Wärtsilä Equipment
Wärtsilä retractable thrusters for unmatched manoeuvrability and station keeping
Wärtsilä WST-R retractable thrusters, 750 kW to 6.5 MW in L- and Z-drive, with an 8-degree tilted propeller shaft for 15–20% more effective thrust in DP station keeping; underwater-mountable WST-RU versions.
Description
Wärtsilä retractable thrusters (WST-R) are designed for reliable dynamic positioning and station keeping in demanding offshore conditions. An 8-degree downward tilt of the propeller shaft minimises thruster-hull interaction, increasing available thrust by 15–20% compared with non-tilted thrusters, so less installed power is needed for the same DP capability.
Range
- Retractable: WST-09R, WST-14R, WST-18R, WST-24R, WST-32R, WST-45R
- Underwater mountable: WST-55RU, WST-65RU
- Power range 750 kW to 6,500 kW, in L-drive and Z-drive options
Key features
- Full retraction reduces vessel resistance and allows operation in shallower waters and ports
- Minimised footprint in the vessel
- Underwater mounting allows thruster maintenance while afloat, avoiding dry-docking
- WST-R up to WST-32R factory-assembled and pre-aligned for easier installation
- Weight savings of 30–40 tonnes per thruster possible through design optimisation with the OPTI-DP™ Engagement Tool
- Based on more than 300 retractable thrusters delivered over 50 years
Applications
Wind turbine installation vessels, offshore support and construction vessels, cable layers, shuttle tankers, heavy lift vessels and semi-submersible crane vessels.
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