【英文标准名称】:Opticalfibrecables-Part2-31:Indoorcables-Detailedspecificationforopticalfibreribboncablesforuseinpremisescabling(IEC60794-2-31:2005);GermanversionEN60794-2-31:2006
【原文标准名称】:光学纤维电缆.第2-31部分:室内电缆.建筑群布缆用光纤带状电缆的详细规范(IEC60794-2-31:2005)
【标准号】:DINEN60794-2-31-2006
【标准状态】:现行
【国别】:德国
【发布日期】:2006-08
【实施或试行日期】:2006-08-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:架空电缆;布线;通信电缆;导(线)管;衰减系数;详细规范;尺寸;电缆;导电体;电气工程;光纤;玻璃纤维电缆;内部电缆;单模纤维;多模纤维;光波导;带状电缆;规范;规范(验收);电信
【英文主题词】:
【摘要】:
【中国标准分类号】:M33
【国际标准分类号】:33_180_10
【页数】:5P;A4
【正文语种】:德语


【英文标准名称】:StandardPracticeforCalculationandAdjustmentofSilica(SiO2)ScalingforReverseOsmosis
【原文标准名称】:为反向渗透标定二氧化硅的计算和校正的标准实施规程
【标准号】:ASTMD4993-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:fouling;reverseosmosis;scaling;silica;solubility;Brackishwater/brines;Concentration(ofelements);Reverseosmosis(RO)installations;Scalecontrol;Seawater(natural/synthetic);Silica;Silica(SiO2)scalingpropoerties
【摘要】:Inthedesignandoperationofreverseosmosisinstallations,itisimportanttopredicttheSiO2scalingpropertiesoftheconcentratestream.BecauseoftheincreaseintheconcentrationofSiO2andthechangeinpH,thescalingpropertyoftheconcentratestreamwillbequitedifferentfromthatofthefeedsolution.Thispracticepermitsthecalculationofthescalingpotentialfortheconcentratestreamfromthefeedwateranalysisandthereverseosmosisoperatingparameters.ScalingbySiO2willadverselyaffectthereverseosmosisperformance.Thispracticegivesvariousproceduresforthepreventionofscaling.Thepresenceofcertainmetals,forexample,Al+3,maysignificantlyalterthesolubilityofSiO2viaformationofinsolublemetalsilicates.Thispracticedoesnotaddressthisphenomena.1.1Thispracticecoversthecalculationandadjustmentofsilica(SiO2)fortheconcentratestreamofareverseosmosissystem.Thecalculationsareusedtodeterminetheneedforscalecontrolintheoperationanddesignofreverseosmosisinstallations.Thispracticeisapplicableforalltypesofreverseosmosisdevices(tubular,spiralwound,andhollowfiber).1.2Thispracticeisapplicabletobothbrackishwatersandseawaters.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P42
【国际标准分类号】:
【页数】:3P.;A4
【正文语种】:英语