A reassessment is made of the condition of a major gas transmission pipeline known to be affected by stray D.C. traction currents. The testing procedure used to evaluate the corrosion mitigation program is reviewed. Available voltage recording instrumentation is reviewed with a selection of data loggers and software to best suit the field application. Changes are introduced to existing cathodic protection systems to enable effects of cathodic protection and stray traction current to be recognized independently. Criteria for corrosion control by the effects of cathodic protection and stray traction drainage is reviewed. The use of buried coupons at selected test stations is investigated. Changes in the pipeline configuration relating to corrosion control are introduced during a construction project to upgrade the system operating pressure. An initial field test program is reported with details of problems encountered. Expectations and proposals for ongoing tests to develop future test procedures are discussed.

Subject
Electric current, Test methods, Piping, Voltage, Cathodic protection, Cathodic potential, Pipe to soil potential, Pipelines, Instrumentation, Traction, Rectifiers, Stray current, Corrosion protection
Keywords:
stray traction current, Beta curve, voltage recorders, data loggers, corrosion control criteria, buried coupons, shorted casings, pipeline
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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