基本信息
标准名称: | 误码测试仪检定规程 |
英文名称: | Regulation of Verification for PCM Error Tester |
中标分类: |
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发布日期: | 1994-02-01 |
实施日期: | |
首发日期: | |
作废日期: | |
起草单位: | 邮电部通信计量中心 |
出版日期: | |
页数: | 45页 |
适用范围
适用范围:本规程适用于新制造、使用中和修理后的,符合CCITTO.151建议的一、二、三次群误码测试仪的检定。其它同类型仪表的检定可参照本规程进行。
前言
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目录
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引用标准
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所属分类:
【英文标准名称】:StandardPracticeforInnerandOuterDiametersofThermalInsulationforNominalSizesofPipeandTubing
【原文标准名称】:公称尺寸管道和管件用绝热层的内径和外径标准实施规程
【标准号】:ASTMC585-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:C16.20
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:pipethermalinsulationdiameter;pipethermalinsulationdimension;thermalinsulatingmaterials-pipe;thermalinsulatingmaterials-tubing;thermalinsulation;tubingthermalinsulationdiameter;tubingthermalinsulationdimension;Diameter;Insulatedf
【摘要】:Thepurposeofthispracticeistoensuresatisfactoryfitonstandardsizes,toaccommodateradialexpansionofpipesandtubeswhichareheatedafterbeinginsulated,andtominimizethenumberofinsulationsizesandthicknessestobemanufacturedandstocked.Whileitispossibletomanufacturerinsulationtotheserecommendeddimensions,exercisecareinattemptingtonestlayersofdifferentmaterials,orlayerssuppliedbydifferentmanufacturers.Individualmanufacturingprocesseswilloperateatslightlydifferenttolerances.Whiletheproductwillfitthepipe,itispossiblethatitwillnotreadilynestastheouterlayerbetweenthedifferentmaterials,orwithadifferentmanufacturer,andpossiblythesamemanufacturer.Exercisecaretodeterminethesedifferencesbeforespecifyingororderingnestingsizes.Thewiderangeofouterdiameterdimensionaltoleranceswillpreventmanypipeandtubeinsulationsfromnestingforstaggeredjointsordoublelayeredapplications,orbothunlessspecifiedwhenorderedfromthemanufacturer,distributor,orfabricator.4.4Dimensionsinaccordancewiththispracticedonotnecessarilypermitapplicationofonethicknessofpipeinsulationoveranother(NestingorSimplifiedDimensionalSystem)toobtaintotalthicknessesgreaterthanthosemanufacturedassinglelayer,orformultilayerapplicationwhendesired.1.1Thispracticeisintendedasadimensionalstandardforpreformedthermalinsulationforpipesandtubing.1.2Thispracticecoversinsulationsuppliedincylindricalsectionsandlistsrecommendedsinglelayerinnerandouterdiametersofinsulationhavingnominalwallthicknessesfromx00BD;to5in.(13to127mm)tofitoverstandardsizesofpipeandtubing.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.ThevaluesstatedinSIunitsareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q25
【国际标准分类号】:27_220
【页数】:11P.;A4
【正文语种】:英语