nfpa 54 gas pipe sizing chart

.zTjDi)e/Rmn@xYdOpFa4V*l!V0x!5xKYg%thkyXoG#u0`~-|,j:n2?^ )R$V/Fa ,F They also can be a fire hazard. Refer to section 1.1.1.2 of the NFPA 54 Fuel Gas Code for a list of applications NFPA 54 does not cover. NFPA 54, Annex E Flow of Gas through Fixed Orifices. IFGC Chapter 8 Referenced Standards. 0 stream HWmoNa?E))V`$but,I= r3+nnX BVi %PDF-1.6 % Most mechanical codes have pressure limitations of 5 psi in a building. The plastic pipe tests allow the same plastic pipe to be tested and listed for this application and the price is much higher for basically the same product except a sticker. /Range[0 1] 7 0 obj <> endobj An existing gas appliance installation is required to be inspected for combustion air and venting code compliance when the building structure that it is installed in is modified with specific air infiltration-reducing changes. NFPA 54, Chapter 7 Gas Piping Installations. >-x&,m`t'_v2NG1=re3fF%c0K_Gf?['YdfGI0.JF#c$x6- $"BJMkrp\S4 Knowing the caloric value of the fuel gas can help with pipe sizing. /Width 500 30 0 obj <>/Filter/FlateDecode/ID[<0397F9F983370743A1C7609D43F997CB><6CCE55729FC58E47818C29CEEDFE9C24>]/Index[11 34]/Info 10 0 R/Length 95/Prev 54632/Root 12 0 R/Size 45/Type/XRef/W[1 2 1]>>stream endobj The manufacturers instructions should have the clearance information. 9#NIy[? C..r U5V7 Bo|?D@A@Kb6hCWq}/r/sWg]5k#xx>Jv]9j(j=x,*[T/*o,o H\Kk0:&*< >hFqxB As with all codes, it is important to determine which code edition applies in a given jurisdiction for a given time period. /Subtype/Image Plastic flue gas piping is now approved if it meets the tests in this new standard. 3 0 obj O uz%:Q5D50yJ[Zyyh@s!9>[A-+OZCxRB9s0p\PP U`%~CPk6lB=!r?,zkA`PPG Qo endstream endobj 106 0 obj <>>> endobj 107 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/Shading<>/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 108 0 obj <>stream %PDF-1.5 % There was not an approved standard for plastic pipe in the United States, so some manufacturers of plastic pipe went to a standard developer and asked to have a standard developed to address plastic piping for flue gas venting. The general requirements found in previous Chapters 1 through 5 also apply. The format of the IFGC allows each chapter to be devoted to a particular subject, except for Chapter 3, which contains general subject matters not extensive enough to warrant their own independent chapter. 3. 5v5jvu`w;usw[izo}(y,M6:7oLw$f>7A/UZc p}=^M6SF}UQ2 #u\?I~5xC9kr)9gsl \, The provisions of this chapter are intended to minimize the hazards associated with high temperatures and potentially toxic and corrosive combustion gases. endobj Aqc 6S%&{?2 32TX|$ci#$o00=@wBr KQ S4 endstream endobj 38 0 obj <>>> endobj 39 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text]/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 40 0 obj <>stream In 1980, portions of the ASME B31.2 piping code were included. 4 0 obj Fuel gas systems can be a safe and economical choice for space heating, water heating or process applications if designed, installed and maintained properly. NFPA 54, Annex K Informational References. It also covers pressure regulators, appliance connections and overpressure protection devices. or 8 oz. The specific gravity of butane is 1.95, which is much heavier than air. R"n_*^N5ao8%n'Qt jD3dA&D4/sk!9T28r&;;Z]A9XuR,5}ol&._tLZmxasU(:.q9n/IlRc[cw`0+!W|'k?P%i*cT'i=~-h1t tN~sx=xp { |j6E")oAP6_0\6C=)HO /Length 34 The pressures are high to move large quantities of gas through a relatively small pipe. /Length 16816 Propane and butane are often supplied in high-pressure liquid cylinders and at lower pressures will be in a gaseous state. Propane use is common in rural areas and has 2,500 BTUs/cubic ft. 2. The fuel gas codes have a section on approved materials for fuel gas pipe, valves and fittings. Properly designed chimneys, vents and venting systems are necessary to conduct to the outdoors the flue gases produced by the combustion of fuels in appliances. endobj ?`q(>%h:++mM0cTPIVVy: The second worker was severely burned by a ball of fire that emitted from the inspection port when he opened the inspection port sight glass door blackened with soot because of the rich flame condition. A simple cap or plug can prevent a disaster. Fuel gas pressures vary by the type of gas being used. >> 20 0 obj <>/Filter/FlateDecode/ID[<3E097BD0C2A6BA469EF6226704E090F8><35D24E8CB52A3845B91A12206F5A0F6C>]/Index[7 24]/Info 6 0 R/Length 74/Prev 48061/Root 8 0 R/Size 31/Type/XRef/W[1 2 1]>>stream The scope of Chapter 7 is not limited to any particular use of hydrogen (see Sections 633 and 635). /OPM 1 Where there are sources of high-voltage electricity outside the piping system that could energize the gas piping system (highly unusual or unlikely). [/Separation/Black/DeviceGray 3 0 R] The flammability range of propane is from approximately 2.1 percent to I0.1 percent volume in air. The problem is the flue gas temperatures can easily exceed the temperature rating of the plastic pipe materials if the heat exchanger fouls on the fuel burning equipment. endstream endobj 15 0 obj <>stream The code often uses terms having a unique meaning; the meaning can differ substantially from the ordinarily understood meaning of the term as used outside of the code. Shortly after the International Code Council was formed, it produced an International Fuel Gas Code. Maintenance man No. IFGC Chapter 4 Gas Piping Installations. The other model fuel gas code is the 2018 edition of the NFPA 54 National Fuel Gas Code, developed and maintained in a three-year revision cycle by the National Fire Protection Association (NFPA). of the fuel gas required for the application. /OP true Over the years, fuel gas systems have been installed in accordance with various model fuel gas codes and various editions of the model or local codes. That means natural gas is lighter than air and will dissipate when released into the atmosphere. This chapter covers piping plans, a provision for location of the point of delivery, interconnections between gas piping systems, sizing of gas piping systems, operating pressure, acceptable piping materials and joining methods, gas meters, gas pressure regulators, overpressure protection devices, backpressure protection, low-pressure protection, shut-off valves, excess flow valves, and expansion and flexibility. For example, if a pipe had a connected load that required 200,000 BTUs per hour, it would be a demand of 200 CFH. HWM 0Skb nXY;e}(T*a1H|$az`N(Oo~C2d`$ Natural gas pressures are expressed in several different ways. The minimum allowed wall thickness of carbon and stainless-steel pipe is revised to Schedule 10; however, joints on Schedule 10 pipe cannot be made with screwed fittings. NFPA 54, Chapter 1 Administration. This appendix is informative and not part of the code. Gas piping does not require a separate bonding connection unless one of the following situations occurs: Where there are gas appliances with electrical connections that are connected to ungrounded wiring systems (i.e., two-pronged plugs). Some local codes have addressed this by not allowing fuel gases that are heavier than air in basements. The applicable codes should be identified on the project drawings or in the specification manual. hbbd``b`J@H0o@/Dq i]&L@00Cg oM The chapter covers the allowable materials for gas piping systems and the sizing and installation of such systems. The specific gravity of propane is 1.52. Before 1974, the contents of NFPA 54 appeared in several other documents; in 1974, they were combined into one document. Gas piping installations where the pipe enters the building below grade have been responsible for many building explosions and fires. Butane and mixed gases are less common fuel gases but found occasionally. Butane has a BTU content of approximately 3,200 BTUs/cubic ft. s*>c0xq,}9}q3q9)_{V` 2 endstream endobj 110 0 obj <>stream SWg!hu[JxN[L|Yr ejoG%VSlOSpkkKiZ gW U_Hy$~iW|_ endstream endobj 109 0 obj <>stream Typically, in low-pressure piping systems, a lubricated gas cock is used. Butane is not as common as propane and is used mostly in rural areas. Typically, the total developed length of pipe is determined from the gas piping regulator to the farthest piece of equipment. The National Fuel Gas Code (NFPA 54) is the oldest fuel gas code in the United States. I have consulted on many fuel gas explosions where purging operations were conducted on new piping that had experienced odor fade because the gas had been in the pipe for an extended period. The caloric value helps to determine the cubic ft./hr. C@bLU It provides recommended procedures for testing and inspecting an appliance installation to determine if the installation is operating safely and if the appliance is in a safe condition. This chapter covers some general equipment and accessory requirements, accessibility and clearance requirements, air for combustion and ventilation, appliances on roofs, appliances in attics, appliance and equipment connections to building piping, electrical requirements and room temperature thermostat requirements. /Height 278 When using natural gas, the designer should determine the BTU requirements for each section of piping and divide by 1,000 BTUs/cubic ft. of gas to get the cubic ft./hr. The specific gravity of natural gas is 0.65, while air has a specific gravity of 1. NFPA 54, Chapter 5 Gas Piping System Design, Materials and Components. Chapter 8 provides the full title and edition year of the standards and codes, in addition to the address of the promulgators and the section numbers in which the standards and codes are referenced. IFGC Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation. NFPA 54, Chapter 12 Venting of Appliances. The local utility company typically buys gas from the market through transmission mains with a meter and regulator assembly to record the amount flowing. Sizing gas piping should be done in accordance with the sizing tables in the mechanical or gas code. >> (*9r!M(4Qc,hq1 }] of gas pressure. 1 0 obj AfvjUz. hb``d``g =Y8a3CpX.H*i!-zaa`&7@ W3 |ry\dLbT3+4tGIf [a.=@p @{t'@a0>@90*a 2 was called to investigate when the furnace did not light and factory workers were cold. In older East Coast cities that have old cast-iron gas main piping, the gas utility cannot provide pressures above 1/4 psi to 1/2 psi to the gas regulator because the older cast-iron pipe mains could rupture, crack or leak fuel gas. /Type/XObject The sections in Chapter 6 add the special requirements that are specific to each type of appliance. hb``b``jc`a`fg@ ~+s|``$$)v GGLO~$X .Dg^ @v@{nN }QEGNh; k ]9N>4`7Vy>99}oKeL^o5{MW=kb}Y}ss`t:N|B`'n+| 9Ai 5 0 obj They chose the developing a standard route rather than focusing on requiring temperature-limiting switches or flue gas temperature sensors for fuel gas appliances that want to use plastic flue pipe. Similar conversions for propane require dividing the connected load in BTUs in a given section of pipe by 2,500 for propane and 3,200 for a butane system to determine the CFH of fuel gas. B&.FC,k0a revQP{{N C#(jh67NHujP&xecT6. "X /$$@x($TTu V0d#'_ 9 If a gas appliance is not connected to the gas piping system, gas outlets that are not connected to appliances are required to be capped gas-tight. Hydrogen systems have unique potential hazards because of the specific gravity of the gas, its chemical effect on materials and the fact that it is not odorized. This appendix is informative and not part of the code. The provisions of Chapter 1 establish the authority and duties of the code official appointed by the authority having jurisdiction. This appendix is informative and not part of the code. NFPA 54, Annex C Suggested Method of Checking for Leakage. +.T It covers direct-vent appliances, integral-vent appliances, side-wall mechanically vented appliances and exhaust hoods that convey the combustion byproducts from cooking and other process appliances. Listed fuel-gas-burning appliances are required to have a label attached to the appliance describing required clearances. 37 0 obj <> endobj 64 0 obj <>/Filter/FlateDecode/ID[<288A4236DABC4289BE454707920657F9>]/Index[37 53]/Info 36 0 R/Length 120/Prev 196017/Root 38 0 R/Size 90/Type/XRef/W[1 3 1]>>stream ?.wnZ%93gf5i|>g[{ !-@FX]JW_OHqt ZzF;%tMC`Y!R3':j[AvKS{D=N/uRL]bssZBs-7g5ft}Njf$}gR3>l:]d'u,|E"}BV{b)c$YHB4\z~='cAQS~.ooz;,~WMQ?6vC7E! Check the fuel gas appliance manufacturers recommendations for minimum and maximum gas pressures for the equipment to operate properly. EkyL+R&K9(34%`.Zxv8}=.$JB7_x?Wp&=shH?ga(.Ji. In the United States, there are primarily two model fuel gas codes. Fuel gas piping is generally not allowed to enter a building below grade. During a maintenance check to get the furnace running, they noticed the combustion air pressure switch was not letting fuel into the combustion chamber (because the inlet filter was clogged), so maintenance worker No. %%EOF hb``f``Rb UiY8AG> Q : =Ih{J(,/Q&PBIkK0rX|{x]9VtS5)pmKsIqc$Uih.N_P}j For each chapter. We use cookies to provide you with a better experience. NFPA 54, Chapter 8 Inspecting, Testing and Purging. ? #;1B|uv(6M0FG}I13a"&6 a3i=LI$"L;z7hm"-}v8b(bLU8o5.!)4v,:)cJ;\;Lk,Lb3aE!5Acc:"3m LB$N1@C6nQdE'qI8f&9f,B3qN/bD;k&q"pOaL*?C^n rd098gzVSWNNj$Focc`''SYncv5m$&Iucx,f70)`tE96|} vm0gO y:44U:JCO@|uEzg NFPA 54, Chapter 11 Procedures to Be Followed to Place Appliance in Operation. X.q_(]u < The amount of combustion air required for propane is 25 cubic ft. of air for every cubic ft. of gas or 1 cubic ft. of air for every 100 BTUs. This code change has me concerned. yK_xO$E"!\H#D/" w `T=@((C Each main section applies to a unique type of gas-fired appliance and specifies the product standards to which the appliance must be listed. The following is a review of both codes. T&q0059W.PK u%G*/{og- C L;[ib>!vD@\A?:?rusN,}{:lSNhY,4JhjxknB9IRQ,Lc w.Vu* "f~ $ b/t;DV H)"$f0I: QL`6`D$Y0, "#`5wAx-q`R D4Hn6&`X q$du %%v endstream endobj startxref 0 %%EOF 206 0 obj <>stream %PDF-1.6 % IFGC Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems. uB-PK%g+0#p>Xb>,Yzf7o$Bn7+I3|C48@Z]oBW endstream endobj 41 0 obj <>stream The NFPA 54 is currently undergoing the final steps in a revision process for the 2021 edition. Webb Launches Remote Monitoring System for Fuel Dealers, Elkay Partners with 3M to Provide Filtered Water for 3M Open Attendees, APR Supply Co. President and CEO Scott Weaver Rides to End ALZ, SFPE Forum on Fire Protection Engineering: Challenges in Storage, IAPMO 93rd Annual Education and Business Conference. Where the gas piping material is CSST, NFPA 54 does not apply to portable LP-gas appliances and equipment of all types not connected to: a fixed-fuel piping system; LP gas installations at utility gas plants; fuel gas piping in electric utility power plants; gas piping, meters, gas pressure regulators and other appurtenances used by the serving gas supplier in distribution of gas, other than undiluted LP gas; or construction of appliances. At this point, it was a rich, sooty flame starved for air. A concentration of gas above 15 percent will generally not burn because the fuel-to-air ratio is too rich for combustion. It is heavier than air and will pool on the ground or in low places such as a basement when released into the atmosphere. The pressure often is reduced to about 1/2 psi or 14 in. There can be variances if large industrial boilers, furnaces or other equipment require higher pressures to operate. This chapter covers general appliance requirements, and requirements for a long list of different appliances. O)CmQ{;]S11?2EJ4' K{ As you can see, there are several chapters in the NFPA 54 not found in the IFGC. The International Association of Plumbing & Mechanical Officials struck a deal with the National Fire Protection Association to use the NFPA building code; they have been harmonizing the uniform codes with the NFPA 54 national fuel gas code over the last few code cycles. Gas piping systems are sized to supply the maximum demand while maintaining the supply pressure necessary for safe operation of the appliances served. wc or 8 oz. 105 0 obj <> endobj 154 0 obj <>/Filter/FlateDecode/ID[<25E480994A3345EC825AF9E95805AA4F>]/Index[105 102]/Info 104 0 R/Length 177/Prev 1093407/Root 106 0 R/Size 207/Type/XRef/W[1 3 1]>>stream endobj J+J+J4+Jt*J)lfL`oFW1x}f7{{-o}@?@?j/<3aS.T| Therefore, 1/2 lb. X EU It also covers compressed natural gas (CNG) for vehicle fuel systems, appliances for installation in manufactured housing, fuel-cell power plants and outdoor flame decorative appliances. IFGC Appendix A Sizing and Capacities of Gas Piping. The maintenance personnel had let the combustion air filter get clogged to the point where hardly any air could get into the combustion chamber. endstream endobj 12 0 obj <> endobj 13 0 obj <> endobj 14 0 obj <>stream When an installation fails, the plastic pipe will melt or collapse and cause a leak of combustion products that have been known to lead to carbon monoxide incidents. >> The 2018 International Fuel Gas Code (IFGC). h:YlFZJ~`3r9a[6*M2[>_4Yw:ey_#3\/IH#w0di:YV`;Tofmd=}RD7nd'LecN42uqWLh0+.GcWibQsxlC"#ma-t YKFj&YCkc{tH=6qNI{=T[))0-E_\rf>=UPWq5uv1cfD[<70{%)uu'U?J4 !PtIURNI2Ie@;WF-^=ng'TC#ySC(smdD4r|F\ca[ c0"d*AyyJoZ32Sc2C?RUfVH$j`L +;k8(l& I experienced this in a forensic investigation where a furnace not maintained properly would not fire properly. When soil around the fuel gas pipe shifts or settles, it creates a void along the pipe where gas leaks, far away from the building. It provides design guidance, useful facts and data, and multiple examples of how to apply the sizing tables and sizing methodologies of Chapter 4. % NFPA 54, Chapter 2 Referenced Publications. hb```a``f`c`hcf@ aPcM|/,u|N0>|\gnNu/pAEmynsf(x,zex The column for the next highest length in the sizing table should then be used to size the piping from the farthest outlet back to the pressure regulator, increasing in size for the additional CFH at each branch as required. This chapter covers minimum safe performance, general appliance venting requirements, specification of venting, design and construction, type of venting system to be used for positive or negative vent systems and for condensing vs. noncondensing vent systems. Note that hydrogen is not within the definition of fuel gas, but it is, nonetheless, commonly used as a fuel for fuel-cell power generation and fuel-cell-powered motor vehicles. Plastic flue gas venting materials were recently added to the fuel gas codes because many high-efficiency equipment manufacturers were utilizing plastic pipe instead of stainless-steel flue pipe. NFPA 54, Chapter 13 Sizing of Category 1 Venting Systems. /ColorSpace 4 0 R This chapter lists all the product and installation standards and codes referenced throughout Chapters 1 through 7. It also establishes the rights and privileges of the design professional, the contractor and the property owner. JEN0}g,mul:Q$spUHxmUjdLnRe5=V"BCC9be;2 BFMz>b`b$ ;k-xJ#Y|G%cBt"e,^-BP37W,|eF|X~iZHo[[%C{ex0~OT~ c? IFGC Chapter 5 Chimneys and Vents. Sizing tables. /Type/ExtGState hbbd```b`` d Like propane, butane will pool on the ground in low places and is subject to restriction in some codes. ~2b^^'(}6:4Wa[Vg33iI$z 1. Some jurisdictions using very old codes had the fuel gas and venting systems covered under various chapters in the old BOCA or Uniform Plumbing Code or Uniform Mechanical Code. This column covers the 2018 edition. The user of the code should know that terms defined in the code are generally italicized in the code text. This chapter covers pressure testing and inspection, piping system leak check and purging requirements. ?Wjfs BriD9 It can travel along the pipe and enter the basement or crawl space if not properly sealed. NFPA 54, Chapter 6 Pipe Sizing. (CFH) gas flow for each section of pipe. j_3_=>|L`DR $ -N I]~.?_@]w}O'wySLLGx%%d9%_>/UUEp0lp}2w/_1[ B8 It contains multiple examples of how to apply the vent and chimney tables and methodologies of Chapter 5. hTmo0+'V>KP&@QTCD Natural gas. A fuel gas code, like any other code, is intended to be adopted as a legally enforceable document and it cannot be effective without adequate provisions for its administration and enforcement. 44 0 obj <>stream With many recent fuel gas explosions and fires associated with fuel gas purging operations, NFPA 54 requires combustible gas detectors or indicators to be used when purging fuel gas lines or locating a leak during pressure testing of new or modified gas piping systems. << hkoJ(S&vJci,H9C)nH=SR&TCJBSSenJ>MOIjE5uI+YSU6U/QTURU8N{}B]*9z/Z?jrs^W*>;zrtP1v=|yrqkn~G^^WS_jOg&{gO'9y4/6'OWSwov?}~m^l_dxFwooKvNxo^^[<>>:M7oy?7GA,nlj* Nx59'gxzz~zq>=rTCwrFc}=^Znz>Vg/:2!37MXmM? << aVG--K)4NV KR@T/6U*z._ARc'>m|M IFGC Chapter 2 Definitions. It also covers fuel gas sizing equations. The orifices in the burner will be smaller for equipment using propane and even smaller for butane. The National Fuel Gas Code is the oldest model fuel gas code and it has undergone revisions and renumbering over many years. The text of NFPA 54 should be consulted for the complete language of these and other requirements. Press-connect fittings are now an acceptable joining method for fuel gas pipe. Low-pressure gas can be expressed in psi, inches of water column (wc) or ounces (oz) of pressure. IFGC Chapter 6 Specific Appliances. 6. IFGC Appendix B Sizing of Venting Systems Serving Appliances Equipped with Draft Hoods, Category I Appliances and Appliances Listed for Use with Type B Vents. The amount of combustion air required for natural gas is 10 cubic ft. of air for every cubic ft. of gas or 1 cubic ft. of air for every 100 BTUs. G0,%ZPWPK . Over the past 40 years, I have been involved with the design of fuel gas systems, inspection of fuel gas installations and investigation of fuel gas system explosions and fires that have led to the loss of life and property. aP|>y|(" w IFGC Chapter 7 Gaseous Hydrogen Systems. Propane also is a common fuel gas in rural areas where the gas delivery is in liquid form; it evaporates into the piping system at lower pressures. 8ud 68Y& 4~T-uo 6-)dK\Q d05&C&&Z!_o&g"IsZiJjS CE*B,^-Okc,Xs,@4xKbc@1;BAFIMxI^e j:=} }9.-ps)P_}xEoIX=\*|Ex \V@sc9:iJ5Kj>B4(CGh?8ZA endstream endobj 8 0 obj <> endobj 9 0 obj <>/MediaBox[0 0 612 792]/Parent 5 0 R/Resources<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/Rotate 0/Tabs/S/Type/Page>> endobj 10 0 obj <>stream This chapter covers pipe sizing methods, sizing of natural gas piping systems and sizing of propane piping systems. /FunctionType 4 The code does require components to be listed for the given application, so I understand how they chose this compliance path but the products are not any safer. 0l, Fuel gases include natural gas, propane, butane, methane, hydrogen and mixed gas es. Piping connections to equipment should have a gas shut-off valve with a dirt leg and a union for removal of the equipment. Gw:FPQ#0'*bm)I1t The 2018 NFPA 54 National Fuel Gas Code (NFPA 54). This chapter covers qualified agencies, interruption of service, prevention of accidental ignition and noncombustible material. After determining the CFH of gas for a section of pipe, using the appropriate gas pressure table and overall piping system length, professionals can select the pipe size from the tables in the code. Higher-pressure systems may use ball valves or other approved valves. stream Each plastic flue gas material has a different temperature rating or point where it starts to yield or melt. }T05oi^,gZ{-WXt&]lN[E^ !a"EU|N4YddwK cv_G6UQ_MyQFU6)e%>,;hCck[B" ZVG;:?dLfa6~qVn*)[P'6iVDav]H.t b2&[DSD3}rL1[9?2v]_:mm}2h;I=NgAf4/tA)u)7:B}Kw!tTTlWJ'z4 CdC @`iV{o8/_~8IBd/M_b_QiAx@`zLOq&s This chapter covers scope, purpose, retroactivity, equivalency and enforcement. Gas piping valves should be rated for the required pressure and have a fuel gas service rating. NFPA 54, Annex H Indoor Combustion Air Calculation Examples. The utility company will typically provide a gas regulator with the gas meter assembly at each service connection to reduce the pressure to the customer's desired pressure. Some local jurisdictions do not automatically adopt the latest version of the model code. These gases when designed, installed and maintained properly can provide a relatively clean-burning energy source for fuel-burning equipment such as generators, boilers, water heaters, furnaces, infrared heaters, cooking equipment, fireplaces and many other fuel-burning appliances. H\0$D+q 14R Q}}rT$1/#|vtZNmvutxn(]s4}Ciqerme\5M^~o.ont3Z&}=iI|+qAL}m?q8t-grZek?\vC,YzoVi9^q9y`sa[-2kK.G-_0%s=02+1r`{=~O4{GxGxGxGxGxGOA?6l~ NMV{m,h+i_;J{XADy{HI8cR2't DB2b2@As23' Butane. Some equipment manufacturers have added flue gas temperature-limit switches but it is not a requirement, and not all fuel-burning equipment has the limit switches. Chapter 2 is the repository of the definitions of terms used in the body of the code. NFPA 54, Annex A Explanatory Material. For a given project, the design professional should first determine if one of the above fuel gases is available to the site from a local utility or gas service provider several projects I have been involved with used methane gas captured from wells drilled in landfills to run electric generators. NFPA 54, Annex G Recommended Procedure for Safety Inspection of an Existing Appliance Installation. The odorant added by the gas utility had faded away and was not readily detectable by smell. The purging requirements are important for new installations that experience odor fade where the odorant (ethyl mercaptan) can dissipate to undetectable levels by smell. As stated in Section 102.8, these standards and codes become an enforceable part of the code (to the prescribed extent of the reference) as if printed in the body of the code. 7. The two model codes in the United States are the International Fuel Gas Code, which is administered by the International Code Council, and the NFPA 54 National Fuel Gas Code. Local jurisdictions may have adopted one of these model codes or provided their own code with a version of a model code with local amendments. )ZYX d1"`yZa(9t? wmTkm\=I>\ Over the years, many additions have been made to incorporate important safety requirements. hYmS8XZL I do not recommend plastic piping to be used on fuel-burning equipment unless the fuel gas appliance has a thermal-limit switch or flue gas temperature sensor built into the outlet flue connection of the equipment. This will shut off the fuel when the flue gas temperature reaches the temperature limit of the connected plastic flue pipe material, whatever the temperature/material may be. endstream endobj startxref This chapter covers adjusting the burner input, primary air adjustment, safety shut-off devices, automatic ignition, protective devices, checking the draft and operating instructions. It also covers masonry, metal and factory-built chimneys, gas vents, single-wall metal flue pipes, through-the-wall vent terminations, condensation drains for condensing flues, vent connectors for category 1 appliances, vent connections for category 2, 3 and 4 appliances, draft hoods and draft controls, manually operated dampers, automatically operated vent dampers and obstruction if appliance vents. Older construction methods allowed more infiltration that was factored into combustion air requirements. I have investigated many explosions and fires associated with uncapped gas lines that leaked fuel gas. gM#4dbKS73uQhei^^)*M&C#l?j >}8 r\t-=-%f (t16c,Pq_&A#6r>4 py9_j0z* 184F, ;!6Ff)-=-D*$lq'pAX+dF*y0hU_wEGcVP68hA#j *9& NFPA 54, Chapter 4 General. Around the time, the UPC and UMC had chapters covering fuel gas piping installations. 1 put a jumper wire across the safety switch contacts to get fuel into the combustion chamber. $.' Listed for use with Type B vents. 0 11 0 obj <> endobj o'"sIq HUn7}WS!1w>**UlZ-<886 /Domain[0 1] endstream endobj 11 0 obj <>stream hbbd```b``z"`@$ 0L`0L&Y&l +D*`]_- lNg [zK 2 endstream endobj startxref 0 %%EOF 89 0 obj <>stream One psi equals approximately 28 wc or 16 oz. NFPA 54, Chapter 10 Installation of Specific Appliances. kBeEtI.`UY+:j'b+M}+xV,.bYPyB3_T)5;=*&!YXpg }%4[WEwpCfy0Yb J/OB[J 4qb-}\(&c.7-ZUW]IA\^BV&+ *)f.}*#%jKSz(e+Mg1iEP!!H:!zybZhz3!P*2d\^2__EKIQ$r~v9fDw`Z 26s7A?yAi-tf#]If fsb-[3:2WeRxD_+d1SYnzjE{ ahvqSp"7ko=o]_V+, }d}X;ZZzCm. 4. This italicization helps the user become familiar with and consult the definitions chapter. Natural gas is typically piped from the gas fields to utility companies in high-pressure piping mains that can see pressures in the thousands of psi. Some industrial or heavy gas users may use up to 5 psi. This chapter covers general reference text, NFPA reference publications, other reference publications and references for extracts in mandatory sections. /SM 0.001 NFPA 54, Annex F Sizing of Venting Systems Serving Appliances Equipped with Draft Hoods, Category 1 Appliances and Appliances. This chapter contains broadly applicable requirements related to appliance location and installation, appliance and systems access, protection of structural elements and clearances to combustibles, among others.

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nfpa 54 gas pipe sizing chart

nfpa 54 gas pipe sizing chart

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