基本信息
| 标准名称： | 高压整流管峰值管压降、反向峰值压降及整流电流的测试方法 |
| 英文名称： | Methods of measurement for peak voltage drop of tube, reverse peak voltage drop of tube and rectifying current of high-voltage rectifier tubes |
| 中标分类： |
综合 >>
标准化管理与一般规定 >>
技术管理 |
| 发布日期： | 1973-02-26 |
| 实施日期： | 1973-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 1页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 综合 标准化管理与一般规定 技术管理
【英文标准名称】:Cathodicprotectionforfixedsteeloffshorestructures
【原文标准名称】:海上固定钢结构的阴极保护
【标准号】:BSEN12495-2000
【标准状态】:现行
【国别】:英国
【发布日期】:2000-05-15
【实施或试行日期】:2000-05-15
【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】:海水;电流的;表面防护;近海建设工程;水下建筑工程;交付使用;电解镀层;覆层;阳极;监督(认可);阴极保护;钢;钢结构;近海工程;文献工作;安装;防腐蚀;定义;安全;材料
【英文主题词】:
【摘要】:ThisEuropeanStandarddefinesthemeanstobeusedtocathodicallyprotectthesubmergedareasoffixedsteeloffshorestructuresandappurtenances.1StructuralpartsThisEuropeanStandarddefinestherequirementsforthecathodicprotectionoffixedstructures,includingsubseaproductionandrelatedprotectivestructureswhetherconnectedornottoeachotherbypipelinesand/orwalkways.Italsocoversthesubmergedareasofappurtenancesattachedtothestructure,whentheseareelectricallyconnectedtothestructure.Itdoesnotcoverthecathodicprotectionoffloatingstructuressuchasships,semi-submersibleunits,orelongatedstructuressuchaspipelinesorcables.ThisEuropeanStandardconcernsonlythecathodicprotectionofexternalsurfaces,incontactwiththeseawaterorwiththeseabed.Itcoverstheimmersedorburiedexternalsurfacesofthejacket,conductorpipes,wellcasings,piles,J-tubes,productionorutilityrisers,etc.Itdoesnotcoverthecorrosionprotectionofthesectionsofthestructureabovethesealevel,i.e.thesplashzoneandatmosphericzone.Thisstandarddoesnotincludetheinternalprotectionofanycomponentssuchasjacketmembers,legs,conductorpipes;theprotectionoftheseisoftenperformedusingchemicals.2MaterialsThisEuropeanStandardcoversthecathodicprotectionofbareorcoatedsteelswithaspecifiedminimumyieldstrength(S.M.Y.S.)notexceeding500N/mm.2.1OverpolarizationandhighstrengthsteelsIfthepotentialofthestructurebecomestoonegativethestructurewillbecomeoverpolarizedandthiscaninduceapenetrationofhydrogenintothesteelwall,resultinginembrittlementofthemetal,andsubsequentlyapossibledetrimentaleffect,includingpropagationofcracks.Asageneralindicationthehigherthetensileproperties,thegreateristheriskofhydrogeninduceddamage.However,materialhardnessandmicrostructurearealsoimportant.Thesephenomenacanoccuronconventionalsteelsusedforoffshorefixedstructures(gradeS355asperEN10025)atpotentialsmorenegativethan-1,10Vvs.Ag/AgCl/seawater.Relevanttestsshouldbeperformedfortheuseofcathodicprotectionoutsidetheselimits.2.2GalvaniccouplingSomepartsofthestructurecanbemadeofmetallicmaterialsotherthancarbonmanganesesteel.Thecathodicprotectionsystemshouldbedesignedtoensurethatthereiscompletecontroloveranygalvaniccorrosionarisingfromthiscoupling.3EnvironmentThisEuropeanStandardisapplicableforthewholesubmergedzoneinanykindofseawaterorseabed.Forsurfaceswhicharealternatelyimmersedandexposedtotheatmosphere,thecathodicprotectionisonlyeffectivewhentheimmersiontimeissufficientlylongforthesteeltobecomepolarized.Thisisthecaseonaboutthelowestthirdpartofthetidalzone.Adifferentmethodofcorrosionprotectionshallbethereforeusedfortheprotectionofthewettedsurfacelocatedabovethislevel,i.e.byusingaprotectivecoating,cladding,sheathingorincreasingthethicknessofthestructuralmaterial.
【中国标准分类号】:A29
【国际标准分类号】:47_020_05;77_060
【页数】:36P;A4
【正文语种】:英语