High Temperature Hydrogen Attack (HTHA) is a complex damage mechanism that continues to defy investigators trying to make predictions on the anticipated degree of damage or service life. This article provides some background on HTHA, discusses some current developments in HTHA inspection and mitigation, and describes how several refiners have instituted an HTHA risk management plan for their refineries and the challenges and pitfalls they have encountered. This paper also describes a new innovative screening methodology that has been used to screen over 100 equipment items operating in high temperature hydrogen services that needed individualized risk management plans. Materials included in the evaluations are carbon steel (CS), C-0.5Mo, C-Mn-0.5Mo, 0.5Cr-0.5Mo, 1Cr, and 1.25Cr equipment ranging in service exposure of 10 to over 50+ years. Several examples are provided.

Subject
High temperature hydrogen attack, Materials, Industries, Inspection, Refineries, Partial pressures, Force, Steel, Equipment, Risk management, Carbon steel, Damage, Hydrogen
Keywords:
high temperature hydrogen attack, HTHA, API 941, Nelson Curves, risk assessment
© 2016 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).
2016
Association for Materials Protection and Performance (AMPP)
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