ASTM A 53 A 53M-2007(7)

ASTM材料标准

12.2Surfaceimperfectionsthatpenetratemorethan12.5%ofthespeci edwallthicknessorencroachontheminimumwallthicknessshallbeconsidereddefects.Pipewithdefectsshallbegivenoneormoreofthefollowingdispositions:12.2.1Thedefectshallberemovedbygrinding,providedthattheremainingwallthicknessiswithinspeci edlimits,12.2.2TypeSpipeandtheparentmetalofTypeEpipe,exceptwithin1 2in.[13mm]ofthefusionlineoftheelectric-resistance-weldseam,arepermittedtoberepairedinaccordancewiththeweldingprovisionsof12.5.Repairweld-ingofTypeFpipeandtheweldseamofTypeEpipeisprohibited.

12.2.3Thesectionofpipecontainingthedefectshallbecutoffwithinthelimitsofrequirementonlength,or12.2.4Rejected.

12.3Atthepurchaser’sdiscretion,pipeshallbesubjectedtorejectionifsurfacedefectsrepairedinaccordancewith12.2arenotbutappearoveralargeareainexcessofwhatisconsideredaworkmanlike nish.Dispositionofsuchpipeshallbeamatterofagreementbetweenthemanufacturerandthepurchaser.

12.4Fortheremovalofimperfectionsanddefectsbygrinding,asmoothcurvedsurfaceshallbemaintained,andthewallthicknessshallnotbedecreasedbelowthatpermittedbythisspeci cation.Itshallbepermissibletoreducetheoutsidediameteratthepointofgrindingbytheamountsoremoved.12.4.1Wallthicknessmeasurementsshallbemadewithamechanicalcaliperorwithaproperlycalibratednondestructivetestingdeviceofappropriateaccuracy.Inthecaseofadispute,themeasurementdeterminedbyuseofthemechanicalcalipershallgovern.

12.5WeldrepairshallonlybepermittedwiththeapprovalofthepurchaserandinaccordancewithSpeci cationA530/A530M.

12.6The nishedpipeshallbereasonablystraight.

12.7Thepipeshallcontainnodentsgreaterthan10%ofthepipediameteror1 4in.[6mm],whicheverissmaller,measuredasthegapbetweenthelowestpointofthedentandaprolongationoftheoriginalcontourofthepipe.Cold-formeddentsdeeperthan1 8in.[3mm]shallbefreeofsharp-bottomedgouges;itshallbepermissibletoremovethegougesbygrinding,providedthattheremainingwallthicknessiswithinspeci edlimits.Thelengthofthedentinanydirectionshallnotexceedonehalfthespeci edoutsidediameterofthepipe.13.NumberofTests

13.1Exceptasrequiredby13.2,oneofeachofthetestsspeci edinSection7shallbemadeontestspecimenstakenfromonelengthofpipefromeachlotofeachpipesize.Forcontinuous-weldedpipe,eachlotshallcontainnomorethan25tons[23Mg]ofpipeforpipesizesNPS11 2[DN40]andsmaller,andnomorethan50tons[45Mg]ofpipeforpipesizeslargerthanNPS11 2[DN40].Forseamlessandelectric-resistance-weldedpipe,alotshallcontainnomorethanoneheat,andattheoptionofthemanufacturershallcontainnomorethan500lengthsofpipe(asinitiallycutafterthe nalpipe-formingoperation,priortoanyfurthercuttingtotherequiredorderedlengths)or50tons[45Mg]ofpipe.

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13.2Thenumberof atteningtestsforelectric-resistance-weldedpipeshallbeinaccordancewith7.3.3.2or7.3.3.3,whicheverisapplicable.

13.3Exceptasallowedby9.2,eachlengthofpipeshallbesubjectedtothehydrostatictest(seeSection8).

14.Retests

14.1Exceptfor atteningtestsofelectric-resistance-weldedpipe,iftheresultsofamechanicaltestforalotfailtoconformtotheapplicablerequirementsspeci edinSection7,thelotshallberejectedunlesstestsofadditionalpipefromtheaffectedlotofdoublethenumberoriginallytestedaresubse-quentlymadeandeachsuchtestconformstothespeci edrequirements.Onlyoneretestofanylotwillbepermitted.Anyindividuallengthofpipethatconformstothetestrequirementsisacceptable.Anyindividuallengthofpipethatdoesnotconformtothetestrequirementsmayberesubmittedfortestandwillbeconsideredacceptableifteststakenfromeachpipeendconformtothespeci edrequirements.

14.2Electric-Resistance-WeldedPipeProducedinSingleLengths—Ifany atteningtestresultfailstoconformtotherequirementsspeci edin7.3.3,theaffectedsinglelengthshallberejectedunlessthefailedendissubsequentlyretestedusingthesameweldorientationasthefailedtestandasatisfactorytestresultisobtainedbeforethepipe’slengthisreducedbysuchtestingtolessthan80%ofitslengthaftertheinitialcropping.

14.3Electric-Resistance-WeldedPipeProducedinMultipleLengths—Ifany atteningtestresultfailstoconformtotherequirementsspeci edin7.3.3,theaffectedmultiplelengthshallberejectedor atteningtestsshallbemadeusingatestspecimentakenfromeachendofeachindividuallengthinthefailedmultiplelength.Foreachpipeend,suchtestsshallbemadewiththeweldalternatelyat0°and90°fromthelineofdirectionofforce.Individuallengthsareconsideredacceptableifthetestresultsforbothpipeendsconformtothespeci edrequirements.

15.TestMethods

15.1Thetestspecimensandthetestsrequiredbythisspeci cationshallconformtothosedescribedinthelatestissueofTestMethodsandDe nitionsA370.

15.2Eachlongitudinaltensiontestspecimenshallbetakenfromapipeendandshallnotbe attenedbetweenthegagemarks.

15.3Testspecimensforbendtestsand atteningtestsshallbetakenfrompipe.Testspecimensfor atteningtestsshallbesmoothontheendsandfreefromburrs.

15.4Testsshallbeconductedatroomtemperature.16.Lengths

16.1Unlessotherwisespeci ed,pipelengthsshallbeinaccordancewiththefollowingregularpractices:

16.1.1Exceptasallowedby16.1.2and16.1.4,pipelighterthanextra-strongweightshallbeinsingle-randomlengthsof16to22ft[4.88to6.71m],withnotmorethan5%ofthetotalnumberofthreadedlengthsfurnishedbeingjointers(twopiecescoupled

together).