【英文标准名称】:StandardPracticeforManualSamplingofStationaryCoalfromRailroadCars,Barges,Trucks,orStockpiles
【原文标准名称】:从有轨电车、驳船、卡车或煤堆手工取样稳态煤的标准实施规程
【标准号】:ASTMD6883-2004
【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】:D05.23
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:取样;汽车;运输车辆;驳船;固定的;水分检验;煤
【英文主题词】:barges;manualsampling;railcars;railroadcars;stockpiles
【摘要】:Theseguidelinesprovideproceduresformanuallycollectinggrosssamplesfrombeneaththeexposedsurfaceofcoalinrailroadcars,barges,trucks,orstockpilestakingintoaccountthewidevarietyofconditionsthatmaybeencountered.Thesamplesarefurtherprocessedforthelaboratorytoprovideestimationsofthecoalquality.Theuseofthispracticeisconditionaluponagreementamongallinterestedpartiesconcerningallrelevantdetailsofsamplecollectionbeforesamplingbegins.Theseinclude,butarenotlimitedto:lotsize;numberandmassofincrements;thesize,shape,andmanipulationoftheincrementcollectiondevices;locationofincrementcollectionsiteorsites;circumstancesunderwhichincrementsarenottobecollectedorsuspended;andsafetyprecautions.Itispreferablethatsuchagreementsbeinwriting.Theuseriscautionedthatsamplessoobtaineddonotrepresentmaterialbelowthepointofpenetration.1.1Thispracticecoversproceduresforobtainingamanualgrosssamplefrombeneaththesurfaceofcoalinrailroadcars,barges,trucks,orstockpiles.Theseproceduresaretobeusedtoprovidegrosssamplesforestimatingthequalityofthecoal.Thegrosssamplesaretobecrushed,divided,andfurtherpreparedforanalysisinaccordancewithPracticeD2013.1.2Thispracticeprovidesinstructionforsamplingbeneaththeexposedsurfacecoaltoadepthofapproximately61cm(24in.).Collectsamplesatthisdepthtogetbelowthesurfaceofthematerial,sincedryingandoxidationmayhaveoccurredat,ornearthesurface.Changesinmoisture,inparticlesize,andinotherpropertiescontinuetooccurdeeperinthecoaland,althoughnotasdrasticasnearthesurface,willcausethemethodtobebiased.Theusershouldreviewtheconditionsofthecoal(weatherconditions,priortransport,settlingtime,andsoforth,see8.1)sothattheinterestedpartiescanagreethatpotentialbiasesarenotoverlygreatorthatsomeadjustmentinspecificationsiswarranted.Sampleincrementscollectedfromthesurfacelayer(s)ofcoalinrailroadcars,barges,orstockpilesareclassifiedcondition"D"(seePracticeD2234,IncrementCollectionClassification).Itisagoodpracticetorequirethat"detailsofsamplingprocedureshallbeagreeduponinadvancebyallpartiesconcerned"whenevercollectionofsampleincrementsfallsundercondition"D."ThispracticeoffersasamplingprocedurethatpartiesmayusetomeetrequirementsofPracticeD2234forcondition"D."ThepracticedoesnotproducesamplesthatsatisfyprecisionrequirementsofPracticeD2234general-purposesampling,orPracticeD2234special-purposesampling.1.3Theuseriscautionedthatsamplesofthistypedonotsatisfytheminimumrequirementsforprobabilitysamplingandassuchcannotbeusedtodrawstatisticalinferencessuchasprecision,standarderror,orbias.1.4Thissamplingmethodisintendedforuseonlywhensamplingbymorereliablemethodsthatprovideaprobabilitysampleisnotpossible.1.5ThequantitiesstatedineitheracceptableSIunitsorininch-poundunitsareregardedseparatelyasstandard.Thequantitiesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother,withoutcombiningquantitiesinanyway.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:D21
【国际标准分类号】:73_040
【页数】:5P.;A4
【正文语种】: