| 摘要 |
A semi-submersible vessel has a deck structure (10) supported on columns (11) above two hulls (12) and means to ballast it between a transit condition wherein the hulls have freeboard and an operating condition wherein the hulls and part of the columns are submerged. Two cranes (14) are mounted on the deck above the rear columns (11). A body (19) interconnects the hulls (12) below the rear columns (11), and lies underwater on the vessel's transit condition. The body provides structural strength, extra buoyancy under the cranes, and an increase in the inertia of the vessel in relation to heave and trim motions when the vessel is semi-submerged, and is streamlined to reduce drag in transit. A second body (19) may be provided at the front of the vessel close to a second pair of columns (11). <IMAGE> |
