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

1987-09-30

1989-09-26

Basinger, Sherman D.

Ships

Floating platform

Multiple leg

114123, 114124, 114264, B63B 4306

Patent

active

048691925

ABSTRACT:
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 annular in cross-section and of generally cylindrical form and terminate 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.

REFERENCES:
patent: 2963868 (1960-12-01), Armstrong
patent: 3207110 (1965-09-01), Laborde et al.
patent: 3359741 (1967-12-01), Nelson
patent: 3408821 (1968-11-01), Redshaw
patent: 4176614 (1979-12-01), Goss et al.

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