Self-propelled semi-submersible service vessel
US4471708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1980 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Oct 23, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63B2001/128
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A self-propelled semi-submersible column stabilized service vessel for tending offshore production and drilling operations is disclosed. The vessel includes a pair of submersible hulls haing ballast compartments for controlling the buoyancy of the hulls. A rectangular service platform which includes fire fighting equipment, rig inspection equipment, repair facilities, and load lifting equipment is supported by means of vertical stability columns which are compartmented and include ballast chambers for controlling the buoyancy of the columns. The fire fighting equipment includes an extendable fire boom for clearing debris and for positioning explosives on the deck of a burning production or drilling platform. An array of monitors is also provided for establishing a curtain of water for thermally shielding the service vessel and for extinguishing a fire on the platform. The rig inspection equipment includes a diving bell and constant tension hoist apparatus for accurately positioning the diving bell along the sloping underwater structure of an offshore production or drilling platform. The load lifting equipment includes a revolving crane which is strategically located on the bow cent…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.