Wärtsilä introduces a new series of both steerable and transverse thrusters that will further develop the current portfolio.
The new Wärtsilä Steerable Thruster series (WST) will replace the company's Modular Thruster and Compact Thruster series, while the new Wärtsilä Transverse Thruster series (WTT) replaces the current range of transverse thrusters. The new products have been developed in response to changing market demands, requiring competitive thruster products which are more efficient and cover a wider power range.
Steerable Thruster
This major product development project was launched by the company's Propulsion R&D in 2011. The latest thruster designs were implemented using numerical simulation tools. The first product to enter the pilot phase is a 4500 kW under water (de)mountable steerable thruster, the WST-45-U, which began its pilot phase in summer 2013. Two more products, the WST-14 and the WTT-11, are scheduled to begin their pilot phase before the end of this year.
Various Vessel Types
The new thrusters are available for various types of vessel depending on the size and features of the product. For example, the WST-45-U is designed mainly for the offshore drilling market; the WST-14 is intended for tugs up to 45tBP, inland waterway vessels, and for river/sea going cargo ships. This thruster is compatible with both medium speed and high speed (1800 rpm) diesel engines. The WTT-11 is a 1100 kW tunnel thruster designed mainly for merchant cargo vessels.
Increased Power Range, Tilted Propeller Gearbox and New Nozzle
The new WST and WTT units come with several added features, such as an increased power range, an 8° tilted propeller gearbox, and a new thruster nozzle for the thrusters designed for offshore drilling. The new thrusters intended for tug boat applications also have the new nozzle, which improves performance and has a high level of system integration. The new tunnel thrusters are more compact and efficient than earlier versions.
Picture: Wärtsilä Steerable Thruster WST-45-U
