The use of representative tube specimens in a test loop used in conjunction with analytical data can help determine the endpoint in a chemical cleaning procedure. The iron-chromium spinels formed on the low chromium ferritic alloys used in fabrication of superheater, reheater and main steam lines frequently require long exposure times at temperature to remove.

Since it is necessary to keep the system packed with fluid during the entire cleaning procedure, condensate must be added if leaks develop; additional solvent may be simultaneously needed to keep the available solvent above the minimum level required. The paper describes the use of test rigs at several different generating stations.

Subject
Materials, Valves, Tubes, Chemical cleaning, Tube samples, Solvents, Exfoliation, Oxide scales, Reheaters, Boilers, Steam, Test specimen, Cleaning
© 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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