Cathodic protection surveys are an integral part of maintaining safe pipeline operation. Such surveys are mandated by law in many countries of the world. One of the standard means of testing cathodic protection system operation and pipeline protection levels, is the annual or bi-annual test point survey. These tests normally provide potential data on less than 0.5% of the pipeline. Computerized dataloggers for cathodic protection system monitoring enabled the development of the close interval survey (C.I.S.) into a viable means of assessing the effectiveness of cathodic protection systems along the full length of both coated and bare pipelines. An accurate C.I.S. will provide an in-depth knowledge of the line and the information required to maintain the pipeline integrity. Project planning, cooperation of the client and contractor, a high level of technical expertise, fieldcraft and dedicated equipment are required to benefit from this type of survey. The C.I.S. will generate very large volumes of data, and it is essential that this data be technically correct and its management and reporting efficient.

Subject
Electric current, Pipeline operations, Voltage drops, Piping, Cathodic protection, Pipe to soil potential, Reference electrodes, Pipelines, Coating surveys, Rectifiers, Cathodic protection survey, Surveys, Electrode potential
Keywords:
cathodic protection, close interval potential survey, test station survey, rectifier sphere of influence, potential spiking, current interrupters, stationary datalogger, potential survey graphs
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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