During the 90’s the floating production systems have been more and more common on the different oil fields worldwide. FPSOs are new built “tankers” or modified existing “tankers”. Cathodic protection of an FPSO is in most cases based on IC and designed according to “ship standards”. One significant operational difference between a ship and an FPSO is that a ship is in dock each 3 to 5 years for repair of coating etc. An FPSO is in operation for typically 15 to 30 years, with no coating repair. This will result in a major increase in the current requirements from launch to the end of operational life. The number of IC anodes is in most cases too few and the size of shielding around anodes is too small. CP modeling has shown that this may result in both significant over protection and at the same time under protection. CP modeling has shown to be an excellent tool for optimizing anode number, positions and shielding size.

Subject
Galvanic anodes, Anode potential, Modeling, Negative potentials, Hull, Current densities, Shielding, Color, Coating breakdown, Electric potential, Floating production storage and offloading units, Corrosion protection, Anodes
Keywords:
Impressed Current, IC, Computer modeling, cathodic protection, CP, FPSO, overprotection
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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