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Creep Damage Analysis of High Pressurized Steam Pipelines Using Omega Method

[+] Author Affiliations
Gong H. Jung, Parikh Prashant, Jorge Penso, Dong S. Kim

Shell Global Solutions (US), Inc., Houston, TX

Paper No. PVP2008-61662, pp. 393-400; 8 pages
doi:10.1115/PVP2008-61662
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications and Components
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4830-2 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME

abstract

Cracks, bulges and leaks have been found in weld-o-let connections that were installed in high-pressure steam lines. Creep has been known as one of failure mechanisms associated with cracks on the weld-o-let connections. A success of weld repairing of the creep-damaged connections strongly relies on how well the creep-damaged material is removed. The FE (finite element) model was developed to predict the creep damage on the weld-o-let connections. Omega creep model and time fraction damage model were incorporated. The developed FE model successfully explained why cracks were found on the outer surface of saddle point in most of the connections. The results of creep analyses were successfully incorporated into development of a weld repair plan of the creep damaged connections.

Copyright © 2008 by ASME
Topics: Creep , Pipelines , Steam

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