Two six inch and two ten inch 4.5 km pipeline bundles were internally coated after fabrication using an In Situ technique. The fluids to be carried in the pipelines were potentially corrosive and the coating was selected as the best solution for the project.

This paper presents results obtained from extensive testing of the selected coating under simulated process conditions. The tests showed i.a. that the coating had very good pigging resistance and that no blisters occurred in oil and gas environment when depressurised from 40 bar to atmospheric pressure in 20 minutes. Artificial crevices simulating coating damage did not accelerate corrosion. In the presence of oil and in the presence of oil and an inhibitor corrosion rate in these crevices was reduced. The coating was field test applied under site conditions and further pigging, depressurisation and other tests were successfully carried out. Low ambient temperatures at the construction site necessitated the heating of the entire pipeline.

Brief technical details of the coating of the main pipelines are also given. The coating was found in good condition after two years in service without any apparent deterioration.

Subject
Test methods, Coatings, Pipelines, Coating damage, Crevices, Epoxy coatings, Crude, Dry film thickness, Pigging, Blistering, Paints, Cleaning, Oil
Keywords:
Internal Coating of pipelines, in situ coating technique, testing of coating, corrosion under damaged coating, inhibition under damaged coating
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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