【英文标准名称】:StandardPracticeforExaminationofSeamless,Gas-Filled,PressureVesselsUsingAcousticEmission
【原文标准名称】:用声音排放法检验无缝、充气的压力容器的标准试验方法
【标准号】:ASTME1419-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E07.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acousticemission;flawsinsteelvessels;gaspressurevessels;seamlessgascylinders;seamlesssteelcylinders;seamlessvessels;Acousticemission(AE)testing--metals/metallicmaterials;Flawdetection;Gascylinders;Gaspressuresystems/applicat
【摘要】:Becauseofsafetyconsiderations,regulatoryagencies(forexample,U.S.DepartmentofTransportation)requireperiodicexaminationsofvesselsusedintransportationofindustrialgases(seeSection49,CodeofFederalRegulations).TheAEexaminationhasbecomeacceptedasanalternativetothecommonhydrostaticprooftest.Inthecommonhydrostatictest,volumetricexpansionofvesselsismeasured.AnAEexaminationshouldnotbeusedforaperiodofoneyearafteracommonhydrostatictest.SeeNote2.Note28212;TheKaisereffectrelatestodecreasedemissionthatisexpectedduringasecondpressurization.Commonhydrostatictestsusearelativelyhighpressure(167%ofnormalservicepressure).(SeeSection49,CodeofFederalRegulations.)IfanAEexaminationisperformedtoosoonaftersuchapressurization,theAEresultswillbeinsensitivetoalowerexaminationpressure(thatis,thelowerpressurethatisassociatedwithanAEexamination).Pressurization:Generalpracticeinthegasindustryistouselowpressurizationrates.Thispracticepromotessafetyandreducesequipmentinvestment.TheAEexaminationsshouldbeperformedwithpressurizationratesthatallowvesseldeformationtobeinequilibriumwiththeappliedload.Typicalcurrentpracticeistouseratesthatapproximate500psi/h(3.45MPa/h).Gascompressorsheatthepressurizingmedium.Afterpressurization,vesselpressuremaydecayasgastemperatureequilibrateswithambientconditions.Emissionfromflawsiscausedbyflawgrowthandsecondarysources(forexample,cracksurfacecontactandcontainedmillscale).Secondarysourcescanproduceemissionthroughoutvesselpressurization.Whenpressurewithinavesselislow,andgasisthepressurizingmedium,flowvelocitiesarerelativelyhigh.Flowinggas(turbulence)andimpactbyentrainedparticlescanproducemeasurableemission.Consideringthis,acquisitionofAEdatamaycommenceatsomepressuregreaterthanstartingpressure(forexample,1/3ofmaximumexaminationpressure).MaximumTestPressure8212;Seriousflawsusuallyproducemoreacousticemission(thatis,moreevents,eventswithhigherpeakamplitude)fromsecondarysourcesthanfromflawgrowth.Whenvesselsarepressurized,flawsproduceemissionatpressureslessthannormalfillpressure.Amaximumexaminationpressurethatis10%greaterthannormalfillpressureallowsmeasurementofemissionfromsecondarysourcesinflawsandfromflawgrowth.PressurizationSchedule8212;Pressurizationshouldproceedatratesthatdonotproducenoisefromthepressurizingmediumandthatallowvesseldeformationtobeinequilibriumwithappliedload.Pressureholdsarenotnecessary;however,theymaybeusefulforreasonsotherthanmeasurementofAE.ExcessbackgroundnoisemaydistortAEdataorrenderthemuseless.Usersmustbeawareofthefollowingcommonsourcesofbackgroundnoise:highgas-fillrate(measurableflownoise);mechanicalcontactwiththevesselbyobjects;electromagneticinterference(EMI)andradiofrequencyinterference(RFI)fromnearbybroadcastingfacilitiesandfromothersources;leaksatpipeorhoseconnections;andairbornesandparticles,insects,orraindrops.Thispracticeshouldnotbeusedifbackgroundnoisecannotbeeliminatedorcontrolled.1.1Thispracticeprovidesguidelinesforacousticemission(AE)examinationsofseamlesspressurevessels(tubes)ofthetypeusedfordistributionorstorageofindustrialgases.1.2Thispracticerequirespressurizationtoalevelgreaterthanno......
【中国标准分类号】:A82
【国际标准分类号】:23_020_30
【页数】:7P.;A4
【正文语种】:英语


【英文标准名称】:Acoustics;measurementofsoundinsulationinbuildingsandofbuildingelements;part2:determination,verificationandapplicationofprecisiondata;technicalcorrigendum1
【原文标准名称】:声学建筑物和建筑构件的隔声测量第2部分:精确数据的测定、检验和应用技术勘误1
【标准号】:ISO140-2TechnicalCorrigendum1-1993
【标准状态】:现行
【国别】:国际
【发布日期】:1993-11
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC43
【标准类型】:()
【标准水平】:()
【中文主题词】:保真(度);结构构件;声学试验;声学;隔音;测定;声学测量;建筑物;元部件;试验
【英文主题词】:components;soundinsulation;tests;testing;acoustics;determination;acoustictesting;structuralmembers;buildings;fidelity;acousticmeasurement
【摘要】:Replaces"r"by"R"inequation(5).
【中国标准分类号】:P31
【国际标准分类号】:7610;0280
【页数】:1P;A4
【正文语种】:英语