When cathodically protecting a structure with sacrificial anodes, the required anode weight will decrease if the structure additionally is coated. For a lot of structures, reduction in weight is an important factor. It is important to reduce the lift weight for installation purposes and for design purposes it is important to reduce drag forces.

Coating in combination with cathodic protection doesn't mean that the structure has to be 100% coated. By coating 90% of the surface areas, the anode weight may be reduced dramatically. This means that welding zones and damage to coating systems during fabrication the phase don't need to be repaired as long as this is included as bare area in the CP design.

This paper presents different methods for design of CP with and without coating and comparing the results to show weight savings.

Subject
Steel structures, Coatings, Piping, Anodic protection, Cathodic protection, Welding, Structures, Anode surfaces, Surfaces, Coating breakdown, Jackets, Paints, Anodes
Keywords:
cathodic protection, coating, sacrificial anodes, weight savings, uncoated
© 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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