Twin hull variable draft drilling vessel

Ships – Floating platform

Patent

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Details

B63B 3500

Patent

active

RE0291676

ABSTRACT:
The vessel comprises a pair of laterally spaced elongated hulls having a plurality of upstanding columns spaced therealong supporting a working platform in spaced relation above the hulls a distance slightly greater than the maximum anticipated wave height. The hulls buoyantly support the vessel in a low draft floating condition with the hulls having freeboard. The hulls have ballast compartments to submerge the hulls and portions of the stabilizing columns to a distance of approximately half the effective height of the stabilizing columns which is slightly greater than maximum anticipated wave height, to maintain the vessel in a high draft floating condition with the platform elevated above the waterline. The columns stabilize the vessel in the high draft condition about roll and pitch axes. The working platform mounts either a drilling rig or a heavy duty crane or like operational equipment along the centerline of the vessel.

REFERENCES:
patent: 2375286 (1945-05-01), Creed
patent: 2973046 (1961-02-01), McLean et al.
patent: 3246476 (1966-04-01), Wolff
patent: 3273526 (1966-09-01), Glosten
patent: 3279407 (1966-10-01), Stenger
patent: 3294051 (1966-12-01), Khelstovsky
patent: 3385069 (1968-05-01), Estes
patent: 3397545 (1968-08-01), Leavitt
patent: 3490406 (1970-01-01), O'Reilly

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