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Lateral Buckling Analysis and ECA for Pipeline With Complex Temperature Profile

[+] Author Affiliations
Zhengmao Yang, Yadhavaraj Mageshwaran, Vijay Kittur, Gerry Lim, Hong Kiat Chia

IntecSea (WorleyParsons Group), Singapore

Paper No. OMAE2012-83853, pp. 707-715; 9 pages
doi:10.1115/OMAE2012-83853
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4490-8
  • Copyright © 2012 by ASME

abstract

Lateral buckling analysis of a 32 inch export pipeline operating under high temperature and high pressure in sour service environment was evaluated in this paper. In addition Engineering Critical Assessment (ECA) as per DNV-OS-F101 Appendix A was performed to derive flaw acceptance criteria for pipeline girth weld fabrication during installation.

Due to the sour operating environment, low fracture toughness and increased fatigue crack growth rate during operation is expected. Consequently stringent tolerable flaw sizes are obtained for the pipeline sections subject to large strain arising from lateral buckling. In order to improve the reliability of the design and constructability of the pipeline, sleepers will be used to introduce vertical imperfections and initiate buckles at selected locations. In undertaking this it can be illustrated that all the potential lateral buckles are predetermined and pipeline sections with large strains are identified. The stringent tolerable flaw criteria from ECA are applied only on the identified high strain sections.

In this paper the design of sleepers and the influence of these additional sleepers on the lateral buckling behavior are investigated.

Copyright © 2012 by ASME

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