Wärtsilä has unveiled its new WTT-40 transverse thruster at the Seatrade Cruise Global convention in US.

The product is a part of Wärtsilä’s new transverse thruster series and has a 4000kW power level and a 3400mm diameter controllable pitch propeller.

The development of the WTT-40 thruster commenced last year to address the customer’s requirement of high power transverse thrusters for bow and stern applications.

The first of the WTT-40’s had been ordered and is expected to be delivered later this year.

The system can be leveraged by a range of vessel types including cruise ships, large offshore support vessels (OSVs) and offshore construction vessels (OCVs).

The high power level offered by the system is utilised during the harbour manoeuvring and docking of large ships, as well as for dynamic positioning of offshore vessels working in heavy sea conditions.

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A power level of 4000kw offered by the thruster, limits the usage to three WTT-40 thrusters instead of four smaller ones.

This reduces the space to be occupied by the thrusters which subsequently allows them to be located at the vicinity of the bow where they are more effective.

The WTT-40 and the other ranges of thrusters are available in variable configurations with controllable pitch and fixed pitch propellers to suit to a broad range of vessel design requirements.

It is incorporated with Wärtsilä’s computational fluid dynamics (CFD) analysis which facilitates propulsion performance, efficiency, and the reduction of noise and vibration.

Wärtsilä Marine Solutions vice-president Arto Lehtinen said: "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.

"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."

Wartsila‘s WTT-40 will be aligned to the US Environmental Protection Agency (EPA) VGP2013 regulations, under which the thruster will be lubricated by environmentally acceptable lubricants (EALs) in all oil-to-sea interfaces, such as the propeller shaft seal of transverse thrusters, when vessels are sailing in US coastal waters.

The thruster has an integrated hydraulics which reduces the shape occupied by the machine and reduces the installation and commissioning time in the shipyard.

Separately, Wartsila has inked a five-year maintenance agreement with the Nigerian gas transportation company Bonny Gas Transport (BGT) to maintain and service the engines on board its six new LNG carriers and deliver spare parts, coupled with delivering expertise for inspections and major service upgrades.

Image: The WTT-40 addresses market requirements for high power transverse thrusters for bow and stern applications. Photo: courtesy of Wärtsilä.