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【英文标准名称】:StandardPracticeforCalculationandAdjustmentoftheLangelierSaturationIndexforReverseOsmosis
【原文标准名称】:反渗透用估算和校正Langclier饱和指数的标准实施规范
【标准号】:ASTMD3739-2006(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2006
【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】:D19.08
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:CaCO3scale;LangelierSaturationndex;LSI;reverseosmosis;scaling;Calciumcarbonate(CaCO3)scalingproperties;Desalinating(reverseosmosis)devices;Langeliersaturationindex;Reverseosmosis(RO)installations;Wateran
【摘要】:Inthedesignandoperationofreverseosmosisinstallations,itisimportanttopredictthecalciumcarbonatescalingpropertiesoftheconcentratestream.Becauseoftheincreaseintotaldissolvedsolidsintheconcentratestreamandthedifferenceinpassagesforcalciumion,bicarbonateion,andfreeCO2,thecalciumcarbonatescalingpropertiesoftheconcentratestreamwillgenerallybequitedifferentfromthoseofthefeedsolution.ThispracticepermitsthecalculationoftheLangelierSaturationIndexfortheconcentratestreamfromthefeedwateranalysesandthereverseosmosisoperatingparameters.ApositiveLangelierSaturationIndexindicatesthetendencytoformacalciumcarbonatescale,whichcanbedamagingtoreverseosmosisperformance.ThispracticegivesvariousproceduresfortheadjustmentoftheLangeliersaturationindex.ThetendencytoformCaCo3scalecanbesuppressedbytheadditionofantiscalentsorcrystalmodifiers.Suppliersofantisealentsandcrystalmodifierscanprovideinformationonthescaleinhibitionpeformanceofthesetypesofchemical.TheirusemaybeappropriateforreducingscaleformationinROsystems.TheROsystemsuppliershouldbeconsultedpriortotheuseofantisealentsandcrystalmodifierstoensuretheywillnothaveanegativeimpactontheROsystem.1.1ThispracticecoversthecalculationandadjustmentoftheLangeliersaturationindexfortheconcentratestreamofareverseosmosisdevice.Thisindexisusedtodeterminetheneedforcalciumcarbonatescalecontrolintheoperationanddesignofreverseosmosisinstallations.Thispracticeisapplicableforconcentratestreamscontainingxx10to10000mg/Loftotaldissolvedsolids.Forconcentratecontainingover10000mg/LseePracticeD4582.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G04
【国际标准分类号】:07_030
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Environmentaltesting.Part3:backgroundinformation.Section2:combinedtemperature/lowairpressuretests.
【原文标准名称】:环境试验.第3部分:背景信息.第2节:组合温度/低气压试验
【标准号】:NFC20-403-2-1999
【标准状态】:现行
【国别】:法国
【发布日期】:1999-08-01
【实施或试行日期】:1999-08-05
【发布单位】:法国标准化协会(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】:A21
【国际标准分类号】:19_040
【页数】:10P;A4
【正文语种】:其他