| 摘要 |
A semi-submersible vessel 10 comprises a superstructure 12, a plurality of legs 16 extending from the superstructure and a pontoon 20 rigidly connecting respective end portions of the legs disposed remote from the superstructure to form a buoyant structure. The pontoon 20 is adapted to define storage tanks for produced liquid hydrocarbons, ballast tanks 26 for receiving sea-water ballast and a ballast zone 30 for housing semi-permanent or permanent ballast having a greater density than sea water. |
