DZ/T 0071-1993 地面高精度磁测技术规程
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来源:标准资料网
基本信息
标准名称: | 地面高精度磁测技术规程 |
中标分类: |
矿业 >>
地质矿产勘察与开发 >>
地质矿产勘察与开发综合 |
发布部门: | 中华人民共和国地质矿产部 |
发布日期: | 1993-05-18 |
实施日期: | 1994-01-01 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
出版日期: | 1900-01-01 |
页数: | 平装16开, 页数:25, 字数:46千字 |
适用范围
本规程规定了地面高精度磁测技术设计原则、磁力仪的性能校验、野外实测与资料处理等要求。本规程适用于弱磁性目标物的勘查以及隐伏磁性体在地表产生的弱磁异常研究等工作。
前言
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所属分类: 矿业 地质矿产勘察与开发 地质矿产勘察与开发综合
【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
基本信息
标准名称: | 无规定动物疫病区 口蹄疫监测技术规范 |
发布部门: | 中华人民共和国农业部 |
发布日期: | 2011-09-02 |
实施日期: | 2011-12-01 |
首发日期: | |
作废日期: | |
出版社: | 中国农业出版社 |
出版日期: | 2011-12-01 |
适用范围
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前言
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目录
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引用标准
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所属分类: 综合 标准化管理与一般规定 标准化 质量管理 社会学 服务 公司(企业)的组织和管理 行政 运输 质量 质量管理和质量保证