B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
61/8, 114/58.4
B63B 35/44 (2006.01) B63B 1/10 (2006.01)
Patent
CA 1044028
ABSTRACT OF THE DISCLOSURE A variable draft, twin hull, column stabilized semi- submersible vessel comprises a pair of laterally spaced elongated hulls having at least 6 upstanding columns spaced therealong supporting a working platform in spaced relation above the hulls a distance slightly greater than the maximum anticipated wave height. longitudinally spaced trusses, including transverse members, also connect the hulls. 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 have a substantially constant cross sectional area throughout the effective length thereof and 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.
249966
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