There is an increasing use of CRA's for subsea flowlines. These pipes carry corrosive fluids at high temperatures and pressures, and insulation is usually applied to prevent excessive cooling of the process fluids. The present tests were undertaken to investigate the effect of insulation defects on the susceptibility to localised corrosion of a super duplex stainless steel at different internal temperatures.

Four different commercial coating systems were tested, Neoprene, EPDM, Polyurethane and Polyurethane foam. The results show that pitting occurred at an average temperature of 55°C for neoprene and EPDM, and at lower temperatures for the other two coatings. The reasons for this are discussed, and the implications for service applications.

Subject
Electric current, Water, Coatings, Piping, Insulation, Corrosion rate, Polyurethanes, Crevices, Defects, Polyurethane coatings, Fluids, Crevice corrosion, Coating defects
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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