Traditionally, close interval potential surveys (CIPS) and direct current voltage gradient surveys (DCVG) have been undertaken separately and the corrosion engineer has been saddled with the task of trying to correlate the results of these surveys, to assess the level of cathodic protection on the pipeline and the effect of coating holidays on the effectiveness of the cathodic protection system. This paper outlines a method of undertaking both surveys simultaneously and the benefit to the corrosion engineer of having accurate and correlated surveys. The paper also deals with surveying pipelines affected by stray currents.

Subject
Holidays, Voltage, Cathodic protection, Pipe to soil potential, Pipelines, Close interval potential surveys, Coating surveys, Rectifiers, Stray current, Cathodic protection survey, Coating defects, Surveys, Electrodes
Keywords:
close interval surveys, CIS, close interval potential surveys, CIPS, direct current voltage gradient, DCVG, stray current correction, telluric current correction, coating holidays, coating defects
© 2008 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).
2008
Association for Materials Protection and Performance (AMPP)
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