ISO INTERNATIONAL 24656 STANDARD Firstedition 2022-05 Cathodicprotectionofoffshorewind structures Protectioncathodiquedesstructureseoliennesenmer Referencenumber IS024656:2022(E) ISO @ISO2022 IS024656:2022(E) COPYRIGHTPROTECTEDDOCUMENT ISO2022 All rights reserved.Unless otherwise specified, orrequired in the context of its implementation,no partof this publication may bereproduced orutilizedotherwisein anyformorbyanymeans,electronicormechanical, includingphotocopying,orpostingon orIso'smemberbody inthecountryoftherequester. ISO copyrightoffice CP401.Ch.deBlandonnet8 CH-1214Vernier,Geneva Phone:+4122749 0111 Email:[email protected] Website:www.iso.org Published in Switzerland ii IS02022-Allrightsreserved IS024656:2022(E) Contents Page Foreword vi Introduction ..vii 1 Scope. 2 Normativereferences .1 3 Terms and definitions. .1 4 .5 Symbolsandabbreviations 4.1 .5 Symbols, .7 4.2 Abbreviations 5 Competence of personnel 8 6 Structural considerations .9 6.1 Structuresto beprotected 9 6.2 Materials 10 6.3 Corrosion protection strategy 10 7 Cathodic protection criteria .15 7.1 Temporaryprotection. 15 7.2 Steel structures. 16 7.3 Reinforcedconcretestructures 17 Cathodic protection design 17 8 8.1 Objectives 17 8.2 Design considerations. 18 8.2.1 General 18 8.2.2 Externalcathodicprotection 19 8.2.3 Internalcathodicprotection 19 8.3 CPDesign life 20 8.4 Surfacearea considerations 20 8.4.1 20 General 8.4.2 Structure subdivision 20 8.5 Environmentalfactors. 21 8.5.1 General. 21 8.5.2 21 Seawaterflowvelocity 8.5.3 Electrolyteresistivity 22 8.5.4 Seawatertemperature 22 Calcareous deposits 22 8.5.5 23 8.6 Protectioncurrentdemand 23 8.6.1 General 8.6.2 Calculation of current demand, external surfaces 23 8.6.3 Calculation ofcurrentdemand, internal surfaces 26 8.7 Electrical continuityand continuitybonds 26 8.8 27 Currentdrainsandinteractions 8.9 Installation considerationsduringdesign 27 Galvanicanodesystems .28 9 9.1 General.. 28 9.2 Anodecurrentavailability 28 9.3 Galvanicanodealloys 28 9.4 Anodeselection. 29 9.5 Anoderequirements. 30 9.6 Anodedistribution. 31 10 Impressed current systems 32 10.1 .32 General. .33 10.2 Design considerations iii IS02022-All rights reserved