The Wärtsilä underwater mountable thrusters with designation WST-U are part of a series that comes with several added features, such as an increased power range, an 8° tilted propeller gearbox, and the Wärtsilä Thruster Nozzle providing a superior and reliable DP performance. The underwater mountable thrusters from the LMT series are available for the lower part of the power range.
· 6 x WST-55U at 5500 kW
· 3900 mm FP propeller in nozzle
· 8° tilted propeller shaft
Semi-submersible drilling rig
· 8 x WST-55U at 4500 kW
Effective DP operations
The three largest thrusters within the Wärtsilä Underwater Mountable Thruster series feature an 8 degree tilted propeller shaft and nozzle, which direct the propeller jet away from the hull and other thrusters. In addition to reducing hull interaction losses, this also greatly reduces interaction between the thrusters, thus making the so-called ‘forbidden zones’ considerably smaller. The overall gain in effective bollard pull thrust for dynamic positioning operations is about 15% when compared to conventional units.
The Wärtsilä Underwater Mountable Thruster series features the Wärtsilä thruster nozzle to provide excellent bollard pull performance.
First class reliability
Each component and aspect of the underwater mountable thruster series has been selected to achieve a high level of reliability. With the Wärtsilä PCMS (Propulsion Condition Monitoring Service), the reliability and availability of the thruster can be improved even further. As this service is recognized by the main marine class societies, the thruster overhaul intervals can be extended according to the condition of the equipment.
Compact and with less weight
Detailed FEM analyses have been made to optimize the strength of the components so as to keep the overall weight as low as possible. Compact dimensions result in less space requirements in the thruster room and more payload capacity for the vessel.
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Wärtsilä is a global leader in advanced technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation and total efficiency, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers.