GB50151-1992英文版低倍数泡沫灭火系统设计规范英文版.pdf 17页

'UDCGBNationalStandardofthePeople’sRepublicofChinaPGB50151-92低倍数泡沫灭火系统设计规范CodeofDesignforLowExpansionFoamExtinguishingSystemIssuedon:Jan.10,1992Implementedasof:July01,1992StateBureauofTechnologicalSupervisionJointlyIssuedby:MinistryofConstructionofPRCwww.bzfxw.com NationalStandardofthePeople’sRepublicofChinaCodeofDesignforLowExpansionFoamExtinguishingSystemGB50151-92CompiledandPreparedby:MinistryofPublicSecurityofPRCApprovedby:MinistryofConstructionofPRCImplementedasof:July01,1992www.bzfxw.com Noticeontheissuanceofthenationalstandard“CodeofDesignforLowExpansionFoamExtinguishingSystem”JB[1992]No.30IncompliancewiththerequestsofDocumentNo.2630Jizong[1986]ofStatePlanningCommission,the“CodeofDesignforLowExpansionFoamExtinguishingSystem”jointlycompiledandpreparedbytheMinistryofPublicSecurityandotherdepartmentsconcernedhasbeencheckedupjointlybythedepartmentsconcerned.ItisapprovedthatGB50151-92“CodeofDesignforLowExpansionFoamExtinguishingSystem”beanationalstandardandtakeeffectasofJuly1,1992.TheCodeiscontrolledbytheMinistryofPublicSecurity,interpretedbyTianjinFireFightingScientificResearchInstituteoftheMinistryofPublicSecurityandpublishedanddistributedbytheStandardQuotaResearchInstituteoftheMinistryofConstruction.MinistryofConstructionofPRCJan.10,1992www.bzfxw.com ExplanatoryNotestoCompilationandPreparationTheCodeispreparedjointlybyTianjinFireFightingScientificResearchInstituteoftheMinistryofPublicSecurityandthefollowingunits–SINOPECBeijingDesignInstitute,LuoyangPetrochemicalEngineeringCorporation,DaqingPetroleumExplorationDesignandResearchInstituteofChinaPetroleumNaturalGasCorporationandFireBrigadeofTianjinPublicSecurityBureauincompliancewithDocumentNo.2630Jizhong[1986]oftheStatePlanningcommission.Duringcompilationandpreparation,thedraftsmenoftheCodemadeextensiveinvestigationsandstudiesonthecurrentstatusofthescientificresearch,designandapplicationoflowexpansionfoamextinguishingsysteminourcountryinaccordancewithrelevantnationalpoliciesandthepolicyof“PuttingPreventionFirstandCombiningPreventionwithFighting”regardingfirefightingwork,testedandverifiedthesupplystrengthoffoamsolutiontakingintoconsiderationallpreviousmajortestscarriedoutinChinaandSino-JapanPetroleumFireFightingTest,especiallytheavailabilityofring-pumptypeproportioningprocessunderself-dumpingcondition.TheCodeischeckedupandfinalizedbythedepartmentsconcernedassimilatingthecurrentresultsofscientificresearchandengineeringpractices,referringtothecodeandinformationonthedesign,installationandacceptanceoflowexpansionfoamextinguishingsystemfromtheUS,Japan,Germany,RussianandISOandsolicitingtheopinionsfromscientificandresearchinstitutes,designinstitutesandhigher–educationcollegesanduniversitiessubordinatedtosomeprovincesandcities,departmentsandcommissionsconcernedaswellaslarge-sizedpetrochemicalenterprisesandpublicsecuritysupervisionauthoritiesforfirefighting.TheCodeisdividedintofourchaptersandtwoappendices,whichmainlyconsistofGeneralPrinciple,SelectionofFoamLiquidandSizingoftheSystem,SystemDesign,SystemAssembly,etc.SincetheCodeiscompiledandpreparedforthefirsttime,allunitsarerequestedtopayattentiontothecollectionofinformationandsumming-upofexperienceduringtheexecution.Ifsomethingisfoundtobemodifiedandsupplemented,pleasemailyourcommentsandrelevantmaterialstoTianjinFireFightingScientificandResearchInstituteoftheMinistryofPublicSecurity(Address:Liqizhuang,Tianjin,ZipCode:300381)forfuturereferenceandmodification.MinistryofPublicSecurityofPRCOctober,1991www.bzfxw.com CONTANTChapterIGeneralProvisions.........................................................................................................6ChapterIISelectionofFoamLiquidandSizingoftheSystem.....................................................6SectionISelection,StorageandFormulationofFoamSolution...........................................6SectionIISizingoftheSystem............................................................................................6ChapterIIISystemDesign.............................................................................................................7SectionIGeneralProvisionsofDesignforFoamExtinguishingSystemforTankFarm......7SectionIIDesignforInjectionFoamExtinguishingSystemforTankFarm.........................7SectionIIIDesignforSubmergedInjectionFoamExtinguishingSystemforTankFarm...10SectionIVFoamSprayingSystem......................................................................................12SectionVFoamPumpStation.............................................................................................12ChapterIVSystemAssembly......................................................................................................13SectionIGeneralProvisions................................................................................................13SectionIIFoamPumpandFoamProportioner....................................................................13SectionIIIFoamLiquidStorageVessel...............................................................................14SectionIVFoamGenerator..................................................................................................14SectionVValveandFitting..................................................................................................14AppendixITerminology..............................................................................................................15AppendixIINotesofWording..................................................................................................16AdditionalExplanatoryNotes:........................................................................................................17www.bzfxw.com ChapterIGeneralProvisionsArticle1.0.1TheCodeispreparedtodesignproperlythelowexpansionairfoamextinguishingsystem(hereinafterreferredasfoamextinguishingsystem),minimizefirelossesandguaranteethesafetyofpersonnelandproperty.Article1.0.2Thedesignforfoamextinguishingsystemshallcomplywiththerelevantnationalprinciplesandpolicies,besafeandreliable,advancedintechnology,rationalineconomyandeasyinmanagement.Article1.0.3TheCodeisapplicabletothedesignforfoamextinguishingsystemfortheprocess,storage,handlingandapplicationofClassA(exceptliquefiedhydrocarbons),BandCliquids.TheCodeisnotapplicabletothedesignforfoamextinguishingsystemforshipsandoffshoreoilplatforms.Article.1.0.4InadditiontothespecificationsoftheCode,thedesignforfoamextinguishingsystemshallconformtotherelevantstandardsandcodesinforceinthecountry.ChapterIISelectionofFoamLiquidandSizingoftheSystemSectionISelection,StorageandFormulationofFoamSolutionArticle2.1.1Fornon-aqueousliquidsofClassA,BandC,itisrecommendedthatproteinfoamliquid,fluoro-proteinfoamliquidoraqueousfilm-formingfoamliquidshallbeselectedifinjectionfoamextinguishingsystemisusedwhilefluoro-proteinfoamliquidoraqueousfilm-formingliquidshallbeselectedifsubmergedinjectionfoamextinguishingsystemisused.Article2.1.2Alcohol-resistantfoamliquidshallbeusedforaqueousliquidsofClassA,BandC.0Article2.1.3Foamliquidsshallbestoredatatemperatureof0-40Candinawell-ventilateddryroomorshed.Article2.1.4Theformulationoffoamliquidintofoamsolutionshallmeetthefollowingrequirements:1.Freshwaterorseawatermaybeusedtoformulateprotein,fluoro-proteinandalcohol-resistantfluoro-proteinfoamliquidintofoamsolution;2.Freshwatershallbeusedtoformulategel-typeandmetallicsoaptypefoamliquidintofoamsolution.3.Waterthathasanimpactontheextinguishingperformanceofthefoamisforbiddentobeusedtoformulateallkindsoffoamliquidintofoamsolution.4.Itisrecommendedthatthetemperatureofthewaterusedtoformulatefoamliquidintofoamsolutionbe04-35C.SectionIISizingoftheSystemArticle2.2.1Thesystemshallbesizedaccordingtothecompoundfactorssuchasthescaleoftheprotectedobject,firehazard,generalarrangement,difficultyoffiresuppressionandsetupoffirestation.Article2.2.2Itisrecommendedthatfixedfoamextinguishingsystembeselectedforoneofthefollowingapplications1.Independenttankfarmofnon-aqueousliquidsofClassA,BandCwithatotalstoragecapacity≥5003m;32.VerticaltankfarmofaqueousliquidsofClassA,BandCwithatotalstoragecapacity≥200m;www.bzfxw.com 3.Tankfarmofnon-aqueousliquidsofClassA,BandC,whichisaffiliatedtoenterpriseswithinadequatemechanicalfirefightingfacilities.Article2.2.3Itisrecommendedthatsemi-fixedfoamextinguishingsystembeusedforoneofthefollowingapplications:1.TankfarmofliquidsofClassA,BandCaffiliatedtoenterpriseswithstrongmechanicalfirefightingfacilities;2.Applicationswithpotentialoffirehazardinpetrochemicalproductionarea.Article2.2.4Itisrecommendedthatportablefoamextinguishingsystembeusedforoneofthefollowingapplications:31.Groundverticaltankofnon-aqueousliquidsofClassA,BandCwithatotalstoragecapacity≤500m,3singletankcapacity≤200mandtheheightoftankwall≤7m;32.GroundverticaltankofaqueousliquidsofClassA,BandCwithatotalstoragecapacity<200m,single3tankcapacity≤100mandtheheightoftankwall≤5m;3.Horizontaltanks;4.TheareaseasytoleakintheloadingplaceofClassA,BandCliquids.ChapterIIISystemDesignSectionIGeneralprovisionsofDesignforFoamExtinguishingsystemforTankFarmArticle3.1.1Thedesignforfoamextinguishingsystemfortankfarmandthefoamsolutionquantityshallmeettherequirementsofthesumofsolutionconsumptionnecessaryforsuppressingthefireofsingletankwithmaximumsolutionconsumptionandsolutionconsumptionnecessaryfortheauxiliaryfoamnozzlesusedtosuppressthespreadingfireofthetank.Article3.1.2Theamountnecessarytofillupthepipesshallbeincludedinthetotalstoragequantityoffoamliquidfortankfarminadditiontothequantitycalculatedwiththespecifiedsupplystrength,numberofnozzlesandcontinuoussupplyduration.Article3.1.3Iffixedfoamextinguishingsystemisused,portablefoamextinguishingdevicessuchasfoamhookpipe,foamnozzleandfoamfirevehicleshallbeprovidedinadditiontofixedfoamextinguishingdevices.Article3.1.4ThenumberoffoamnozzlesnecessaryforsuppressingthespreadingfireofliquidsofClassA,BandCshallbedeterminedwiththediameterofthetankwithmaximumconsumptionoffoamsolution,thenumberandcontinuoussupplydurationshallnotbelessthanthespecificationsinTable3.1.4.NumberoffoamnozzlesandcontinuoussupplydurationTable3.1.4DiameterofTank(m)NumberofPQ8NozzlesContinuousSupplyDurationProvided(piece)(min)<2311023-33220>33330SectionIIDesignforInjectionFoamExtinguishingSystemforTankFarmArticle3.2.1Thefiringareaofinjectionfoamextinguishingsystemforfixedrooftankshallbecalculatedwiththecrosssectionareaoftank.Thesupplystrengthandcontinuoussupplydurationoffoamsolutionshallconformtothefollowingspecifications:I.Fornon-aqueousliquidsofClassA,BandC,thestrengthanddurationshallnotbelessthanwww.bzfxw.com thoseinTable3.2.1-1.SupplyStrengthandContinuousSupplyDurationTable3.2.1-12ClassofliquidSupplyStrength(L/min.m)ContinuoussupplyFixedandPortabletypeduration(min)semi-fixedtypeClassA&B6.08.040ClassC6.08.030II.ForaqueousliquidsofClassA,BandC,thestrengthanddurationshallnotbelessthanthoseinTable3.2.1-2.SupplyStrengthandContinuousSupplyDurationTable3.2.1-22ClassofliquidSupplyStrength(L/min.m)ContinuoussupplyFixedandsemi-fixedtypeduration(min)Acetone,butanol1230Methanol,alcohol,butanon1225e,acrylon,ethylacetateNote:Forthoseaqueousliquidsnotlistedinthetable,theirsupplystrengthandcontinuoussupplydurationoffoamsolutionshallbedeterminedbytests.Article3.2.2Thedesignforfoamextinguishingsystemforouterfloatingrooftankshallconformtothefollowingspecifications:I.Theflowoffoamsolutionshallbecalculatedbasedontheannularareabetweentankwallandfoamweirplate,theminimumsupplystrengthandthemaximumprotectionperimeteroffoamgeneratorandcontinuoussupplydurationshallallconformtothespecificationsofTable3.2.2;II.Thedistancefromfoamweirplatetothetankwallshallbe≥1.0m.Ifmechanicalsealisused,theheightoftheweirplateshallbe≥0.25m;Ifsoftsealisused,theheightoftheweirplateshallbe≥0.9m.Waterdischargeholesshallbeprovidedatthelowestpartoftheweirplate,theopeningareashallbecalculatedbasedontheassumptionthattwo12mmx8mmrectangularopeningsareprovidedforeverysquaremeterofannulararea.SupplyStrengthofFoamSolution,ProtectionPerimeterofFoamGeneratorandContinuousSupplyDurationTable3.2.2FoamSupplyStrengthProtectionContinuousGeneratorPerimeterDuration2TypeFlowofSolution(L/min.m)(m)(min)(L/min)PC424012.51830PC848012.53630Article3.2.3Thedesignforfoamextinguishingsystemforinnerfloatingrooftankshallconformtothefollowingspecifications:I.Forshallow-pantypeinnerfloatingrooftanksandtheinnerfloatingrooftankswiththefloatingpanmadeoffusiblematerial,thefiringarea,supplystrengthandcontinuoussupplydurationshallconformtothespecificationsinArticle3.2.1oftheCode.www.bzfxw.com III.Forsingle-anddouble-pantypeinnerfloatingrooftanks,thefiringarea,supplystrengthandcontinuoussupplydurationoffoamsolutionshallconformtothespecificationsofitem1ofArticle3.2.2oftheCode,thedistancefromfoamweirplatetotankwallshallbe≥0.55m,andtheheightoftheplateshallbe≥0.5m.Article3.2.4Thefoamgeneratorforinjectionfoamextinguishingsystemshallbeprovidedaccordingtothefollowingspecifications:I.Forfixedrooftank,innerfloatingrooftankofshallow-pantypeandwiththefloatingroofmadeoffusiblematerial,thetypeandnumberoffoamgeneratorshallbedeterminedbytheflowoffoamsolutioncalculated,andthenumberprovidedshallnotbelessthanthosespecifiedinTable3.2.4.NumberofFoamGeneratorProvidedTable3.2.4DiameterofTank(m)NumberofFoamGeneratorProvided(set)<10110-20221-25326-354II.Forouterfloatingrooftanksandinnerfloatingrooftanksofsingleanddouble–disctype,thetypeandnumberoffoamgeneratorshallbedeterminedaccordingtothespecificationinArticle3.2.2;III.Theinletpressureoffoamgeneratorshallbe0.3—0.6Mpa,thecorrespondingflowoffoamsolutionshallbecalculatedwiththefollowingequation:q=kp(3.2.4)1Whereq—Flowoffoamsolution(L/s);K1—Flowcharacteristiccoefficientoffoamgenerator;p--Inletpressureoffoamgenerator(Mpa).Article3.2.5Theroutingoffoamsolutionpipeonthetankshallconformtothefollowingspecifications:I.Forfixedrooftank,innerfloatingrooftankofshallow-pantypeorwiththefloatingpanmadeoffusiblematerial,eachfoamgeneratorshallberoutedoutofthefire-proofembankmentwithseparatesolutionpipe.II.Forouterfloatingrooftankandinnerfloatingrooftankofsingleanddouble–disctype,everytwogeneratorshallberoutedwithonecommonpipeatthebottomoftheverticalpipeoffoamsolutionoutofthefire-proofembankment.Whenthreeormoregeneratorsshareonepipeatthebottomendoftheverticalpipeoffoamsolutionbeingroutedoutofthefire-proofembankment,controlvalveshallbeprovidedineachverticalpipeoffoamsolution.Thesolutionflownecessaryforeachfoamsolutionpipeoffixedfoamextinguishingbeingroutedoutofthefire-proofembankmentshallnotbegreaterthanthesupplyamountofonefirevehicle.III.Theverticalpipeoffoamsolutionconnectingfoamgeneratorsshallbefixedwithclipsonthetankwall,withaclearance≦3m.Rustcleanershallbeprovidedatthebottomendoftheverticalpipeoffoamsolution.Theverticalpipeoffoamsolutionshallbeconnectedtothehorizontalpipewithmetalhose.Itisallowedthatouterfloatingrooftankbenotprovidedwithmetalhose;IV.Theladderandplatformforouterfloatingrooftankshallbeprovidedthepipeconnectionwithcover,www.bzfxw.com theconnectionisroutedalongthetankwallto0.7mabovethegroundoroutofthefire-proofembankment,andcorrespondingconnectionsshallbeprovided.Article3.2.6Theroutingoffoamsolutionpipewithinthefire–proofembankmentshallconformtothefollowingspecifications:I.Thehorizontalpipeoffoamsolutionshallberoutedonpipestandorsupport,howevernotfixedwiththem.II.Thepipeoffoamsolutionshallbeinclinedwith30%slopetothefire-proofembankment.Article3.2.7Theroutingoffoamsolutionpipeoutoffire-proofembankmentshallconformtothefollowingspecifications:I.Itisrecommendedthathydrantsbeprovidedinthefoamsolutionpipe,thenumbershallbedeterminedaccordingtothenumberofnozzlesandtheradiusofprotectionspecifiedinArticle3.1.4oftheCode;II.Thefoamsolutionpipeshallbeinclinedwith2%slopetoventvalve,thecontrolvalveinthepipeshallbelocatedoutofthefire-proofembankmentandbeprovidedwithclearmark;III.Highventsshallbeprovidedinfoamsolutionpipe.Article3.2.8Thedesignflowforfoamsolutionpipeshallbe≤3m/s,thehydrauliccalculationsshallbedonebasedonthenationalstandardinforce“DesignCodeofAutoSprayingfireextinguishingsystem“.SectionIIIDesignforSubmergedInjectionFoamExtinguishingSystemforTankFarmArticle3.3.1ThesubmergedinjectionfoamextinguishingsystemshallnotbeadoptedfortanksofaqueousliquidsofClassA,BandC,neithershoulditbeusedforouterfloatingandinnerfloatingrooftanks.Article3.3.2Forgroundfixedrooftanks,whensubmergedinjectionfoamextinguishingsystemandfluoro-proteinfoamliquidisused,thefollowingspecificationsshallbesatisfied:2I.Thesupplystrengthoffoamsolutionshall≥6L/min.m,foamexpansionof3shallbeused;02Ifthestoragetemperatureexceeds50Cortheviscosityisgreaterthan40mm/s,thesupplystrengthoffoamsolutionshallbedeterminedbytests;II.Thecontinuoussupplydurationoffoamsolutionshallbe30min;III.Thespeedoffoamenteringintooilshallbe≤3m/s;0IV.Theinjectionnozzleshallbeinclinedupwardwithaninclinedangleof45,thelengthofinjectionpipeintrudingintothetankshallbe≥10timesthediameterofinjectionpipe.Ifonlyoneinjectionnozzleisavailable,itshallbelocatedatthecenterofthetank;ifmorethanonenozzleisprovided,theyshallbelocatedevenlywithanapproximateequalflowforeachinjectionnozzle;V.Foaminjectionnozzleshallbeinstalledabovethewaterlayerofthetank.ThenumberofinjectionnozzleprovidedshallnotbelessthanthatspecifiedinTable3.3.2.www.bzfxw.com NumberofinjectionnozzleprovidedTable3.3.2DiameterofTank(m)NumberofInjectionNozzle(piece)<23123-332>333Article3.3.3Thehighback-pressurefoamgeneratorforsubmergedinjectionfoamextinguishingsystemshallbeprovidedasfollows:I.ThenumberofgeneratorsprovidedshallbedeterminedaccordingtothefoamsolutionflowcalculatedinArticle3.2.2;II.Theoutletpressureshallbegreaterthanthesumofpiperesistanceandhydraustaticpressureinsidethetank;III.Theinletpressureshallbe0.6-1.0Mpa,thecorrespondingflowoffoamsolutionshallbecalculatedwiththefollowingequation:q=kp(3.3.3)2Whereq—theflowoffoamsolution(L/min);K2—theflowcharacteristiccoefficientofhighback-pressurefoamgenerator;p—theinletpressureofhighback-pressurefoamgenerator(Mpa).Article3.3.4Thefoampipeofsubmergedinjectionfoamextinguishingsystemshallberoutedaccordingtothefollowingspecifications:I.Thefoampipeinsidethefire-proofembankmentshallberoutedaccordingtoArticle3.2.6oftheCode.II.Ventvalvesshallbeprovidedinthefoampipeoutofthefire-proofembankment,andwith2%slopetoventvalves;nohydrantsandgasvalvesshallbeprovided.Article3.3.5Thehydrauliccalculationsshallconformtothefollowingspecifications:I.Thehydrauliccalculationsshallbebasedonthefollowingequation:1.72H=CQ(3.3.5)Whereh—Resistancelossofunitlengthoffoampipe(Pa/10m);C—CoefficientofpiperesistancelossQ—Foamflow(L/S)II.ThecoefficientofpiperesistancelossshallbeselectedfromTable3.3.5-1.CoefficientofpiperesistancelossTable3.3.5-1PipeDiameter(mm)CoefficientofPipeResistanceLoss10012.9201502.1402000.5552500.2103000.111www.bzfxw.com 3500.070III.ThevalveinfoampipeandequivalentlengthofsomepipefittingsshallbedeterminedaccordingtoTable3.3.5-2.ValveinFoamPipeandEquivalentLengthofSomePipeFittingsTable3.3.5-2Nominaldiameter150200250300(mm)categoryofpipefittingGatevalve1.251.501.752.0900elbow4.255.006.758.00Swingcheckvalve12.0015.2520.5024.50Article3.3.6Forsubmergedinjectionfoamextinguishingsystem,theroutingoffoamsolutionpipeandhydrauliccalculationsshallbedeterminedaccordingtoArticle3.2.7&3.2.8oftheCode.Article3.3.7Forsubmergedinjectionfoamextinguishingsystem,steelcontrolvalveandcheckvalveshallbeprovidedinfoampipewithinthefire-proofembankment,andsteelcontrolvalvebeprovidedoutoftheembankment.SectionIVFoamSprayingSystemArticle3.4.1ThefoamsprayingsystemisapplicablefortheprotectionofClassA,BandCliquidswhichmightleakandwithinadequatemechanicalfirefightingfacilities.Article3.4.2Forfoamsprayingsystem,ifsuctiontypesprinklerisused,protein,fluoro-protein,aqueousfilm-formingfoamoralcohol-resistantfoamliquidshallbeusedwhileaqueousfilm-formingfoamliquidshallbeusedifnon-suctiontypesprinklerisadopted.Article3.4.3Ifproteinfoamliquidorfluoro-proteinfoamliquidisusedtoprotectnon-aqueousliquidsof2ClassA,BandC,thesupplystrengthshallnotbelessthan8L/min.m,andthecontinuoussupplydurationshallnotbeshorterthan10min.Ifaqueousfilm-formingfoamliquidisusedtoprotectnon-aqueousliquidsofClassA,BandCoralcohol-resistantfoamliquidisusedtoprotectaqueousliquidsofClassA,BandC,thesupplystrengthandcontinuoussupplydurationoffoamsolutionshallbedeterminedbytests.Article3.4.4Thehead-sprayingfoamsprinklershallbelocated3-10mabovethelowestpartoftheprotectedobject;ifitisbeyondthisrange,itshallbedeterminedbytests.Article3.4.5Automaticfirealarmsshallbeprovidedforfoamsprayingsystem.Theyshallbeinautocontrolmode,butalsoprovidedwithmanualcontroldevice.SectionVFoamPumpStationArticle3.5.1Itisrecommendedthatfoampumpstationbeconstructedcombiningwithfirefightingwaterpumphouse,withafire–resistantgradenotlowerthanII.Thedistancefrompumpstationtotheprotectedobjectshallnotbelessthan30m,anditshallnottakelongerthan5min.todeliveryfoamorfoamsolutiontothefarthestprotectedobjectafterthestart-upoffoampump.Article3.5.2Itisrecommendedthatfoampumpbestartedbyselfdumping,nolessthantwosuctionlinesshallbeprovidedforeachgroupoffoampumps,whenonelinefails,theotheronecanhandleallthewww.bzfxw.com waterconsumption.Article3.5.3Itisrecommendedthathydrantsbeprovidedinfoamsolutionpipeinandoutofthefoampumpstation;andfoamnozzlesbeprovidedinfoampumpstation.Article3.5.4Standbypumpshallbeprovidedforfoampump,itscapacityshallnotbelessthanthemaximumcapacityofonepump.Nostandbypumpshallbeprovidedifoneofthefollowingsismet:3I.Thetotalstoragecapacityofnon-aqueousliquidsofClassA,BandCislessthan2500mandthe3capacityofsingletankislessthan500m.3II.ThetotalstoragecapacityofaqueousliquidsofClassA,BandCislessthan1000mandthecapacity3ofsingletankislessthan100m.Article3.5.5Backuppowershallbeprovidedforfoampumpstation,combustionenginecanbeusedaspowersourceifitisdifficulttosupplybydoublepowersuppliesordoublecircuits.Forfoampumpstationwithoutstandbypump,nobackuppowerisnecessary.Article3.5.6Waterlevelindicatorshallbeprovidedforthewaterpondinthepumpstation.Thepumpstationshallbeprovidedwithcommunicationdeviceswhichcancommunicatedirectlywiththefirestationorfiresecuritydepartmentoftheunit.ChapterIVSystemAssemblySectionIGeneralRulesArticle4.1.1Thesystemassembliessuchasfoampump,foamproportioner,foamsolutionpressurevessel,foamgenerator,valvesandpiping,shallbetheacceptableproductsinspectedandtestedbythefireproductqualitymonitoringandtestingcenterofnationalgrade.Article4.1.2Thepaintingofmajorsystemassembliesshallconformtothefollowingspecifications:I.Foamsolutionpipe,foampipe,foamliquidtank,foamproportionerandfoamgeneratorshallbepaintedred;II.Foampumpandfeedwaterpipeshallbepaintedgreen.Note:Iftherearemanykindsofpipeandtheirpaintingsareincontradictiontothoseofprocesspipes,correspondingcolorbeltsorcolorringscanbeapplied.SectionIIFoamPumpandFoamProportionerArticle4.2.1Itisrecommendedthatcentrifugalpumpwithsmoothperformancecurvebeselectedforfoampump.Ifringpumptypeproportionerisused,thedesignflowofpumpshallbe1.1timesthatofcalculatedflow.Article4.2.2Vacuumpressuregaugesorvacuummetersshallbeprovidedinthefeedlineoffoampump.Pressuregauge,checkvalveorreturnlinewithcontrolvalveshallbeprovidedinthedischargelineoffoampump.Article4.2.3Ifringpumptypeproportionerisused,thefollowingspecificationsshallbesatisfied:I.Itisrecommendedthatdischargebackpressurebezeroornegative,whenthesuctionpressureis0.7—0.9Mpa,itsdischargebackpressuremaybe0.02—0.03Mpa;www.bzfxw.com II.Thesuctionshallnotbe1mhigherthanthelowestleveloffoamliquidinthetank.III.Ifthedischargebackpressureisgreaterthanzero,precautionsagainstthe`backfeedingofwaterintofoamliquidtankshallbetakeninthesuctionpipe;IV.Itisrecommendedthatnolessthanonebackupproportionerbeprovidedforfoamproportioner.Article4.2.4Ifpressuretypefoamproportionerisused,thefollowingspecificationsshallbesatisfied:I.Theinletpressureshallbe0.6—1.0Mpa;II.Thepressurelossshallbecalculatedas0.1Mpa.Article4.2.5Ifpressurebalancedtypeproportionerisused,thefollowingspecificationsshallbesatisfied:I.Thewaterinletpressureshallbe0.5—1.0Mpa;II.Theinletpressureoffoamliquidshallbegreaterthanthatofwater,howeverthepressuredifferenceshallnotbegreaterthan0.2Mpa;Article4.2.6Whenfoameductorisused,itshallbeconnectedinserieswithfirehose,andtheoutletpressureshallmeettherequirementsoftheinletpressureoffoamdevices.SectionIIIFoamLiquidStorageVesselArticle4.3.1Constantpressurevesselsshallbeselectedwhenringpumporpressure-balanced-foamproportioningprocessisadopted;Pressurevesselshallbeselectedwhenpressuretypefoamproportioningprocessisadopted.Article4.3.2Itisrecommendedthatthevesselbefabricatedbycorrosionresistantmaterials;Whensteelvesselisused,theinnerwallshallbetreatedwithanti-corrosionmeasures.Article4.3.3Itisrecommendedthatconstantpressurevesselsbeofhorizontaltypeorverticalcylindricaltype,levelgauge,rustcleaninghole,feedinghole,manhole,samplinghole,breather,orventpipewithcontrolvalveshallbeprovided.Safetyvalve,rustcleaninghole,feedinghole,manhole,orsamplingholeshallbeprovidedonpressurevessel.SectionIVFoamGeneratorArticle4.4.1Itisrecommendedthatinjectionfoamgeneratorbelocatedevenlyaroundthevessels.Article4.4.2Thehighbackpressurefoamgeneratorshallbelocatedoutofthefire-proofembankment,samplingholeshallbeprovidedintheoutletpipe.SectionVValveandfittingArticle4.5..1Itisrecommendedthatmotor-drivenvalve,pneumaticvalveorhydraulicvalvebeusedifthediameteroffoampumpdischargepipeisgreater300mm.Valvesshallbeprovidedwithclearopening/closingsign.Article4.5.2Steelpipeshallbeusedforfoamandfoamsolutionpipe.Theouterwallofthepipeshallbetreatedwithanti-corrosionmeasuresandasbestosrubbergasketsshallbeusedattheflangeconnections.www.bzfxw.com AppendixITerminologyTerminologyAttachedTable1.1DescriptionDescriptionusedbeforeExplanationLowexpansionairFoamwithexpansionlessthan20whenfoamfoamsolutionissuckedupbyair.0ClassAliquidInflammableliquidLiquidwithaflashpoint<28C.00ClassBliquidInflammable(flammable)Liquidwithaflashpoint≥28Cto60C.liquidInjectionfoamExtinguishingsystemwithfoambeinginjectedextinguishingintothevesselfromabovetheliquidlevel.systemSubmergedExtinguishingsystemwithfoambeinginjectedInjectionfoamintothevesselfrombelowtheliquidlevel.extinguishingsystemFoamsolutionWatersolutionformulatedwithfoamliquidandwaterwithcertainproportion.FixedfoamExtinguishingsystemconsistingoffixedfoamextinguishingpump,foamproportioner,foamgeneratorandsystempiping.Semi-fixedfoamExtinguishingsystemconsistingoffixedfoamextinguishinggenerator,foamvehicleormechanicalpumpandsystemconnectedwithfirehose;orconsistingoffixedfoampump,correspondingpipesandportablefoamgeneratorandconnectedwithfirehose.PortablefoamExtinguishingsystemconsistingoffirevehicleorextinguishingmechanicalfirepump,foamproportioner,portablesystemfoamgeneratorandconnectedwithfirehose.FixedroofvesselVerticalcylindricalvesselwithafixedroof.OuterfloatingroofTheroofofthevesselisfloatingabovethelevelvesselandfloatsupanddownwiththelevel.InnerfloatingroofFixedroofvessel,thereisainnerrooffloatingupvesselanddownwiththelevel.Dual-pantypeThefloatingroofisoffloatingbintype,theinnerfloatingrooffloatingbinisseparatedbyseveraldivisionplates.Single-pantypePartofthefloatingroofisoffloatingbintype.innerfloatingroofShallow-pantypeThefloatingroofisofpanshapewithoutbin.innerfloatingroofFoamsprayingFixedextinguishingsystemusingnozzlestospraysystemfoamHighbackSubmergedinjectionfoamFoamsolutioncansuckupairthroughthisdevicepressurefoamgeneratorandgeneratelowexpansionfoam,certainpressuregeneratorexistsattheoutlet.www.bzfxw.com AppendixIINotesofWordingI.Itisrequiredinthisprovisiontodefinethewordingsusedtoexpressthedegreesofstrictness.Inimplementation,dealwitheachcaseinaccordancewiththefollowingstatementsofwordings:(1).Wordingsusedtoexpressrequirementsthatmustbeverystrictlyfollowedwithoutanydeviationtherefrom.Wordinginpositiveformtobeusedis"shall",andtheequivalentexpressionsare"itisnecessary(requiredto)…","only…ispermitted…".Wordinginnegativeformtobeusedis"shallnot",andtheequivalentexpressionsare"itisnotallowed(permitted,acceptableorpermissible)…".(2).Wordingsusedtoexpresssomethingshallbedoneinthiswayundernormalconditions.Wordinginpositiveformtobeusedis"shall".Wordinginnegativeformtobeusedis"shallnot"or"isrequiredtobenot…","itisnotallowed(permitted,acceptable,permissible)…".(3).Wordingsusedtoexpressiontheactionstepsareallowedwithpossibilitiesforselectionorwhentheconditionsarepermissibleitshouldbedonefirst:Wordinginpositiveformtobeusedis"should"or"may",andtheequivalentexpressionis"itisrecommendedthat…".Wordinginnegativeformtobeusedis"shouldnot",andtheequivalentexpressionis"itisnotrecommended…".II.Wordingof“shallbeexecutedaccordingto…….”or“Shallcomplywiththeprovisionsof…….”isusedwhenotherrelevantcodesandstandardsshallbefollowed.www.bzfxw.com Additionalexplanatorynotes:Namelistoftheunitresponsibleforthecompilationandpreparation,theunitsparticipatinginthepreparationandthemajordraftsmenUnitresponsibleforthepreparation:TianjinFireFightingScientificandResearchInstituteoftheMinistryofPublicSecurityUnitsparticipatinginthepreparation:SINOPECBeijingDesignInstituteSINOPECLuoyanPetrochemicalEngineeringCorporationDaqingDesignandResearchInstituteofChinaNaturalGasCorporationFireFightingBranchofTianjinPublicSecurityBureauMajordraftsmenoftheCode:GanJialin,Yuanjizeng,TangXiaolin,MiYixing,ShiShouwen,JiaYipu,LiSheng,MengXiangping,ZhangFenghe,JiangYongkun,WuLilong,GuanMingjun,HouJianpingwww.bzfxw.com'