Low cycle fatigue is a dominating damage mechanism for coke drums due to the batch cyclic operation and water quenching process. Resistance to low cycle fatigue is one of the major considerations when designing new drums. In a major coke drum replacement project, lab testing was employed to assist selection of weld profile, welding processes for clad restoration, and to generate the fatigue curves for the specific weld design. This paper summarizes part of the main testing results and findings from the lab testing program, using samples made with C-0.5Mo steel with Alloy 625 cladding. These testing results supported design selection for better fatigue resistance and are anticipated to increase service life of the new coke drums.

Subject
Test methods, Materials, Materials performance, Metal surfaces, Crack initiation, Stress cracking, Stress, Coke, Bending, Fatigue, Alloys, Cracks, Weld metal
Keywords:
Low cycle fatigue, coke drum, weld design
© 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)
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