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A ship-shape vessel with one crane or semi-submersible vessel with one or two cranes for lifting platform modules and structures at sea. The crane hoisting capacities are substantial and range from 300 tons to 8000 tons. Cranes allow for moving the hook-load vertically and horizontally (in a 360 degree radius). Nowadays also frequently used to install heavy equipment on the seabed. In medium water depths the crane vessel is anchor-moored. In deepwater areas the vessel is dynamically positioned. alt text



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