ASTM A 53 A 53M-2007(6)

ASTM材料标准

exceeding12.5%ofthespeci edwallthicknessofthepipeor0.012in.[0.3mm],whicheveristhegreater.

9.2.4.3LongitudinalNotch—Anotch0.031in.[0.8mm]orlessinwidthshallbemachinedinaradialplaneparalleltothepipeaxisontheoutsidesurfaceofthepipe,toadepthnotexceeding12.5%ofthespeci edwallthicknessofthepipeor0.012in.[0.3mm],whicheveristhegreater.Thelengthofthenotchshallbecompatiblewiththetestingmethod.

9.2.4.4Compatibility—Thecalibrationstandardsinthecali-brationpipeshallbecompatiblewiththetestingequipmentandthemethodbeingused.

9.2.5For uxleakagetesting,thelongitudinalcalibrationreferencenotchesshallbestraight-sidednotchesmachinedinaradialplaneparalleltothepipeaxis.Forspeci edwallthicknesseslessthan0.500in.[12.7mm],outsideandinsidenotchesshallbeused.Forspeci edwallthicknessesequaltoorgreaterthan0.500in.[12.7mm],onlyanoutsidenotchshallbeused.Thenotchdepthshallnotexceed12.5%ofthespeci edwallthickness,or0.012in.[0.3mm],whicheveristhegreater.Thenotchlengthshallnotexceed1in.[25mm],andthenotchwidthshallnotexceedthenotchdepth.Outsidediameterandinsidediameternotchesshallbelocatedsufficientlyaparttoallowseparationandidenti cationofthesignals.

9.2.6Pipecontainingoneormoreimperfectionsthatpro-duceasignalequaltoorgreaterthanthesignalproducedbythecalibrationstandardshallberejectedortheareaproducingthesignalshallberejected.

9.2.6.1Testsignalsproducedbyimperfectionsthatcannotbeidenti ed,orproducedbycracksorcrack-likeimperfec-tions,shallresultinrejectionofthepipe,unlessitisrepairedandretested.Tobeaccepted,thepipeshallpassthesamespeci cationtesttowhichitwasoriginallysubjectedandtheremainingwallthicknessshallnothavebeendecreasedbelowthatpermittedbythespeci cation.Itshallbepermissibletoreducetheoutsidediameteratthepointofgrindingbytheamountsoremoved.

9.2.6.2Itshallbepermissibletoevaluatetestsignalspro-ducedbyvisualimperfectionsinaccordancewiththeprovi-sionsofSection12.Afewexamplesofsuchimperfectionsarestraightenermarks,cuttingchips,scratches,steeldiestamps,stopmarks,orpipereducerripple.

9.2.7ThetestmethodsdescribedinSection9arenotnecessarilycapableofinspectingtheendportionofpipes.Thisconditionisreferredtoasendeffect.Thelengthoftheendeffectshallbedeterminedbythemanufacturerand,ifspeci edinthepurchaseorder,reportedtothepurchaser.

10.PermissibleVariationsinWeight(Mass)and

Dimensions

10.1Weight(Mass)—Theweight(mass)ofthepipeshallnotvarymorethan610%fromitsspeci edweight(mass),asderivedbymultiplyingitsmeasuredlengthbyitsspeci edweight(mass)perunitlength,asgiveninTableX2.2orTableX2.3,orascalculatedusingtherelevantequationinASMEB36.10M.

NOTE6—ForpipeNPS4[DN100]orsmaller,theweight(mass)toleranceisapplicabletotheweights(masses)ofthecustomaryliftsofpipeasproducedforshipmentbythemill.ForpipelargerthanNPS4[DN100],whereindividuallengthsareweighed,theweight(mass)toleranceis

applicabletotheindividuallengths.

10.2Diameter—ForpipeNPS11 2[DN40]orsmaller,theoutsidediameteratanypointshallnotvarymorethan61 64in.[0.4mm]fromthespeci edoutsidediameter.ForpipeNPS2[DN50]orlarger,theoutsidediametershallnotvarymorethan61%fromthespeci edoutsidediameter.

10.3Thickness—Theminimumwallthicknessatanypointshallbenotmorethan12.5%underthespeci edwallthickness.TheminimumwallthicknessoninspectionshallconformtotherequirementsgiveninTableX2.4.

11.EndFinish

11.1Iforderedwithplainends,thepipeshallbefurnishedtothefollowingpractice,unlessotherwisespeci ed.

11.1.1NPS11 2[DN40]orSmaller—Unlessotherwisespeci edinthepurchaseorder,end nishshallbeattheoptionofthemanufacturer.

11.1.2LargerthanNPS11 2[DN40]:

11.1.2.1Pipeofstandard-weightorextra-strongweight,orinwallthicknesslessthan0.500in.[12.7mm],otherthandoubleextra-strongweightpipe,shallbeplain-endbeveledwithendsbeveledtoanangleof30°,+5°,-0°,measuredfromalinedrawnperpendiculartotheaxisofthepipe,andwitharootfaceof1 16in.61 32in.[1.6mm60.8mm].

11.1.2.2Pipewithaspeci edwallthicknessgreaterthan0.500in.[12.7mm],andalldoubleextra-strongweightpipe,shallbeplain-endsquarecut.

11.2Iforderedwiththreadedends,thepipeendsshallbeprovidedwithathreadinaccordancewiththegagingpracticeandtolerancesofANSIB1.20.1.Forstandard-weightpipeNPS6[DN150]orsmaller,refertoTableX3.1forthreadingdata.Forstandard-weightpipeNPS8[DN200]orlargerandallsizesofextra-strongweightpipeanddoubleextra-strongweightpipe,refertoTableX3.2forthreadingdata.ThreadedpipeNPS4[DN100]orlargershallhavethreadprotectorsontheendsnotprotectedbyacoupling.

11.3Iforderedwithcouplings,oneendofeachlengthofpipeshallbeprovidedwithacouplingmanufacturedinaccordancewithSpeci cationA865.ThecouplingthreadsshallbeinaccordancewiththegagingpracticeofANSIB1.20.1.Thecouplingshallbeappliedhandling-tight,unlesspower-tightisspeci edinthepurchaseorder.Couplingsaretobemadeofsteel.Taper-tappedcouplingsshallbefurnishedonallthreadedpipeNPS21 2[DN65]orlarger.ForpipesmallerthanNPS21 2[DN65],itisregularpracticetofurnishstraight-tappedcouplingsforstandard-weightpipeandtaper-tappedcouplingsforextra-stronganddoubleextra-strongweightpipe.Iftaper-tappedcouplingsarerequiredforstandard-weightpipesmallerthanNPS21 2[DN65],itisrecommendedthatlinepipethreadsinaccordancewithAPISpeci cation5Bbeordered.Thetaper-tappedcouplingspro-videdonlinepipeinsuchsizesmaybeusedonmill-threadedstandard-weightpipeofthesamesize.

12.Workmanship,Finish,andAppearance

12.1Thepipemanufacturershallexploreasufficientnum-berofvisualsurfaceimperfectionstoprovidereasonableassurancethattheyhavebeenproperlyevaluatedwithrespectto

depth.

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