The discovery of intergranular attack on a Mil. Spec. zinc bracelet anode on a hot (99°C) subsea line at the Ekofisk field in the North Sea in 1977 prompted Phillips Petroleum Company to undertake a sacrificial anode testing program. The site chosen was Phillips Petroleum Company Norway’s operations base on the North Sea coast at Tananger where there was good access to realistic conditions for a long-term field test. The purpose of the first stage of testing was to attempt to duplicate the intergranular attack on U.S. Mil. Spec. 18001 H zinc and in addition to evaluate the performance of other commercially available anode alloys under the conditions prevailing on hot buried subsea pipelines.

The first 18 month anode test commenced in April 1979. A description of the test facility and review of the first 12 months results is followed by a discussion and comparison of the results with other laboratory and field test work carried out in the last three years.

Subject
Test methods, Anode potential, Zinc anodes, Drilling fluid, Anode surfaces, Impressed current anodes, Corrosion attacks, Anodic current, Zinc, Aluminum alloys, Half cell potential, Half cells, Anodes
© 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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