Joint use of rights-of-way by pipeline and electric transmission companies is increasing as a result of increased demand for energy and decreased land availability. Larger diameter pipelines are the rule, protected by improved coatings having high dielectric strength that electrically insulate the line from the earth. Power companies are called upon to supply constantly increasing amounts of electricity with the results that transmission systems operate near maximum loads for a large part of the time. The combination of a well-insulated pipeline in close proximity and parallel to a highly loaded AC transmission system can result in substantial induced voltages on the pipeline. When potential differences between the pipeline and earth exist, electric charges can flow creating a possible safety hazard to personnel contacting the line and raising questions concerning the effect of AC on pipeline corrosion, coatings, and cathodic protection.

Subject
Electric current, Thin films, Water, Piping, Voltage, Cathodic protection, Pipelines, Bottles, Rods, Sodium chloride solution, Weight loss, Steel, Alternating current corrosion
© 1976 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).
1976
Association for Materials Protection and Performance (AMPP)
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