Despite using demineralized feedwater, water related tube failures still occur in some industrial boilers. The failures occur due to overheating or corrosion. The corrosion may be either caustic or acidic attack. These tube failures can be avoided by employing water treatment programs that minimize deposition and maintain boiler water chemistry that does not become aggressive to the boiler steel when it is concentrated. The best boiler water chemistry to maintain, congruent phosphate-pH treatment, equilibrium phosphate treatment or phosphate treatment, depends on individual system operating conditions. Experience indicates that boiler deposition and boiler water chemistry control are the most significant factors affecting boiler tube failures.

Subject
Acids, Corrosion failures, Water, Tubes, Water chemistry, Contaminants, Feedwater, Phosphates, Metals, Overheating, Boilers, Deposit corrosion, Steam
Keywords:
tube failures, overheating, corrosion, phosphate polymer, congruent phosphate treatment, equilibrium phosphate treatment, phosphate treatment, automatic feed and control
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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