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【英文标准名称】:Waste-Determinationofthepermeabilityofanexistinggeologicalformationofaddedorartificiallyreconstitutedmaterials-Open-type,double-ringinfiltrometers.
【原文标准名称】:废弃物.附加的或人工再生材料现有地质组成渗透性的测定.开式双环渗透计
【标准号】:NFX30-418-2007
【标准状态】:作废
【国别】:法国
【发布日期】:2007-07-01
【实施或试行日期】:2007-07-20
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:Z04
【国际标准分类号】:13_030_40;93_020
【页数】:26P.;A4
【正文语种】:其他


【英文标准名称】:Vacuumtechnology-Standardmethodsformeasuringvacuum-pumpperformance-Generaldescription
【原文标准名称】:真空技术.测量真空泵性能的标准方法.一般描述
【标准号】:ISO21360-2007
【标准状态】:作废
【国别】:国际
【发布日期】:2007-06
【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/TC112
【标准类型】:()
【标准水平】:()
【中文主题词】:定义;效率;流量测量;流量率;测量;特性;泵;测试;真空工程;真空泵
【英文主题词】:Definitions;Efficiency;Flowmeasurements;Flowrates;Measurement;Properties;Pumps;Testing;Vacuumengineering;Vacuumpumps
【摘要】:ThisInternationalStandardisabasicstandardwhichdefinesthreedifferentmethodsformeasuringthevolumeflowrateandonemethodeachformeasuringthebasepressure,thecompressionratioandthecriticalbackingpressureofavacuumpump.Thefirstmethodformeasuringthevolumeflowrate(thethroughputmethod)isthebasicconcept,inwhichasteadygasflowisinjectedintothepumpwhiletheinletpressureismeasured.Inpractice,themeasurementofgasthroughputmaybecomplicatedorinexact.Forthisreason,twoothermethodsaredescribedwhichavoidthedirectmeasurementofthroughput.Thesecondmethodformeasuringthevolumeflowrate(theorificemethod)isusedwhenthereisverysmallthroughputoccurringatverysmallinletpressures(inthehighandultra-highvacuum).Itisbasedonmeasuringtheratioofpressuresinatwo-chambertestdomewherethetwochambersareseparatedbyawallwithacircularorifice.Thethirdmethodformeasuringthevolumeflowrate(thepump-downmethod)iswell-suitedforautomatedmeasurement.Itisbasedontheevacuationofalargevessel.Thevolumeflowrateiscalculatedfromtwopressures,beforeandafterapumpinginterval,andfromthevolumeofthetestdome.Differenteffects,suchasleakanddesorptionrates,gascoolingbynearlyisentropicexpansionduringthepumpingintervalandincreasingflowresistanceintheconnectionlinebetweentestdomeandpumpcausedbymolecularflowatlowpressures,influencetheresultsofthepressuremeasurementandtheresultingvolumeflowrate.Thechoiceoftherequiredmeasurementmethodsdependsonthepropertiesofthespecifickindsofvacuumpump,e.g.themeasurementofthecriticalbackingpressureisonlynecessaryforvacuumpumpswhichneedabackingpump.AlldatathatismeasuredonavacuumpumpbutnotdescribedinthisInternationalStandard(e.g.measurementofpowerconsumption)isdefinedinthespecificpumpstandard.
【中国标准分类号】:J78
【国际标准分类号】:23_160
【页数】:27P.;A4
【正文语种】:英语