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[2008] Ultimate Limits State Assessment of the M.V. Derbyshire Hull St…

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Journal of Offshere Mechanics and Arctic Engineering
Vol.130, No.2, pp.021002-1 - 021002-9, May 2008


Ultimate Limits State Assessment of the M.V. Derbyshire Hull Structure


Author(s): Jeom Kee Paik, Jung Kwan Seo and Bong Ju Kim



Abstract:
The capsize bulk carrier, M.V. Derbyshire, sank in the North West Pacific during typoon Orchid in September 1980 when she was on a voyage from Canada to Japan carrying fine iron ore concentrates. Since then, extensive investigations of the vessel sinking have previously been made in the literature primarily by the formal safety assessment technique to explore the loass causes, but serious speculation on the failure of hull structures has been lacking in such inverstigations. The present paper investigates the possibility of the vessel sinking initiated by the failure of hull structures rather than by other loss scenarios, such as hatch cover failure subsequent to water ingress into the cargo holds. Ultimate limit state assessments of individual stiffened panels and hulls of the M.V. Derbyshire under extreme bending moments during the last voyage in storm are made using ALPS/ULSAP and ALPS/HULL computer progrmas. It is concluded that the M.V. Derbyshire could have sunk by hull girder collapse with or even without unintended water ingress into cargo golds. Important insights and findings developed from the present study are summarized.

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