ISO INTERNATIONAL STANDARD 15589-1 Second edition 2015-03-01 Petroleum, petrochemical and natural gas industries - Cathodic protection of pipeline systems - Part 1: On-land pipelines Industries du pétrole, de la pétrochimie et du gaz naturel - Protection cathodique des systemes de transport par conduites - Partie 1: Conduites terrestres Reference number ISO 15589-1:2015(E) ISO International Organization for Standardization eZhejang Insttute of Standardization 5956617 @IS02015 HS unde mitted without license from IHS IS0 15589-1:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland DrganizationforStandardization Not for Resale, 2015/6/2 07:03:00 networking permited withoutlicense from IHS IS0 15589-1:2015(E) Contents Page Foreword ..vi Introduction. ..vii 1 Scope. 2 Normative references .... 3 Terms and definitions 4 Symbols and abbreviations 4.1 Symbols. .5 4.2 Abbreviations .7 5 CP personnel competence. .7 6 Cathodic protection criteria .8 6.1 General. .8 6.2 Protection potentials 6.3 Alternative methods. .10 6.3.1 100 mV cathodic potential shift ..10 6.3.2 Other methods .10 6.4 Criteria in the presence of a.c. 10 Pre-requisites for the application of cathodic protection .10 7.1 General .10 7.2 Electrical continuity .10 7.3 Electrical isolation. ..11 7.3.1 General. .11 7.3.2 Locations. .11 7.3.3 Isolating joints .11 7.3.4 Internal corrosion risks at isolating joints ..12 7.3.5 Contacts between metallic structures .13 7.3.6 Electrical earthing system.. 7.4 Lightning and overvoltage protection. ..14 7.5 Coating .15 7.5.1 General. .15 7.5.2 Factory-applied coatings. ..15 7.5.3 Field joint coatings. ..15 7.5.4 Coating for trenchless pipelines. ..15 7.5.5 Air to electrolyte interface. 7.5.6 Compatibility of coatings and wraps with cathodic protection .16 7.5.7 Thermal insulation.. ..16 7.5.8 Reinforced concrete weight coating .17 7.6 Selection of pipe trench backfill material. 7.7 Buried casings for pipelines. .17 7.7.1 General. ..17 7.7.2 Casings that shield cathodic protection current ..17 7.7.3 Casings that pass cathodic protection current. ..18 7.8 Equipment for the reduction of a.c. interference. ..18 7.9 Equipment for the mitigation of d.c. interference 18 emaonalganzatin5All rights reserved ii icensee=Zhejiang Institute of Standardization 5956617 without license from IHS Not for Resale, 2015/6/2 07:03:00 IS0 15589-1:2015(E) 8 Basic reguirements for cathodic protection design 18 8.1 General. 18 8.2 Basic information for cathodic protection design. 19 8.3 Contents of cathodic protection design report 20 8.4 Cathodic protection current demand. 20 8.4.1 Calculation of the theoretical total current demand. 20 8.4.2 Currentdemandbasedoncoatingbreakdownfactors 21 8.4.3 Currentdemandbasedoncurrentdensityvaluesforcoatedpipelines .22 8.5 Cathodic protection equipment. 23 8.5.1 Cathodic protection cables. 23 8.5.2 Cable connection.. 24 8.5.3 Precautions to respect for distribution boxes and test stations. 25 8.6 Temporary protection. .26 8.7 Specific case of existing pipelines 26 8.7.1 General. 26 8.7.2 Parallel pipelines 27 8.7.3 Parallelism or crossing with a.c. power systems. .27 8.8 Trenchless installation methods. 27 9 Impressed current stations .28 9.1 General. 28 9.2 Power supply 28 9.3 Groundbeds 29 9.3.1 General. 29 9.3.2 Deep-well groundbeds. 29 9.3.3 Shallow groundbeds 30 9.3.4 Impressed-current anodes and conductive backfill 31 9.4 Output control .32 9.4.1 General 32 9.4.2 Current di