ASTM A 53 A 53M-2007(4)

ASTM材料标准

7.3.4Continuous-WeldedPipe—Atestspecimenatleast4in.[100mm]inlengthshallbe attenedcoldbetweenparallelplatesinthreesteps.Theweldshallbelocatedat90°fromthelineofdirectionofforce.Duringthe rststep,whichisatestforductilityoftheweld,exceptasallowedby7.3.5,7.3.6,and7.3.7,nocracksorbreaksontheinside,outside,orendsurfacesattheweldshallbepresentbeforethedistancebetweentheplatesislessthanthreefourthsofthespeci edoutsidediameterofthepipe.Asasecondstep,the atteningbecontinuedasatestforductilityawayfromtheweld.Duringthesecondstep,exceptasallowedby7.3.6and7.3.7,nocracksorbreaksontheinside,outside,orendsurfacesawayfromtheweldshallbepresentbeforethedistancebetweentheplatesislessthan60%ofthespeci edoutsidediameterofthepipe.Duringthethirdstep,whichisatestforsoundness,the atteningshallbecontinueduntilthetestspecimenbreaksortheoppositewallsofthetestspecimenmeet.Evidenceoflaminatedorunsoundmaterialorofincompleteweldthatisrevealedbythe atteningtestshallbecauseforrejection.7.3.5Surfaceimperfectionsinthetestspecimenbefore attening,butrevealedduringthe rststepofthe atteningtest,shallbejudgedinaccordancewiththe nishrequirementsinSection12.

7.3.6Super cialrupturesasaresultofsurfaceimperfec-tionsshallnotbecauseforrejection.

7.3.7ForpipewithaD-to-tratiolessthan10,becausethestrainimposedduetogeometryisunreasonablyhighontheinsidesurfaceatthe6and12o’clocklocations,cracksatsuchlocationsshallnotbecauseforrejection.

8.HydrostaticTest

8.1Thehydrostatictestshallbeapplied,withoutleakagethroughtheweldseamorthepipebody.

8.2Plain-endpipeshallbehydrostaticallytestedtotheapplicablepressuregiveninTableX2.2,andthreaded-and-coupledpipeshallbehydrostaticallytestedtotheapplicablepressuregiveninTableX2.3.Itshallbepermissible,atthediscretionofthemanufacturer,toperformthehydrostatictestonpipewithplainends,withthreadsonly,orwiththreadsandcouplings;anditshallalsobepermissibletotestpipeineithersinglelengthsormultiplelengths.

NOTE4—Thehydrostatictestpressuresgivenhereinareinspectiontestpressures,arenotintendedasabasisfordesign,anddonothaveanydirectrelationshiptoworkingpressures.

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nondestructiveelectrictestinaccordancewithPracticesE213,E273,E309,orE570.Eachlengthofelectric-resistance-weldedpipeNPS2[DN50]orlargerandproducedonahot-stretch-reducingmillshallbetestedwithanondestructiveelectrictestthatinpsectsthefullvolumeofthepipeinaccordancewithPracticesE213,E309,orE570.

9.1.2UltrasonicandElectromagneticInspection—Anyequipmentutilizingtheultrasonicorelectromagneticprinciplesandcapableofcontinuousanduninterruptedinspectionoftheweldseamshallbeused.Theequipmentshallbecheckedwithanapplicablereferencestandardasdescribedin9.1.3atleastonceeveryworkingturnornotmorethan8htodemonstrateitseffectivenessandtheinspectionprocedures.Theequipmentshallbeadjustedtoproducewell-de nedindicationswhenthereferencestandardisscannedbytheinspectionunitinamannersimulatingtheinspectionoftheproduct.

9.1.3ReferenceStandards—Thelengthofthereferencestandardsshallbedeterminedbythepipemanufacturer,andtheyshallhavethesamespeci eddiameterandthicknessastheproductbeinginspected.Referencestandardsshallcontainmachinednotches,oneontheinsidesurfaceandoneontheoutsidesurface,oradrilledhole,asshowninFig.1,attheoptionofthepipemanufacturer.Thenotchesshallbeparalleltotheweldseam,andshallbeseparatedbyadistancesufficienttoproducetwoseparateanddistinguishablesignals.The1 8-in.[3.2-mm]holeshallbedrilledthroughthewallandperpen-diculartothesurfaceofthereferencestandardasshowninFig.1.Careshallbetakeninthepreparationofthereferencestandardtoensurefreedomfrom nsorotheredgeroughness,ordistortionofthepipe.

NOTE5—ThecalibrationstandardsshowninFig.1areconvenientstandardsforcalibrationofnondestructivetestingequipment.Thedimen-sionsofsuchstandardsarenottobeconstruedastheminimumsizesofimperfectionsdetectablebysuchequipment.

8.3Theminimumhydrostatictestpressurerequiredtosatisfytherequirementsspeci edin8.2neednotexceed2500psi[17200kPa]forpipeNPS3[DN80]orsmaller,or2800psi[19300kPa]forpipelargerthanNPS3[DN80];however,themanufacturerhastheoptionofusinghighertestpressures.Forallsizesofseamlesspipeandelectric-resistance-weldedpipe,thehydrostatictestpressureshallbemaintainedforatleast5s.

9.NondestructiveElectricTest9.1TypeEPipe:

9.1.1Exceptforpipeproducedonahot-stretchreducingmill,theweldseamofeachlengthofelectric-resistance-weldedpipeNPS2[DN50]orlargershallbetestedwitha

9.1.4AcceptanceLimits—Table3givestheheightofaccep-tancelimitsignalsinpercentoftheheightofsignalsproducedbyreferencestandards.ImperfectionsintheweldseamthatproduceasignalgreaterthantheacceptancelimitsignalgiveninTable3shallbeconsideredadefectunlessthepipemanufacturercandemonstratethattheimperfectiondoesnotreducetheeffectivewallthicknessbeyond12.5%ofthespeci edwallthickness.

9.2TypeSPipe—Asanalternativetothehydrostatictestattheoptionofthemanufacturerorifspeci edinthepurchaseorder,thefullbodyofeachseamlesspipeshallbetestedwithanondestructiveelectrictestinaccordancewithPracticeE213,E309,orE570.Insuchcases,eachlengthsofurnishedshallincludethemandatorymarkingoftheletters“NDE.”Exceptasallowedby9.2.6.2,itistheintentofthisnondestruc-tiveelectrictesttorejectpipewithimperfectionsthatproducetestsignalsequaltoorgreaterthanthoseproducedbytheapplicablecalibrationstandards.

9.2.1Ifthenondestructiveelectrictesthasbeenperformed,thelengthsshallbemarkedwiththeletters“NDE.”Thecerti cation,ifrequired,shallstateNondestructiveElectricTestedandshallindicatewhichofthetestswasapplied.Also,thelettersNDEshallbeappendedtotheproductspeci cationnumberandgradeshownonthe

certi cation.