outlet not previously sized.

1217.5 For conditions other than those covered bySection 1217.1, such as longer runs or greater gasdemands, the size of each gas piping system shall bedetermined by standard engineering methodsacceptable to the Authority Having Jurisdiction, andeach such system shall be so designed that the totalpressure drop between the meter or other point ofsupply and any outlet when full demand is beingsupplied to all outlets, shall comply with therequirements of Section 1209.4.

1217.6 Where the gas pressure exceeds fourteen (14)inches (356 mm) or less than six (6) inches (152 mm)of water column, or when diversity demand factorsare used, the design, pipe, sizing, materials, location,and use of such systems first shall be approved bythe Authority Having Jurisdiction. Piping systemsdesigned for pressures exceeding the serving gassupplier's standard delivery pressure shall haveprior verification from the gas supplier of the avail-ability of the design pressure.

D= Q0.381

0.20618.93[ ](P1

2 – P22) • Y

Cr x L

TABLE 12-4

Cr and Y for Natural Gas and Undiluted Propane

at Standard Conditions [NFPA 54: Table 6.4.2]

Formula Factors Gas Cr Y

Natural Gas 0.6094 0.9992

Undiluted Propane 1.2462 0.9910

For SI units, 1 ft.3 = 0.028 m3; 1 ft. = 0.305 m; 1 in. water column

= 0.249 kPa; 1 psi = 6.894 kPa; 1,000 Btu/h = 0.293 kW.

187

FUEL PIPING 1217.4 – 1217.6

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Solution:(1) Maximum gas demand of outlet A —

32 cubic feet per hour (0.21 L/sec.) (from Table 12-1).Maximum gas demand of outlet B —

3 cubic feet per hour (0.02 L/sec.) (from Table 12-1).Maximum gas demand of outlet C —

59 cubic feet per hour (0.46 L/sec.) (from Table 12-1).Maximum gas demand of outlet D —

136 cubic feet per hour (1.1 L/sec.) (150,000 Btu/hour [43,950 W]) divided by 1,100 Btu per cubic foot (11.4 Watt-hour/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 12-8:

Outlet A, supplying 32 cubic feet per hour (0.21 L/sec.), requires one-half (1/2) inch (15 mm) pipe. Section1, supplying outlets A and B, or 35 cubic feet per hour (0.24 L/sec.) requires one-half (1/2) inch (15 mm)pipe.

Section 2, supplying outlets A, B, and C, or 94 cubic feet per hour (0.7 L/sec.) requires three-quarter (3/4)inch (20 mm) pipe.

Section 3, supplying outlets A, B, C, and D, or 230 cubic feet per hour (1.8 L/sec.), requires one (1) inch (25mm) pipe.

(4) Using the column marked 60 feet (18,288 mm) in Table 12-8 (no column for actual length of 55 feet [16,764mm]:

Outlet B supplying 3 cubic feet per hour (0.02 L/sec.), requires one-half (1/2) inch (15 mm) pipe.

Outlet C, supplying 59 cubic feet per hour (0.46 L/sec.), requires one-half (1/2) inch (15 mm) pipe.

(5) Using the column marked 60 feet (18,288 mm) in Table 12-8:

Outlet D, supplying 136 cubic feet per hour (1.1 L/sec.), requires (3/4) inch (20 mm) pipe.

Figure 12-2 Example Illustrating Use of Tables 12-1 and 12-8

Problem: Determine the required pipe size of each section and outlet of the piping system shown in Figure 12-2.Gas to be used has a specific gravity of sixty-hundredths (0.60) and eleven-hundred (1,100) Btu per cubic foot(11.4 Watt-hour/L), delivered at eight (8) inch (203 mm) water column pressure.

188

Figure 12-2 Example IDAHO STATE PLUMBING CODE

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 0.5 in w.c.

Specific Gravity: 0.60

Pipe Size (in.)

Nominal: 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4 5 6 8 10 12

Actual ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026 5.047 6.065 7.981 10.020 11.938

Length (ft) Capacity in Cubic Feet of Gas per Hour

1020304050

172118958172

360247199170151

678466374320284

1,390957768657583

2,0901,4301,150

985873

4,0202,7602,2201,9001,680

6,4004,4003,5303,0202,680

11,3007,7806,2505,3504,740

23,10015,90012,70010,9009,660

41,80028,70023,00019,70017,500

67,60046,50037,30031,90028,300

139,00095,50076,70065,60058,200

252,000173,000139,000119,000106,000

399,000275,000220,000189,000167,000

60708090

100

6560565250

137126117110104

257237220207195

528486452424400

791728677635600

1,5201,4001,3001,2201,160

2,4302,2302,0801,9501,840

4,2903,9503,6703,4503,260

8,7608,0507,4907,0306,640

15,80014,60013,60012,70012,000

25,60023,60022,00020,60019,500

52,70048,50045,10042,30040,000

95,70088,10081,90076,90072,600

152,000139,000130,000122,000115,000

125150175200250

4440373430

9283777163

173157144134119

355322296275244

532482443412366

1,020928854794704

1,6301,4801,3601,2701,120

2,8902,6102,4102,2401,980

5,8905,3304,9104,5604,050

10,6009,6508,8808,2607,320

17,20015,60014,40013,40011,900

35,40032,10029,50027,50024,300

64,30058,30053,60049,90044,200

102,00092,30084,90079,00070,000

300350400450500

2725232221

5753494643

10899928682

221203189177168

331305283266251

638587546512484

1,020935870816771

1,8001,6501,5401,4401,360

3,6703,3703,1402,9402,780

6,6306,1005,6805,3305,030

10,7009,8809,1908,6208,150

22,10020,30018,90017,70016,700

40,10036,90034,30032,20030,400

63,40058,40054,30050,90048,100

550600650700750

2019181717

4139383635

7874716866

159152145140135

239228218209202

459438420403389

732699669643619

1,2901,2401,1801,1401,090

2,6402,5202,4102,3202,230

4,7804,5604,3604,1904,040

7,7407,3807,0706,7906,540

15,90015,20014,50014,00013,400

28,90027,50026,40025,30024,400

45,70043,60041,80040,10038,600

800850900950

1,000

1616151514

3433323130

6361595856

130126122118115

195189183178173

375363352342333

598579561545530

1,0601,020

992963937

2,1602,0902,0201,9601,910

3,9003,7803,6603,5503,460

6,3206,1105,9305,7605,600

13,00012,60012,20011,80011,500

23,60022,80022,10021,50020,900

37,30036,10035,00034,00033,100

1,1001,2001,3001,4001,500

1413121211

2827262524

5351494745

1091041009693

164156150144139

316301289277267

503480460442426

890849813781752

1,8101,7301,6601,5901,530

3,2803,1303,0002,8802,780

5,3205,0704,8604,6704,500

10,90010,4009,9809,5909,240

19,80018,90018,10017,40016,800

31,40030,00028,70027,60026,600

1,6001,7001,8001,9002,000

11111010

NA

2322222120

4442414039

8986848179

134130126122119

258250242235229

411398386375364

727703682662644

1,4801,4301,3901,3501,310

2,6802,5902,5202,4402,380

4,3404,2004,0703,9603,850

8,9208,6308,3708,1307,910

16,20015,70015,20014,80014,400

25,60024,80024,10023,40022,700

Table 12-8Schedule 40 Metallic Pipe [NFPA 54: Table 6.2(b)]

NA means a flow of less than 10 cfh.Note: All table entries are rounded to 3 significant digits.

Table 12-8FUEL PIPING

189

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Gas: Natural

Inlet Pressure: 2.0 psi

Pressure Drop: 1.0 psi

Specific Gravity: 0.60

Pipe Size (in.)

Nominal: 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

1,5101,070

869753673

3,0402,1501,7601,5201,360

5,5603,9303,2102,7802,490

11,4008,0706,5905,7105,110

17,10012,1009,8808,5507,650

32,90023,30019,00016,50014,700

52,50037,10030,30026,30023,500

92,80065,60053,60046,40041,500

189,000134,000109,00094,70084,700

60708090

100

615569532502462

1,2401,1501,0801,010

934

2,2702,1001,9701,8501,710

4,6604,3204,0403,8103,510

6,9806,4706,0505,7005,260

13,50012,50011,70011,00010,100

21,40019,90018,60017,50016,100

37,90035,10032,80030,90028,500

77,30071,60067,00063,10058,200

125150175200250

414372344318279

836751695642583

1,5301,3701,2701,1701,040

3,1402,8202,6012,4102,140

4,7004,2203,9103,6103,210

9,0608,1307,5306,9606,180

14,40013,00012,00011,1009,850

25,50022,90021,20019,60017,400

52,10046,70043,30040,00035,500

300350400450500

253232216203192

528486452424401

945869809759717

1,9401,7901,6601,5601,470

2,9102,6702,4902,3302,210

5,6005,1504,7904,5004,250

8,9208,2107,6407,1706,770

15,80014,50013,50012,70012,000

32,20029,60027,50025,80024,400

550600650700750

182174166160154

381363348334322

681650622598576

1,4001,3301,2801,2301,180

2,0902,0001,9101,8401,770

4,0303,8503,6803,5403,410

6,4306,1305,8705,6405,440

11,40010,80010,4009,9709,610

23,20022,10021,20020,30019,600

800850900950

1,000

149144139135132

311301292283275

556538522507493

1,1401,1001,0701,0401,010

1,7101,6501,6001,5601,520

3,2903,1903,0903,0002,920

5,2505,0804,9304,7804,650

9,2808,9808,7108,4608,220

18,90018,30017,80017,20016,800

1,1001,2001,3001,4001,500

125119114110106

262250239230221

468446427411396

960917878843812

1,4401,3701,3201,2601,220

2,7702,6402,5302,4302,340

4,4204,2204,0403,8803,740

7,8107,4507,1406,8606,600

15,90015,20014,60014,00013,500

1,6001,7001,8001,9002,000

10299969391

214207200195189

382370358348339

784759736715695

1,1801,1401,1001,0701,040

2,2602,1902,1202,0602,010

3,6103,4903,3903,2903,200

6,3806,1705,9805,8105,650

13,00012,60012,20011,90011,500

Note: All table entries are rounded to 3 significant digits.

Table 12-9Schedule 40 Metallic Pipe [NFPA 54: Table 6.2(c)]

Table 12-9 IDAHO STATE PLUMBING CODE

190

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Gas: Natural

Inlet Pressure: 3.0 psi

Pressure Drop: 2.0 psi

Specific Gravity: 0.60

Pipe Size (in.)

Nominal: 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

2,3501,6201,3001,110

985

4,9203,3802,7202,3202,060

9,2706,3705,1104,3803,880

19,00013,10010,5008,9907,970

28,50019,60015,70013,50011,900

54,90037,70030,30025,90023,000

87,50060,10048,30041,30036,600

155,000106,00085,40073,10064,800

316,000217,000174,000149,000132,000

60708090

100

892821764717677

1,8701,7201,6001,5001,420

3,5203,2303,0102,8202,670

7,2206,6406,1805,8005,470

10,8009,9509,2608,6808,200

20,80019,20017,80016,70015,800

33,20030,50028,40026,70025,200

58,70054,00050,20047,10044,500

120,000110,000102,00096,10090,800

125150175200250

600544500465412

1,2501,1401,050

973862

2,3602,1401,9701,8301,620

4,8504,4004,0403,7603,330

7,2706,5906,0605,6405,000

14,00012,70011,70010,9009,620

22,30020,20018,60017,30015,300

39,50035,70032,90030,60027,100

80,50072,90067,10062,40055,300

300350400450500

374344320300283

781719669627593

1,4701,3501,2601,1801,120

3,0202,7802,5902,4302,290

4,5304,1703,8703,6403,430

8,7208,0207,4607,0006,610

13,90012,80011,90011,20010,500

24,60022,60021,00019,70018,600

50,10046,10042,90040,20038,000

550600650700750

269257246236228

563537514494476

1,0601,010

969931897

2,1802,0801,9901,9101,840

3,2603,1102,9802,8602,760

6,2805,9905,7405,5105,310

10,0009,5509,1508,7908,470

17,70016,90016,20015,50015,000

36,10034,40033,00031,70030,500

800850900950

1,000

220213206200195

460445431419407

866838812789767

1,7801,7201,6701,6201,580

2,6602,5802,5002,4302,360

5,1304,9604,8104,6704,550

8,1807,9107,6707,4507,240

14,50014,00013,60013,20012,800

29,50028,50027,70026,90026,100

1,1001,2001,3001,4001,500

185177169162156

387369353340327

729695666640616

1,5001,4301,3701,3101,270

2,2402,1402,0501,9701,900

4,3204,1203,9403,7903,650

6,8906,5706,2906,0405,820

12,20011,60011,10010,70010,300

24,80023,70022,70021,80021,000

1,6001,7001,8001,9002,000

151146142138134

316306296288280

595576558542527

1,2201,1801,1501,1101,080

1,8301,7701,7201,6701,620

3,5303,4103,3103,2103,120

5,6205,4405,2705,1204,980

10,0009,6109,3209,0508,800

20,30019,60019,00018,40018,000

Table 12-10Schedule 40 Metallic Pipe [NFPA 54: Table 6.2(d)]

Note: All table entries are rounded to 3 significant digits

Table 12-10FUEL PIPING

191

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Gas: Natural

Inlet Pressure: 5.0 psi

Pressure Drop: 3.5 psi

Specific Gravity: 0.60

Pipe Size (in.)

Nominal: 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

3,1902,2501,8401,5901,430

6,4304,5503,7203,2202,880

11,8008,3206,7905,8805,260

24,20017,10014,00012,10010,800

36,20025,60020,90018,10016,200

69,70049,30040,30034,90031,200

111,00078,60064,20055,60049,700

196,000139,000113,00098,20087,900

401,000283,000231,000200,000179,000

60708090

100

1,3001,2001,1501,060

979

2,6302,4302,3302,1501,980

4,8004,4504,2603,9203,620

9,8609,1308,5408,0507,430

14,80013,70012,80012,10011,100

28,50026,40024,70023,20021,400

45,40042,00039,30037,00034,200

80,20074,30069,50065,50060,400

164,000151,000142,000134,000123,000

125150175200250

876786728673558

1,7701,5901,4701,3601,170

3,2402,9102,6902,4902,200

6,6405,9605,5205,1004,510

9,9508,9408,2707,6506,760

19,20017,20015,90014,70013,000

30,60027,40025,40023,50020,800

54,00048,50044,90041,50036,700

110,00098,90091,60084,70074,900

300350400450500

506465433406384

1,060973905849802

1,9901,8301,7101,6001,510

4,0903,7603,5003,2903,100

6,1305,6405,2504,9204,650

11,80010,90010,1009,4808,950

18,80017,30016,10015,10014,300

33,30030,60028,50026,70025,200

67,80062,40058,10054,50051,500

550600650700750

364348333320308

762727696669644

1,4401,3701,3101,2601,210

2,9502,8102,6902,5902,490

4,4204,2104,0303,8803,730

8,5008,1107,7707,4607,190

13,60012,90012,40011,90011,500

24,00022,90021,90021,00020,300

48,90046,60044,60042,90041,300

800850900950

1,000

298288279271264

622602584567551

1,1701,1301,1001,0701,040

2,4102,3302,2602,1902,130

3,6103,4903,3803,2903,200

6,9406,7206,5206,3306,150

11,10010,70010,40010,1009,810

19,60018,90018,40017,80017,300

39,90038,60037,40036,40035,400

1,1001,2001,3001,4001,500

250239229220212

524500478460443

987941901866834

2,0301,9301,8501,7801,710

3,0302,9002,7702,6602,570

5,8405,5805,3405,1304,940

9,3208,8908,5108,1807,880

16,50015,70015,00014,50013,900

33,60032,00030,70029,50028,400

1,6001,7001,8001,9002,000

205198192186181

428414401390379

806780756734714

1,6501,6001,5501,5101,470

2,4802,4002,3302,2602,200

4,7704,6204,4804,3504,230

7,6107,3607,1406,9306,740

13,40013,00012,60012,30011,900

27,40026,50025,70025,00024,300

Table 12-11Schedule 40 Metallic Pipe [NFPA 54: Table 6.2(e)]

Note: All table entries are rounded to 3 significant digits.

Table 12-11 IDAHO STATE PLUMBING CODE

192

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Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 0.3 in. w.c.

Specific Gravity: 0.60

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

20141110

NA

4229232017

8558474035

148102827062

2101441169988

448308247211187

806554445381337

1,270873701600532

2,6501,8201,4601,2501,110

60708090

100

NANANANANA

1614131312

3229272624

5652484543

7973686460

170156145136129

306281262245232

482443413387366

1,000924859806761

125150175200250

NANANANANA

1110

NANANA

2220181715

3834312926

5348454137

114103958978

206186171159141

324294270251223

675612563523464

300350400450500

NANANANANA

NANANANANA

1312111110

2322201918

3331282725

7165615754

12811811010397

202186173162153

420387360338319

550600650700750

NANANANANA

NANANANANA

NANANANANA

1716151514

2423222120

5149474543

9288848178

145139133128123

303289277266256

800850900950

1,000

NANANANANA

NANANANANA

NANANANANA

1413131312

2019181817

4240393837

7573716967

119115111108105

247239232225219

1,1001,2001,3001,4001,500

NANANANANA

NANANANANA

NANANANANA

12111110

NA

1616151414

3534323130

6360585654

10095918884

208199190183176

1,6001,7001,8001,9002,000

NANANANANA

NANANANANA

NANANANANA

NANANANANA

1313131212

2928272625

5250494746

8279777472

170164159155151

Table 12-12 Semi-Rigid Copper Tubing [NFPA 54: Table 6.2(f)]

NA means a flow of less than 10 cfh.Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Table 12-12FUEL PIPING

193

READ ONLY

READ ONLY

Table 12-13Semi-Rigid Copper Tubing [NFPA 54: Table 6.2(g)]

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 0.5 in. w.c.

Specific Gravity: 0.60

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

2718151311

5538302623

11177615347

1951341079282

276190152131116

590406326279247

1,060730586502445

1,6801,150

925791701

3,4902,4001,9301,6501,460

60708090

100

10NANANANA

2119181716

4239363432

7468635956

10596908479

224206192180170

403371345324306

635585544510482

1,3201,2201,1301,0601,000

125150175200250

NANANANANA

14131211

NA

2826242220

5045413934

7064595548

151136125117103

271245226210186

427387356331294

890806742690612

300350400450500

NANANANANA

NANANANANA

1816151413

3128262523

4440383533

9486807571

169155144135128

266245228214202

554510474445420

550600650700750

NANANANANA

NANANANANA

1312121111

2221202019

3230292827

6864625957

122116111107103

192183175168162

399381365350338

800850900950

1,000

NANANANANA

NANANANANA

1010

NANANA

1818171716

2625242423

5553525049

9996939088

156151147143139

326315306297289

1,1001,2001,3001,4001,500

NANANANANA

NANANANANA

NANANANANA

1515141313

2221201918

4644424139

8480767371

132126120116111

274262251241232

1,6001,7001,8001,9002,000

NANANANANA

NANANANANA

NANANANANA

1312121111

1817171616

3837363534

6866646260

1081041019895

224217210204199

NA means a flow of less than 10 cfh.Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Table 12-13 IDAHO STATE PLUMBING CODE

194

READ ONLY

READ ONLY

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 (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

3927211816

8055443833

162111897768

283195156134119

402276222190168

859590474406359

1,5501,060

853730647

2,4401,6801,3501,1501,020

5,0803,4902,8002,4002,130

60708090

100

1513131211

3028262423

6157534947

10799928682

152140131122116

326300279262247

586539502471445

925851791742701

1,9301,7701,6501,5501,460

125150175200250

NANANANANA

2018171614

4137343228

7265605650

10393857970

219198183170151

394357329306271

622563518482427

1,2901,1701,0801,000

890

300350400450500

NANANANANA

13121110

NA

2624222120

4541393634

6459555148

136125117110103

245226210197186

387356331311294

806742690647612

550600650700750

NANANANANA

NANANANANA

1918171616

3231302827

4644424039

9894908683

177169162155150

279266255245236

581554531510491

800850900950

1,000

NANANANANA

NANANANANA

1515141413

2626252423

3836353433

8078757371

144140135132128

228220214207202

474459445432420

1,1001,2001,3001,4001,500

NANANANANA

NANANANANA

1312121111

2221202019

3230292827

6864625957

122116111107103

192183175168162

399381365350338

1,6001,7001,8001,9002,000

NANANANANA

NANANANANA

1010

NANANA

1818171716

2625242423

5553525049

9996939088

156151147143139

326315306297289

Table 12-14Semi-Rigid Copper Tubing [NFPA 54-09: Table 6.2(h)]

NA means a flow of less than 10 cfh.Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Table 12-14FUEL PIPING

195

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 17.0 in. w.c.

Specific Gravity: 0.60

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

1901301059079

391269216185164

796547439376333

1,390956768657582

1,9701,3601,090

932826

4,2202,9002,3301,9901,770

7,5905,2204,1903,5903,180

12,0008,2306,6105,6505,010

24,90017,10013,80011,80010,400

60708090

100

7266625855

148137127119113

302278258243229

528486452424400

749689641601568

1,6001,4701,3701,2801,210

2,8802,6502,4602,3102,180

4,5404,1803,8903,6503,440

9,4608,7008,0907,5907,170

125150175200250

4844403833

10090837769

203184169157140

355321296275244

503456420390346

1,080974896834739

1,9401,7501,6101,5001,330

3,0502,7702,5402,3702,100

6,3605,7605,3004,9304,370

300350400450500

3028262423

6257535047

12611610810296

221203189177168

313288268252238

670616573538508

1,2101,1101,030

968914

1,9001,7501,6301,5301,440

3,9603,6403,3903,1803,000

550600650700750

2221201918

4543413938

9187838077

159152145140135

226215206198191

482460441423408

868829793762734

1,3701,3101,2501,2001,160

2,8502,7202,6102,5002,410

800850900950

1,000

1817171616

3735343332

7472706866

130126122118115

184178173168163

394381370359349

709686665646628

1,1201,0801,0501,020

991

2,3302,2502,1802,1202,060

1,1001,2001,3001,4001,500

1514141313

3129282726

6360575553

1091041009693

155148142136131

332316303291280

597569545524505

941898860826796

1,9601,8701,7901,7201,660

1,6001,7001,8001,9002,000

1212111111

2524242322

5149484745

8986848179

127123119115112

271262254247240

487472457444432

768744721700681

1,6001,5501,5001,4601,420

Table 12-15 Semi-Rigid Copper Tubing [NFPA 54: Table 6.2(i)]

Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Table 12-15 IDAHO STATE PLUMBING CODE

196

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: 2.0 psi

Pressure Drop: 1.0 psi

Specific Gravity: 0.60

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

245169135116103

506348279239212

1,030708568486431

1,8001,240

993850754

2,5501,7601,4101,2101,070

5,4503,7503,0102,5802,280

9,8206,7505,4204,6404,110

15,50010,6008,5507,3106,480

32,20022,20017,80015,20013,500

60708090

100

9386807571

192177164154146

391359334314296

683628584548518

969891829778735

2,0701,9001,7701,6601,570

3,7303,4303,1902,9902,830

5,8705,4005,0304,7204,450

12,20011,30010,5009,8209,280

125150175200250

6357524943

12911710810089

263238219204181

459416383356315

651590543505448

1,3901,2601,1601,080

956

2,5002,2702,0901,9401,720

3,9503,5803,2903,0602,710

8,2207,4506,8506,3805,650

300350400450500

3936333130

8074696561

164150140131124

286263245230217

406373347326308

866797741696657

1,5601,4301,3301,2501,180

2,4602,2602,1001,9701,870

5,1204,7104,3804,1103,880

550600650700750

2827262524

5855535149

118112108103100

206196188181174

292279267256247

624595570548528

1,1201,0701,030

986950

1,7701,6901,6201,5501,500

3,6903,5203,3703,2403,120

800850900950

1,000

2322222120

4746444342

9693908885

168163158153149

239231224217211

510493478464452

917888861836813

1,4501,4001,3601,3201,280

3,0102,9202,8302,7402,670

1,1001,2001,3001,4001,500

1918181716

4038363534

8177747168

142135129124120

201192183176170

429409392376363

772737705678653

1,2201,1601,1101,0701,030

2,5402,4202,3202,2302,140

1,6001,7001,8001,9002,000

1615151414

3331303029

6664626059

116112108105102

164159154149145

350339329319310

630610592575559

994962933906881

2,0702,0001,9401,8901,830

Table 12-16Semi-Rigid Copper Tubing [NFPA 54: Table 6.2(j)]

Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Table 12-16FUEL PIPING

197

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: 2.0 psi

Pressure Drop: 1.5 psi

Specific Gravity: 0.60

INTENDED USE: Pipe Sizing Between Point of Delivery and the House Line Regulator. Total Load Supplied by a

Single House Line Regulator Not Exceeding 150 Cubic Feet per Hour. †

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

303208167143127

625430345295262

1,270874702601532

2,2201,5301,2301,050

931

3,1502,1701,7401,4901,320

6,7404,6303,7203,1802,820

12,1008,3306,6905,7305,080

19,10013,10010,6009,0308,000

39,80027,40022,00018,80016,700

60708090

100

115106989287

237218203190180

482444413387366

843776722677640

1,2001,1001,020

961907

2,5602,3502,1902,0501,940

4,6004,2303,9403,6903,490

7,2506,6706,2105,8205,500

15,10013,90012,90012,10011,500

125150175200250

7770646053

159144133124110

324294270252223

567514472440390

804729670624553

1,7201,5601,4301,3301,180

3,0902,8002,5802,4002,130

4,8804,4204,0603,7803,350

10,2009,2008,4607,8706,980

300350400450500

4844413936

9991858075

202186173162153

353325302283268

501461429402380

1,070984916859811

1,9301,7701,6501,5501,460

3,0402,7902,6002,4402,300

6,3205,8205,4105,0804,800

550600650700750

3533323029

7268656360

146139133128123

254243232223215

361344330317305

771735704676652

1,3901,3201,2701,2201,170

2,1902,0902,0001,9201,850

4,5604,3504,1604,0003,850

800850900950

1,000

2827272625

5857555352

119115111108105

208201195189184

295285276268261

629609590573558

1,1301,1001,0601,0301,000

1,7901,7301,6801,6301,580

3,7203,6003,4903,3903,300

1,1001,2001,3001,4001,500

2423222120

4947454342

10095918885

175167160153148

248237227218210

530505484465448

954910871837806

1,5001,4301,3701,3201,270

3,1302,9902,8602,7502,650

1,6001,7001,8001,9002,000

1919181817

4039383736

8279777472

143138134130126

202196190184179

432419406394383

779753731709690

1,2301,1901,1501,1201,090

2,5602,4702,4002,3302,270

Table 12-17Semi-Rigid Copper Tubing [NFPA 54-09: Table 6.2(k)]

Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.†When 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 in. w.c.

Table 12-17 IDAHO STATE PLUMBING CODE

198

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: 5.0 psi

Pressure Drop: 3.5 psi

Specific Gravity: 0.60

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Cubic Feet of Gas per Hour

1020304050

511351282241214

1,050724582498441

2,1401,4701,1801,010

898

3,7502,5802,0701,7701,570

5,3203,6502,9302,5102,230

11,4007,8006,2705,3604,750

20,40014,00011,3009,6608,560

32,20022,20017,80015,20013,500

67,10046,10037,00031,70028,100

60708090

100

194178166156147

400368342321303

813748696653617

1,4201,3101,2201,1401,080

2,0201,8601,7301,6201,530

4,3103,9603,6903,4603,270

7,7507,1306,6406,2305,880

12,20011,20010,5009,8209,270

25,50023,40021,80020,40019,300

125150175200250

13011810910190

269243224208185

547495456424376

955866796741657

1,3601,2301,1301,050

932

2,9002,6202,4102,2501,990

5,2104,7204,3504,0403,580

8,2207,4506,8506,3705,650

17,10015,50014,30013,30011,800

300350400450500

8175696562

167154143134127

340313291273258

595547509478451

844777722678640

1,8001,6601,5401,4501,370

3,2502,9902,7802,6102,460

5,1204,7104,3804,1103,880

10,7009,8109,1208,5608,090

550600650700750

5856535149

121115110106102

245234224215207

429409392376362

608580556534514

1,3001,2401,1901,1401,100

2,3402,2302,1402,0501,980

3,6903,5203,3703,2403,120

7,6807,3307,0206,7406,490

800850900950

1,000

4846454342

9895929087

200194188182177

350339328319310

497481466452440

1,0601,0301,000

967940

1,9101,8501,7901,7401,690

3,0102,9102,8202,7402,670

6,2706,0705,8805,7105,560

1,1001,2001,3001,4001,500

4038373534

8379767370

169161154148143

295281269259249

418399382367353

893852816784755

1,6101,5301,4701,4101,360

2,5302,4202,3202,2202,140

5,2805,0404,8204,6304,460

1,6001,7001,8001,9002,000

3332313029

6865636260

138133129125122

241233226219213

341330320311302

729705684664646

1,3101,2701,2301,2001,160

2,0702,0001,9401,8901,830

4,3104,1704,0403,9303,820

Table 12-18Semi-Rigid Copper Tubing [NFPA 54: Table 6.2(l)]

Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Table 12-18FUEL PIPING

199

READ ONLY

READ ONLY

Table 12-19Corrugated Stainless Steel Tubing (CSST) [NFPA 54-09: Table 6.2(m)]

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.Notes:(1) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased

by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additionalfittings and/or bends.

(2) All table entries are rounded to 3 significant digits.

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.Notes:(1) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased

by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additionalfittings and/or bends.

(2) All table entries are rounded to 3 significant digits.

Table 12-20Corrugated Stainless Steel Tubing (CSST) [NFPA 54: Table 6.2(n)]

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 0.5 in. w.c.

Specific Gravity: 0.60

Tube Size (EHD)*

Flow Designation: 13 15 18 19 23 25 30 31 37 39 46 48 60 62

Length (ft) Capacity in Cubic Feet of Gas per Hour

510152025

4632252219

6344353127

11582665852

13495776760

225161132116104

270192157137122

471330267231206

546383310269240

895639524456409

1,037746615536482

1,7901,2601,030

888793

2,0701,4701,2001,050

936

3,6602,6002,1401,8501,660

4,1402,9302,4002,0801,860

30405060

18151312

25211917

47413734

55474238

96837568

112978780

188162144131

218188168153

374325292267

442386347318

723625559509

856742665608

1,5201,3201,1801,080

1,7001,4701,3201,200

708090

100

1110109

16151413

31292826

36333230

63605754

74696562

121113107101

141132125118

248232219208

295277262249

471440415393

563527498472

1,000940887843

1,1101,040

983933

150200250300

7655

10987

20181615

23211917

42383432

48443936

78716357

91827467

17114813395

205179161148

320277247226

387336301275

691600538492

762661591540

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 3.0 in. w.c.

Specific Gravity: 0.60

Tube Size (EHD)*

Flow Designation: 13 15 18 19 23 25 30 31 37 46 48 60 62

Length (ft) Capacity in Cubic Feet of Gas per Hour

510152025

12083675751

160112907869

277197161140125

327231189164147

529380313273245

649462379329295

1,180828673580518

1,370958778672599

2,1401,5301,2501,090

978

4,4303,2002,5402,2001,960

5,0103,5602,9102,5302,270

8,8006,2705,1404,4604,000

10,1007,1605,8505,0704,540

30405060

46393532

63544844

1151008982

13411610495

225196176161

270234210192

471407363330

546471421383

895778698639

1,7901,5501,3801,260

2,0701,8001,6101,470

3,6603,1802,8502,600

4,1403,5903,2102,930

708090

100

29272624

41383634

76716763

88827773

150141133126

178167157149

306285268254

355331311295

593555524498

1,1701,0901,030

974

1,3601,2801,2001,140

2,4202,2602,1402,030

2,7202,5402,4002,280

150200250300

19171513

27232119

52454037

60524642

104918275

1221069587

206178159144

240207184168

409355319234

793686613559

936812728665

1,6601,4401,2901,180

1,8601,6101,4401,320

Table 12-19 – Table 12-20 IDAHO STATE PLUMBING CODE

200

READ ONLY

READ ONLY

Table 12-21Corrugated Stainless Steel Tubing (CSST) [NFPA 54: Table 6.2(o)]

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.Notes:(1) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased

by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additionalfittings and/or bends.

(2) All table entries are rounded to 3 significant digits.

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.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

regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.(2) CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for

guidance.(3) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased

by an equivalent length of tubing according to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number ofadditional fittings and/or bends.

(4) All table entries are rounded to 3 significant digits.

Table 12-22Corrugated Stainless Steel Tubing (CSST) [NFPA 54-09: Table 6.2(p)]

Gas: Natural

Inlet Pressure: 2.0 psi

Pressure Drop: 1.0 psi

Specific Gravity: 0.60

Tube Size (EHD)*

Flow Designation: 13 15 18 19 23 25 30 31 37 39 46 48 60 62

Length (ft) Capacity in Cubic Feet of Gas per Hour

1025304050

270166151129115

353220200172154

587374342297266

700444405351314

1100709650567510

1,370876801696624

2,5901,6201,4801,2701,140

2,9901,8701,7001,4701,310

4,5102,8902,6402,3002,060

5,0373,2582,9872,6052,343

9,6006,0405,5104,7604,260

10,7006,7806,2005,3804,820

18,60011,90010,9009,4408,470

21,60013,70012,50010,9009,720

7580

100150200

9389796455

1241201078775

218211189155135

257249222182157

420407366302263

512496445364317

922892795646557

1,0701,030

920748645

1,6901,6401,4701,2101,050

1,9321,8741,6851,3891,212

3,4703,3603,0002,4402,110

3,9503,8203,4202,8002,430

6,9406,7306,0304,9404,290

7,9407,6906,8805,6204,870

250300400500

49443834

67615246

1211109686

141129111100

236217189170

284260225202

497453390348

576525453404

941862749552

1,090999871783

1,8901,7201,4901,330

2,1801,9901,7301,550

3,8503,5203,0602,740

4,3603,9803,4503,090

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 6.0 in. w.c.

Specific Gravity: 0.60

Tube Size (EHD)*

Flow Designation: 13 15 18 19 23 25 30 31 37 46 48 60 62

Length (ft) Capacity in Cubic Feet of Gas per Hour

510152025

173120968374

22916013011299

389277227197176

461327267231207

737529436380342

911649532462414

1,6901,180

960828739

1,9501,3701,110

958855

3,0002,1401,7601,5301,370

6,2804,4303,6103,1202,790

7,0505,0104,1003,5603,190

12,4008,8007,2106,2705,620

14,26010,1008,2607,1606,400

30405060

67575146

90786963

161140125115

189164147134

313273245225

379329295270

673580518471

778672599546

1,2501,090

978895

2,5402,2001,9601,790

2,9102,5302,2702,070

5,1404,4604,0003,660

5,8505,0704,5404,140

708090

100

42393735

58545148

1061009489

124116109104

209196185176

250234221210

435407383363

505471444421

830778735698

1,6601,5501,4601,380

1,9201,8001,7001,610

3,3903,1803,0002,850

3,8403,5903,3903,210

150200250300

28242119

39343027

73635752

85736660

145126114104

172149134122

294254226206

342295263240

573498447409

1,130974870793

1,3201,1401,020

936

2,3402,0301,8201,660

2,6302,2802,0401,860

Table 12-21 – Table 12-22FUEL PIPING

201

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: 5.0 psi

Pressure Drop: 3.5 psi

Specific Gravity: 0.60

Tube Size (EHD)*

Flow Designation: 13 15 18 19 23 25 30 31 37 39 46 48 60 62

Length (ft) Capacity in Cubic Feet of Gas per Hour

1025304050

523322292251223

674420382329293

1,080691632549492

1,300827755654586

2,0001,2901,1801,030

926

2,5301,6201,4801,2801,150

4,9203,0802,8002,4202,160

5,6603,5403,2302,7902,490

8,3005,3104,8604,2303,790

9,1405,9115,4204,7274,251

18,10011,40010,4008,9708,020

19,80012,60011,50010,0008,930

34,40022,00020,10017,40015,600

40,40025,60023,40020,20018,100

7580

100150200

180174154124107

238230205166143

403391350287249

479463415339294

763740665548478

944915820672584

1,7501,6901,5101,2301,060

2,0201,9601,7401,4201,220

3,1103,0202,7102,2201,930

3,5063,4003,0572,5212,199

6,5306,3205,6504,6003,980

7,3207,0906,3505,2004,510

12,80012,40011,1009,1307,930

14,80014,30012,80010,5009,090

250300400500

95867466

12811610089

223204177159

263240208186

430394343309

524479416373

945860742662

1,090995858766

1,7301,5901,3801,040

1,9771,8131,5811,422

3,5503,2402,8002,500

4,0403,6903,2102,870

7,1106,5005,6505,060

8,1407,4306,4405,760

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.Notes:(1) Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 1 psi, do not use this table. Consult with regu-

lator manufacturer for pressure drops and capacity factors. Pressure drops across regulator may vary with the flow rate.(2) CAUTION: Capacities shown in table may exceed maximum capacity of selected regulator. Consult tubing manufacturer for guidance.(3) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased

by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additionalfittings and/or bends.

(4) All table entries are rounded to 3 significant digits.

Table 12-23Corrugated Stainless Steel Tubing (CSST) [NFPA 54-09: Table 6.2(q)]

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 0.3 in. w.c.

Specific Gravity: 0.60

Pipe Size (in.)

Nominal OD: 1/2 3/4 1 1-1/4 1-1/2 2

Designation: SDR 9.33 SDR 11.0 SDR 11.00 SDR 10.00 SDR 11.00 SDR 11.00

Actual ID: 0.660 0.860 1.077 1.328 1.554 1.943

Length (ft) Capacity in Cubic Feet of Gas per Hour

1020304050

153105847264

305210169144128

551379304260231

955656527451400

1,440991796681604

2,5901,7801,4301,2201,080

60708090

100

5853504644

116107999388

209192179168159

362333310291275

547503468439415

983904841789745

125150175200250

3935323027

7871656054

14112711710997

243221203189167

368333306285253

661598551512454

300350400450500

2422211918

4845423937

8881757066

152139130122115

229211196184174

411378352330312

Table 12-24Polyethylene Plastic Pipe [NFPA 54: Table 6.2(r)]

Note: All table entries are rounded to 3 significant digits.

Table 12-23 – Table 12-24 IDAHO STATE PLUMBING CODE

202

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: Less than 2 psi

Pressure Drop: 0.5 in. w.c.

Specific Gravity: 0.60

Pipe Size (in.)

Nominal OD: 1/2 3/4 1 1-1/4 1-1/2 2

Designation: SDR 9.33 SDR 11.0 SDR 11.00 SDR 10.00 SDR 11.00 SDR 11.00

Actual ID: 0.660 0.860 1.077 1.328 1.554 1.943

Length (ft) Capacity in Cubic Feet of Gas per Hour

1020304050

2011381119584

403277222190169

726499401343304

1,260865695594527

1,9001,3101,050

898796

3,4102,3501,8801,6101,430

60708090

100

7670656158

153140131123116

276254236221209

477439409383362

721663617579547

1,3001,1901,1101,040

983

125150175200250

5146434035

10393868071

185168154144127

321291268249221

485439404376333

871789726675598

300350400450500

3229272624

6459555148

115106999388

200184171160152

302278258242229

542499464435411

Table 12-25Polyethylene Plastic Pipe [NFPA 54: Table 6.2(s)]

Note: All table entries are rounded to 3 significant digits.

Table 12-25FUEL PIPING

203

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: 2.0 psi

Pressure Drop: 1.0 psi

Specific Gravity: 0.60

Pipe Size (in.)

Nominal OD: 1/2 3/4 1 1-1/4 1-1/2 2

Designation: SDR 9.33 SDR 11.0 SDR 11.00 SDR 10.00 SDR 11.00 SDR 11.00

Actual ID: 0.660 0.860 1.077 1.328 1.554 1.943

Length (ft) Capacity in Cubic Feet of Gas per Hour

1020304050

1,8601,2801,030

878778

3,7202,5602,0501,7601,560

6,7104,6103,7103,1702,810

11,6007,9906,4205,4904,870

17,60012,1009,6908,3007,350

31,60021,70017,40014,90013,200

60708090

100

705649603566535

1,4101,3001,2101,1301,070

2,5502,3402,1802,0501,930

4,4104,0603,7803,5403,350

6,6606,1305,7005,3505,050

12,00011,00010,2009,6109,080

125150175200250

474429395368326

949860791736652

1,7101,5501,4301,3301,180

2,9702,6902,4702,3002,040

4,4804,0603,7303,4703,080

8,0507,2906,7106,2405,530

300350400450500

295272253237224

591544506475448

1,070981913856809

1,8501,7001,5801,4801,400

2,7902,5702,3902,2402,120

5,0104,6104,2904,0203,800

550600650700750

213203194187180

426406389374360

768733702674649

1,3301,2701,2201,1701,130

2,0101,9201,8401,7601,700

3,6103,4403,3003,1703,050

800850900950

1,000

174168163158154

348336326317308

627607588572556

1,0901,0501,020

990963

1,6401,5901,5401,5001,450

2,9502,8502,7702,6902,610

1,1001,2001,3001,4001,500

146139134128124

293279267257247

528504482463446

915873836803773

1,3801,3201,2601,2101,170

2,4802,3702,2702,1802,100

1,6001,7001,8001,9002,000

119115112109106

239231224218212

431417404393382

747723701680662

1,1301,0901,0601,0301,000

2,0301,9601,9001,8501,800

Table 12-26Polyethylene Plastic Pipe [NFPA 54: Table 6.2(t)]

Note: All table entries are rounded to 3 significant digits.

Table 12-26 IDAHO STATE PLUMBING CODE

204

READ ONLY

READ ONLY

Gas: Natural

Inlet Pressure: Less than 2.0 psi

Pressure Drop: 0.3 in. w.c.

Specific Gravity: 0.60

Plastic Tubing Size (CTS)* (in.)

Nominal OD: 1/2 3/4

Designation: SDR 7.00 SDR 11.00

Actual ID: 0.445 0.927

Length (ft) Capacity in Cubic Feet of Gas per Hour

1020304050

5437302623

372256205176156

60708090

100

2119181716

141130121113107

125150175200

14131211

95867974

225250275300

10NANANA

69656259

350400450500

NANANANA

54514745

Gas: Natural

Inlet Pressure: Less than 2.0 psi

Pressure Drop: 0.5 in. w.c.

Specific Gravity: 0.60

Plastic Tubing Size (CTS)* (in.)

Nominal OD: 1/2 3/4

Designation: SDR 7.00 SDR 11.00

Actual ID: 0.445 0.927

Length (ft) Capacity in Cubic Feet of Gas per Hour

1020304050

7249393430

490337271232205

60708090

100

2725232221

186171159149141

125150175200

18171514

12511310497

225250275300

13121111

91868278

350400450500

10NANANA

72676359

Table 12-27Polyethylene Plastic Tubing [NFPA 54: Table 6.2(u)]

Table 12-28Polyethylene Plastic Tubing [NFPA 54: Table 6.2(v)]

* CTS = Copper tube size.NA means a flow of less than 10 cfh.Note: All table entries are rounded to 3 significant digits.

* CTS = Copper tube size.NA means a flow of less than 10 cfh.Note: All table entries are rounded to 3 significant digits.

Table 12-27 – Table 12-28FUEL PIPING

205

READ ONLY

READ ONLY

Gas: Undiluted Propane

Inlet Pressure: 10.0 psi

Pressure Drop: 1.0 psi

Specific Gravity: 1.50

INTENDED USE: Pipe Sizing Between First Stage (High Pressure Regulator) and Second Stage (Low Pressure Regulator).

Pipe Size (in.)

Nominal

Inside:1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

3,3202,2801,8301,5701,390

6,9504,7803,8403,2802,910

13,1009,0007,2206,1805,480

26,90018,50014,80012,70011,300

40,30027,70022,20019,00016,900

77,60053,30042,80036,60032,500

124,00085,00068,20058,40051,700

219,000150,000121,000103,00091,500

446,000306,000246,000211,000187,000

60708090

100

1,2601,1601,0801,010

956

2,6402,4302,2602,1202,000

4,9704,5704,2503,9903,770

10,2009,3808,7308,1907,730

15,30014,10013,10012,30011,600

29,40027,10025,20023,60022,300

46,90043,10040,10037,70035,600

82,90076,30070,90066,60062,900

169,000156,000145,000136,000128,000

125150175200250

848768706657582

1,7701,6101,4801,3701,220

3,3403,0202,7802,5902,290

6,8506,2105,7105,3204,710

10,3009,3008,5607,9607,060

19,80017,90016,50015,30013,600

31,50028,60026,30024,40021,700

55,70050,50046,50043,20038,300

114,000103,00094,70088,10078,100

300350400450500

528486452424400

1,1001,020

945886837

2,0801,9101,7801,6701,580

4,2703,9303,6503,4303,240

6,4005,8805,4705,1404,850

12,30011,30010,5009,8909,340

19,60018,10016,80015,80014,900

34,70031,90029,70027,90026,300

70,80065,10060,60056,80053,700

550600650700750

380363347334321

795759726698672

1,5001,4301,3701,3101,270

3,0702,9302,8102,7002,600

4,6104,4004,2104,0403,900

8,8708,4608,1107,7907,500

14,10013,50012,90012,40012,000

25,00023,90022,80021,90021,100

51,00048,60046,60044,80043,100

800850900950

1,000

310300291283275

649628609592575

1,2201,1801,1501,1101,080

2,5102,4302,3602,2902,230

3,7603,6403,5303,4303,330

7,2407,0106,8006,6006,420

11,50011,20010,80010,50010,200

20,40019,80019,20018,60018,100

41,60040,30039,10037,90036,900

1,1001,2001,3001,4001,500

261249239229221

546521499480462

1,030982940903870

2,1102,0201,9301,8501,790

3,1703,0202,8902,7802,680

6,1005,8205,5705,3505,160

9,7209,2708,8808,5308,220

17,20016,40015,70015,10014,500

35,00033,40032,00030,80029,600

1,6001,7001,8001,9002,000

213206200194189

446432419407395

840813789766745

1,7301,6701,6201,5701,530

2,5902,5002,4302,3602,290

4,9804,8204,6704,5404,410

7,9407,6807,4507,2307,030

14,00013,60013,20012,80012,400

28,60027,70026,90026,10025,400

Table 12-29Schedule 40 Metallic Pipe [NFPA 54-09: Table 6.3(a)]

Note: All table entries are rounded to 3 significant digits.

Table 12-29 IDAHO STATE PLUMBING CODE

206

READ ONLY

READ ONLY

Gas: Undiluted Propane

Inlet Pressure: 10.0 psi

Pressure Drop: 3.0 psi

Specific Gravity: 1.50

INTENDED USE: Pipe Sizing Between First Stage (High Pressure Regulator) and Second Stage (Low Pressure Regulator).

Pipe Size (in.)

Nominal

Inside:1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

5,8904,0503,2502,7802,460

12,3008,4606,7905,8105,150

23,20015,90012,80011,0009,710

47,60032,70026,30022,50019,900

71,30049,00039,40033,70029,900

137,00094,40075,80064,90057,500

219,000150,000121,000103,00091,600

387,000266,000214,000183,000162,000

789,000543,000436,000373,000330,000

60708090

100

2,2302,0501,9101,7901,690

4,6704,3004,0003,7503,540

8,7908,0907,5307,0606,670

18,10016,60015,50014,50013,700

27,10024,90023,20021,70020,500

52,10047,90044,60041,80039,500

83,00076,40071,10066,70063,000

147,000135,000126,000118,000111,000

299,000275,000256,000240,000227,000

125150175200250

1,5001,3601,2501,1601,030

3,1402,8402,6202,4302,160

5,9105,3604,9304,5804,060

12,10011,00010,1009,4108,340

18,20016,50015,20014,10012,500

35,00031,70029,20027,20024,100

55,80050,60046,50043,30038,400

98,70089,40082,30076,50067,800

201,000182,000167,800156,100138,400

300350400450500

935860800751709

1,9501,8001,6701,5701,480

3,6803,3903,1502,9602,790

7,5606,9506,4706,0705,730

11,30010,4009,6909,0908,590

21,80020,10018,70017,50016,500

34,80032,00029,80027,90026,400

61,50056,50052,60049,40046,600

125,400115,300107,300100,70095,100

550600650700750

673642615591569

1,4101,3401,2901,2401,190

2,6502,5302,4202,3302,240

5,4505,2004,9804,7804,600

8,1607,7807,4507,1606,900

15,70015,00014,40013,80013,300

25,00023,90022,90022,00021,200

44,30042,20040,50038,90037,400

90,30086,20082,50079,30076,400

800850900950

1,000

550532516501487

1,1501,1101,0801,0501,020

2,1702,1002,0301,9701,920

4,4504,3004,1704,0503,940

6,6606,4506,2506,0705,900

12,80012,40012,00011,70011,400

20,50019,80019,20018,60018,100

36,20035,00033,90032,90032,000

73,70071,40069,20067,20065,400

1,1001,2001,3001,4001,500

463442423406391

968923884849818

1,8201,7401,6701,6001,540

3,7403,5703,4203,2803,160

5,6105,3505,1204,9204,740

10,80010,3009,8709,4809,130

17,20016,40015,70015,10014,600

30,40029,00027,80026,70025,700

62,10059,20056,70054,50052,500

1,6001,7001,8001,9002,000

378366355344335

790765741720700

1,4901,4401,4001,3601,320

3,0602,9602,8702,7802,710

4,5804,4304,3004,1704,060

8,8208,5308,2708,0407,820

14,10013,60013,20012,80012,500

24,80024,00023,30022,60022,000

50,70049,00047,60046,20044,900

Table 12-30Schedule 40 Metallic Pipe [NFPA 54-09: Table 6.3(b)]

Note: All table entries are rounded to 3 significant digits.

Table 12-30FUEL PIPING

207

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READ ONLY

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 (in.)

Nominal 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

2,6801,8401,4801,2601,120

5,5903,8503,0902,6402,340

10,5007,2405,8204,9804,410

21,60014,90011,90010,2009,060

32,40022,30017,90015,30013,600

62,40042,90034,50029,50026,100

99,50068,40054,90047,00041,700

176,000121,00097,10083,10073,700

359,000247,000198,000170,000150,000

60708090

100

1,010934869815770

2,1201,9501,8201,7001,610

4,0003,6803,4203,2103,030

8,2107,5507,0206,5906,230

12,30011,30010,5009,8809,330

23,70021,80020,30019,00018,000

37,70034,70032,30030,30028,600

66,70061,40057,10053,60050,600

136,000125,000116,000109,000103,000

125150175200250

682618569529469

1,4301,2901,1901,110

981

2,6902,4402,2402,0801,850

5,5205,0004,6004,2803,790

8,2707,4906,8906,4105,680

15,90014,40013,30012,30010,900

25,40023,00021,20019,70017,400

44,90040,70037,40034,80030,800

91,50082,90076,30071,00062,900

300350400450500

425391364341322

889817760714674

1,6701,5401,4301,3401,270

3,4403,1602,9402,7602,610

5,1504,7404,4104,1303,910

9,9209,1208,4907,9607,520

15,80014,50013,50012,70012,000

27,90025,70023,90022,40021,200

57,00052,40048,80045,80043,200

550600650700750

306292280269259

640611585562541

1,2101,1501,1001,0601,020

2,4802,3602,2602,1702,090

3,7103,5403,3903,2603,140

7,1406,8206,5306,2706,040

11,40010,90010,4009,9909,630

20,10019,20018,40017,70017,000

41,10039,20037,50036,00034,700

800850900950

1,000

250242235228222

523506490476463

985953924897873

2,0201,9601,9001,8401,790

3,0302,9302,8402,7602,680

5,8305,6405,4705,3105,170

9,3009,0008,7208,4708,240

16,40015,90015,40015,00014,600

33,50032,40031,50030,50029,700

1,1001,2001,3001,4001,500

210201192185178

440420402386372

829791757727701

1,7001,6201,5501,4901,440

2,5502,4302,3302,2402,160

4,9104,6804,4904,3104,150

7,8307,4707,1506,8706,620

13,80013,20012,60012,10011,700

28,20026,90025,80024,80023,900

1,6001,7001,8001,9002,000

172166161157152

359348337327318

677655635617600

1,3901,3401,3001,2701,230

2,0802,0101,9501,9001,840

4,0103,8803,7603,6503,550

6,3906,1806,0005,8205,660

11,30010,90010,60010,30010,000

23,00022,30021,60021,00020,400

Table 12-31Schedule 40 Metallic Pipe [NFPA 54-09: Table 6.3(c)]

Note: All table entries are rounded to 3 significant digits.

Table 12-31 IDAHO STATE PLUMBING CODE

208

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READ ONLY

Gas: Undiluted Propane

Inlet Pressure: 11.0 in. w.c.

Pressure Drop: 0.5 in. w.c.

Specific Gravity: 1.50

INTENDED USE: Pipe Sizing Between Single or Second Stage (Low Pressure Regulator) and Appliance

Pipe Size (in.)

Nominal

Inside:1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 4

Actual ID: 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

291200160137122

608418336287255

1,150787632541480

2,3501,6201,3001,110

985

3,5202,4201,9401,6601,480

6,7904,6603,7503,2102,840

10,8007,4305,9705,1104,530

19,10013,10010,6009,0308,000

39,00026,80021,50018,40016,300

6080

100125150

110101948984

231212197185175

434400372349330

892821763716677

1,3401,2301,1401,0701,010

2,5702,3702,2002,0701,950

4,1003,7703,5103,2903,110

7,2506,6706,2105,8205,500

14,80013,60012,70011,90011,200

175200250300350

7467625851

155140129120107

292265243227201

600543500465412

899814749697618

1,7301,5701,4401,3401,190

2,7602,5002,3002,1401,900

4,8804,4204,0603,7803,350

9,9509,0108,2907,7106,840

400450500550600

4642403735

9789837873

182167156146138

373344320300283

560515479449424

1,080991922865817

1,7201,5801,4701,3801,300

3,0402,7902,6002,4402,300

6,1905,7005,3004,9704,700

650700750800850

3332302928

7066646159

131125120115111

269257246236227

403385368354341

776741709681656

1,2401,1801,1301,0901,050

2,1902,0902,0001,9201,850

4,4604,2604,0803,9203,770

900950

1,0001,1001,200

2726252524

5755535250

1071041009795

220213206200195

329319309300292

634613595578562

1,010978948921895

1,7901,7301,6801,6301,580

3,6403,5303,4203,3203,230

1,3001,4001,5001,6001,700

2322212019

4846444240

9086827976

185176169162156

277264253243234

534509487468451

850811777746719

1,5001,4301,3701,3201,270

3,0702,9302,8002,6902,590

1,8001,9002,000

191818

393837

747169

151146142

226219212

436422409

694672652

1,2301,1901,150

2,5002,4202,350

Table 12-32Schedule 40 Metallic Pipe [NFPA 54-09: Table 6.3(d)]

Note: All table entries are rounded to 3 significant digits.

Table 12-32FUEL PIPING

209

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READ ONLY

Table 12-33Semi-Rigid Copper Tubing [NFPA 54-09: Table 6.3(e)]

Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

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 (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

513352283242215

1,060727584500443

2,1501,4801,1901,020

901

3,7602,5802,0801,7801,570

5,3303,6702,9402,5202,230

11,4007,8306,2905,3804,770

20,50014,10011,3009,6908,590

32,30022,20017,90015,30013,500

67,40046,30037,20031,80028,200

60708090

100

194179166156147

401369343322304

816751699655619

1,4301,3101,2201,1501,080

2,0201,8601,7301,6301,540

4,3203,9803,7003,4703,280

7,7807,1606,6606,2505,900

12,30011,30010,5009,8509,310

25,60023,50021,90020,50019,400

125150175200250

13111810910190

270244225209185

549497457426377

959869799744659

1,3601,2301,1301,060

935

2,9102,6302,4202,2502,000

5,2304,7404,3604,0603,600

8,2507,4706,8806,4005,670

17,20015,60014,30013,30011,800

300350400450500

8175706562

168155144135127

342314292274259

597549511480453

847779725680643

1,8101,6601,5501,4501,370

3,2603,0002,7902,6202,470

5,1404,7304,4004,1303,900

10,7009,8409,1608,5908,120

550600650700750

5956545150

121115111106102

246235225216208

430410393378364

610582558536516

1,3001,2401,1901,1401,100

2,3502,2402,1402,0601,980

3,7003,5303,3803,2503,130

7,7107,3507,0406,7706,520

800850900950

1,000

4846454442

9996939088

201195189183178

351340330320311

498482468454442

1,0601,0301,000

970944

1,9201,8501,8001,7501,700

3,0202,9202,8402,7502,680

6,2906,0905,9105,7305,580

1,1001,2001,3001,4001,500

4038373534

8379767370

169161155148143

296282270260250

420400383368355

896855819787758

1,6101,5401,4701,4201,360

2,5402,4302,3202,2302,150

5,3005,0504,8404,6504,480

1,6001,7001,8001,9002,000

3332313029

6866646260

138134130126122

241234227220214

343331321312304

732708687667648

1,3201,2701,2401,2001,170

2,0802,0101,9501,8901,840

4,3304,1904,0603,9403,830

Table 12-33 IDAHO STATE PLUMBING CODE

210

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Table 12-34Semi-Rigid Copper Tubing [NFPA 54-09: Table 6.3(f)]

NA means a flow of less than 10,000 Btu/hr.Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

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 (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

4531252119

9364514439

1881291048979

329226182155138

467321258220195

997685550471417

1,8001,230

991848752

2,8301,9501,5601,3401,180

5,8904,0503,2502,7802,470

60708090

100

1716151413

3532302827

7166615754

12511510710095

177163152142134

378348324304287

681626583547517

1,070988919862814

2,2402,0601,9101,8001,700

125150175200250

1110

NANANA

2421201816

4844403733

8476706558

119108999282

254230212197175

458415382355315

722654602560496

1,5001,3601,2501,1701,030

300350400450500

NANANANANA

1514131211

3028262423

5248454240

7468636056

158146136127120

285262244229216

449414385361341

936861801752710

550600650700750

NANANANANA

1110

NANANA

2221201918

3836343332

5351494745

11410910410096

205196188180174

324309296284274

674643616592570

800850900950

1,000

NANANANANA

NANANANANA

1817171616

3130292827

4442414039

9390878583

168162157153149

264256248241234

551533517502488

1,1001,2001,3001,4001,500

NANANANANA

NANANANANA

1514141313

2625242322

3735343231

7875726966

141135129124119

223212203195188

464442423407392

1,6001,7001,8001,9002,000

NANANANANA

NANANANANA

1212111111

2120201919

3029282727

6462605857

115112108105102

182176170166161

378366355345335

Table 12-34FUEL PIPING

211

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Table 12-35Semi-Rigid Copper Tubing [NFPA 54-09: Table 6.3(g)]

Note: All table entries are rounded to 3 significant digits.*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

Gas: Undiluted Propane

Inlet Pressure: 2.0 psi

Pressure Drop: 1.0 psi

Specific Gravity: 1.50

INTENDED USE: Tube Sizing Between 2 psig Service and Line Pressure Regulator

Tube Size (in.)

Nominal:K & L: 1/4 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2

ACR: 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 – –

Outside: 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125

Inside:* 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959

Length (ft.) Capacity in Thousands of Btu per Hour

1020304050

413284228195173

852585470402356

1,7301,190

956818725

3,0302,0801,6701,4301,270

4,3002,9502,3702,0301,800

9,1706,3105,0604,3303,840

16,50011,4009,1207,8006,920

26,00017,90014,40012,30010,900

54,20037,30029,90025,60022,700

60708090

100

157144134126119

323297276259245

657605562528498

1,1501,060

983922871

1,6301,5001,3901,3101,240

3,4803,2002,9802,7902,640

6,2705,7605,3605,0304,750

9,8809,0908,4507,9307,490

20,60018,90017,60016,50015,600

125150175200250

10595888272

217197181168149

442400368343304

772700644599531

1,100992913849753

2,3402,1201,9501,8101,610

4,2103,8203,5103,2702,900

6,6406,0205,5405,1504,560

13,80012,50011,50010,7009,510

300350400450500

6660565350

135124116109103

275253235221209

481442411386365

682628584548517

1,4601,3401,2501,1701,110

2,6202,4102,2502,1101,990

4,1403,8003,5403,3203,140

8,6107,9207,3706,9206,530

550600650700750

4745434140

9793898682

198189181174168

346330316304293

491469449431415

1,0501,000

959921888

1,8901,8001,7301,6601,600

2,9802,8402,7202,6202,520

6,2105,9205,6705,4505,250

800850900950

1,000

3937363534

8077757271

162157152147143

283274265258251

401388376366356

857829804781760

1,5401,4901,4501,4101,370

2,4302,3502,2802,2202,160

5,0704,9004,7504,6204,490

1,1001,2001,3001,4001,500

3231302827

6764615957

136130124120115

238227217209201

338322309296286

721688659633610

1,3001,2401,1901,1401,100

2,0501,9501,8701,8001,730

4,2704,0703,9003,7403,610

1,6001,7001,8001,9002,000

2626252423

5553515048

11110810410199

194188182177172

276267259251244

589570553537522

1,0601,0301,000

966940

1,6701,6201,5701,5201,480

3,4803,3703,2703,1703,090

Table 12-35 IDAHO STATE PLUMBING CODE

212

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Table 12-36Corrugated Stainless Steel Tubing (CSST) [NFPA 54-09: Table 6.3(h)]

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.Notes:(1) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased

by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additionalfittings and/or bends.

(2) All table entries are rounded to 3 significant digits.

Table 12-37Corrugated Stainless Steel Tubing (CSST) [NFPA 54-09: Table 6.3(i)]

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)*

Flow Designation: 13 15 18 19 23 25 30 31 37 39 46 48 60 62

Length (ft) Capacity in Thousands of Btu per Hour

5101520

72503934

99695549

18112910491

211150121106

355254208183

426303248216

744521422365

863605490425

1,420971775661

1,6381,179

972847

2,8301,9901,6201,400

3,2702,3201,9001,650

5,7804,1103,3702,930

6,5504,6403,7903,290

25304050

30282320

42393330

82746458

94877466

164151131118

192177153137

325297256227

379344297265

583528449397

762698610548

1,2501,140

988884

1,4801,3501,1701,050

2,6302,4002,0901,870

2,9402,6802,3302,080

60708090

19171515

26252322

53494544

60575250

107999490

126117109102

207191178169

241222208197

359330307286

502466438414

805745696656

961890833787

1,7101,5901,4901,400

1,9001,7601,6501,550

100150200250300

1411988

2015141211

4131282523

4736333026

8566605350

9875696157

1591231129990

186143129117107

270217183163147

393324283254234

621506438390357

746611531476434

1,3301,090

948850777

1,4801,2101,050

934854

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)*

Flow Designation: 13 15 18 19 23 25 30 31 37 39 46 48 60 62

Length (ft) Capacity in Thousands of Btu per Hour

1025304050

426262238203181

558347316271243

927591540469420

1,110701640554496

1,7401,1201,030

896806

2,1701,3801,2701,100

986

4,1002,5602,3302,0101,790

4,7202,9502,6902,3202,070

7,1304,5604,1803,6303,260

7,9585,1474,7194,1163,702

15,2009,5508,7107,5306,730

16,80010,7009,7908,5007,610

29,40018,80017,20014,90013,400

34,20021,70019,80017,20015,400

7580

100150200

14714012410186

196189169137118

344333298245213

406393350287248

663643578477415

809768703575501

1,4601,4101,2601,020

880

1,6901,6301,4501,1801,020

2,6802,5902,3301,9101,660

3,0532,9612,6622,1951,915

5,4805,3004,7403,8603,340

6,2306,0405,4104,4303,840

11,00010,6009,5307,8106,780

12,60012,20010,9008,8907,710

250300400500

77696053

105968272

191173151135

222203175158

373343298268

448411355319

785716616550

910829716638

1,4901,3601,1601,030

1,7221,5781,3761,237

2,9802,7202,3502,100

3,4403,1502,7302,450

6,0805,5604,8304,330

6,9006,3005,4604,880

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.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 regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator mayvary with flow rate.

(2) CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for guidance.(3) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an

equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additional fittingsand/or bends.

(4) All table entries are rounded to 3 significant digits.

Table 12-36 – Table 12-37FUEL PIPING

213

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Table 12-38Corrugated Stainless Steel Tubing (CSST) [NFPA 54-09: Table 6.3(j)]

Gas: Undiluted Propane

Inlet Pressure: 5.0 psi

Pressure Drop: 3.5 psi

Specific Gravity: 1.50

Tube Size (EHD)*

Flow Designation: 13 15 18 19 23 25 30 31 37 39 46 48 60 62

Length (ft) Capacity in Thousands of Btu per Hour

1025304050

826509461396352

1,070664603520463

1,7101,090

999867777

2,0601,3101,1901,030

926

3,1502,0401,8701,6301,460

4,0002,5502,3402,0301,820

7,8304,8604,4303,8203,410

8,9505,6005,1004,4003,930

13,1008,4007,6806,6805,990

14,4419,3398,5647,4696,717

28,60018,00016,40014,20012,700

31,20019,90018,20015,80014,100

54,40034,70031,70027,60024,700

63,80040,40036,90032,00028,600

7580

100150200

284275243196169

376363324262226

637618553453393

757731656535464

1,2101,1701,050

866755

1,4901,4501,3001,060

923

2,7702,6802,3901,9401,680

3,1903,0902,7602,2401,930

4,9204,7704,2803,5103,050

5,5395,3724,8303,9833,474

10,3009,9908,9307,2706,290

11,60011,20010,0008,2107,130

20,30019,60017,60014,40012,500

23,40022,70020,30016,60014,400

250300400500

150136117104

202183158140

352322279251

415379328294

679622542488

828757657589

1,4901,3601,1701,050

1,7301,5701,3601,210

2,7402,5102,1801,950

3,1242,8652,4982,247

5,6205,1204,4303,960

6,3905,8405,0704,540

11,20010,3008,9208,000

12,90011,70010,2009,110

*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value ofEHD, the greater the gas capacity of the tubing.Notes:(1) Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 1 psi, do not use this table. Consult with regu-

lator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.(2) CAUTION: Capacities shown in table may exceed maximum capacity for a selected regulator. Consult with regulator or tubing manufacturer for

guidance.(3) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an

equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (ft) of tubing and n is the number of additional fittingsand/or bends.

(4) All table entries are rounded to 3 significant digits.

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 2-Stage Regulator at Tank or 2nd Stage (Low Pressure Regulator) and Building

Pipe Size (in.)

Nominal OD: 1/2 3/4 1 1-1/4 1-1/2 2

Designation: SDR 9.33 SDR 11.0 SDR 11.00 SDR 10.00 SDR 11.00 SDR 11.00

Actual ID: 0.660 0.860 1.077 1.328 1.554 1.943

Length (ft) Capacity in Thousands of Btu per Hour

1020304050

340233187160142

680468375321285

1,230844677580514

2,1301,4601,1701,000

890

3,2102,2101,7701,5201,340

5,7703,9703,1802,7302,420

60708090

100

12911911010398

258237221207196

466428398374353

807742690648612

1,2201,1201,040

978924

2,1902,0101,8701,7601,660

125150175200250

8778726760

173157145135119

313284261243215

542491452420373

819742683635563

1,4701,3301,2301,1401,010

300350400450500

5450464341

10899928782

195179167157148

338311289271256

510469436409387

916843784736695

Table 12-39Polyethylene Plastic Pipe [NFPA 54-09: Table 6.3(k)]

Note: All table entries are rounded to 3 significant digits.

Table 12-38 – Table 12-39 IDAHO STATE PLUMBING CODE

214

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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 and Line Pressure Regulator

Pipe Size (in.)

Nominal OD: 1/2 3/4 1 1-1/4 1-1/2 2

Designation: SDR 9.33 SDR 11.0 SDR 11.00 SDR 10.00 SDR 11.00 SDR 11.00

Actual ID: 0.660 0.860 1.077 1.328 1.554 1.943

Length (ft) Capacity in Thousands of Btu per Hour

1020304050

3,1302,1501,7301,4801,310

6,2604,3003,4502,9602,620

11,3007,7606,2305,3304,730

19,60013,40010,8009,2408,190

29,50020,30016,30014,00012,400

53,10036,50029,30025,10022,200

60708090

100

1,1901,0901,010

952899

2,3702,1802,0301,9101,800

4,2803,9403,6703,4403,250

7,4206,8306,3505,9605,630

11,20010,3009,5909,0008,500

20,10018,50017,20016,20015,300

125150175200250

797722664618548

1,6001,4501,3301,2401,100

2,8802,6102,4002,2301,980

4,9904,5204,1603,8703,430

7,5306,8306,2805,8405,180

13,50012,30011,30010,5009,300

300350400450500

496457425399377

994914851798754

1,7901,6501,5301,4401,360

3,1102,8602,6602,5002,360

4,6904,3204,0203,7703,560

8,4307,7607,2206,7706,390

550600650700750

358341327314302

716683654628605

1,2901,2301,1801,1301,090

2,2402,1402,0401,9601,890

3,3803,2203,0902,9702,860

6,0705,7905,5505,3305,140

800850900950

1,000

292283274266259

585566549533518

1,0501,020

990961935

1,8301,7701,7101,6701,620

2,7602,6702,5902,5202,450

4,9604,8004,6504,5204,400

1,1001,2001,3001,4001,500

246234225216208

492470450432416

888847811779751

1,5401,4701,4101,3501,300

2,3202,2202,1202,0401,960

4,1703,9803,8103,6603,530

1,6001,7001,8001,9002,000

201194188183178

402389377366356

725702680661643

1,2601,2201,1801,1401,110

1,9001,8401,7801,7301,680

3,4103,3003,2003,1103,020

Table 12-40Polyethylene Plastic Pipe [NFPA 54-09: Table 6.3(l)]

Note: All table entries are rounded to 3 significant digits.

Table 12-40FUEL PIPING

215

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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

2-Stage Regulator at Tank or Second Stage (Low Pressure

Regulator) and Building.

Plastic Tubing Size (CTS) (in.)

Nominal OD: 1/2 1

Designation: SDR 7.00 SDR 11.00

Actual ID: 0.445 0.927

Length (ft) Capacity in Thousands of Btu per Hour

1020304050

12183675751

828569457391347

60708090

100

4642393735

314289269252238

125150175200

31282624

211191176164

225250275300

22212019

154145138132

350400450500

18161515

121113106100

Table 12-41Polyethylene Plastic Tubing [NFPA 54-09: Table 6.3(m)]

Note: All table entries are rounded to 3 significant digits.

Table 12-41 IDAHO STATE PLUMBING CODE

216

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READ ONLY