This paper is a “high temperature” sequel to previous investigations of four specialty inorganic coatings said to prevent corrosion under wet insulation conditions with temperature cycling both in the CUI range of -5°C to 175°C and up to ca 400°C. In the present work, two of the specialty coatings have been tested again, viz a one coat system of a titanium modified inorganic copolymer (TMIC) with aluminum flake pigmentation and a two coat system of a high performance modified silicone with MIO (Coating A). Carbon and stainless steel pipes were abrasive blasted to SSPC-SP10 near white metal and coated by spray application. The pipes were then insulated in high-water retention insulation (calcium silicate, Cal-Sil) and subjected to a CUI microenvironment of cyclic wetting and heating for 6 weeks where the maximum temperature of each cycle was ca 560°C - 600°C. Laboratory investigations were undertaken to compare and contrast the CUI performance of TMIC vs Coating A and to more accurately determine the temperature profile of the coated steel pipe under wet insulation.

Subject
Test methods, Pipe surfaces, Coating performance, Water, Coatings, Piping, Insulation, Steel pipes, Brines, Carbon steel, Corrosion under insulation, Stainless steel, High temperature
© 2013 Association for Materials Protection and Performance (AMPP). All rights reserved. This work is protected by both domestic and international copyright laws. 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).
2013
Association for Materials Protection and Performance (AMPP)
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