深水半潜式生产平台立柱储油结构设计及应用

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

目前,行业内仍缺少将凝析油储存到半潜式平台船体中的经验和实践案例。本文给出了立柱中储存凝析油时深水半潜式平台船体结构的设计方案。第一,立柱凝析油舱周围需要采用双层舱壁(隔离舱),隔离舱舱壁之间采用板相连;第二,凝析油舱设计压头优化降低了20m,比同高度的压载舱仍增大了10m;第三,凝析油舱内设置了上下各空出2m的非水密连续舱壁,经过总体结构强度和疲劳分析,该舱壁方案可行;第四,在立柱底部、压载舱、凝析油舱底部多考虑2mm腐蚀裕量。本研究可为今后类似设计提供参考。

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.