1、ICS 23.040.99; 77.060Kathodischer Korrosionsschutz fr unterseeische RohrleitungenEuropean Standard EN 12474 : 2001 has the status of a DIN Standard.A comma is used as the decimal marker.National forewordThis standard has been prepared by CEN/TC 219 Cathodic protection (Secretariat: United Kingdom).T
2、he responsible German body involved in its preparation was the Normenstelle Schiffs- und Meerestechnik(Shipbuilding and Marine Technology Standards Committee).Sacrificial magnesium alloy anodes do not afford adequate cathodic protection to ships and marinestructures since the driving voltage, the el
3、ectrical conductivity of seawater and the fairly high evolution ofhydrogen will badly damage any coatings. Magnesium is highly susceptible to self-corrosion, the rate ofwhich increases in direct proportion to the salt content of the water. The evolution of hydrogen may give riseto hydrogen embrittle
4、ment, especially in cases where high-strength steel is involved in shipbuilding andsubmarine pipeline construction.Ref. No. DIN EN 12474 : 2001-12English price group 12 Sales No. 111203.02DEUTSCHE NORM December 2001EN 12474Continued overleaf.EN comprises 24 pages. No part of this standard may be rep
5、roduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Cathodic protection of submarine pipelinesEnglish version of DIN EN 12474English versionICS 23.040.99; 77
6、.060Descriptors:Cathodic protection of submarine pipelines 2001. CEN All rights of exploitation in any form and by any meansreserved worldwide for CEN national members.Ref. No. EN 12474 : 2001 EKathodischer Korrosionsschutzfr unterseeische RohrleitungenThis European Standard was approved by CEN on 2
7、001-03-07.CEN members are bound to comply with the CEN/CENELEC Internal Regulationswhich stipulate the conditions for giving this European Standard the status of anational standard without any alteration.Up-to-date lists and bibliographical references concerning such national stand-ards may be obtai
8、ned on application to the Management Centre or to anyCEN member.The European Standards exist in three official versions (English, French, German).A version in any other language made by translation under the responsibility of aCEN member into its own language and notified to the Management Centre ha
9、sthe same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, the CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland,and the United Kingdom.EN 12474
10、April 2001Management Centre: rue de Stassart 36, B-1050 BrusselsEuropean Committee for StandardizationComit Europen de NormalisationEuropisches Komitee fr Normung|Protection cathodique descanalisations sous marinesPage 2EN 12474 : 20012333347910111213151617182021232424Page 3EN 12474 : 2001Page 4EN 1
11、2474 : 2001Page 5EN 12474 : 2001Page 6EN 12474 : 2001Page 7EN 12474 : 2001Page 8EN 12474 : 2001Page 9EN 12474 : 2001Page 10EN 12474 : 2001Page 11EN 12474 : 2001Page 12EN 12474 : 2001Page 13EN 12474 : 2001Page 14EN 12474 : 2001Page 15EN 12474 : 2001Page 16EN 12474 : 2001Page 17EN 12474 : 2001Page 18EN 12474 : 2001Page 19EN 12474 : 2001Page 20EN 12474 : 2001Page 21EN 12474 : 2001Page 22EN 12474 : 2001Page 23EN 12474 : 2001Page 24EN 12474 : 2001
