【英文标准名称】:StandardTestMethodsforDeterminingLooseandTappedBulkDensitiesofPowdersusingaGraduatedCylinder
【原文标准名称】:利用量筒测定松散和堆粉密度的标准试验方法
【标准号】:ASTMD7481-2009
【标准状态】:现行
【国别】:
【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】:D18.24
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:loosebulkdensity;tappedbulkdensity
【摘要】:Thedatafromtheloosebulkdensitytestcanbeusedtoestimatethesizeofbags,totes,smallbinsorhoppersforthestorageofafixedmassofpowderinitsloosecondition.Itcanalsobeusedtoestimatethemassofpowderthatwillfitinsmallsizecontainerssuchasdrums.Itcannotbeusedtoestimatepowderquantitiesoflargevesselssuchassilos.Valuesofloosebulkdensityobtainedusingthistestmethodshouldbeusedwithcaution,sincetheycanvaryconsiderablydependingontheinitalstateofdispersionofthetestspecimen,height-to-diameterratioofspecimeningraduatedcylinder,drynessofpowder,andotherfactors.Thedatafromthetappedbulkdensitytestcanbeusedtoestimatetheneededvolumeofsmallcontainersholdingafixedmassofpowderthathasbeencompacted.Anexamplewouldbeapackinglinewherevibrationisusedtotamppowdersintoasmallcontainerforeffectivepackingpurposes.Bulkdensityvaluescanvarysignificantlyiftheparticlesizeoftheactualmaterialtobehandledisdifferentthantested.Abulksolidconsistingoflargeandsmallparticlesoftenhashigherbulkdensitiesthanthefineparticlesbythemselves.Forpowders,lowerdensitiesarepossibleifthefineparticlesarefluidizedoraerated.Theresultsofthistestmethodaremostapplicabletocontainerswithvolumesuptoaboutonecubicmeter.Anothermethod(suchasD6683)shouldbeusedwhenconsideringlargersilos.Note18212;Thequalityoftheresultsproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.PracticeD3740wasdevelopedforagenciesengagedinthetestingorinspection(orboth)ofsoilandrock.Assuchitisnottotallyapplicabletoagenciesperformingthisstandard.However,usersofthisstandardshouldrecognizethattheframeworkofPracticeD3740isappropriateforevaluatingthequalityofanagencyperformingthisstandard.Currentlythereisnoknownqualifyingnationalauthoritythatinspectsagenciesthatperformthisstandard.1.1Thistestmethodcoverstheapparatusandproceduresfordeterminingthebulkdensitiesoffreeflowingandmoderatelycohesivepowdersandgranularmaterialsupto3.5mminsizeintheirloose(MethodA)andtapped(MethodB)states.1.2Thistestmethodshouldbeperformedinalaboratoryundercontrolledconditionsoftemperatureandhumidity.1.3ThistestmethodissimilartothoseofTestMethodsB212,D29,andD2854.1.4AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.4.1Theproceduresusedtospecifyhowdataarecollected/recordedorcalculatedinthisstandardareregardedastheindustrystandard.Inadditiontheyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproceduresuseddonotconsidermaterialvariations,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsfortheuserx2019;sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreportedda......
【中国标准分类号】:
【国际标准分类号】:17_060
【页数】:4P.;A4
【正文语种】: