The corrosion related premature failure of ductile iron water main piping is a significant problem for many Canadian cities. The first failures in the City of Scarborough, occurred after the pipe had only been in service for 7 years and the rate of failure continued to increase until a cathodic protection program was implemented.

This paper describes the preventative maintenance program designed by the Scarborough Public Utilities Commission to combat the problem of ductile iron water main failures. This program includes soil sampling, pre and post installation surveys, the installation of cathodic protection utilizing sacrificial anodes and record keeping. The issue of standards for new installations is also addressed.

Subject
Corrosion failures, Water, Piping, Cathodic protection, Zinc anodes, Magnesium anodes, Soil resistivity, Installation, Inventory, Anode resistance, Ductile iron, Soil, Anodes
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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