Corrosion and fouling adversely effect the operation of cooling-water systems by reducing heat-transfer capability, increasing maintenance costs, reducing plant availability and increasing contamination. A number of site installations have been equipped with on-line instrumentation to evaluate variability of scaling and fouling behavior during normal plant operation. However, a major drawback of the field monitors has been their inability to indicate real-time corrosion activity beneath surface deposits; rather, it has been necessary to destructively evaluate test heat exchanger tubes and/or rely upon use of corrosion coupons and probes under non-heat flux conditions. A recent initiative has been the development of a combined corrosion and fouling instrument. This unit is capable of providing a real-time indication of corrosion activity under heat-transfer conditions at the tube-wall surface. An overview of the in-the-field development program with results from recent trials are presented and discussed.

Subject
Corrosion rate, Electrochemical noise, Acid attack, Corrosion activity, Instrumentation, Acidity, Heat, Corrosion inhibitors, Pitting, Deposit corrosion, Cooling water, Linear polarization resistance, Fouling
Keywords:
Fouling, under-deposit corrosion, on-line monitoring, cooling water systems
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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