【英文标准名称】:StandardPracticeforFieldLeakTestingofPolyethylene(PE)PressurePipingSystemsUsingGaseousMediaUnderPressure(PneumaticLeakTesting)
【原文标准名称】:使用压力气体介质对聚乙烯(PE)压力管道系统进行现场渗漏试验的标准实施规程(气体渗漏试验)
【标准号】:ASTMF2786-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:F17.40
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:airtest;compressedairtest,pressure;fieldleaktest,;leaktest;polyethylenepipe;pneumaticleaktest
【摘要】:Ifrequiredbytheauthorityhavingjurisdiction,pressurizedgaseousmedialeaktestingmaybeconductedafterinstallationtodiscoverandcorrectleaksorfaultsinanewlyconstructedormodifiedpolyethylenepressurepipingsystembeforeplacingthesysteminservice.Leakageorfaultsusuallyoccuratconnections,joints,andmechanicalsealswheresealingunderpressureisrequired.Safetyisofparamountimportancewhenconductingpressurizedgaseousmedialeaktestsbecausetestingresultsincludenoleaks,leaks,suddenviolentrupture,orcatastrophicfailure.Systemsthatcontainlowerpressureratedornon-pressureratedcomponentsthatcannotbeisolatedorremovedfromexposuretotestpressure,orwheretemporarycapsorclosuresarenotpractical,arenotsuitablefortestinginaccordancewiththispractice.LeakageAllowance8212;Leakageisnotallowedforjointsincludingbutt,socketandsaddlefusion,electrofusion,andrestrainedgas-tightmechanicaljoints.See7.6.Othertypesofjoints,connections,orcomponentshavingsealsinthesystemmayhavealeakageallowance.Contactthejoint,connectionorcomponentmanufacturerforinformation.Poisson-EffectExpansionandContraction8212;Whentestpressureisappliedtoplasticpipingsystemsthathavefullyrestrainedjointssuchasheatfusion,electrofusion,boltedflanges,etc.,reductionofoveralllengthoranincreaseinlongitudinalstressresultsfromdiametricalexpansionofthepipe.Disjoining(pull-out)ofpartiallyrestrainedornon-restrainedconnectionsorjointssuchasbell-and-spigotjointshavinginsufficientresistancetopull-outstressorlengthreductionispossiblewhensuchjointsarein-linewiththetestsection.TopreventPoisson-effectdisjoining,takemeasuressuchasinstallingexternaljointrestraints(diametricalclampsandtie-rods)acrossin-linepartiallyrestrainedornon-restrainedjoints,installingin-linethrustanchorsattheendsoffullyrestrainedpipingsections,orisolatingafullyrestrainedtestsectionfrompipingwithnonrestrainedorpartiallyrestrainedjoints.Note38212;Atensilestressisappliedtoamaterialwillcauseelongationinthedirectionoftheappliedstress,andwillcauseadecreaseindimensionatrightanglestothedirectionoftheappliedstress.TheratioofdecreasetoelongationisthePoissonratio.Undertestpressure,pipingmaterialswillexpandslightlyindiameterandcontractinlengthslightlyaccordingtothePoissonratioofthematerial.1.1Thispracticeprovidesinformationonapparatus,safety,pre-testpreparationandproceduresforconductingfieldtestsofpolyethylenepressurepipingsystemsafterinstallationusinggaseousmediasuchasunodorizedinertnon-toxicgasorair,andapplyingpressuretodetermineifleaksexistinthesystem(pneumaticleaktesting).Thispracticeappliesonlytotestingtodiscoverleakage.Testingforotherpurposessuchastestingtoestablishoperatingpressureisbeyondthescopeofthispractice.1.2Thispracticedoesnotaddressleaktestingusingpressurizedliquids(hydrostatictesting).Forfieldleaktestingusingpressurizedliquids,seePracticeF2164.1.3Leaktestingwithpressurizedgaseousmediashallbeusedonlyifoneofthefollowingconditionsexists:1.3.1Thepipingsystemissodesignedthatitcannotbefilledwithaliquid,or1.3.2Thepipingsystemservicecannottoleratetracesofliquidtestingmedia.1.4Wherehydrostatictestingisspecifiedincontractdocumentsorbyt......
【中国标准分类号】:P94
【国际标准分类号】:23_040_20
【页数】:8P.;A4
【正文语种】:英语