【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


【英文标准名称】:Chemicalsusedfortreatmentofwaterintendedforhumanconsumption-Sodiumdisulfite;GermanversionEN12121:2005
【原文标准名称】:人类生活用水处理用化学品.二硫化钠
【标准号】:EN12121-2005
【标准状态】:现行
【国别】:
【发布日期】:2005-09
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:规范(验收);化学性质;硫酸钠;特性;物理性能;储存;极限(数学);水处理;交货形式;纯度;处理;试验;饮用水;水常规(实验);作标记;亚硫酸钠;危险的可裂变物质;额定值;抽样方法;饮用水处理;给水
【英文主题词】:Chemicalproperties;Dangerousstuffs;Drinkingwatertreatment;Formofdelivery;Limits(mathematics);Marking;Physicalproperties;Potablewater;Properties;Purity;Ratings;Samplingmethods;Sodiumdisulfite;Sodiumsulphites;Specification(approval);Storage;Testing;Treatment;Waterpractice;Watersupply;Watertreatment
【摘要】:
【中国标准分类号】:G77
【国际标准分类号】:71_100_80
【页数】:20P.;A4
【正文语种】:英语