On the Norwegian Continental Shelf exploration has started in the area of the shelf between 63 and 67°N for water depths down to 1500m. A field-testing programme has been performed at depths from 100m down to 1300m, which covered exposures at the blocks Helland Hansen, Møre West, Ormen Lange, Vema/Nyk and Gjallar. Testing has been done to establish the CP current demand for C-steel, thermally sprayed aluminium, stainless steel (6 Mo) and titanium (grade 5). The initial current demand in the zone from 100m down to 200m was found to be especially high (> 0.22 A/m2). While at depths from 600m and down to 1300m depth an initial design current density of 0.22 A/m2 resulted in a polarisation to the protective potential on C-steel within a two-month period.

Subject
Cathodes, Electric current, Test methods, Water depth, Cathodic protection, Diffusion, Seawater, Current densities, Electric potential, Oxygen, Titanium, Stainless steel, Protection potential
Keywords:
Cathodic protection, deep water, field-testing
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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