In a two year research programme the corrosion behaviour of two commercial stainless steels, duplex and austenitic, was investigated for hot riser application. The stainless steels were exposed in the tidal/splash, submerged and buried zones and the temperature of the production stream was varied between ambient seawater temperature and 90 °C. Generally, the corrosion potentials became more negative as the surface temperature of the steel increased. This was due to reduced solubility of oxygen in the laminar layer near the steel surface, and chemical precipitation of calcareous deposits on the steel surface at production stream temperatures higher than 50 to 60 °C. No localized corrosion attacks were observed in the tidal/splash and buried zones. In the submerged zone, no attacks was observed on the austenitic steel. Corrosion attacks were observed in artificially introduced crevices on the duplex steel in the submerged zone.

Subject
Risers, Environmental zones, Steel surfaces, Materials, Cathodic protection, Seawater, Crevices, Steel, Localized corrosion, Stainless steel, Protection potential, Corrosion potential, Submerged zone
© 1985 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).
1985
Association for Materials Protection and Performance (AMPP)
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