The current measured on a coupon approximating the size of a coating holiday indicates the induced alternating current (AC) current density on a buried pipeline. Although the thresholds for concern are generally based on specific levels, the actual induced current density from a collocated high voltage alternating current (HVAC) transmission line varies considerably with time. Coupon field data from numerous pipeline sections will be presented and analyzed.

Subject
Electric current, Circuits, CP coupons, Electrochemical cells, Voltage, Metal coupons, Pipelines, Soil resistivity, Grounding, Transmission lines, Current densities, Corrosion coupons, Coupons
Keywords:
HVAC interference, collocated pipelines, AC current density, coating holidays, coupons
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.