Eleven liquid applied coating systems and three tape wrap systems were evaluated for use as an "in the ditch" renovation coating for the external repair of hot, in-service pipelines which have suffered pitting corrosion under the existing high dielectric wrapped coatings. Two liquid systems were approved. Of prime importance was the requirement that the candidate coatings provide cathodic disbonding resistance and other properties similar to fusion bonded epoxy. The results of the three year study are reviewed. Problems associated with the implementation of the renovation work are discussed.

Subject
Pipe surfaces, Coating application, Water, Piping, Pipelines, Fusion bonded epoxy coating, Coal tar epoxy, Cathodic disbondment, Coal tar, Immersion, Polyethylene, Electrical resistance, Urethane
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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