Historically, high nitrite treatment programs provided excellent corrosion control in closed loop cooling water systems. Monitoring and controlling these programs involved the use of off-line reagent tests and feedforward control loops.

Environmental concerns led to the creation of a low nitrite treatment program which can be used in both open recirculating and closed cooling water systems. Many treatment users now require that the water treatment supplier assume responsibility for administering and controlling the chemical treatment program. These points necessitated the updating of control strategies while maintaining the low corrosion rates observed at higher treatment levels. This paper discusses the problems with uncontrolled high nitrite treatment programs and the solutions of using an automated, controlled low nitrite chemical treatment program. The paper also discusses a relevant case history of a steel making system using process cooling water.

Subject
Sensors, Sodium nitrite, Nitrites, Corrosion rate, Deviation, Automation, Rectifiers, Cooling water systems, Corrosion inhibitors, Steel, Cooling water, Chemical treatment, Water treatment facilities
Keywords:
feedback control, feedforward control, PLC (programmable logical controller), analyzer, on-line sensor, chemometrics, data management software, nitrite, cooling water
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.