This paper discusses the effects of coupon size, geometry, distance between the potential sensing area and the coupon, material selection for the coupon, installation of the probes with coupons, and potential measurement interpretation on pipelines and coupons. Test results measured on a probe with a flat coupon and narrow sensing strips and a comparison of coupon potentials after potential decay and corrosion potentials is also presented.

Subject
CP coupons, Cathodic protection, Probes, Tubes, Steel coupons, Reference electrodes, Pipelines, Potential measurements, Corrosion coupons, Polarization, Soil, Corrosion potential, Electrode potential
Keywords:
coupons, cathodic protection probes, protection criteria, soil voltage drop, “on” potentials, “off” potential, potential decay
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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