Semi-submersible drilling unit with cylindrical ring floats

Details Semi-submersible drilling unit with cylindrical ring floats Semi-submersible drilling unit with cylindrical ring floats

B - Operations, Transporting

63

B

114/58.2

B63B 35/44 (2006.01) B63B 22/18 (2006.01) B63B 39/02 (2006.01)

Patent

CA 1250491

Abstract of the Disclosure There is described a vessel such as a semi-submersible drilling unit having a drilling deck structure with a plurality of columns depending from the deck. Pontoons are provided at the ends of the columns and a buoyant configuration modifying sleeve- like element is mounted around the columns. The sleeves are annu- lar in cross-section and of generally cylindrical form and termi- nate at their lower ends in cuffs of reducing outer diameter. This provides an inwardly tapered or curved end to the sleeve. A cable and pulley arrangement is provided for vertically moving the sleeves along the columns and for locating them on the columns close to the unit transit waterplane and at a survival waterplane position.

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