NFPA 50A氣態(tài)氫現(xiàn)場應用

NFPA50AStandardforGaseousHydrogenSystemsat

ConsumerSites氫氣系統(tǒng)用戶現(xiàn)場標準1999EditionCopyright?1999NFPA,AllRightsReservedThiseditionofNFPA50A,StandardforGaseousHydrogenSystemsatConsumerSites,waspreparedbytheTechnicalCommitteeonIndustrialandMedicalGasesandactedonbytheNationalFireProtectionAssociation,Inc.,atitsFallMeetingheldNovember16-18,1998,inAtlanta,GA.ItwasissuedbytheStandardsCouncilonJanuary15,1999,withaneffectivedateofFebruary4,1999,andsupersedesallpreviouseditions.Changesotherthaneditorialareindicatedbyaverticalruleinthemarginofthepagesonwhichtheyappear.Theselinesareincludedasanaidtotheuserinidentifyingchangesfromthepreviousedition.ThiseditionofNFPA50AwasapprovedasanAmericanNationalStandardonFebruary4,1999.OriginandDevelopmentofNFPA50ADevelopmentofNFPA50AwasinitiatedbytheCompressedGasAssociation,Inc.,whichsubmittedacompletetexttotheNFPACommitteeonGasesin1959.WorkingresponsibilityfortheprojectwasassignedtotheSectionalCommitteeonIndustrialGases,andthestandardwastentativelyadoptedattheAnnualMeetingin1961.Officialadoption,asNFPA567,followedatthe1963AnnualMeetingasrecommendedbytheCommitteeonGases.InJune1966,responsibilityforNFPA567wasreassignedtotheCommitteeonIndustrialandMedicalGases.Withthe1969edition,whichsupersededthe1963edition,thestandardwasredesignatedasNFPA50A.Subsequenteditionswereadoptedin1973,1978,1984,1989,and1994.TechnicalCommitteeonIndustrialandMedicalGasesCharlesB.Henrici,ChairRiverForestFireDept.,IL[E]Rep.Int’lAssn.ofFireChiefsWilliamH.Barlen,Airgas,CT[M]FrancisX.Bender,HazardsResearchCorp.,NJ[SE]CarlA.Caves,U.S.Dept.ofEnergy,MD[U]RickGinn,WrightBrothers,Inc.,OH[M]Rep.Nat’lWeldingSupplyAssn.DouglasF.Nelson,HSBIndustrialRiskInsurers,PA[I]JohnT.Pavlovcak,AirProducts&Chemicals,Inc.,PA[IM]Rep.CompressedGasAssn.,Inc.WilliamJ.Satterfield,III,RODE&Assoc.,LLC,CT[SE]SamirShiban,IntelCorp.,AZ[U]DavidN.Simon,AirLiquideAmericaCorp.,TX[IM]Rep.CompressedGasAssn.,Inc.MichaelW.St.Clair,OhioStateUniversity,OH[U]Rep.NFPAIndustrialFireProtectionSectionGaryF.Trojak,TheChlorineInst.,Inc.,DC[M]RandolphViscomi,ARCChemical,NY[IM]LionelWolpert,BOCGases,NJ[IM]Rep.CompressedGasAssn.,Inc.RobertA.Zeman,UnderwritersLaboratoriesInc.,IL[RT]AlternatesJohnAnicello,BOCGases,CA[IM](Alt.toL.Wolpert)MarshallIssen,UnderwritersLaboratoriesInc.,IL[RT](Alt.toR.A.Zeman)MichaelE.Lyden,TheChlorineInst.,Inc.,DC[M](Alt.toG.F.Trojak)AnthonyJ.McErlean,MesserGroup(MGIndustries),PA[IM](Alt.toD.N.Simon)RogerA.Smith,CompressedGasAssn.,Inc.,VA[IM](Alt.toJ.T.Pavlovcak)WilliamA.Thornberg,IndustrialRiskInsurers,CT[I](Alt.toD.F.Nelson)NonvotingWendellGlasier,U.S.Dept.ofLaborOSHA,DC[E](Alt.toJ.E.Slattery)FredK.Kitson,FKKitsonSafetyAssoc.,VA[SE]JoanneE.Slattery,U.S.Dept.ofLaborOSHA,DC[E]CarlRivkin,NFPAStaffLiaisonThislistrepresentsthemembershipatthetimetheCommitteewasballotedonthetextofthisedition.Sincethattime,changesinmembershipmayhaveoccurred.Akeytoclassificationsisfoundatthebackofthisdocument.NOTE:MembershiponacommitteeshallnotinandofitselfconstituteanendorsementoftheAssociationoranydocumentdevelopedbythecommitteeonwhichthememberserves.CommitteeScope:ThisCommitteeshallhaveprimaryresponsibilityfordocumentsonthestorage,transfer,anduseofindustrialgases.Includedarethestorageandhandlingofsuchgasesintheirgaseousorliquidphases;theinstallationofassociatedstorage,piping,anddistributionequipment;andoperatingpractices.TheCommitteealsohasatechnicalresponsibilityforcontributionsinthesameareasformedicalgasesandcleanrooms.NFPA50AStandardforGaseousHydrogenSystemsatConsumerSites1999EditionNOTICE:Anasterisk(*)followingthenumberorletterdesignatingaparagraphindicatesthatexplanatorymaterialontheparagraphcanbefoundinAppendixA.InformationonreferencedpublicationscanbefoundinChapter7andAppendixC.InformationonthephysicalpropertiesofgaseoushydrogencanbefoundinAppendixB.NEXTCHAPTERChapter1GeneralInformation1Scope.Thisstandardcoverstherequirementsfortheinstallationofgaseoushydrogensystemsonconsumerpremiseswherethehydrogensupplytotheconsumerpremisesoriginatesoutsidetheconsumerpremisesandisdeliveredbymobileequipment.2Classification.Systemsareclassifiedaccordingtothetotalvolumeofhydrogen,includingunconnectedreserves,asfollows:Lessthan3500scf(99m3),exceptascoveredin1-3.1From3500(99m3)to15,000scf(425m3)Inexcessof15,000scf(425m3)3Application.3.1Theapplicationofthisstandardatplacesofpublicassemblyshallbesubjecttoapprovaloftheauthorityhavingjurisdiction.3.2Thisstandardshallnotapplytosinglesystemsusingcontainershavingatotalhydrogencontentoflessthan400scf(11m3).Whereindividualsystems,eachhavingatotalhydrogencontentoflessthan400scf(11m3),arelocatedlessthan5ft(1.5m)fromeachother,thisstandardshallapply.3.3Thisstandardshallnotapplytohydrogenmanufacturingplantsorotherestablishmentsoperatedbythehydrogensupplierorhisorheragentforthepurposeofstoringhydrogenandrefillingportablecontainers,trailers,mobilesupplytrucks,ortankcars.4Retroactivity.Anexistingsystemthatisnotinstrictcompliancewiththeprovisionsofthisstandardshallbepermittedtobecontinuedinusewheresuchusedoesnotconstituteadistincthazardtolifeoradjoiningproperty.5Definitions.Approved.*Acceptabletotheauthorityhavingjurisdiction.AuthorityHavingJurisdiction.*Theorganization,office,orindividualresponsibleforapprovingequipment,aninstallation,oraprocedure.CombustibleLiquid.Aliquidhavingaclosed-cupflashpointatorabove100°F(37.8°C)andaresubdividedasfollows:ClassIIliquidsincludethosehavingaflashpointatorabove100°F(37.8°C)andbelow140°F(60°C).ClassIIIAliquidsincludethosehavingaflashpointatorabove140°F(60°C)andbelow200°F(93.4°C).ClassIIIBliquidsincludethosehavingaflashpointatorabove200°F(93.4°C).FlammableLiquid(ClassI).*Anyliquidhavingaclosed-cupflashpointbelow100°F(37.8°C)andhavingavaporpressurenotexceeding40psia(276kPa)at100°F(37.8°C).Gallon.AstandardU.S.gallon.GaseousHydrogenSystem.*Asysteminwhichthehydrogenisdelivered,stored,anddischargedinthegaseousformtoconsumer'spiping.Thesystemterminatesatthepointwherehydrogenatservicepressurefirstenterstheconsumer'sdistributionpiping.Labeled.Equipmentormaterialstowhichhasbeenattachedalabel,symbol,orotheridentifyingmarkofanorganizationthatisacceptabletotheauthorityhavingjurisdictionandconcernedwithproductevaluation,thatmaintainsperiodicinspectionofproductionoflabeledequipmentormaterials,andbywhoselabelingthemanufacturerindicatescompliancewithappropriatestandardsorperformanceinaspecifiedmanner.Limited-CombustibleMaterial.Amaterial,asdefinedinNFPA220,StandardonTypesofBuildingConstructionpotcomplyingwiththedefinitionofnoncombustiblematerialthat,intheforminwhichitisused,hasapotentialheatvaluenotexceeding3500Btu/lb(8141kJ/kg)andcomplieswithoneofthefollowingparagraphs(a)or(b).Materialssubjecttoanincreaseincombustibilityorflamespreadrating,beyondthelimitshereinestablished,throughtheeffectsofage,moisture,orotheratmosphericconditionareconsideredcombustible.Materialshavingastructuralbaseofnoncombustiblematerial,withasurfacingnotexceedingathicknessofi/8in.(3.2mm)thathasaflamespreadratingnotgreaterthan50.*Materials,intheformandthicknessused,otherthanasdescribedin,havingneitheraflamespreadratinggreaterthan25norevidenceofcontinuedprogressivecombustionandofsuchcompositionthatsurfacesthatwouldbeexposedbycuttingthroughthematerialonanyplanewouldhaveneitheraflamespreadratinggreaterthan25norevidenceofcontinuedprogressivecombustion.Listed.*Equipment,materials,orservicesincludedinalistpublishedbyanorganizationthatisacceptabletotheauthorityhavingjurisdictionandconcernedwithevaluationofproductsorservices,thatmaintainsperiodicinspectionofproductionoflistedequipmentormaterialsorperiodicevaluationofservices,andwhoselistingstatesthateithertheequipment,material,orservicemeetsidentifiedstandardsorhasbeentestedandfoundsuitableforaspecifiedpurpose.NoncombustibleMaterial.Amaterial,asdefinedinNFPA220,StandardonTypesofBuildingConstructionthat,intheforminwhichitisusedandundertheconditionsanticipated,willnotignite,burn,supportcombustion,orreleaseflammablevaporswhensubjectedtofireorheat.Materialsreportedasnoncombustible,whentestedinaccordancewithASTME136,StandardMethodofTestforBehaviorofMaterialsinaVerticalTubeFurnaceat750°C,areconsiderednoncombustiblematerials.Outdoors.Locationoutsideofanybuildingorstructureorlocationsunderaroof,weathershelter,orcanopyprovidedthisareaisnotenclosedonmorethantwosides.SeparateBuilding.Adetached,noncommunicatingbuildingusedexclusivelytohouseahydrogensystem.Shall.Indicatesamandatoryrequirement.SpecialRoom.Aseparateenclosedareathatispartoforattachedtoanotherbuildingandisusedexclusivelyforahydrogensystem.Standard.Adocument,themaintextofwhichcontainsonlymandatoryprovisionsusingtheword“shall”toindicaterequirementsandwhichisinaformgenerallysuitableformandatoryreferencebyanotherstandardorcodeorforadoptionintolaw.Nonmandatoryprovisionsshallbelocatedinanappendix,footnote,orfine-printnoteandarenottobeconsideredapartoftherequirementsofastandard.StandardCubicFoot(scf).Onecubicfootofgasat70°F(21°C)and14.7psia(anabsolutepressureof101kPa).NEXTCHAPTER1Containers.1.1Hydrogencontainersshallcomplywithoneofthefollowing:Designed,constructed,andtestedinaccordancewithappropriaterequirementsofASMEBoilerandPressureVesselCodeSectionVIII,“RulesfortheConstructionofPressureVessels"Designed,constructed,tested,andmaintainedinaccordancewith49CFR171-1901.2Permanentlyinstalledcontainersshallbeprovidedwithsubstantialsupportsofnoncombustiblematerialonfirmfoundationsofnoncombustiblematerial.1.3EachportablecontainershallbelegiblymarkedwiththenameHYDROGENinaccordancewithANSI/CGAC-4,MethodofMarkingPortableCompressedGasContainerstoIdentifytheMaterialContaineEachmanifoldhydrogensupplyunitshallbelegiblymarkedwiththenameHYDROGENoralegendsuchas“Thisunitcontainshydrogen."2PressureReliefDevices.2.1HydrogencontainersshallbeequippedwithpressurereliefdevicesasrequiredbytheASMECodeortheDOTSpecificationsandRegulationsinderwhichthecontainerisfabricated.2.2Pressurereliefdevicesshallbearrangedtodischargeupwardandunobstructedtotheopenairinsuchamannerastopreventanyimpingementofescapinggasuponthecontainer,adjacentstructures,orpersonnel.ThisrequirementshallnotapplytoDOTspecificationcontainershavinganinternalvolumeof2.0ft3(0.057m3)orless.2.3Pressurereliefdevicesorventpipingshallbedesignedorlocatedsothatmoisturecannotcollectandfreezeinamannerthatwouldinterferewithproperoperationofthedevice.3Piping,Tubing,andFittings.3.1Piping,tubing,andfittingsshallbesuitableforhydrogenserviceandforthepressuresandtemperaturesinvolved.Cast-ironpipeandfittingsshallnotbeused.3.2MaterialspecificationsandthicknessrequirementsforpipingandtubingshallconformtoASMEB31.3,CodeforChemicalPlantandPetroleumRefineryPiping.2-3.3Jointsinpipingandtubingshallbemadebyweldingorbrazingorbyuseofflanged,threaded,socket,slip,orcompressionfittings.Gasketsandthreadsealantsshallbesuitableforhydrogenservice.Brazingmaterialsshallhaveameltingpointabove1000°F(538°C).2-4EquipmentAssembly.2-4.1Valves,gauges,regulators,andotheraccessoriesshallberecommendedforhydrogenservicebythemanufacturerorthehydrogensupplier.2-4.2Installationofhydrogensystemsshallbesupervisedbypersonnelfamiliarwithproperpracticeswithreferencetotheirconstructionanduse.2-4.3Storagecontainers,piping,valves,regulatingequipment,andotheraccessoriesshallbeaccessibleandshallbeprotectedagainstphysicaldamageandagainsttamperingbythegeneralpublic.2-4.4Cabinetsorhousingscontaininghydrogencontroloroperatingequipmentshallbeventilatedtominimizeaccumulationofhydrogen.2-4.5Eachmobilehydrogensupplyunitusedaspartofahydrogensystemshallbesecuredtopreventmovement.2-4.6Mobilehydrogensupplyunitsshallbeelectricallybondedtothesystembeforedischarginghydrogen.2-5Marking.Thehydrogenstoragelocationshallbepermanentlyplacardedeitherasfollowsorwithequivalentwording:HYDROGEN—FLAMMABLEGAS—NOSMOKING—NOOPENFLAMES2-6Testing.Afterinstallation,allpiping,tubing,andfittingsshallbetestedandprovedhydrogengas-tightatmaximumoperatingpressure.NEXTCHAPTERChapter3LocationofGaseousHydrogenSystems1GeneralRequirements.1.1Thesystemshallbelocatedsothatitisaccessibletodeliveryequipmentandtoauthorizedpersonnel.Roadwaysorothermeansofaccessforemergencyequipment,suchasfiredepartmentapparatus,shallbeprovided.1.2Systemsshallbelocatedabovegroundeitheratgradeorabovegrade.1.3Systemsshallnotbelocatedbeneathorwhereexposedtofailureofthefollowing:ElectricpowerlinesPipingcontainingallclassesofflammableorcombustibleliquids(seedefinitioninSection1-5)Pipingcontainingotherflammablegases,orpipingcontainingoxidizingmaterials1.4Systemswithin50ft(15m)ofabovegroundstorageofallclassesofflammableandcombustibleliquidsshallbelocatedongroundhigherthansuchstorage,exceptwheredikes,diversioncurbs,grading,orseparatingsolidwallsareusedtopreventaccumulationoftheseliquidsunderthesystem.2SpecificRequirements.2.1Thelocationofasystem,asdeterminedbythemaximumtotalcontainedvolumeofhydrogen,shallbeintheorderofpreferenceasindicatedbyRomannumeralsinTable3-2.1.

Table3-2.1PreferredLocationsofGaseousHydrogenSystemsNatureofLocationSizeofHydrogenSystemLessthan3500scf(99m3)3500scfto15,000scf(99m3to425m3)InExcessof15,000scf(425m3)OutdoorsIIIInaseparatebuildingIIIIIIInaspecialroomIIIIIINotpermittedInsidebuildingsnotinaspecialroomorexposedtootheroccupanciesIVNotpermittedNotpermitted2.2Theminimumdistanceinfeetfromahydrogensystemofindicatedcapacitylocatedeitheroutdoors,inseparatebuildings,orinspecialroomstoanyspecifiedoutdoorexposureshallbeinaccordancewithTable3-2.2.Thedistancesinnumbers1,3through10,and14inclusiveinTable3-2.2shallnotapplywhereprotectivestructureshavingaminimumfireresistanceratingof2hoursarelocatedbetweenthesystemandtheexposure.Table3-2.2MinimumDistancefromOutdoorGaseousHydrogenSystemstoExposuresTypeofOutdoorExposureTotalGaseousHydrogenStorageLessthan3500scf(99m3)3500scfto15,000scf(99m3to425m3)InExcessof15,000scf(425m3)ftmftmftm1.Buildingorstructure

(a)Wall(s)adjacenttosystemconstructedofnoncombustibleorlimited-combustiblematerials(1)Sprinkleredbuildingorstructureorunsprinkleredbuildingorstructurehavingnoncombustiblecontents0a05a1.55a1.5(2)UnsprinkleredbuildingorstructurewithcombustiblecontentsAdjacentwall(s)withfireresistanceratinglessthan2hoursb0c0103.125d7.6Adjacentwall(s)withfireresistanceratingof2hoursorgreaterb0051.551.5(b)Wall(s)adjacenttosystemconstructedofotherthannoncombustibleorlimited-combustiblematerials103.1257.650d15.22.Wallopenings(a)Notaboveanypartofasystem103.1103.1103.1(b)Aboveanypartofasystem257.6257.6257.63.Allclassesofflammableandcombustibleliquidsaboveground(a)0-1000gal(3785L)103.1257.6257.6(b)Inexcessof1000gal(3785L)257.65015.25015.24.Allclassesofflammableandcombustibleliquidsbelowground—0-1000gal(3785L)e(a)Tank103.1103.1103.1(b)Ventorfillopeningoftank257.6257.6257.65.Allclassesofflammableandcombustibleliquidsbelowground—inexcessof1000gal(3785L)e(a)Tank206.1206.1206.1(b)Ventorfillopeningoftank257.6257.6257.66.Flammablegasstorage(otherthanhydrogen),eitherhighpressureorlowpressure(a)0-15,000scf(255m3)capacity103.1257.6257.6

(b)Inexcessof15,000scf(255m3)capacity257.65015.25015.27.Oxygenstorage(a)20,000scf(566m3)orlessRefertoNFPA51,StandardfortheDesignandInstallationofOxygen-FuelGasSystemsforWelding,Cutting,andAlliedProcesses(b)Morethan20,000scf(566m3)RefertoNFPA50,StandardforBulkOxygenSystemsatConsumerSites8.Fast-burningsolidssuchasordinarylumber,excelsior,orpaper5015.25015.25015.29.Slow-burningsolidssuchasheavytimberorcoal257.6257.6257.610.Openflamesandwelding257.6257.6257.611.Aircompressorintakesorinletstoventilatingorairconditioningequipment5015.25015.25015.212.Placesofpublicassembly257.65015.25015.213.Publicsidewalksandparkedvehicles154.6154.6154.614.Lineofadjoiningpropertythatcanbebuiltupon51.551.551.5aPortionsofwalllessthan10ft(3m)(measuredhorizontally)fromanypartofasystemshallhaveafireresistanceratingofatleast%hour.bExclusiveofwindowsanddoors(seenumber2ofTable3-2.2cPortionsofwallslessthan10ft(3m)(measuredhorizontally)fromanypartofasystemshallhaveafireresistanceratingofatleast1hour.dButnotlessthanone-halftheheightofadjacentwallofbuildingorstructure.eDistancescanbereducedto15ft(4.5m)forClassIIIBcombustibleliquids.2.3UnloadingconnectionsondeliveryequipmentshallnotbepositionedclosertoanyoftheexposurescitedinTable3-2.2thanthedistancesgivenforthestoragesystem.2.4Hydrogensystemsoflessthan3500scf(99m3),wherelocatedinsidebuildingsandexposedtootheroccupancies,shallbesituatedinthebuildingsothatthesystemwillbeasfollows:Inanadequatelyventilatedareaasin4-2.220ft(6m)fromallclassesofflammableandcombustibleliquids,oxidizinggases,andreadilycombustiblematerials,suchasexcelsiorandpaper25ft(7.6m)fromopenflames,ordinaryelectricalequipment,orothersourcesofignition50ft(15m)fromintakesofventilationorair-conditioningequipmentandaircompressors50ft(15m)fromotherflammablegasstorageProtectedagainstdamageorinjuryduetofallingobjectsorworkingactivityinthearea2.5Morethanonesystemof3500scf(99m3)orlessshallbepermittedtobeinstalledinthesameroom,providedthesystemsareseparatedbyatleast50ft(15m)orwhereamasonrystructurehavingaminimumfireresistanceratingof2hoursislocatedbetweenthesystems.Eachsuchsystemshallmeetalloftherequirementsofthissection.Exception:Theseparationdistancebetweenmultiplesystemsof3500scf(99m3)orlessshallbepermittedtobereducedto25ft(7.6m)inbuildingswheretheoccupancybetweenstorageareasisfreeofcombustiblematerialsandprotectedwithasprinklersystemdesignedforOrdinaryHazard,Group1occupanciesorLightHazardoccupanciesinaccordancewNFPA1,StandardfortheInstallationofSprinklerSystems.NEXTCHAPTERChapter4DesignConsiderationsatSpecificLocations1OutdoorLocations.1.1Whereprotectivewallsorroofsareprovided,theyshallbeconstructedofnoncombustibleorlimited-combustiblematerials.1.2Electricalequipmentwithin15ft(4.6m)shallbeinaccordancewithArticle501ofNFPA70,NationalElectricalCode,forClassI,Division2locations.2SeparateBuildings.2.1Separatebuildingsshallbeconstructedofnoncombustibleorlimitedcombustiblematerials.Windowsanddoorsshallbelocatedsoastobereadilyaccessibleincaseofemergency.Exception:Windowglazingshallbepermittedtobeplastic.2.2Ventilationtotheoutdoorsshallbeprovided.Inletopeningsshallbelocatednearthefloorinexteriorwallsonly.Outletopeningsshallbelocatedatthehighpointoftheroominexteriorwallsorroof.Inletandoutletopeningsshalleachhaveaminimumtotalareaof1ft2/1000ft3(1m2/305m3)ofroomvolume.Dischargefromoutletopeningsshallbedirectedorconductedtotheatmosphere.2.3*Exteriorwallsofseparatebuildingsshallbeconstructedoflightweightmaterialsorpanelsdesignedtorelieveatamaximuminternalpressureof25lb/ft2(13.3kPa/m2).2.4Thereshallbenosourcesofignitionfromopenflames,electricalequipment,orheatingequipment.2.5ElectricalequipmentshallbeinaccordancewithArticle501ofNFPA70,NationalElectricalCodeforClassI,Division2locations.2.6Heating,ifprovided,shallbebysteam,hotwater,orotherindirectmeansexceptthatelectricalheatingshallbepermittedtobeusedifincompliancewith2.5.4-3SpecialRooms.4-3.1Floor,walls,andceilingshallbeconstructedofnoncombustibleorlimitedcombustiblematerials.Interiorwallsorpartitionsshallhaveafireresistanceratingofatleast2hours,shallbecontinuousfromfloortoceiling,andshallbesecurelyanchored.Atleastonewallshallbeanexteriorwall.Openingstootherpartsofthebuildingshallnotbepermitted.Windowsanddoorsshallbeinexteriorwallsandshallbelocatedsoastobereadilyaccessibleincaseofemergency.Exception:Windowglazingshallbepermittedtobeplastic.4-3.2Ventilationshallbeasprovidedin4-2.2.4-3.3Explosionventingshallbeasprovidedin4-2.3.4-3.4Thereshallbenosourcesofignitionfromopenflames,electricalequipment,orheatingequipment.4-3.5ElectricalequipmentshallbeinaccordancewithArticle501ofNFPA70,NationalElectricalCode,forClassI,Division2locations.4-3.6Heating,ifprovided,shallbebysteam,hotwater,orindirectmeansexceptthatelectricalheatingshallbepermittedtobeusedifincompliancewith4-3.5.NEXTCHAPTER1OperatingInstructions.Forinstallationsthatrequireanyoperationofequipmentbytheuser,instructionsshallbemaintainedatoperatinglocations.2Maintenance.Eachhydrogensysteminstalledonconsumerpremisesshallbeinspectedannuallyandmaintainedbyaqualifiedrepresentativeoftheequipmentowner.3ClearancetoCombustibles.Theareawithin15ft(4.6m)ofanyhydrogencontainershallbekeptfreeofdryvegetationandcombustiblematerial.NEXTCHAPTER1*Caution.Personnelshallbecautionedthathydrogenflamesarepracticallyinvisible.NEXTCHAPTER1Thefollowingdocumentsorportionsthereofarereferencedwithinthisstandardasmandatoryrequirementsandshallbeconsideredpartoftherequirementsofthisstandard.TheeditionindicatedforeachreferencedmandatorydocumentisthecurrenteditionasofthedateoftheNFPAissuanceofthisstandard.Someofthesemandatorydocumentsmightalsobereferencedinthisstandardforspecificinformationalpurposesand,therefore,arealsolistedinAppendixC.7-1.1NFPAPublications.NationalFireProtectionAssociation,1BatterymarchPark,P.O.Box9101,Quincy,MA02269-9101.NFPA13,StandardfortheInstallationofSprinklerSystems996edition.NFPA50,StandardforBulkOxygenSystemsatConsumerSitet996edition.NFPA51,StandardfortheDesignandInstallationofOxygen-FuelGasSystemsforWelding,Cutting,andAlliedProcesses997edition.NFPA70,NationalElectricalCod?,1999edition.NFPA220,StandardonTypesofBuildingConstruction995edition.7-1.2OtherPublications.7-1.2.1ASMEPublications.AmericanSocietyofMechanicalEngineers,345East47thStreet,NewYork,NY10017.ASME/ANSIB31.3,ProcessPiping,1996.ASMEBoilerandPressureVesselCodeSectionVIII,“RulesfortheConstructionofPressureVessels,"1995.7-1.2.2ASTMPublication.AmericanSocietyforTestingandMaterials,100BarrHarborDrive,WestConshohocken,PA19428-2959.ASTME136-96a,StandardMethodofTestforBehaviorofMaterialsinaVerticalTubeFurnaceat75,0°998.7-1.2.3CGAPublication.CompressedGasAssociation,1725JeffersonDavisHighway,Arlington,VA22202-4100.ANSI/CGAC-4,MethodofMarkingPortableCompressedGasContainerstoIdentifytheMaterialContained1990.7-1.24U.S.GovernmentPublication.U.S.GovernmentPrintingOffice,Washington,DC20402.Title49,CodeofFederalRegulationsParts171-190,U.S.DepartmentofTransportationSpecificationsandRegulations.NEXTCHAPTERAppendixAExplanatoryMaterialAppendixAisnotapartoftherequirementsofthisNFPAdocumentbutisincludedforinformationalpurposesonly.Thisappendixcontainsexplanatorymaterial,numberedtocorrespondwiththeapplicabletextparagraphs.A-1-5Approved.TheNationalFireProtectionAssociationdoesnotapprove,inspect,orcertifyanyinstallations,procedures,equipment,ormaterials;nordoesitapproveorevaluatetestinglaboratories.Indeterminingtheacceptabilityofinstallations,procedures,equipment,ormaterials,theauthorityhavingjurisdictionmaybaseacceptanceoncompliancewithNFPAorotherappropriatestandards.Intheabsenceofsuchstandards,saidauthoritymayrequireevidenceofproperinstallation,procedure,oruse.Theauthorityhavingjurisdictionmayalsorefertothelistingsorlabelingpracticesofanorganizationthatisconcernedwithproductevaluationsandisthusinapositiontodeterminecompliancewithappropriatestandardsforthecurrentproductionoflisteditems.A-1-5AuthorityHavingJurisdiction.Thephrase“authorityhavingjurisdiction”isusedinNFPAdocumentsinabroadmanner,sincejurisdictionsandapprovalagenciesvary,asdotheirresponsibilities.Wherepublicsafetyisprimary,theauthorityhavingjurisdictionmaybeafederal,state,local,orotherregionaldepartmentorindividualsuchasafirechief;firemarshal;chiefofafirepreventionbureau,labordepartment,orhealthdepartment;buildingofficial;electricalinspector;orothershavingstatutoryauthority.Forinsurancepurposes,aninsura