DIN ETS 300587-1-1995 欧洲数字移动电话远程通信系统(阶段2):第1部分:基础站系统-移动-服务转换中心(BSS-MSC)的接口:一般特性;英文版本ETS300587-1:1994

上一篇: DIN ETS 300350-1995 综合业务数字网络(ISDN).电路交换承载业务用基本呼叫控制程序.功能能力和信息流
下一篇: DIN ETS 300584-1995 欧洲数字移动电话远程通信系统(阶段2).使用同步承载电路性能的终端适配功能(TAF);英文版本ETS300584:1994

【英文标准名称】:StandardPracticeforQualificationofaCombinationofSqueezeTool,Pipe,andSqueeze-OffProcedurestoAvoidLong-TermDamageinPolyethylene(PE)GasPipe
【原文标准名称】:为避免聚乙烯燃气管长期受损用挤压工具、管和挤出工序组合的鉴定标准实施规范
【标准号】:ASTMF1734-2003(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:F17.60
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:damage;gasflow;pipe;polyethylene;squeeze;squeeze-off;tubing;Damageassessment;Gasflow;Long-termbehavior/performance;Polyethylene(PE);Polyethylene(PE)pipe;Polyethylene(PE)tube;Squeeze-offmaterials/applications
【摘要】:Squeeze-offiswidelyusedtotemporarilycontroltheflowofgasinPEpipe.Squeezetoolsvarydependingonthesizeofthepipeandthedesignofthetool.Squeeze-offproceduresvarydependingonthetooldesign,pipematerial,andenvironmentalconditions.Experienceindicatesthatsomecombinationsofpolyethylenematerial,temperature,tooldesign,wallcompressionpercentageandprocedurecancausedamageleadingtofailure.Studiesofpolyethylenepipeextrudedinthelate1980sandthereaftershowthatdamagetypicallydoesnotdevelopwhenthewallcompressionpercentageis30%orless,whentemperaturesareabove50x00B0;F(10x00B0;C),andwhenclosureandreleaseratesaretypicaloffieldconditionsforscrew-driventools.WithtoolsmeetingSpecificationF1563,acceptableflowcontrolattypicalgasservicepressuresisachievedatwallcompressionpercentagesbetween10and20%forpipediameterslessthan6in.,Becausedamagedoesnotdevelopinthesematerialsatsuchsqueezelevels,thereferencescitedindicatethatsqueeze-offflowcontrolpracticesusingtoolsmeetingSpecificationF1563andqualifiedproceduresmeetingPracticeF1041areeffectiveforsmallerpipesizes.,Note38212;SpecificationF1563providesaprocedureforevaluatingtoolflowcontrolperformance.Thispracticeprovidesamethodtoqualifyacombinationofsqueezetool,pipesizeandmaterial,andsqueeze-offproceduretoensurethatlong-termdamagedoesnotoccur.Thispracticeisusefulforpolyethylenegaspipemanufacturedbefore1975,forneworrevisedpolyolefingaspipematerials,forpipediametersof8in.orabove,forneworrevisedsqueezetooldesigns,andforneworrevisedsqueeze-offprocedures.1.1Thispracticecoversqualifyingacombinationofasqueezetool,apolyethylenegaspipe,andasqueeze-offproceduretoavoidlong-termdamageinpolyethylenegaspipe.Qualifyingisconductedbyexaminingtheinsideandoutsidesurfacesofpipespecimensatandnearthesqueezetodeterminetheexistenceoffeaturesindicativeoflong-termdamage.Ifindicativefeaturesareabsent,sustainedpressuretestinginaccordancewithSpecificationD2513isconductedtoconfirmtheviabilityofthesqueeze-offprocess.Forassistancewithspecimenexamination,anAdjunct,ADJF1734,isavailablefromASTM.1.2Thispracticeisappropriateforanycombinationofsqueezetool,PEgaspipeandsqueeze-offprocedure,andisparticularlyappropriateforpre-1975Polyethylene(PE)pipe,andforpipesizesof8in.orabove,becauseofagreaterpossibilityoflong-termdamage.1.3Thispracticeisforusebysqueeze-toolmanufacturers,pipemanufacturersandgasutilitiestoqualifysqueezetoolsmadeinaccordancewithSpecificationF1563;andsqueeze-offproceduresinaccordancewithGuideF1041withpipemanufacturedinaccordancewithSpecificationD2513.1.4Governingcodesandprojectspecificationsshouldbeconsulted.Nothinginthispracticeshouldbeconstruedasrecommendingpracticesorsystemsatvariancewithgoverningcodesandprojectspecifications.1.5Whereapplicableinthisguide,x201C;pipex201D;shallmeanx201C;pipeandtubing.x201D;1.6Units8212;Thevaluesstatedininch-poundunitsaretoberegardedasstandard.Thevaluesgiv......
【中国标准分类号】:P94
【国际标准分类号】:23_040_20
【页数】:4P.;A4
【正文语种】:英语

标准名称：	煤矿水中铅的测定方法 原子吸收分光光度法
中标分类：	环境保护 >> 环境保护采样、分析测试方法 >> 水环境有毒物质分析方法
替代情况：	被MT/T 361-2007代替
发布日期：	1994-08-31
实施日期：	1994-12-01
首发日期：
作废日期：	2004-08-17
起草单位：	四川煤田地质研究所
出版日期：
页数：	5页

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