Concrete pressure pipe (CPP) is used in water and waste water systems that serve virtually every city in North America. Various techniques are used to evaluate the corrosion state of a buried pipeline. The two most commonly used are the pipe-to-soil (P/S) and cell-to-cell potential techniques. However, only a few references exist relating to the use of these monitoring procedures for CPP.

Various corrosion engineering firms have confidence in one or the other technique without being able to provide the rationale for their preference. Both techniques have recently been challenged as being insufficiently reliable for CPP.

This project consisted of setting up simulated corrosion cells on a 48" (1.22 m) diameter prestressed concrete cylinder pipe (PCCP) line and allowing five corrosion engineering firms the opportunity to use their monitoring techniques to locate corroding sites.

This project evaluated existing corrosion monitoring techniques based on measuring electrical potentials on PCCP. It was found that bonded and unbonded prestressed concrete cylinder pipe can be monitored for corrosion depending on the intensity of corrosion and the location of the corrosion site on the pipe circumference.

Subject
Prestressed concrete cylinder pipes, Piping, Anode potential, Electrochemical cells, Moisture, Pipe to soil potential, Pipelines, Consultants, Pipe sections, Electric potential, Surveys, Soil, Anodes
Keywords:
Corrosion monitoring, potential survey, prestressed concrete cylinder pipe, water pipelines, soil moisture contents, test methods
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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