【英文标准名称】:Statisticalaspectsofsamplingfrombulkmaterials-Part2:Samplingofparticulatematerials
【原文标准名称】:块材料抽样的统计方面第2部分：颗粒材料的抽样
【标准号】:ISO11648-2-2001
【标准状态】:现行
【国别】:国际
【发布日期】:2001-10
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC69
【标准类型】:()
【标准水平】:()
【中文主题词】:散装物料;试样制备;统计学;试样;材料特性;散装货物;定义;预混材料;试样;抽样方法;取样;统计方法分析
【英文主题词】:Bulkgoods;Bulkmaterials;Definitions;Materialbehaviour;Premixedmaterials;Samples;Sampling;Samplingmethods;Specimenpreparation;Statisticalmethodsofanalysis;Statistics;Testspecimens
【摘要】:ThispartofISO11648establishesthebasicmethodsforsamplingparticipatematerialsinbulk(e.g.ores,mineralconcentrates,coal,industrialchemicalsinpowderorgranularform,andagriculturalproductssuchasgrain)frommovingstreamsandstationarysituations,includingstopped-beltsampling,toprovidesamplesformeasuringoneormorevariablesinanunbiasedmannerandwithaknowndegreeofprecision.Thevariablesaremeasuredbychemicalanalysisand/orphysicaltesting.Thesesamplingmethodsareapplicabletomaterialsthatrequireinspectiontoverifycompliancewithproductspecificationsorcontractsettlements,tocalculatethevalueofthelotmeanofameasurablequantityasabasisforsettlementbetweentradingpartners,ortoestimatethesetofvariablesandvariancesthatdescribesasystemorprocedure.Stopped-beltsamplingisthereferencemethodagainstwhichothersamplingproceduresarecompared.Dynamicsamplingfrommovingstreamsisthepreferredmethodwherebyasamplingdevice(calledacutter)ispassedthroughthestreamoftheparticulatematerial.Acompletecross-sectionofthemovingstreamcanberemovedasaprimaryincrementataconveyorbelttransferpointwithafalling-streamcutter,orremovedfromthebeltwithacross-beltcutter.Inbothcases,theselectionandextractionofincrementscanbedescribedbyaone-dimensionaidynamicsamplingmodel.Staticsamplingofbulkmaterialfromstationarysituations,suchasstockpiles,railorroadwagons,theholdsofshipsandbarges,silos,andevencomparativelysmallvolumes,isusedonlywheresamplingfrommovingstreamsisnotpossible.Suchsamplingfromthree-dimensionallotsispronetosystematicerrors,becausesomepartsofthelotusuallyhavereducedornochanceofbeingcollectedforthegrosssample.Thisisinviolationoftherequirementofthethree-dimensionalsamplingmodelthatallpartshaveanequalprobabilityofbeingcollected.TheproceduresdescribedinthispartofISO11648forsamplingfromstationarylotsofbulkparticulatematerialwithimplementssuchasmechanicalaugersmerelyminimizesomeofthesystematicsamplingerrors.Forthesereasons,thispartofISO11648isprimarilyconcernedwithdynamicsamplingfrommovingstreamsorstopped-beltstaticsamplingfromconveyorbeltsandisbasedonasamplingmodelforone-dimensionallots.Nonetheless,proceduresforstaticsamplingfromthree-dimensionallotsareprovidedwherethesesituationscannotbeavoided.ThispartofISO11648isconcernedwiththemethodsofsamplingparticulatematerialsinbulkwiththeobjectiveofobtainingunbiasedmeasurementsofoneormorevariablesofthematerialwithaknowndegreeofprecision.However,itdoesnotprovidemethodsfordecidingwhethertoacceptorrejectabulkmateriallotwithspecifieddegreesofriskofacceptingasub-standardlot,orofrejectingwhatisinfactanacceptablelot.Theselatterproceduresareusuallycalledacceptancesamplingorsamplinginspectionmethods.
【中国标准分类号】:A82
【国际标准分类号】:03_120_30
【页数】:102P.;A4
【正文语种】:英语