Designation:A139/A139M−16StandardSpecificationforElectric-Fusion(Arc)-WeldedSteelPipe(NPS4andOver)1ThisstandardisissuedunderthefixeddesignationA139/A139M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversfivegradesofelectric-fusion(arc)-weldedstraight-seamorhelical-seamsteelpipe.PipeofNPS4(Note1)andlargerwithnominal(average)wallthicknessof1.0in.[25.4mm]andlessarecovered.Listingofstandardizeddimensionsareforreference(Note2).Thegradesofsteelarepipemillgradeshavingmechanicalpropertieswhichdifferfromstandardplategrades.Thepipeisintendedforconveyingliquid,gas,orvapor.NOTE1—ThedimensionlessdesignatorNPS(nominalpipesize)hasbeensubstitutedinthisstandardforsuchtraditionaltermsas“nominaldiameter,”“size,”and“nominalsize.”NOTE2—AcomprehensivelistingofstandardizedpipedimensionsiscontainedinASMEB36.10M.NOTE3—Thesuitabilityofpipeforvariouspurposesissomewhatdependentonitsdimensions,properties,andconditionsofservice.Forexample,forhigh-temperatureserviceseeapplicablecodesandSpecifi-cationA691.1.2Thevaluesstatedineitherinch-poundunitsorinSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesineachsystemarenotexactequivalents;therefore,eachsystemistobeusedindependentlyoftheother.2.ReferencedDocuments2.1ASTMStandards:2A370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA691SpecificationforCarbonandAlloySteelPipe,Electric-Fusion-WeldedforHigh-PressureServiceatHighTemperaturesA751TestMethods,Practices,andTerminologyforChemi-calAnalysisofSteelProducts2.2AmericanWeldingSocietyStandard:3AWSB2.1StandardforWeldingProcedureandPerfor-manceQualificationsWeldingHandbook,Vol1,8thed2.3ASMEStandards:4ASMEB36.10MWeldedandSeamlessWroughtSteelPipeASMEB36.19MStainlessSteelPipeASMEBoilerandPressureVessel...
