Hydraulic steering system semi-submersible crane vessel
Eight sets of electrically driven hydraulic redundant (2x 100%) power packs for driving the steering system of steerable azimuth propulsion thrusters. This propulsion system is installed under the largest semi-submersible crane vessel in the world. This crane ship is equipped with two cranes that can lift over 15,000 tons each.
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To keep the vessel in the correct position during lifting operations, regardless of wind and water currents, the vessel is equipped with steerable propellers in a DP3 (Dynamic Positioning) system.
These propulsion propellers have a mechanical propulsion capacity of up to 6.5 MW each and are retractable, allowing them to be pulled into the hull of the crane vessel to access shallow waters and harbors as well. The propellers are rotated 360 degrees through a hydraulically closed system to provide thrust in the correct direction for positioning. Motrac Industries supplied the hydraulic power pack and a manifold with the necessary functionality on the hydraulic motors for each propulsion screw.
The two pump sets per powerpack both consist of a 250 kW electric motor with a variable Linde HPV 165+165cc closed loop tandem pump behind it. Both pump sets are connected to a central manifold allowing them to be switched independently of each other on the closed system. This creates the desired redundancy on the powerpack side. A water/oil plate heat exchanger was installed for cooling. These sets were built, tested and delivered under Lloyd's Register classification.
