Frequent gas leakage due to external corrosion has been observed on an underground protected gas pipeline within one & half years after commissioning. Both on-site examination & failure analysis at laboratory have been carried out. Present study depicts technical details of transient/steady state stray current sources, AC switching & lightning surges, distorted anodic gradient and foreign anode bed proximity effects.

Subject
Substations, Petroleum products, Materials, Voltage, Cathodic protection, Leaks, Gas pipelines, Pipelines, Coating surveys, Corrosion protection interference, Surveys, Protection potential, Anodes
Keywords:
metallography, tafel plot, energy dispersive spectroscopy, insufficient polarisation, anodic gradient, anode bed proximity, AC surges, electroendosmosis, polarisation cell
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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