BS en 12495-2000 Cathodic Protection for Fixed Steel Offshore Structures

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Text of BS en 12495-2000 Cathodic Protection for Fixed Steel Offshore Structures

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISH STANDARD BS EN12495:2000The European Standard EN 12495:2000 has the status of aBritish StandardICS 47.020.01; 77.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWCathodic protectionfor fixed steeloffshore structuresThis British Standard, havingbeen prepared under thedirection of the ElectrotechnicalSector Committee, was publishedunder the authority of theStandards Committee and comesinto effect on 15 May 2000 BSI 05-2000ISBN 0 580 34821 0BS EN 12495:2000Amendments issued since publicationAmd. No. Date CommentsNational forewordThis British Standard is the official English language version of EN 12495:2000.Reference should also be made to BS 7361, Code of practice for land and marineapplications, which will eventually be withdrawn when all the CEN standardsrelating to cathodic protection currently being prepared, are published.The UK participation in its preparation was entrusted to Technical CommitteeGEL/603, Cathodic protection, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on theinterpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgatethem in the UK.A list of organizations represented on this committee can be obtained on request toits secretary.Cross-referencesThe British Standards which implement international or European publicationsreferred to in this document may be found in the BSI Standards Catalogue under thesection entitled International Standards Correspondence Index, or by using theFind facility of the BSI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunityfrom legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page,pages 2 to 32, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the documentwas last issued.EUROPEAN STANDARDNORME EUROPENNEEUROPlSCHE NORMEN 12495January 2000lCS 47.020.01; 77.060English versionCathodic protection for fixed steel offshore structuresProtection cathodique des structures en acier fixes en mer Katodischer Korrosionsschutz von ortsfesten Offshore-Anlagen aus StahlThis European Standard was approved by CEN on 3 December 1999.CEN members are bound to comply with the CEN/CENELEC lnternal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,lceland, lreland, ltaly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.(8523($1 &200,77(( )25 67$1'$5',=$7,21&20, 7e (8523e(1 '( 1250$/, 6$7, 21(8523b, 6&+(6 .20, 7(( )h5 125081*CentraI Secretariat: rue de Stassart, 36 B-1050 BrusseIs 2000 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members. Ref. No. EN 12495:2000 EPage 2EN 12495:2000 BSl 05-2000ContentsPageForeword...................................................................................................................................................... 4Introduction ................................................................................................................................................. 51 Scope...................................................................................................................................... 51.1 StructuraI parts...................................................................................................................... 51.2 MateriaIs................................................................................................................................. 51.3 Environment........................................................................................................................... 62 Normative references............................................................................................................ 63 Terms and definitions........................................................................................................... 64 Design basis .......................................................................................................................... 84.1 Objectives .............................................................................................................................. 84.2 Cathodic protection criteria ................................................................................................. 94.3 EIectricaI current demand .................................................................................................... 94.4 Coatings ............................................................................................................................... 104.5 Cathodic protection systems - Anode dimensions ......................................................... 115 Design of gaIvanic anodes system.................................................................................... 115.1 GeneraI ................................................................................................................................. 115.2 Design considerations........................................................................................................ 125.3 GaIvanic anode materiaIs................................................................................................... 125.4 Location of anodes.............................................................................................................. 135.5 Anodes' inserts and attachments design ......................................................................... 146 Design of impressed current system................................................................................ 156.1 GeneraI ................................................................................................................................. 156.2 Design considerations........................................................................................................ 156.3 Equipment considerations ................................................................................................. 166.4 Location considerations..................................................................................................... 177 Design of monitoring systems........................................................................................... 177.1 Objectives ............................................................................................................................ 187.2 Description........................................................................................................................... 18Page 3EN 12495:2000 BSl 05-20007.3 PotentiaI measurements .................................................................................................... 197.4 Measurement of the anode eIectricaI current output ...................................................... 197.5 Transmission of data.......................................................................................................... 207.6 ControI and monitoring of impressed current generators ............................................. 208 InstaIIation of cathodic protection and monitoring systems ......................................... 209 Commissioning and surveying of cathodic protection systems................................... 209.1 Objectives............................................................................................................................ 209.2 GaIvanic anode system...................................................................................................... 219.3 Impressed current system................................................................................................. 2110 Documentation.................................................................................................................... 2110.1 GeneraI................................................................................................................................. 2110.2 GaIvanic anodes system.................................................................................................... 2110.3 Impressed current system................................................................................................. 2211 Safety and cathodic protection ......................................................................................... 2211.1 Objectives............................................................................................................................ 2211.2 PhysicaI obstructions......................................................................................................... 2311.3 EIectric shock...................................................................................................................... 2311.4 Gas evoIutio

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