B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
61/6
B63B 21/50 (2006.01) B63B 22/02 (2006.01)
Patent
CA 1134154
ABSTRACT OF THE DISCLOSURE For mooring a vessel such as an oil tanker, especially in shallow water, a squat base unit is located on the sea bed. The lower end of an articulated swivelling arm is built into the base unit in such a way that the upper end is free to rotate about three axes and to move vertically and horizontally around and over the base unit within the confines of a circle whose radius is defined by the geometry and weight of the arm and the height and attitude of the top section of the arm. A hawser, attached to the head of the arm, enables the head to be lifted by a tanker until the head of the arm engages into a reception chamber built into the underside of the tanker hull. By hauling in the hawser and lifting the head, the tanker locates itself within a working radius of the base unit and is moored by the arm to the base unit. The head of the mooring arm is held rigidly in the reception chamber and is able to move with the ship by virtue of its' freedom of movement. The base unit can take the form of an oil reservoir and the arm can be formed of hollow tubes which are used to transfer fluid between the base unit and the tanker. When not in use the mooring arm lies flat on the base unit on the sea bed (or within a depression in the sea bed), where it is in no danger of damage from deep keels.
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