ASTM D5540-1994a(2003) 用于在线水取样和分析的流量和温度控制标准规范

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【英文标准名称】:StandardPracticeforFlowControlandTemperatureControlforOn-LineWaterSamplingandAnalysis
【原文标准名称】:用于在线水取样和分析的流量和温度控制标准规范
【标准号】:ASTMD5540-1994a(2003)
【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(ASTM)
【起草单位】:D19.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:取样;水;状态调节;流动;水应用;在线监测系统;在线水取样;流速和流率;样品状态;样品冷却器;规程;控制;分析;温度控制;渣滓;离子沉积作用;在...之上;减压;温度补偿
【英文主题词】:crud;flowcontrol;ionicdeposition;on-lineanalysis;pressurereduction;sampleconditioning;samplecooler;temperaturecompensation;temperaturecontrol;
【摘要】:Sampleconditioningsystemsmustbedesignedtoaccommodateawiderangeofsamplesourcetemperaturesandpressures.Additionally,effortsmustbemadetoensurethattheresultantsamplehasnotbeenalteredduringtransportandconditioningandhasnotsufferedexcessivetransportdelay.Studieshaveshownthatsamplestreamswillexhibitminimaldepositionofionicandparticulatematteronwettedsurfacesatspecificflowrates(1x2013;5).45.1.1Toensurethatthephysicalandchemicalpropertiesofthesamplearepreserved,thisflowratemustbecontrolledthroughoutthesamplingprocess,regardlessofexpectedchangesofsourcetemperatureandpressure,forexample,duringstartuporchangingprocessoperatingconditions.Theneedtouseanalyzertemperaturecompensationmethodsisdependentontherequiredaccuracyofthemeasurement.Facilitiesdealingwithultra-purewaterwillrequirebothcloselycontrolledsampletemperatureandtemperaturecompensationtoensureaccuratemeasurements.Thetemperaturecanbecontrolledbyaddingasecondortrimcoolingstage.Thetemperaturecompensationmustbebasedonthespecificcontaminantsinthesamplebeinganalyzed.Inotherfacilitiesinwhichsomevariationinwaterchemistrycanbetolerated,theuseofeithertrimcoolingoraccuratetemperaturecompensationmayprovidesufficientaccuracyofprocessmeasurements.Thisdoesnotnegatethehighlyrecommendedpracticeofconstanttemperaturesampling,especiallyat25x00B0;C,asthemostprovenmethodofensuringrepeatableandcomparableanalyticalresults.Aseparateclassofanalysisexiststhatdoesnotrequireor,infact,cannotusethefullyconditionedsampleforaccurateresults.Forexample,thecollectionofcorrosionproductsamplesrequiresthatthesampleremainatnearfullsystempressure,butcooledbelowtheflashtemperature,inordertoensurearepresentativecollectionofparticulates.Onlysomeoftheprimaryconditioningcriteriaapplyinthiscase,asinothers.Temperaturecompensationisnotapplicablesincethematerialbeinganalyzedisnotinaliquidstate.1.1Thispracticecoverstheconditioningofaflowingwatersamplefortheprecisemeasurementofvariouschemicalandphysicalparametersofthewater,whethercontinuousorgrab.Thispracticeaddressestheconditioningofbothhigh-andlow-temperatureandpressuresamplestreams,whetherfromsteamorwater.1.2Thispracticeprovidesproceduresfortheprecisecontrolofsampleflowratetominimizechangesofthemeasuredvariable(s)duetoflowchanges.1.3Thispracticeprovidesproceduresfortheprecisecontrolofsampletemperaturetominimizechangesofthemeasuredvariable(s)duetotemperaturechanges.1.4ThevaluesstatedineitherSIorinch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P12
【国际标准分类号】:13_060_10;17_120_10
【页数】:4P.;A4
【正文语种】: