NF E29-692-1991 气瓶.超纯气体用气瓶阀门.尺寸.连接

上一篇: NF E22-391-1991 轴承.基本静载(ISO-76-91)
下一篇: NF E29-751-1991 气瓶.用复合材料绕制成圈加固的气瓶.特性,设计和试验

【英文标准名称】:ResidentialCationExchangeWaterSofteners
【原文标准名称】:民用阳离子交换水软化剂
【标准号】:ANSI/NSF44-1987
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【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】:
【国际标准分类号】:
【页数】:
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【英文标准名称】:StandardTestMethodforOn-LineDeterminationofAnionsandCarbonDioxideinHighPurityWaterbyCationExchangeandDegassedCationConductivity
【原文标准名称】:用阳离子交换和脱气阳离子导电性在线测定高纯度水中阴离子和二氧化碳的标准试验方法
【标准号】:ASTMD4519-1994(2005)
【标准状态】:现行
【国别】:
【发布日期】:1994
【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】:D19.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:含量测定;试验;电导性;二氧化碳;纯度;监督(认可);水
【英文主题词】:anionelectricalconductivity;carbondioxide;cationconductivity;degassedcationconductivity;electricalconductivity;highpuritywater;reboiledconductivity
【摘要】:Thistestmethodcanbeausefuldiagnostictoolinmeasuringtheimpuritiesanddetectingtheirsourcesinhighpuritywater,thesteamcondensateofhighpressurepowerplants,andintheprocesswaterofcertainindustriesrequiringwaterofthehighestpurityattainable.Themeasurementofsuchimpuritiesismostimportanttotheseindustriessinceplantoutagesorproductcontaminationcanresultfromeventssuchascondenserleakage.Also,waterqualitydeviationscanoccurfromcondensatepolishingandmakeupwaterequipmentmalfunctions.Thecontinuousmeasurementandtrendsprovidedbythistestmethodareofparticularinterestandcanindicatetheneedforcorrectionsinwatertreatingoroperatingproceduresandequipment.Theequipmentforthistestmethodcanbeconsideredmoreruggedandadaptabletoinstallationunderplantoperatingconditionsthanthemoreaccuratelaboratorymethods,suchasionchromatographyandatomicabsorption.1.1Thison-linetestmethodincludeshydrogenexchangeanddegassingbyboilingandprovidesmeansfordetermininganions(suchasCl,SO4,NO3,andF)atlevelsaslowas2g/L(2ppb)andcarbondioxideatthelevelof0.01to10mg/L(ppm)at25Cinhighpuritywaterandsteamcondensatebymeasuringelectricalconductivity.1.2Theconductivityofallanions(exceptOH)isdeterminedandnottheconductivityofanindividualanionifmorethanoneispresent.Ifonlyoneanionispresent(suchasClorSO4),referencetoandorprovidesthechlorideorsulfateandCO2concentration.1.3Thistestmethodhasbeenimprovedinaccuracybyusingamodernmicroprocessorinstrumentforconductivityandtemperaturemeasurementandappropriatetemperaturecompensationalgorithmsforcompensationto25C.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G04
【国际标准分类号】:17_220_20
【页数】:7P.;A4
【正文语种】: