Patent ID: 8997888
Filing Date: 2015-04-07
Classification: B63B,B66C

Abstract:
1. A multi purpose hoisting device for use on a floating vessel having a deck, the hoisting device comprising: a load bearing structure to be mounted on the vessel; a main hoisting mechanism for raising and lowering an object above the deck of the vessel, the main hoisting mechanism comprising: i. at least one main hoisting winch; ii. an upper cable pulley block supported by the load bearing structure; said upper cable pulley block comprising multiple pulleys; iii. a travelling cable pulley block comprising multiple pulleys, provided with an object connecting device for releasable connecting an object to the travelling cable pulley block; iv. a main hoisting cable associated with the at least one main hoisting winch, the main hoisting cable being passed over the pulleys of the upper cable pulley block and the pulleys of the travelling pulley block in a multiple fall configuration, such that the travelling cable pulley block is moveable relative to the load bearing structure by using the at least one main hoisting winch; a main hoist heave compensation mechanism associated with the main hoisting cable for damping the effect of sea-state induced motion of the vessel onto an object supported by the main hoisting cable; wherein the multi purpose hoisting device further comprises: a deepwater hoisting mechanism for raising and lowering an object to an installation site in deepwater, the deepwater hoisting mechanism comprising: i. a deepwater hoisting winch; ii. a deepwater hoisting cable, the deepwater hoisting cable running along a path from the deepwater hoisting winch to a top pulley supported by the load bearing structure, wherein from the top pulley, the deep water hoisting cable is suspended for supporting a load, and the path of the deepwater hoisting cable is distinct from the main hoist heave compensation mechanism; iii. an object connecting device for releasable connecting an object to the deepwater hoisting cable; and a releasable attachment mechanism adapted to selectively interconnect the main hoisting cable and the deepwater hoisting cable such that the heave compensation mechanism associated with the main hoisting cable is operable in combination with the deepwater hoisting cable.