CUI (corrosion under insulation) refers to the external corrosion on thermally insulated metals which mainly manifests as localized corrosion. The key driver behind the CUI is the soaked thermal insulation which results in both uniform and localized corrosion. There are many instances where the facility piping, and pipelines undergo flooding and submerging conditions which result in the soaking of insulation. The issue gets aggravated (i.e., prolonged soaking) for the pipes/ pipelines which are either mothballed or operate at or near the ambient temperatures. This study addresses the long-term CUI behavior of pipe assemblies applied with and without non-metallic stand-off membranes. The assemblies were submerged in water for 2 days followed by outdoor exposure for 01 year. The assemblies were tested for CUI behaviors via weight loss method and various characterization methods namely confocal laser topography and scanning electron microscopy.

Subject
Pits, Scanning electron microscopy, Time of wetness, Piping, Insulation, Moisture, Corrosion rate, Steel coupons, Pipelines, Weight loss coupons, Corrosion products, Corrosion under insulation, Corrosion coupons
Keywords:
Insulation, Corrosion under insulation, Corrosion management, stand-off membrane, Contact-free insulation, low-point drainage
© 2023 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).
2023
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.