A variety of cathodic Protection retrofit systems are available today for above ground storagetanks. The presence of secondary containment liners, refrigeration systems, and an Arctic environment necessitates the use of a CP system in which the anodes are located in close proximity to the tank bottom. This paper presents operating experiences with several impressed current CP systems that were installed on existing large diameter tanks along the Pipeline. Impressed current CP retrofit systems that were evaluated include an abandoned tank bottom as the anode, a tank perimeter conductive polymer anode loop, and horizontally installed distributive anode systems beneath the tanks.

Subject
Electrochemical cells, Tubes, Pipelines, Inspection, Impressed current anodes, Polymers, Rectifiers, Electric potential, Secondary containment, Tank bottoms, Instant off potential, Corrosion potential, Anodes
Keywords:
Perma Frost, Thaw Bulb, Impressed Current, Reference Cell, Thermite Weld
© 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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