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【英文标准名称】:StandardPracticeforEstimationofHeatSavingsbyAddingThermalInsulationtoBareValvesandFlanges
【原文标准名称】:通过给凸面阀门及法兰增加热绝缘材料评估蓄热量的标准实施规则
【标准号】:ASTMC1129-1989(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1989
【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】:C16.30
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:calculatedenergysavings;heatlossfrompipes;pipesystems;Barevalves/flanges;Flanges/fittings/valves/parts;Heatingsystems;Heatingtests;Heatingtests--thermalinsulation;Heatloss/savings;Insulatedflatsurfaces/pipes;Pipethermalinsulati
【摘要】:Manufacturersofthermalinsulationforvalvestypicallyexpresstheperformanceoftheirproductsinchartsandtablesshowingheatlosspervalve.Thesedataarepresentedforbothbareandinsulatedvalvesofdifferentpipesizes,ANSIclasses,insulationtypes,insulationthicknesses,andservicetemperatures.Additionalinformationoneffectsofwindvelocity,jacketemittance,barevalveemittance,andambientconditionsmayalsoberequiredtoproperlyselectaninsulationsystem.Duetotheinfinitecombinationofpipesizes,ANSIclasses,insulationtypesandthicknesses,servicetemperatures,insulationcovergeometries,surfaceemittances,andambientconditions,itisnotpossibletopublishdataforeachpossiblecase.Usersofthermalinsulationforpipingsystemsfacedwiththeproblemofdesigninglargesystemsofinsulatedpiping,encountersubstantialengineeringcoststoobtaintherequiredthermalinformation.Thiscostcanbesubstantiallyreducedbyboththeuseofaccurateengineeringdatatables,orbytheuseofavailablecomputeranalysistools,orboth.Theuseofthispracticebythemanufacturer,contractor,andusersofthermalinsulationforvalvesandflangeswillprovidestandardizedengineeringdataofsufficientaccuracyandconsistencyforpredictingthesavingsinheatingenergyusebyinsulatingbarevalvesandflanges.Computersarenowreadilyavailabletomostproducersandconsumersofthermalinsulationtopermituseofthispractice.ThecomputerprograminPracticeC680hasbeendevelopedtocalculatetheheatlossperunitlength,orperunitsurfacearea,ofbothbareandinsulatedpipe.Withvaluesforbarevalveorflangesurfaceareas,heatlosscanbeestimated.Byestimatingtheouterinsulationsurfaceareafromaninsulationmanufacturer''sorcontractor''sdrawings,theheatlossfromtheinsulationsurfacecanlikewisebecalculatedbytakingtheproductofheatlossperunitarea(fromprogramsconformingtoPracticeC680)andthevalveorflangeinsulationsurfacearea.Theareaoftheuninsulatedsurfacesmayalsoneedtobeconsidered.TheuseofthispracticerequiresthatthevalveorflangeinsulationsystemmeetsGuideC1094andPracticeC450,whereapplicable.1.1Themathematicalmethodsincludedinthispracticeprovideacalculationalprocedureforestimatingheatlossorheatsavingswhenthermalinsulationisaddedtobarevalvesandflanges.1.2Questionsofapplicabilitytorealsystemsshouldberesolvedbyqualifiedpersonnelfamiliarwithinsulationsystemsdesignandanalysis.1.3Estimatedaccuracyislimitedbythefollowing:1.3.1Therangeandqualityofthephysicalpropertydatafortheinsulationmaterialsandsystem,1.3.2Theaccuracyofthemethodologyusedincalculationofthebarevalveandinsulationsurfaceareas,and1.3.3Thequalityofworkmanship,fabrication,andinstallation.1.4Thisprocedureisconsideredapplicablebothforconventional-typeinsulationsystemsandforremovable/reuseablecovers.Inbothcases,forpurposesofheattransfercalculations,theinsulationsystemisassumedtobehomogenous.1.5Thispracticedoesnotintendtoestablishthecriteriarequiredinthedesignoftheequipmentoverwhichthermalinsulationisused,nordoesthispracticeestablishorrecommendtheapplicabilityofthermalinsulationoverallsurfaces.1.6Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.7Thisstandarddoes......
【中国标准分类号】:Q25
【国际标准分类号】:23_040_60
【页数】:6P.;A4
【正文语种】:英语