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there will be no problems with icing," he said. "It is interesting and also quite nice that people are thinking new when it comes to hull design. Little work has been done on developing new hull designs for sup- ply vessels, and there has been no focus on speed and fuel consumption.

Supply vessels have remained almost unchanged for 20 years," said Rolf Riksheim, a group leader at

Marintek.

The 260 m ship model basin at Marintek in

Trondheim is the only one of its kind in Norway, and is the largest in the Nordic countries.

In addition to this, the research institute has a 50 by 80 m sea basin. With the help of the basins, one can simulate wind, waves and currents, and test models of new vessel types before actually commencing con- struction of the vessels. The ship model basin at

Marintek was opened in 1939 and was originally 170 m long.

The facility was intended to serve the shipping indus- try and the growing shipyard industry in Norway. It has also always been used by the Norwegian University of

Science and Technology (NTNU) in its teaching of shipping students.

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May 2005 37

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NorShipping 2005

Wärtsilä Propulsion for New AHTS

The new Anchor Handling Tug Supply vessel of

Ulstein AX104 design will be equipped with generat- ing sets, tunnel thruster, steerable thrusters, control system and seals from Wärtsilä. In March the compa- ny 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 tow- ing 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 Ulstein AX104 design from Ulstein Design

AS, with an inverted bow intended to eliminate slam- ming and allow higher speeds in all sea conditions.

The vessel will be one of the world's first AHTS ves- sels with diesel-electric propulsion. It also has innova- tion in safety, being equipped with a newly-developed system for safer anchor handling. It has a DP2 dynam- ic positioning system. Measuring 274 x 60.6 ft. (83.6 x 18.5 m), 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 maneu- vering 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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