【英文标准名称】:Communicationcables-Part2-24:commondesignrulesandconstruction-PEsheathing.
【原文标准名称】:通信电缆.第2-24部分:通用设计规则和结构.聚乙烯铠装
【标准号】:NFC93-540-2-24-2002
【标准状态】:现行
【国别】:法国
【发布日期】:2002-05-01
【实施或试行日期】:2002-05-20
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:装箱;铠装化合物;规则;控制设备;电信;设计;材料;通信电缆;规范(验收);护套电缆;绝缘;聚乙烯;聚乙烯;包装;光学的;电缆;对称的;同轴电缆;光波导;传播技术;显影;护壳;生产
【英文主题词】:
【摘要】:
【中国标准分类号】:K13
【国际标准分类号】:29_035_20;33_120_10
【页数】:25P;A4
【正文语种】:其他


【英文标准名称】:StandardTestMethodforEvaluatingtheOxidativeResistanceofCrosslinkedPolyethylene(PEX)TubingandSystemstoHotChlorinatedWater
【原文标准名称】:评估交联聚乙烯(PEX)管件和系统对热加氯水的氧化耐受性的标准试验方法
【标准号】:ASTMF2023-2010
【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】:F17.40
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Chlorinatedwater;Crosslinkedpolyethylene(PEX)pipe/tube;Hotchlorinatedwater;ORP(oxidationreductionpotential);Oxidationtesting--plastics;PEX/AL/PEXpipe/tube;Thermoplasticpipe/tube/fittings--specifications
【摘要】:Environmentoroxidativetime-to-faildataderivedfromthistestmethod,analyzedinaccordancewithSection13,aresuitableforextrapolationtotypicalend-usetemperaturesandhoopstresses.Theextrapolatedvalue(s)providesarelativeindicationoftheresistanceofthetestedPEXtubingorsystemtotheoxidativeeffectsofhot,chlorinatedwaterforconditionsequivalenttothoseconditionsunderwhichthetestdatawereobtained.Theperformanceofamaterialorpipingproductunderactualconditionsofinstallationanduseisdependentuponanumberoffactorsincludinginstallationmethods,usepatterns,waterquality,natureandmagnitudeoflocalizedstresses,andothervariablesofanactual,operatinghot-and-coldwaterdistributionsystemthatarenotaddressedinthistestmethod.Assuch,theextrapolatedvaluesdonotconstitutearepresentationthataPEXtubeorsystemwithagivenextrapolatedtime-to-failurevaluewillperformforthatperiodoftimeunderactualuseconditions.1.1Thistestmethoddescribesthegeneralrequirementsforevaluatingthelong-term,chlorinatedwater,oxidativeresistanceofcross-linkedpolyethylene(PEX)tubingproducedinaccordancewithSpecificationF876orPEXtubing/fittingsystemsinaccordancewithSpecificationF877usedinhot-and-coldwaterdistributionsystemsbyexposuretohot,chlorinatedwater.Thistestmethodoutlinestherequirementsofapressurizedflow-throughtestsystem,typicaltestpressures,test-fluidcharacteristics,failuretype,anddataanalysis.Note18212;Otherknowndisinfectingsystems(chlorinedioxide,ozone,andchloramines)arealsousedforprotectionofpotablewater.Free-chlorineisthemostcommondisinfectantinusetoday.APPIresearchprojectexaminedtherelativeaggressivenessoffreechlorineandchloraminesonPEXpipes,bothatthesame4.0ppmconcentrationandthesametesttemperatures.Theresultsofthetestingshowedpipefailuretimesapproximately40%longerwhentestedwithchloraminescomparedtotestingwithfreechlorine,atthetestedconditions.Basedontheseresults,thedatasuggeststhatchloraminesarelessaggressivethanfreechlorinetoPEXpipes.1.2Guidelinesandrequirementsfortesttemperatures,testhoopstresses,andothertestcriteriahavebeenestablishedbypriortestingofPEXtubingproducedbythethreemostcommoncommercialmethodsofcross-linking:silane,peroxide,andelectron-beam(seeNote2).OtherrelatedsystemcomponentsthattypicallyappearinaPEXhot-and-coldwaterdistributionsystemcanbeevaluatedwiththePEXtubing.WhentestingPEXtubingandfittingsasasystem,itisrecommendedthattheanticipatedend-usefittingtype(s)andmaterial(s)beincludedinthetestcircuitsinceitisknownthatsomefittingtypesandmaterialscanimpactfailuretimes.Specimensusedshallberepresentativeofthepipingproduct(s)andmaterial(s)underinvestigation.Note28212;Theproceduresdescribedinthistestmethod(withsomemodificationsoftesttemperaturesorstresses,orboth)havebeenusedtoevaluatepipesmanufacturedfrompolybutylene(PB),polyethylene(PE),polypropylene(PP),multilayer(polymer-metalcomposite),copper,andstainlesssteel.1.3ThistestmethodisapplicabletoPEXtubingandsystemsusedfortransportofpotablewatercontainingfree-chlorinefordisinfectingpurposes.Theoxidizingpotentialofthetest-fluidspecifiedinthistestmethodexceedsthattypicallyfoundinpotablewatersystemsacrosstheUnitedStates.1.4Thevaluesstatedininch-pou......
【中国标准分类号】:Q81
【国际标准分类号】:23_040_20
【页数】:9P.;A4
【正文语种】:英语