Case histories in which boiler tube failures resulted from a combination of steam blanketing and underdeposit corrosion are reviewed. Steam blanketing originates from inadequate circulation and commonly occurs in horizontal or sloped boiler tube circuits in the roof of a boiler. It can lead to boiler tube corrosion failures by providing a mechanism for concentration of normally soluble species at or above a liquid/vapor interface.

Subject
Circuits, Corrosion failures, Water, Tubes, Gouging, Water chemistry, Waterline, Phosphates, Scale formation, Boilers, Deposit corrosion, Steam, Types of corrosion
Keywords:
boiler tube, caustic gouging, steam blanketing, circulation, waterside deposits, coordinated pH, phosphate, maricite, iron-sodium-phosphorus complex, water treatment
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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