Potential measurements have long been used for analyzing corrosion patterns and problems on underground pipelines(1) and on lead-sheathed cables.(2) (3) These measurements, referred to as pipe-to-soil potential and cable-to-soil potential, are measurements of the electrical potentials which exist between the pipe or cable and a reference electrode placed in the soil at intervals along those structures. In using these measurements for the determination of corrosion patterns, potential profiles are drawn in which the potential measurements are plotted against distance along the structure being considered. A typical profile taken with the reference electrode placed at 50 foot intervals, is shown in Figure 1. As shown in that figure, potential profiles are plotted using measurements taken with the reference electrode placed directly over the structure as well as some distance laterally away from that structure.

Subject
Cathodic protection, Pipe to soil potential, Pipelines, Wiring, Potential measurements, Corrosion products, Cables, Negative potentials, Steel pipes, Electric potential, Stray current, Copper, 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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