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Wartsila launches new 4,000 kW transverse thruster

Written by Nick Blenkey
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MARCH 14, 2016 — Wärtsilä is using this week’s Seatrade Cruise Global event in Fort Lauderdale, FL, to launching its new WTT-40 transverse thruster.

The first WTT-40’s have been ordered and are scheduled for delivery during 2016.

Part of Wärtsilä’s new transverse thruster series, the WTT-40 features a 4,000 kW power level and a 3,400 mm diameter controllable pitch propeller, neither of which have been available in Wärtsilä’s current tranverse thruster product range, although the company has designed and built customized versions of up to 5,500 kW.

The WTT-40 and others in the WTT range address customer needs for high power transverse thrusters for bow and stern applications.

Development work on the Wärtsilä WTT-40 began in 2015 in response to market demand. It is intended for various vessel types, notably cruise ships, large offshore support vessels (OSVs) and offshore construction vessels (OCVs). The high power level is particularly important for the harbor maneuvering and docking of large ships, and for dynamic positioning of offshore vessels working in heavy sea conditions.

Because of its maximum power of 4,000 kW, shipyards and cruise ship designers can often utilize three WTT-40 thrusters instead of four smaller ones. This creates a more efficient vessel design with less space required for the transverse thrusters. It also allows the thrusters to be located closer to the bow where they are more effective.

For the WTT-40 and other sizes of thruster in the WTT series, configurations with controllable pitch and fixed pitch propellers are available to fulfill a broad range of vessel design requirements.

Wärtsilä’s extensive experience with propeller design and tunnel optimizations using computational fluid dynamics (CFD) analysis, ensures an optimal solution in terms of propulsion performance, efficiency, and minimization of noise and vibration.

“The addition of the WTT-40 to our thruster portfolio represents an important enhancement of Wärtsilä’s strong offering to the cruise and offshore sectors. Our unique position as a total solutions provider creates significant time and cost saving benefits for both ship owners and yards,” says Arto Lehtinen, Vice President, Propulsion, Wärtsilä Marine Solutions.

The Wärtsilä WTT-40 complies with the US EPA’s (Environmental Protection Agency) VGP2013 regulations. These state that environmentally acceptable lubricants (EALs) must be used in all oil-to-sea interfaces, such as the propeller shaft seal of transverse thrusters, when vessels are sailing in U.S. coastal waters.

The new thruster also features integrated hydraulics to save machinery room space and installation and commissioning time in the shipyard. For owners, the integrated hydraulics provide reliability and maintainability benefits .

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