Over the last three years, a new system for measuring the cathodic protection potential of subsea pipelines has been developed. The equipment consists of a dual silver/silver chloride electrode probe, mounted on a remote controlled submarine, a silver/silver chloride reference electrode which is maintained at a distance from the pipeline and support ship, and a monitor console. As the submarine moves along, over the pipe, the monitor console records the cathodic protection potential profile and radial field gradient on a continuous chart recorder and also on a strip printer. At intervals, contacts with anode bracelets or bare pipe are used to calibrate the system. A complete potential profile is obtained, together with measurements of current density on damaged areas, and anode output currents.

Typical results obtained from a number of North Sea pipelines are discussed.

Subject
Piping, Cathodic protection, Probes, Reference electrodes, Pipelines, Charts, Cables, Bracelet anodes, Marine vessels, Chlorides, Protection potential, Electrodes, Electrode potential
© 1981 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).
1981
Association for Materials Protection and Performance (AMPP)
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