BS EN 974-1997 供人用的水处理时用的化学物质.磷酸
时间:2024-05-16 17:56:16 来源: 标准资料网 作者：标准资料网 阅读：9125
【英文标准名称】:Chemicalsusedfortreatmentofwaterintendedforhumanconsumption-Phosphoricacid
【原文标准名称】:供人用的水处理时用的化学物质.磷酸
【标准号】:BSEN974-1997
【标准状态】:作废
【国别】:英国
【发布日期】:1997-12-15
【实施或试行日期】:1997-12-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:纯度;密度;储存;分子量;抽样方法;粘度;加标签;熔点;水;安全措施;水处理;掺和剂;运输;传输;杂质;作标记;沸点;有毒物质;浓度(化学);蒸气压力;含量测定;饮用水;磷酸
【英文主题词】:
【摘要】:
【中国标准分类号】:G77
【国际标准分类号】:71_100_80
【页数】:16P;A4
【正文语种】:英语
【英文标准名称】:CableFlexingforFiberOpticInterconnectingDevices
【原文标准名称】:光纤互连设备用软电缆
【标准号】:ANSI/TIA-455-1B-1998
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:光纤;挠曲蠕变;光波导;互连接
【英文主题词】:Cables;Fibreoptics;Fibres;Flexuralcreep;Interconnection;Opticalwaveguides;Telecommunications
【摘要】:Thisdocumentdescribesatestmethodintendedtodeterminetheabilityoffiberopticinterconnectingdevices,deviceinterfaces,andstrainreliefstowithstandbendingandflexingstressesresultingfromloadsasmightbeexperiencedduringinstallationandserviceconditions.
【中国标准分类号】:M33
【国际标准分类号】:33_180_10
【页数】:
【正文语种】:英语
【英文标准名称】:StandardTestMethodforLinearShrinkageofPreformedHigh-TemperatureThermalInsulationSubjectedtoSoakingHeat
【原文标准名称】:预成型高温热绝缘材料在均热加热情况下的线性收缩的标准试验方法
【标准号】:ASTMC356-2010
【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】:C16.31
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:hightemperatureinsulation;linearchanges;linearity;preformedthermalinsulation;shrinkage;soakingheattest;High-temperaturethermalinsulation;Linearchanges/linearity;Preformedthermalinsulation;Shrinkage;Soaktesting
【摘要】:Linearshrinkage,asusedinthistestmethod,referstothechangeinlineardimensionsthathasoccurredintestspecimensaftertheyhavebeensubjectedtosoakingheatforaperiodof24handthencooledtoroomtemperature.Mostinsulatingmaterialswillbegintoshrinkatsomedefinitetemperature.Usuallytheamountofshrinkageincreasesasthetemperatureofexposurebecomeshigher.Eventuallyatemperaturewillbereachedatwhichtheshrinkagebecomesexcessive.Withexcessiveshrinkage,theinsulatingmaterialhasdefinitelyexceededitsusefultemperaturelimit.Whenaninsulatingmaterialisappliedtoahotsurface,theshrinkagewillbegreatestonthehotface.Thedifferentialshrinkagewhichresultsbetweenthehotterandthecoolersurfacesoftenintroducesstrainsandmaycausetheinsulationtowarp.Highshrinkagemaycauseexcessivewarpageandtherebymayinducecracking,bothofwhichareundesirable.Highshrinkagemayalsoopengapsattheinsulationjointstoanexcessiveextentrenderingtheapplicationlessefficientandmorehazardous.Inordertopredictthelimitofpermissibleshrinkageinservice,thedegreeoflinearshrinkagetobetoleratedbyspecimensofaninsulatingmaterialwhensubjectedtosoakingheatmustbedeterminedfromexperience.Itisrecognizedthatafixedrelationbetweenlinearshrinkageundersoakingheatandactualshrinkageinservicecannotbeestablishedfordifferenttypesofinsulatingmaterials.Generallytheamountofshrinkageincreaseswithtimeofexposure.Theamountandrateofincreasevariesfromonematerialtoanother.Inaddition,thevarioustypesofmaterialsmayhavedifferentamountsofmaximumpermissibleshrinkage.Therefore,eachproductmustdefineitsownspecificlimitsoflinearshrinkageundersoakingheat.1.1Thistestmethodcoversthedeterminationoftheamountoflinearshrinkageandotherchangesthatoccurwhenapreformedthermalinsulatingmaterialisexposedtosoakingheat.Thistestmethodislimitedtopreformedhigh-temperatureinsulationthatisapplicabletohot-sidetemperaturesinexcessof200x00B0;F(93x00B0;C),withtheexceptionofinsulatingfirebrickwhichiscoveredbyTestMethodC210.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q25
【国际标准分类号】:81_080
【页数】:3P.;A4
【正文语种】:英语