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【英文标准名称】:StandardPracticesforSamplingforParticlesinAerospaceFluidsandComponents
【原文标准名称】:航空航天流体和部件中粒子取样的标准实施规程
【标准号】:ASTMF303-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:E21.05
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:aerospaceapplications;aerospacefluids/propellants;flowingfluidsampling;particulatecontamination;rinsefluidsampling;samplingx2014;aerospacefluids;samplingx2014;electronicmaterials/app
【摘要】:Althoughacleaningactionisimpartedtothetestcomponent,itisnottheintentofthispracticetoserveasacleaningprocedure.Componentsarenormallycleaneraftereachconsecutivetest;thusrepeatedtestsmaybeusedtoestablishprocesslimitsforagivencomponent(Fig.4).Aspecificsetoftestparametersmustbesuppliedbytheagencyspecifyingcleanlinesslimits.Fig.1,Fig.2,andFig.3maybeusedasaguidetoestablishthedesiredparametersoftestfluid,vibration,extraction,andanalysis.ThecurveinFig.4showsthetypicalbehaviorofacomponentwhentestedforcleanlinessseveralconsecutivetimes.Stabilizationgenerallyoccursbeforethefifthsuccessiverun.Thestabilizedregionstartswhereahorizontallinethroughthemaximumstabilizedvalueintersectsthecurve.Theallowablecleanlinesslimitofatestcomponentshouldbebasedonthecleanlinessrequirementsofthesysteminwhichitwillbeusedandtheassignedvalueshouldbegreaterthanthemaximumstabilizedvalue.Whendefiningtheallowablecleanlinesslimits,animportantconsiderationisthattheaccuracyoftheresultsdecreasesastheallowablelimitvalueapproachesthestabilizedvalue.FIG.4ContaminationperTestRunVersusConsecutiveTestRunNumber1.1Thesepracticescoversamplingproceduresforuseindeterminingtheparticlecleanlinessofliquidsandliquidsamplesfromcomponents.Threepractices,A,B,andC,havebeendevelopedonthebasisofcomponentgeometryinordertoencompassthewidevarietyofconfigurations.Thesepracticesestablishguidelinestobeusedinpreparingdetailedproceduresforsamplingspecificcomponents.Note18212;Thetermcleanlinessusedinthesepracticesreferstosolidparticlesintheliquid.Itdoesnotgenerallycoverotherforeignmattersuchasgases,liquids,andproductsofchemicaldegradation.Cleanlinesswithrespecttoparticulatecontaminationdoesnotnecessarilygiveanyindicationoftheothertypesofcontamination.1.2Allcomponents,regardlessofapplication,maybetestedprovided(1)thefluidmediumselectediscompletelycompatiblewiththematerials,packingandfluidusedinthetestcomponent,andtestapparatus,and(2)thefluidishandledinaccordancewiththemanufacturer''srecommendationsandprecautions.Aliquidshallbeusedasthetestfluidmedium.Thesetestfluidsmaybeflushing,rinsing,packing,enduseoperating,orsuitablesubstitutesforenduseoperatingfluids.(Warningx2014;Practicesforsamplingsurfacecleanlinessbythevacuumcleanertechnique(usedoncleanroomgarmentsandlargestoragetanks)samplinggaseousfluidsandhandlinghazardousfluidssuchasoxidizers,acids,propellants,andsoforth,arenotwithinthescopeofthepracticespresented;however,theymaybeincludedinaddendumsorseparatepracticesatalaterdate.Substitutefluidsarerecommendedinplaceofenditemfluidsforpreassemblycleanlinessdeterminationsoncomponentsusinghazardousenditemfluids.Afterobtainingthesample,thesubstitutefluidmustbetotallyremovedfromthetestpartwithparticularcautiongiventothepossibilityoftrappedfluid.Itishazardoustouseasubstitutefluidfortestingassembledpartswherethefluidcanbetrappedindeadends,behindseals,andsoforth.)Note28212;Thewordfluidusedinthesepracticesshallbeassumedtobealiquidunlessotherwisestated.1.3Thecleanlinessofassemblieswithorwithoutmovingpartsmaybedeterminedatthetime......
【中国标准分类号】:V04
【国际标准分类号】:49_080
【页数】:9P.;A4
【正文语种】:英语