Wärtsilä Propulsion for New Ulstein AHTS

Wednesday, April 20, 2005
The new Anchor Handling Tug Supply vessel of Ulstein AX104 design will be equipped with generating sets, tunnel thruster, steerable thrusters, control system and seals from Wärtsilä. In March the company received a major contract from Ulstein Verft AS in Norway for a package of generating sets, thrusters, control system and seals for an anchor-handling towing supply (AHTS) vessel ordered by Bourbon Offshore Norway AS, a subsidiary of the French marine service company Groupe Bourbon.

Due for delivery in May 2006, the new AHTS vessel is of the distinctive Ulstein AX104 design from Ulstein Design AS, with an inverted bow intended to eliminate slamming and allow higher speeds in all sea conditions.

The vessel will be one of the world's first AHTS vessels with diesel-electric propulsion. It also has innovation in safety, being equipped with a newly-developed system for safer anchor handling. It has a DP2 dynamic positioning system. Measuring 83.6 m long by 18.5 m wide, the vessel is capable of a speed of 17.5 knots. The vessel's minimum bollard pull is 180 tons.

It will be equipped with six Wärtsilä generating sets having a combined electrical output of 14,850 kWe. Four of the generating sets are driven by six-cylinder Wärtsilä 32 engines and two by nine-cylinder Wärtsilä 20 engines. These will supply a propulsion and maneuvering system comprising two Lips CS3500/3500WN main steerable thrusters, a Lips CS250-250/MNR retractable bow steerable thruster and a Lips CT250M-D bow tunnel thruster. The main steerable thrusters, each with a power of 5000 kW, will have controllable-pitch (CP) propellers of 3.6m diameter running in Lips HR nozzles. The 1800 kW bow steerable thruster will be equipped with a 2.4m-diameter CP propeller, while the 1200 kW bow tunnel thruster will have a 2.5m-diameter CP propeller. The four thrusters will be fitted with JMT MkII Unnet shaft seals. The thrusters will all be controlled through a Lipstronic/T control system that provides both joystick control for maneuvering and full dynamic positioning.

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