Ocean Engineering Equipment and Technology ›› 2023, Vol. 10 ›› Issue (2): 8-13.doi: 10.12087/oeet.2095-7297.2023.02.02

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The Hull Structure Design and Practice of the Condensate Storage Tank of Semi-Submersible Platform

LIU Xiaoyan1 , FENGJiaguo2 , LI Da3   

  1. 1. CNOOC China Limited , Beijing New Energy Company , Beijing102209 , China ; 2. China National Offshore Oil Corporation, Beijing100010 , China ; 3. CNOOC ResearchInstitute , Ltd . , Beijing100028 , China
  • Online:2023-07-02 Published:2023-07-02

Abstract: There is little industrial experience and projects for semi-submersible platform with large volume condensate storage tanks. The hull structure design of condensate storage tanks were provided. Firstly, the column was designed with the double-wall voids (cofferdams ) around the condensate tanks and connected with flats with manholes for maintenance access. Secondly, the pressure head of condensate tank was increased by 10 m compared to the ballast tank after optimizing the reduction of 20 m. Thirdly, the bulkheads of condensate tank are non-watertight and continuous, but with the upper and lower 2 m height gaps for the flowing of condensate and gas. Fourth, the additional corrosion margin of 2 mm was added to the boundary of frequently ballast and de-ballast tanks in the nodes and columns. It is a successful practice for other similar design in the future.

Key words: hull structure, semi-submersible platform, condensate oil storage, strength and fatigue, cofferdam, pressure head.

CLC Number: