Pipeline Cathodic Protection (CP) projects are traditionally implemented to provide hot spot protection where needed based on CP monitoring data and to comply with regulatory criteria. In today's competitive environment, operating company management additionally demands that proposed CP projects be justified economically. In-line corrosion inspection (corrosion pig) data can be used to predict potential future corrosion maintenance that would occur under alternative scenarios, both with and without additional CP. An economic analysis can then be used to determine if expected benefits of proposed CP projects outweigh costs. This paper describes methods used on the Trans Alaska Pipeline System (TAPS) for predicting future corrosion maintenance using in-line inspection data, in addition to CP monitoring data, and evaluating the economic impact of proposed CP projects. An example is presented to illustrate the method used.

Subject
Costs, Piping, Cathodic protection, Corrosion rate, Inline inspection, Pipelines, Inspection, Installation, Corrosion growth, Defects, Corrosion data, Maintenance, Anodes
Keywords:
Corrosion pigs, in-line inspection, cathodic protection, corrosion maintenance, maintenance management, corrosion prediction, economic analysis, regulatory compliance
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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