Huisman, the Netherlands' specialist in lifting, drilling, and subsea solutions, has introduced a new rope luffing knuckle boom crane to better provide for subsea installation in increasingly deeper water and in severe weather conditions. These new active heave compensated (AHC) cranes provide the benefits of a normal rope luffing crane and a traditional knuckle boom crane. Capacities of the new cranes range from 400 up to 1,200 tonne and up to 5,000m water depth. All of this means that the overall construction weight of the crane can be kept low, whilst allowing for a high lifting capacity and large lifting radius. By incorporating a knuckle in the design of the crane it is possible to reduce the pendulum of the hook and, if extended, it can allow for high lifting heights.
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