Induced Alternating Current on buried pipelines is not new, but the corrosive action of this current on the pipeline is not well known or well documented. Little information is available on how to identify the effects of induced A/C and then develop a program to mitigate the current to acceptable levels. There is also little documentation on how to provide a monitoring system to insure the continued mitigation.

This paper is an attempt to inform the pipeline community of the possibility of AC corrosion on select lines. By conducting various field and laboratory tests, the pipeline company has identified A/C corrosion as the reason for a release in Rockwall County Texas. This paper outlines those tests, their results, the mitigation program developed to remedy the problem, and the monitoring program implemented to insure that the integrity of the system is being maintained.

Subject
Electric current, CP coupons, Piping, Electrochemical cells, Cathodic protection, Pipelines, Free corrosion potential, Current densities, Anomalies, Bacteria, Alternating current corrosion, Zinc, Soil
Keywords:
Alternating Current, Anomaly Investigation, MIC, Coupon, A/C corrosion, A/C corrosion rate, Zinc grounding cell
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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