Corporations spend millions of dollars annually performing close interval potential surveys (CIS) on pipeline systems. Without research or knowledge of all influencing impressed current cathodic protection sources prior to conducting the surveys, much of the data collected may be inaccurate, incomplete and invalid.

This paper does not introduce new concepts in influence testing, but instead introduces new survey techniques that improve our ability as corrosion control professionals to evaluate influence from impressed current cathodic protection sources when planning surveys.

The information collected during the influence study is used to develop an optimal interruption plan prior to conducting a CIS. These tools improve data quality, speed up the survey process and reduce costs. In addition, data obtained from these studies provides many benefits which are useful for data interpretation during routine annual surveys.

Subject
Electric current, Test methods, Voltage drops, Materials performance, Pipe to soil potential, Cathodic current, Pipelines, Close interval potential surveys, Rectifiers, Electric potential, Cathodic protection survey, Corrosion protection, Surveys
Keywords:
Close Interval Potential Survey, CIS, Interference, Influence, Waveform
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
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