Leakage conductance is one of the most important parameters in surveying a coated pipeline system as to the soundness of the coating and current requirement for cathodic protection. The leakage conductance survey usually employs, as recommended in the Technical Committee Report of NACE1 , the measurements of potential change when the current source is switched on and off. Readings are taken of a pipeline to remote copper sulfate electrode. A reading of "on" potential thus taken includes both polarization and IR drop. On switching off the current source, IR drop disappears instantaneously while polarization decays gradually, Hence the potential change observed on current interruption would hopefully consists only of IR drop.

Subject
Holidays, Electric current, Voltage drops, Reference electrodes, Leaks, Pipelines, Mortar, Seawater, Electrical resistivity, Steel, Weight coatings, Corrosion potential, Electrode potential
© 1978 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).
1978
Association for Materials Protection and Performance (AMPP)
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