During the past several years, there has been a growth in the use of solubilizing, sub-stoichiometric boiler deposit inhibitor programs. The popularity of this type of program is due in large part to: low suspended solids tolerance in modern high heat transfer steam generating equipment; high levels of metallic corrosion products in boiler water and boiler deposits; and the growing reliance on external treatment equipment to provide consistently high quality boiler feedwater.

Comparisons were made in the laboratory between precipitating programs, residual chelant programs and various combinations of sub-stoichiometric antiscalants. Results indicate that iron deposit control can be enhanced through the use of sub-stoichiometric treatment. Also, hardness control, beyond that afforded by phosphate, and comparable to a tightly-controlled residual chelant program, can be achieved. It was also found that the inclusion of sequestering agents in the treatment allows for optimum performance. Results of field studies bear out the laboratory findings.

Subject
Corrosion prevention, Antiscalants, Water, Iron, Solubility, Polymers, Feedwater, Metals, Heat, Scale, Boilers, Deposit corrosion, Hardness
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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