An investigation was conducted on the performance of two different cathodic protection systems designs utilizing zinc ribbon anodes that can be used for corrosion control for above aboveground storage tanks with double bottoms. A full scale field test on a 35 meter (115 feet) diameter tank was conducted to determine cathodic protection system performance. The test included periodic measurement of tank bottom steel potentials including on, instant off and polarization decay, anode current output with associated current densities and tank product level measurements. Results showed that zinc ribbon anode spacing in a chord fashion of 1.2 meter (4 feet) or less can be effective to achieve cathodic protection according to industry accepted standards.

Subject
Depolarization, Test methods, Voltage drops, Cathodic protection, Sand, Zinc anodes, Sulfates, Reference electrodes, Zinc ribbon, Tank bottoms, Zinc, Electrode potential, Anodes
Keywords:
aboveground storage tank, cathodic protection, zinc ribbon anodes, corrosion control, tank bottom underside, double tank bottom
© 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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