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Friday, July 2, 2021 

The main propulsion package for Jan De Nuls latest heavy-lift crane vessel 'Les Alizs' has left the German production plant in Wismar to reach the CMHI Haimen shipyard in China.

The full Schottel propulsion package consists of four rudder propellers, two retractable rudder propellers, and two transverse thrusters to ensure optimal propulsion efficiency as well as maximum manoeuvrability. Les Alizés is currently under construction and will be deployed for the construction of offshore wind farms after its delivery.

The main propulsion system of the crane vessel consists of four electrically driven 3MW Schottel SRP 610 RudderPropellers type SRP 610, with propeller diameter of 3.3m, installed at the stern. With this setup, Les Alizés will achieve a maximum speed of 13 knots.

To ensure precise positioning in DP mode, two Schottel Retractable SRP 610 R RudderPropellers (3,250kW each with a propeller diameter of 3.0 m) and two Schottel STT 7 2,600kW Transverse Thrusters with a propeller diameter of 2.79m are installed in the bow. The retractable units are fitted with an 8° downwards-tilted propeller shaft to reduce thruster-thruster and thruster-hull interactions and increase propulsion efficiency.

Les Alizés will mainly be used for the construction of offshore wind farms but is also suitable for decommissioning offshore oil and gas platforms. The key features include a main crane of 5,000t, a loading capacity of 61,000t and a deck space of 9,300m². With these characteristics, Les Alizés can transport heavier foundations, several in one trip, to the offshore installation site. As a result, it responds to the global trend within the offshore wind energy sector to design and install increasingly larger wind turbines. This new generation of turbines can be more than 270m high, have blades up to 120m long, and sit on foundations weighing up to 2,500t.

The crane vessel is scheduled to enter operation in 2022.

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