A case history of how utility operators in the City of Philadelphia have approached and resolved a major stray current corrosion problem on their respective structures. Stray earth currents, caused by operation of a de powered transit system, and their effect on area utilities are reviewed. Also, the pitfalls of indiscriminate stray current drainage are reviewed along with how maintaining the status quo can, in fact, negate improvements to the source of stray earth currents.

Subject
Steel structures, Underground structures, Substations, Water, Structures, Metallic structures, Cables, Electric potential, Stray current, Driving potential, Corrosion potential, Drainage, Negative return
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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