Corrosion Under Insulation (CUI) is a serious threat that is unavoidable during long term plant operation, and coatings are the most effective measure for preventing CUI. Three types of coatings (i.e., heat resistant epoxy coating, new technology liquid coating (Note), and thermal sprayed aluminum coating) are typical candidates for preventing CUI. However, neither a set of guidelines for selection of the best coating system nor a standardized test method for CUI has been established. In order to establish such a set of guidelines and standardized test method, much more information is needed.

This paper evaluates the resistances to CUI of three types of coatings under severe CUI conditions using a vertical pipe test method1 . Certain possible improvements in the test method are also discussed.

Note: “Inorganic copolymer or coatings with an inert multipolymeric matrix” specified as coating systems CS-6 and SS-5 in NACE(1) SP01982 

Subject
Test methods, Water, Coatings, Materials, Piping, Aluminum spraying, Wool, Epoxy coatings, Sodium chloride solution, Heat, Corrosion under insulation, Thermal insulation, Samples
Keywords:
corrosion under insulation, CUI, heat resistant epoxy, inorganic copolymer or coatings with an inert multipolymeric matrix, thermal sprayed aluminum, TSA, vertical pipe test, aluminum grade 1100, blackening
© 2017 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).
2017
Association for Materials Protection and Performance (AMPP)
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