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【英文标准名称】:StandardGuideforMutualInductanceBridgeApplicationsforWallThicknessDeterminationsinBoilerTubing
【原文标准名称】:测定锅炉管壁厚用互感电桥的标准指南
【标准号】:ASTME2337-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:bridgecircuit;inductancemeasurement;mutualinductancebridge;wallthickness
【摘要】:Theprimaryadvantageofamutualinductancebridgeisitsabilitytomakewallthicknessmeasurementsquickly.Sincesurfacecontaminants(ashandslag)arenotferromagnetic,theydonotinterferewiththeelectromagneticmeasurement.Asaresult,thesurfacerequiresnopreparation.Sinceawidevarietyofsteelsareemployedinaboiler,anin-situstandardizationusingthematerialundermeasurementasthereferenceisadequate.1.1Thisguidedescribesaprocedureforobtainingrelativewallthicknessindicationsinferromagneticandnon-ferromagneticsteelsusingthemutualinductancebridgemethod.Theprocedureisintendedforusewithinstrumentscapableofinducingtwosubstantiallyidenticalmagneticfieldsandnotingthechangeininductanceresultingfromdifferingamountsofsteel.Itisusedtodistinguishacceptablewallthicknessconditionsfromthosewhichcouldplacetubularvesselsorpipingatriskofburstingunderhightemperatureandpressureconditions.1.2ThisguideisintendedtosatisfytwogeneralneedsforusersofindustrialMutualInductanceBridge(MIB)equipment:(1)theneedforatutorialguideaddressingthegeneralprinciplesofMutualInductanceBridgesastheyapplytoindustrialpiping;and(2)theneedforaconsistentsetofMIBperformanceparameterdefinitions,includinghowtheseperformanceparametersrelatetoMIBsystemspecifications.Potentialusersandbuyers,aswellasexperiencedMIBexaminers,willfindthisguideausefulsourceofinformationfordeterminingthesuitabilityofMIBforparticularexaminationproblems,forpredictingMIBsystemperformanceinnewsituations,andfordevelopingandprescribingnewscanprocedures.1.3ThisguidedoesnotspecifytestobjectsandtestproceduresforcomparingtherelativeperformanceofdifferentMIBsystems;nordoesittreatelectromagneticexaminationtechniques,suchasthebestselectionofscanparameters,thepreferredimplementationofscanprocedures,theanalysisofimagedatatoextractwallthicknessinformation,ortheestablishmentofaccept/rejectcriteriaforanewobject.1.4Standardpracticesandmethodsarenotwithinthepurviewofthisguide.Thereaderisadvised,however,thatexaminationpracticesaregenerallypartandapplicationspecific,andindustrialMIBusageisnewenoughthatinmanyinstancesaconsensushasnotyetemerged.ThesituationiscomplicatedfurtherbythefactthatMIBsystemhardwareandperformancecapabilitiesarestillundergoingsignificantevolutionandimprovement.Consequently,anattempttoaddressgenericexaminationproceduresiseschewedinfavorofprovidingathoroughtreatmentoftheprinciplesbywhichexaminationmethodscanbedevelopedorexistingonesrevised.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatoryrequirementspriortouse.
【中国标准分类号】:J98
【国际标准分类号】:27_060_30
【页数】:5P.;A4
【正文语种】: