ANSI/ATIS 0100517-1995 综合业务数字网性能参数和对象

上一篇: IEC 60094-2 Corrigendum 1-1995 磁带录音和重放系统.第2部分:校正带.勘误表1
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【英文标准名称】:Heatexchangers.Watertowaterheatexchangersfordistrictheating.Testprocedureforestablishingtheperformance
【原文标准名称】:热交换器.分区供暖用水/水热交换器.确定性能数据的检验程序
【标准号】:DDENV1148-1994
【标准状态】:作废
【国别】:英国
【发布日期】:1994-01-15
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:热工部件;热交换器;数学计算;区域供暖;性能;性能试验;温度测量;水加热器
【英文主题词】:waterheaters;mathematicalcalculations;districtheating;performance;heatengineeringcomponents;temperaturemeasurement;heatexchangers;performancetesting
【摘要】:
【中国标准分类号】:Q83
【国际标准分类号】:27_060_30
【页数】:20P;A4
【正文语种】:英语


【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】: