This paper presents the effects of changing physical parameters on the performance of parallel ribbon, sacrificial anode cathodic protection systems for coated pipelines. The mathematical model accounts for the current and potential distributions associated with discrete holidays on coated pipelines that expose bare steel to the environment. Case studies have been selected to show conditions under which a given CP system will and will not protect the pipe. An evaluation of remedial CP system upgrades to enhance the performance of a given system will also be discussed.

Subject
Holidays, Ribbons, Piping, Anode potential, Anodic protection, Cathodic protection, Zinc anodes, Magnesium anodes, Pipelines, Soil resistivity, Surveys, Soil, Corrosion potential
Keywords:
cathodic protection, mathematical model, pipelines, coating holidays, sacrificial anodes
© 1995 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1995
Association for Materials Protection and Performance (AMPP)
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