【英文标准名称】:StandardTestMethodforThermalStabilityofOrganicHeatTransferFluids
【原文标准名称】:有机导热传输液体热稳定性的标准试验方法
【标准号】:ASTMD6743-2006
【标准状态】:现行
【国别】:
【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】:D02.L0.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:热力工程;传热液体;传热介质;材料试验;试验;热稳定性
【英文主题词】:heattransferfluids;thermaldegradation;thermalfluids;thermalstability
【摘要】:Heattransferfluidsdegradewhenexposedtosufficientlyhightemperatures.Theamountofdegradationincreasesasthetemperatureincreasesorthelengthofexposureincreases,orboth.Duetoreactionsandrearrangement,degradationproductscanbeformed.Degradationproductsincludehighandlowboilingcomponents,gaseousdecompositionproducts,andproductsthatcannotbeevaporated.Thetypeandcontentofdegradationproductsproducedwillchangetheperformancecharacteristicsofaheattransferfluid.Inordertoevaluatethermalstability,itisnecessarytoquantitativelydeterminethemasspercentagesofhighandlowboilingcomponents,aswellasgaseousdecompositionproductsandthosethatcannotbevaporized,inthethermallystressedheattransferfluid.Thistestmethoddifferentiatestherelativestabilityoforganicheattransferfluidsatelevatedtemperaturesintheabsenceofoxygenandwaterundertheconditionsofthetest.Theusershalldeterminetohisownsatisfactionwhethertheresultsofthistestmethodcorrelatetofieldperformance.Heattransferfluidsinindustrialplantsareexposedtoavarietyofadditionalinfluencingvariables.Interactionwiththeplantrsquo;materials,impurities,heatbuild-upduringimpairedflowconditions,thetemperaturedistributionintheheattransferfluidcircuit,andotherfactorscanalsoleadtochangesintheheattransferfluid.Thetestmethodprovidesanindicationoftherelativethermalstabilityofaheattransferfluid,andcanbeconsideredasonefactorinthedecision-makingprocessforselectionofafluid.Theaccuracyoftheresultsdependsverystronglyonhowcloselythetestconditionsarefollowed.Thistestmethoddoesnotpossessthecapabilitytoquantifyorotherwiseassesstheformationandnatureofthermaldecompositionproductswithintheunstressedfluidboilingrange.Decompositionproductswithintheunstressedfluidboilingrangemayrepresentasignificantportionofthetotalthermaldegradation.1.1Thistestmethodcoversthedeterminationofthethermalstabilityofunusedorganicheattransferfluids.Theprocedureisapplicabletofluidsusedforthetransferofheatattemperaturesbothaboveandbelowtheirboilingpoint(referstonormalboilingpointthroughoutthetextunlessotherwisestated).Itisapplicabletofluidswithmaximumbulkoperatingtemperaturebetween260176;C(500176;F)and454176;C(850176;F).Theprocedureshallnotbeusedtotestafluidaboveitscriticaltemperature.Inthistestmethod,thevolatiledecompositionproductsareincontinuouscontactwiththefluidduringthetest.Thistestmethodwillnotmeasurethethermalstabilitythreshold(thetemperatureatwhichvolatileoilfragmentsbegintoform),butinsteadwillindicatebulkfragmentationoccurringforaspecifiedtemperatureandtestingperiod.Becausepotentialdecompositionandgenerationofhighpressuregasmayoccurattemperaturesabove260176;C(500176;F),donotusethistestmethodforaqueousfluidsorotherfluidswhichgeneratehigh-pressuregasatthesetemperatures.1.2DINNorm51528coversatestmethodthatissimilartothistestmethod.1.3Theapplicabilityofthistestmethodtosiloxane-basedheattransferfluidshasnotbeendetermined.1.4si-value;Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see7.2,8.8,8.9,and8.10.
【中国标准分类号】:G71;J75
【国际标准分类号】:27_060_30;71_100_99
【页数】:5P.;A4
【正文语种】: