Dutch offshore lifting, drilling and subsea equipment firm Huisman has developed a new series of large, offshore cranes capable of use in ultra-deepwater and with capacities of up to 900 metric tonnes (mt).
The series includes a 300mt/600mt AHC (active heave compensated) subsea crane and a 450mt/900mt AHC subsea crane.
They are based on Huisman's 200/400mt offshore mast crane.
The main hoist of the new cranes will be outfitted with either a 300mt or 450mt traction winch.
A storage winch will be placed in the hold of the vessel to keep the center of gravity as low as possible.
This winch can store either 200mt, 400mt, or 600mt of wire rope. The wire rope can be reeved into two falls to achieve the maximum capacity and also improve handling and extend wire rope life.
Huisman will also use a patented anti-twist device on the cranes, to mitigate the risk of the twisting of lower block and wire rope during subsea lifts in double-fall configuration.
Heave compensation on the main hoist is achieved by using a combined active and passive system.
Huisman has had two orders for the new cranes. The first is from Norway-based Vard, a division of Italian shipbuilder Fincantieri.
A 900mt AHC subsea crane will be installed on a 161m offshore subsea construction vessel being built for Norway's DOF Subsea.
The second, a 600mt AHC subsea crane, will be installed on a new 160m DP3 heavy construction and flexible pipelay vessel Subsea 7.
The vessel will be built by the Korean shipyard Hyundai Heavy Industries (HHI).
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