【英文标准名称】:StandardPracticeforElectromagnetic(Eddy-Current)ExaminationofCopperandCopper-AlloyTubes
【原文标准名称】:铜及铜合金管的电磁(涡流)检验
【标准号】:ASTME243-1997(2004)e1
【标准状态】:现行
【国别】:
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.07
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:金属;无缝管;铜合金;工艺;涡流试验;电磁试验;有色金属;有色金属;无损检验;铜;合金;试验;管
【英文主题词】:electromagnetic(eddycurrent)testing;NDT;nondestructivetesting;copper;tubing
【摘要】:Eddy-currentexaminationisanondestructivemethodoflocatingdiscontinuitiesinaproduct.Signalscanbeproducedbydiscontinuitieslocatedeitherontheexternalorinternalsurfaceofthetubeorbydiscontinuitiestotallycontainedwithinthewalls.Sincethedensityofeddycurrentsdecreasesnearlyexponentiallyasthedistancefromtheexternalsurfaceincreases,theresponsetodeep-seateddefectsdecreases.Someindicationsobtainedbythismethodmaynotberelevanttoproductquality;forexample,arejectsignalmaybecausedbyminutedentsortoolchattermarksthatarenotdetrimentaltotheenduseoftheproduct.Irrelevantindicationscanmaskunacceptablediscontinuities.Relevantindicationsarethosewhichresultfromnonacceptablediscontinuities.Anyindicationabovetherejectlevelthatisbelievedtobeirrelevantshallberegardedasunacceptableuntilitisdemonstratedbyre-examinationorothermeanstobeirrelevant(see10.3.2).Eddy-currentexaminationsystemsaregenerallynotsensitivetodiscontinuitiesadjacenttotheendsofthetube(endeffect).On-lineeddy-currentexaminingwouldnotbesubjecttoendeffect.Discontinuitiessuchasscratchesorseamsthatarecontinuousanduniformforthefulllengthofthetubemaynotalwaysbedetected.1.1Thispracticecoverstheproceduresthatshallbefollowedineddy-currentexaminationofcopperandcopper-alloytubesfordetectingdiscontinuitiesofaseveritylikelytocausefailureofthetube.Theseproceduresareapplicablefortubeswithoutsidediametersto31/8in.(79.4mm),inclusive,andwallthicknessesfrom0.017in.(0.432mm)to0.120in.(3.04mm),inclusive,orasotherwisestatedinASTMproductspecifications;orbyotherusersofthispractice.Theseproceduresmaybeusedfortubesbeyondthesizerangerecommended,uponcontractualagreementbetweenthepurchaserandthemanufacturer.1.2Theproceduresdescribedinthispracticearebasedonmethodsmakinguseofencirclingannulartestcoilsystems.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Note1-Thispracticemaybeusedasaguidelinefortheexamination,bymeansofinternalprobetestcoilsystems,ofinstallationsusingtubularproductswheretheoutersurfaceofthetubeisnotaccessible.Forsuchapplications,thetechnicaldifferencesassociatedwiththeuseofinternalprobecoilsshouldberecognizedandaccommodated.Theeffectofforeignmaterialsonthetubesurfaceandsignalsduetotubesupportsaretypicalofthefactorsthatmustbeconsidered.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H26
【国际标准分类号】:23_040_15(NON-FERROUSMETALPIPES)
【页数】:5P.;A4
【正文语种】: