Floating liquefied natural gas (FLNG) is an offshore structure which enables liquefaction, storage, and offloading of natural gas. It is a game changer in offshore hydrocarbon development. Side-by-side offloading is a promising way of transferring liquefied natural gas (LNG) from FLNG to an LNG carrier. The roll response of LNG carriers, which plays a critical role, has been observed to be influenced by the liquid cargo motion inside the tanks. Therefore, the operational window for side-by-side offloading may not be estimated robustly using a simplified method which ignores the liquid cargo and considers only the ballast condition. This necessitates a scientific understanding of the roll responses of an LNG carrier at different load conditions. In this study, a series of model tests are conducted on a bargelike vessel with two spherical tanks. The response amplitude operators (RAOs) and response spectra of the vessel in different load conditions and different headings are investigated. The effect of intermediate cargo volumes on global roll response is, for the first time, examined for spherical cargo tanks. It is suggested that intermediate loading conditions with explicit inclusion of the effects of cargo sloshing is utilized in side-by-side operability studies to robustly ascertain offloading availability.
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June 2016
Research-Article
Effect of Partially Filled Spherical Cargo Tanks on the Roll Response of a Bargelike Vessel
Wenhua Zhao,
Wenhua Zhao
Faculty of Engineering,
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: wenhua.zhao@uwa.edu.au
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: wenhua.zhao@uwa.edu.au
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Finlay McPhail,
Finlay McPhail
Shell Global Solutions BV (Shell),
Kessler Park 1,
Rijswijk 2280 AB, The Netherlands
e-mail: Finlay.McPhail@shell.com
Kessler Park 1,
Rijswijk 2280 AB, The Netherlands
e-mail: Finlay.McPhail@shell.com
Search for other works by this author on:
Mike Efthymiou
Mike Efthymiou
Faculty of Engineering,
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: M.Efthymiou@shell.com
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: M.Efthymiou@shell.com
Search for other works by this author on:
Wenhua Zhao
Faculty of Engineering,
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: wenhua.zhao@uwa.edu.au
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: wenhua.zhao@uwa.edu.au
Finlay McPhail
Shell Global Solutions BV (Shell),
Kessler Park 1,
Rijswijk 2280 AB, The Netherlands
e-mail: Finlay.McPhail@shell.com
Kessler Park 1,
Rijswijk 2280 AB, The Netherlands
e-mail: Finlay.McPhail@shell.com
Mike Efthymiou
Faculty of Engineering,
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: M.Efthymiou@shell.com
Computing and Mathematics,
The University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: M.Efthymiou@shell.com
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 4, 2015; final manuscript received January 19, 2016; published online March 30, 2016. Assoc. Editor: Yi-Hsiang Yu.
J. Offshore Mech. Arct. Eng. Jun 2016, 138(3): 031601 (9 pages)
Published Online: March 30, 2016
Article history
Received:
May 4, 2015
Revised:
January 19, 2016
Citation
Zhao, W., McPhail, F., and Efthymiou, M. (March 30, 2016). "Effect of Partially Filled Spherical Cargo Tanks on the Roll Response of a Bargelike Vessel." ASME. J. Offshore Mech. Arct. Eng. June 2016; 138(3): 031601. https://doi.org/10.1115/1.4032658
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