Cooling Tower #5 is a new tower started up in April, 1980. The tower system was built for non-chromate water treatment. The specific phosphate treatment method was chosen after extensive testing. Immediately upon startup corrosion problems that were not indicated in the testing were found. Carbon steel corrosion rates were greater than .175 mmpy and admiralty corrosion rates were above .013 mmpy. Reversion rates of polyphosphate to orthophosphate varied and high fouling rates occurred. Several changes in chemicals and other control parameters have been made. The carbon steel corrosion rates have decreased to less than .013 mmpy. The copper corrosion monitors indicate a corrosion problem but equipment inspections do not verify this problem.

This paper describes the changes to cooling water chemistry made in the first year of operation. Data from coupons, a NACE test heat exchanger and Petrolite PAIR probes are presented to show what each change did for admiralty and carbon steel corrosion inhibition. Visual inspection reports are detailed to provide information on fouling rates caused by these changes.

Subject
Water, Corrosion rate, Tubes, Orthophosphate, Steel coupons, Dispersants, Heat exchangers, Heat, Corrosion inhibitors, Towers, Pitting, Carbon steel, Copper
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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