标准资料网-标准资料免费资源平台

【英文标准名称】:ISOminiaturescrewthreads
【原文标准名称】:ISO微型车螺纹
【标准号】:ISO1501-2009
【标准状态】:现行
【国别】:国际
【发布日期】:2009-05
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC1
【标准类型】:()
【标准水平】:()
【中文主题词】:基本牙形;螺栓;紧配合螺纹;纤芯直径;名称与符号;直径;尺寸公差;尺寸规格;外螺纹;紧固件;精密机械;内螺纹;ISO米制螺纹;ISO微型螺纹;ISO螺纹;极限(数学);机械公差;米制的;米制螺纹;微小;标准直径;中径;剖面图;踏步竖板;标准量器;螺纹形状;螺距;螺纹;公差带;公差(测量)
【英文主题词】:Basicprofiles;Bolts;Close-fitthreads;Corediameter;Designations;Diameter;Dimensionaltolerances;Dimensions;Externalthreads;Fasteners;Finemechanics;Internalthreads;ISOmetricthreads;ISOminiaturescrewthreads;ISOscrewthreads;Limits(mathematics);Mechanicaltolerances;Metric;Metricscrewthreads;Miniature;Nominaldiameters;Pitchdiameter;Profile;Risers;Standardmeasures;Threadforms;Threadpitch;Threads;Tolerancezones;Tolerances(measurement)
【摘要】:
【中国标准分类号】:J04
【国际标准分类号】:21_040_30
【页数】:16P;A4
【正文语种】:英语


【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