1、ErratatoASME B31.12-2019Hy drogen Piping and PipelinesPa ra gra ph GR-3.9.2 wa s inad v ertently omitted fr omASME B31.12-2019,pa ge 48.The corr ect ed pa ge follows th is cover sheet.THE AMERICA N SOCIETY OF MECHANICA L ENGINEERSTwo Park A v enue,New York,NY 10016-5990February 2020 GR-3.9FORMINGOFP
2、IPECOMPONENTSPipemaybebentandcomponentsmaybeformedbyanyhotorcoldmet hodthatissuitableforthematerial,t heintendedservice,andtheseverityofthebendingorformingprocess.Whenselectingmat erialforhy drogenservice,considerationshallbegiventotheeffectsofcoldworking,whichmaypromotelowerresist ancetoHE,whilehot
3、work ingenhancesresist ancet oHE.Thefinishedsurfaceshallbefreeofcrack sandsubst ant iallyfreefrombuckling.Thicknessafterbendingorformingshallbenotlesst hanthatrequiredbytheengineeringdesign.GR-3.9.1BendingRequir ements(a)Flattening.Flatteningofabend,thedifferencebetweenmaximumandminimumdiametersatan
4、ycrosssection,shallnotexceed8%ofnominaloutsidediamet erforinternalpressureand3%forext ernalpres-sure.Removalofmet alshallnotbeusedtoachievet heserequirements.(b)BendingTemperature(1)Coldbendingofferrit icmat erialsshallbedoneatatemperaturebelowt hetransformat ionrange.(2)Hotbendingshallbedoneatat em
5、perat ureabov ethetransformationrangeandinanycasewithinatemperaturerangeconsistentwiththematerialandt heint endedservice.(c)C or r ugat edandOtherBends.Dimensionsandconfigurationshallconformt oadesignqualifiedinaccor-dancewit hpara.IP-3.8.2orpara.PL-3.7,asapplicable.(d)HotBendingandFormi ng.Aft erho
6、tbendingandforming,heatt reat mentisrequiredforP-Nos.1,3,4,5A,and5Bmaterialsinallthicknesses.DurationsandtemperaturesshallbeinaccordancewithTableGR-3.6.1-1.(e)ColdBendingandForming.Aft ercoldbendingandforming,heatt reat mentisrequired(forallt hick nesses,andwithtemperatureanddurationasgiveninTableGR
7、-3.6.1-1)w henanyoft hefollow ingcondit ionsexist:(1)forP-Nos.1t hroug h5Aand5Bmat erials,w heret hemaximumcalculat edfiberelongat ionafterbendingorformingexceeds50%ofspecifiedbasicminimumelonga-t ion(int hedirect ionofsev erestforming)fortheappli-cablespecification,grade,andthickness.Thisrequiremen
8、tmaybewaivedifitcanbedemonst rat edt hattheselectionofpipeandthechoiceofbendingorformingprocessprovideassurancet hat,int hefinishedcondition,themostseverelystrainedmaterialretainsatleast10%elongat ion.(2)foranymat erialrequiringimpactt est ing,w heret hemaximumcalculat edfiberelongat ionafterbending
9、orformingwillex ceed5%.(3)w henspecifiedint heengineeringdesign.GR-3.9.2Post-Hea tTr eatmentGR-3.1019HARDNESSTESTINGHardnesst est ingshallbeconductedforweldingproce-durequalificationtestsforthosematerialsw ithaccep-tancecrit eriadescribedinTableGR-3.10-1.Basemetalforw eldingprocedurequalificationtes
10、t sshallbemadefromthesamebasemetalspecification(sameP-NumberandGroupNumber),similarinchemistry,andinthesameheattreatmentconditionasspecifiedforthepiping.Thethicknessofbasemetalcouponsshallnotbelesst hant hepiping.(a)Method(1)Thehardnesssurveyshallbeperformedonatransverseweldcrosssectionthathasbeenpo
11、lishedandetchedt oident ifytheweldmetal,fusionline,andHAZ.(2)Thehardnesst estshallbecarriedoutinaccor-dancew it hASTME92usinga10-k gload.Ot herhardnesst est ingmet hodsforweldingprocedurequalificat ionmaybeusedwhenpermit t edbytheengineeringdesign.(3)TwoV ick ershardnesst raversesoft heweldjointshou
12、ldbemadeonaweldsampleintheminimumPW HTcondit ion.Thesehardnesstrav ersesshouldbeperformedat1.5mm(116in.)fromt heint ernalandext ernalsurfacesasshowninFigureGR-3.10-1.TheHAZreadingsshouldincludelocat ionsascloseaspossibleapprox imat ely0.2mm(0.008in.)totheweldfusionline.Eacht raverseincludes10hardnes
13、sreadingsforat otalof20hardnessreadingsperw eldsample.(b)Acceptanc eCriteri a(1)HardnessmeasurementsshallnotexceedthelimitsofTableGR-3.10-1aftertherequiredPWHT.Ot herhardnesst estinglimit smaybeusedifspecifiedint heengineeringdesig n.(2)Thehardnessdat ashallbereport edont hePQ R.Ta bleGR-3.10-119Har
14、dnessTestingA cceptanceCriteriaBaseMetalP-No.Note(1)BaseMetalGroupV ickersHV10Max.HardnessNot e(2)1Carbonsteel2353A lloysteels,Cr12%2354A lloysteels,12%Cr2%2355A,5BA lloysteels,214%Cr10%248NOTE:(1)P-NumberfromA SMEBPV C,SectionIX,Q W/Q B-422.(2)Whenotherhardnesstestingmethodsareused,theacceptancecriteriashallbeequiv alenttotheseV ick ersHV10v alues.ASMEB31.12-201948Post-heatt reatment,w henrequiredforpipecompo-nentsafterbendingorforming,shallbeperformedinaccordancewit hpara.GR-3.6,includingTableGR-3.6.1-1.
