ASTMG14-04鋼制管道涂層抗沖擊性的試驗(yàn)方法(落錘試驗(yàn))(精)

1、Designation14-04INTERNATIONALStandardTestMethodforImpactResistanceofPipelineCoatings(FallingWeightTest1ThisstandardisissuedunderthefixeddesignationG14;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicat

2、estheyearoflastreapproval.Asuperscriptepsilon(eindicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheenergyrequiredtorupturecoatingsappliedtopipeunderspecifiedconditionsofimpactfromafallingweight.1.2ThevaluesstatedinSIunitstothreesignificantdec

3、i-malsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregula

4、torylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2G12TestMethodforNondestructiveMeasurementofFilmThicknessofPipelineCoatingsonSteelG62TestMethodsforHolidayDetectioninPipelineCoat-ings2.2SAEStandard:Grade52100Steel33.SummaryofTestMethod3.1Thistestmethodusesafallingfixedweighthavingaspe

5、cifieddiameterimpactsurface,tup,whichisrestrainedverticallyanddroppedfromvaryingheightstoproduceimpactenergiesovertherequiredrange.Electricalinspectionisusedtodetectresultantbreaksinthecoating.Impactresistanceisdeterminedastheamountofenergyrequiredtocausepenetra-tionofthecoatingfilm.4.Significancean

6、dUse4.1Theabilityofapipecoatingtoresistmechanicaldamageduringshipping,handling,andinstallationwilldependuponitsimpactresistance.Thistestmethodprovidesasystematicmeansforscreeningcoatingmaterialswithregardtothisproperty.5.Apparatus5.1Thistestmethodcanbesuccessfullyusedwithimpactapparatusconformingtot

7、hefollowingspecifications:5.1.1TupThetupshallbemadeupfromatupbodyandatupnosehavingacombined,fixedweightof1.361kg(3.00lbandshallbeusedoveradroprangeof0.61to1.22m(2to4ft.Withmostcoatings,a1.361-kg(3.00-lbtupdroppedthroughadistanceof914mm(3ftyieldssuitableresults.Thetupnoseshallhavea15.875-mm(5/8-in.he

8、misphericalhead.NOTE1FrequentreplacementofthetupnosecanbeavoidedifitiscutfromsteelcapableofbeinghardenedtoahardnessofRockwellC/45whileretaininganimpacttoughnessofatleast15ftlb(20.34J.BallbearingsconformingtoSAEGrade52100havealsobeenfoundsuitableforthispurpose.5.1.2DropTubeAtube1.52m(5ftlongshallbeus

9、edtocontainthetupandguideitduringfreefall.Thedroptubeshallbeconstructedofsteel,aluminum,oranyothersuitablyrigidmaterialandinternallysizedtoprovideaminimumoffrictiontothefallingtup.Ascaleshallbeattachedformeasuringtheheightofdroptothenearest2.54mm(0.10in.5.1.3SpecimenHolderThebaseplateoftheapparatuss

10、hallincludeadeviceforpositioningandholdingthepipespecimenonlinewiththeaxisoftheverticaldroptube.NOTE2AnarrangementusingaV-notchvisemadeofmetalwithspringclampisrecommendedforthispurpose.Glancingblows,causedbyanout-of-plumbconditionbetweendroptubeandpipesample,willcauseerratictestresults.5.1.4Apparatu

11、sSupportBoththeapparatusandsampleshallbefirmlysupportedandsecuredtoarigidbasetooptimizeenergytransferfromthetuptothespecimen.5.2AdesignforthetestapparatusappearsinFigs.X1.1-X1.3ofAppendixX1.1ThistestmethodisunderthejurisdictionofASTMCommitteeD01onPaintandRelatedCoatings,Materials,andApplicationsandi

12、sthedirectresponsibilityofSubcommitteeD01.48onDurabilityofPipelineCoatingandLinings.CurrenteditionapprovedNov.1,2004.PublishedNovember2004.Originallyapprovedin1969.Lastpreviouseditionapprovedin1996asG1488(1996e1.2ForreferencedASTMstandards,visittheASTMwebsite, HYPERLINK ,orcontactASTMCustomerService

13、at HYPERLINK mailto:service.For service.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandardsDocumentSummarypageontheASTMwebsite.3AvailablefromSocietyofAutomotiveEngineers(SAE,400CommonwealthDr.,Warrendale,PA15096-0001.CopyrightASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohoc

14、ken,PA19428-2959,UnitedStates.5.3ThicknessGageMeasurementsofcoatingthicknesswillberequiredforthistest,andshallbedoneinaccordancewithTestMethodG12.5.4HolidayDetectorAsuitabledetectorasspecifiedinTestMethodsG62shallbeusedtolocatebreaksinthecoatingfilm.6.TestSpecimen6.1Thetestspecimenshallbea406.4mm(16

15、in.longpieceofSchedule40,60.325mm(2.375in.outsidediametercoatedpipepreparedwithitssurfacepreparationandcoatingproceduresequivalenttothatofproductioncoatedpipe.6.2Sevenspecimensshallberequiredforthetest.7.Conditioning7.1Thespecimenshallbeexposedtoaroomtemperatureof21to25C(70to77Fforaperiodof24hbefore

16、beginningthetest.8.PreliminaryMeasurements8.1MeasuretheappliedcoatingthicknessofeachspecimeninaccordancewithTestMethodG12.8.2Placetestspecimeninsampleholderandlightlyplacetuponsurfaceofthecoating.Adjusteitherthedroptubeortheattachedscalesothatthewingbolt(liftingpinisatthezeromarkofthescale.8.3Makeap

17、reliminarysetofimpactreadingstodeterminetheapproximatestartingpointforthetest.Thisshallbedonebystrikingthefirstspecimenfromaheightsufficienttocausefailureofthecoatingfilm.ConsideranypenetrationafailureifitisdetectablewithasuitableHolidayDetectorasspecifiedinTestMethodsGReducetheheightby50%an

18、dmakeasecondexploratorydropatafreshareaonthepipesurface.Continuetestinginthismanner,withthecorrespondingreductioninheightbetweendrops,untilthecoatingfailstobreak.NOTE3Choosetestlocationsatthespecimensurfaceinarandommannerandkeepatleasta76.2mm(3in.distancebetweenadjacentpointsofimpactandwithin38mm(I1

19、/2in.fromtheends.Choosingtestpointsinanyregularpatternwillbiastheexperimentandintroduceerrorintothetestresults.8.3.2Repeatthetestattheheightimmediatelyprecedingtheoccurrenceofthenonfailuretodetermineifanapproximatelevelforthemeanimpactstrengthhasbeenbracketed.Twosuccessivereversalsofcoatingperforman

20、cebetweenfailureandnonfailurewillgivesufficientindicationthatthepointhasbeenreached.9.Procedure9.1Performthetestataroomtemperatureof21to25C(70to77F.9.2Begintestingfromtheapproximateheightdeterminedin8.2andcorrespondingtothepointatwhichthefirstnonfailurewasregistered.Maintainafixedincrementbetweenadj

21、acenttestingheights.9.3Useasuitabledetector,asspecifiedinTestMethodG6,todeterminepenetrationorlackthereofofthecoatingaftereachindividualimpact.9.4Ifthecoatingfilmispenetratedontheinitialdrop,makethenexttestatthenextlowerheightincrement.Ifthefirstspecimendoesnotfail,makethesecondtestatthenexthigherin

22、crement.9.5Inasimilarmanner,determinetheheightoffallbytheperformanceofthecoatingoneachprecedingdrop.Maintainaconstantheightincrementbetweenreadings.Continuetoapplythisup-and-downmethod4until20successiveimpactread-ingshavebeenmade.10.Calculation10.1Calculatethemeanvalueofimpactstrength,m,ing/cm(orin.

23、/lbasfollows:m5Fh01dSA61DG3W(1where:h0=minimumheightatwhichthelessfrequenteventoccurs,cm(orin.,d=incrementinheightofdrop,cm(orin.,A=sumofthefrequencyofoccurrenceateachheightincrementtimesthenumberofincrementsabovetheh0valueforeachobservationintheNtotal,N=totalnumberofthelessfrequentevent(coatingfail

24、uresornonfailures,andW=tupweight,g(orlb.NOTE4Theminussignisusedwhenthecalculationofthemeanisbasedonthetotalnumberofcoatingfailuresandtheplussignwhenitisbasedonthenonfailures.10.2Calculatethesamplestandarddeviation,s,ingram-centimetres(orinch-poundsasfollows:S51.620dWSNB2A2!N1CD(2where:C=0.737whendis

25、incm,or0.029whendisinin.,d,N,A,andWareasdefinedin10.1,andB=sumofthefrequencyofoccurrenceateachheightincrementtimesthesquareofthenumberofincre-mentsabovetheh0valueforeachobservationintheNtotal.NOTE5Adequatedefinitionofcoatingimpactstrengthwillresultonlyiftheheightincrement,d,hasbeenproperlychosen.Whe

26、ntestingpolymericfilmsintherangefrom0.254to1.016mm(0.010to0.040in.,heightincrementsoffrom5.1to12.7mm(0.2to0.5in.havebeenfoundsuitablewiththe1.361kg(3.0lbtup.Largerincrementsmaybenecessaryforthickermaterials.Ifaftermakingthecalculationsof10.1and10.2,theratiooftheheightincrementtothestandarddeviation(

27、d/sislessthan0.20,thetestshouldberepeatedusingalargervaluefortheincrementd.Thisprocedurewillresultinanimprovedestimateofthecoatingimpactstrength.10.3AnillustrationoftheuseoftheseequationsappearsinAppendixX2.4Thissystemoftesting,nomenclature,andcalculationisdescribedbyDixon,W.J.andMood,A.M.,AMethodfo

28、rObtainingandAnalyzingSensitivityData,JournalAm.StatisticalAssn.,JSTNA,Vol43,March,1948,p.109.11.Report11.1Thereportshallincludethefollowing:11.1.1Completeidentificationofthespecimenincluding:Nameandcodenumberofthecoating,Sizeofpipe,Source,productiondate,andproduction-runnum-ber,Minimum,maximum,anda

29、veragecoatingthick-ness,Dateoftest,andOtherinformationthatmaybepertinent,11.1.2Averageimpactstrengthing/cm(orin./lb,11.1.3Samplestandarddeviationing/cm(orin./lb.12.PrecisionandBias12.1Thereproducibilityoftheimpactresistancedeter-minedbythismethodshouldnotdifferbetweenonelaboratoryandanotherbymoretha

30、n615%.Whenthesameinstrumentisusedbythesameoperator,repeatabilityonthesamesampleshouldnotdiffermorethan615%.Biascannotbedeterminedsincethereisnoacceptablestandardmaterialavailableforthistest.13.Keywords13.1fallingweighttest;impactresistance;pipelinecoatingsAPPENDIXES(NonmandatoryInformationX1.SUGGEST

31、EDDESIGNFORTESTAPPARATUSX1.1AdesignfortheimpacttestapparatusisshowninFigs.X1.1-X1.3KdiMPLEH*勺EPt-SftFIG.X1.1TestApparatusSETKREWAssemblyAPPROX垂.覺(jué)m忒.？Ltb,*.4Kitoss-rhlAKMIWIK5X7rm-06吉_(I.DI，I-yS.BTMMCSyfljL-BUMKmiFORSTU.CAPtsIJOMryll63.50MMSl.-3MM(lWhSPRING9.5ZHMVaiQlA.12170MM旳.$7MM76.2MW(yi-r-削皿WIWI

32、晉iH點(diǎn)BOLTTUPNOSEFIG.X1.2DetailedDesignofTestApparatusTT*弓-QMrftMM|H-87MMSajDiA_3.52MM|耐心丄irS.-STMMi(s/abj-I-(r-LEADCCWETAPFOR3.175MMl?B|ALLENSETSCREW11430MM141/J)65-50MM(2V?11IfrOMM252MMIIoH廠JA巴FORr/5/|fcSTD.BOLT_WELDiZTKMiMilAf)R.gfggCL刪P小期li訃1,；1TTI-TCMM程伽RI4.29HW-I2.7QWH2*1卜9l5fMMLW)jajf曲J3*FOR時(shí)嚴(yán)-

33、，55*-STU.CAPSCREWFIG.X1.3DetailedDesignofTestApparatusG14-04X2.SAMPLECALCULATIONSX2.1Testresultsfor20dropswitha1.361kg(3lbtuparegiveninTableX2.1.TABLEX2.1TestResultsTestNo.12345678910HeightofDrop,in.14.113.814.114.414.113.814.114.414.113.8FailedyesnonoyesyesnonoyesyesyesTestNo.11121314151617181920He

34、ightofDrop,in.13.513.814.113.813.513.813.513.213.513.8FailednonoyesyesnoyesyesnonoyesHeightincrement=0.3in.Failures=11Nonfailures=9Nonfailuresat13.2in.(h0=1;at13.5in.=3;at13.8in.=3;at14.1in.=2A=(031+(133+(233+(332=15B=(0231+(1233+(2233+(3232=3315113.0541.55in.lbm513.210.392meanimpactresistance=41.55in.lb9333215!2S51.62030.2933.051.338in.lbs.9!2Samplestandarddeviation=1.383in.lbFS