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Thermal Analysis and Strength Evaluation of Cargo Tanks in Offshore FLNGs and LNG Carriers

[+] Author Affiliations
Bo Wang, Yong Chen, Yung-Sup Shin, Xiaozhi Wang

American Bureau of Shipping (ABS), Houston, TX

Paper No. OMAE2013-11448, pp. V003T03A050; 8 pages
doi:10.1115/OMAE2013-11448
From:
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Materials Technology; Ocean Space Utilization
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5535-5
  • Copyright © 2013 by ASME

abstract

The objective of this study is to develop a procedure for thermal analysis and strength evaluation of cargo tank structures in offshore FLNGs and LNG carriers. In this paper, a heat transfer analysis methodology has been employed, and a computational tool has been developed for its application on hull and tank structures in both membrane-type and independent Self-supporting Prismatic type B (SPB) LNG vessels. Using this method, the temperature distribution and corresponding heat transfer coefficients (HTCs) in both the hull structure and void spaces can be estimated so the appropriate steel grade can be selected for the inner hull and the boil-off rate (BOR) can be calculated for LNG vessels. Based on these estimated temperature environmental profiles and HTCs in void spaces, the detailed temperature distribution of an independent SPB tank including the tank boundary and internal structures can be calculated using steady-state thermal FE analysis. Then, the temperature distribution obtained from thermal FE modeling is applied to the FE model as loading conditions for thermal stress FE analysis on cargo tanks. In stress FE analysis, design loads usually include temperature distribution, design vapor pressure, and internal pressure caused by cargo during vessel acceleration. For temperature distribution among design loads, there are three loading conditions which are: cooling down, partial filling level, and full filling level loading conditions in an independent tank. Finally, FE results are to be used for assessing the yielding and buckling strength of a tank structure in terms of acceptance criteria. A case study for an LNG SPB tank demonstrates strength assessment considering thermal effects. The complete procedure has been developed for thermal analysis and strength evaluation of cargo tank structures in offshore FLNGs and LNG carriers.

Copyright © 2013 by ASME

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