Significant AC interference was discovered on a new tape coated steel water transmission main which was tied into a concrete coated steel water transmission system. The AC interference was evidenced by shock incidents during construction, and failure of dielectric isolation flanges within one year after construction. The Safety concerns and Cathodic protection system failures led to an investigation to determine the causes of the interference. Interim safety procedures were developed to minimize the safety hazard. The goal of the investigation is to define and implement mitigation measures which will maintain electrical isolation and cathodic protection of the pipeline and reduce the AC interference to acceptable levels.

Subject
Electric current, Circuits, Piping, Voltage, Cathodic protection, Pipe to soil potential, Isolation, Pipelines, Flanges, Grounding, Personnel, AC interference, Soil
Keywords:
AC Interference, induced AC, stray current, pipeline impedance, cathodic protection, electrical hazard mitigation, AC resistance, pipeline resistance calibration
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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