Wärtsilä Retractable Thrusters

Wärtsilä retractable thrusters are used with dynamic positioning (DP) systems or provide additional thrust capacity for station keeping. Depending on project requirements, they can also be used for main or emergency propulsion. They are available in power ranges from 850 to 6500kW in both L-drive and Z-drive options, and which can be installed onto a wide range of vessels, including offshore support vessels, offshore construction vessels, shuttle tankers and special vessels such as dredgers or heavy lift vessels.

The vertical retraction system minimizes space requirements in the vessel and enables full retraction to lower the vessel resistance during transit to or from the operation area or sailing in shallow waters. When deployed, the thrusters can be independently rotated through 360°, making vessels extremely manoeuvrable with a high thrust performance and excellent DP functionality.

The WST-24R is the industry’s first retractable thruster with a titled propeller shaft and combined electric retraction and steering!"

Why choose Wärtsilä

The excellent efficiency and performance of Wärtsilä retractable thrusters are further enhanced by an 8 degrees tilted propeller shaft, available on the latest retractable thruster models released by Wärtsilä. With these models, Wärtsilä is able to offer customers a retractable thruster with the lowest thruster hull interactions, making it the most efficient retractable thruster package in the market. The unique design means that customers can expect up to 20 percent more effective thrust than conventional non-tilted thrusters, depending on vessel configuration and application.


    Wärtsilä Modular Thrusters (LMT)
    Wärtsilä Modular Thrusters (LMT) with a modular and flexible design are the basis for the retractable thrusters up to 4500 kW.

    Key Benefits
    • Excellent hydrodynamic performance
    • 0°, 3° or 5° tilted Wärtsilä HR Nozzle
    • Fully retracted during transit; optional hull closing plate
    • Fast retraction and deployment
    • L- and Z-drive options enable integration in a wide range of vessel types and sizes
    Wartsila-Modular-Thrusters-(LMT)
    Wärtsilä WST-24R

    The Wärtsilä WST-24R is a powerful retractable thruster designed to provide auxiliary manoeuvring capability in dynamic positioning or station keeping operations. The 2400 kW power level makes it an ideal choice for shuttle tankers, and many offshore support and construction vessel types.

    The excellent hydrodynamic efficiency and performance of the Wärtsilä steerable thrusters is enhanced by the 8 degree tilted propeller shaft, which provides to customers with a retractable thruster that has the lowest thruster hull interactions, making it the most efficient retractable thruster package in the market. The unique design means that customers can expect up to 20 percent more effective thrust than conventional non-tilted thrusters, depending on vessel configuration and application.

    Key Benefits:

    • Excellent propulsion efficiency and 8 degrees tilted propeller shaft for high effective thrust to efficiently perform demanding DP operations.
    • Retractable to improve vessel free-sailing efficiency and enable operations in shallow water; optional hull closing plate
    • Less power needed for first class performance thus lowering operational cost (OPEX)
    • Combined electric driven steering and retraction system reduces thruster room space requirement.
    • Plug and play pre-aligned package for simple and fast installation.
    • Compact design allows larger propeller within the same vessel envelope space.
    • Optional compliance with CLEAN notations and US EPA VGP2013 requirements.
    • Key components, such as the steering and retraction seals can be maintained inboard 

    Wärtsilä-WST-24R
    Wärtsilä WST-65RU

    The Wärtsilä Retractable Underwater Mountable Thruster (WST-65RU) has been designed to meet the needs of large offshore construction vessels (OCVs) as well as semi-submersible rigs and drill ships.

    With its power output up to 6500kW it is typically designed for vessels that require thrusters that can be retracted during transit of while entering shallow waters, to increase the level of operational flexibility. Additionally, the WST-65RU thruster can be mounted or de-mounted while the vessel is afloat, to facilitate thruster maintenance and overhaul during the operational lifecycle. The WST-65RU is the first retractable thruster in the market to feature the unique combination of retractable and underwater mountable functionality.

    The WST-65RU is based on the WST-65U underwater mountable thruster which has been designed with performance and reliability as key requirements. The 8 degree tilted propeller shaft solution is a feature which is also found on Wärtsilä Underwater Mountable thrusters and reduces the interaction between the thrusters and hull significantly, thereby enhancing the dynamic positioning performance of the vessel. The outboard part of WST-65RU is exchangeable with WST-65u, optimizing maintenance and spare part strategies.

    In combination with Wärtsilä’s PCMS (Propulsion Condition Monitoring Service) downtime and maintenance costs can be minimized.

    Key Benefits
    • Excellent propulsion efficiency and 8 degrees tilted propeller shaft for high effective thrust to efficiently perform demanding DP operations.
    • Retractable to improve vessel free-sailing efficiency and enable operations in shallow water; optional hull closing plate
    • Thruster outboard part can be exchanged without dry docking the vessel: mounting and de-mounting while afloat.
    • Use of telescopic shaft technology allows the E-motor to remain static.
    • Integrated solution provides smallest possible area footprint and overall lighter construction.
    • Based on proven recognizable technology and in-house propeller design know-how.
    • High reliability


    Wärtsilä-WST65-RU
    Thruster Type Range Main Dimensions Weight 3
    L-drive Z-drive Propeller Type Max. propeller diameter L-drive Z-Drive
    Max. Power Input Speed Max. Power Input Speed Width x Depth x Height 1 Width x Depth x Height 2
    [kW] [rpm] [kW] [rpm] [mm] [mm x mm x mm] [mm x mm x mm] [Kg]
    LMT CS/FS175MNR 1000 1200 1000 1200 FP or CP 1700 2950 x 2700 x 7700 2950 x 2700 x 6000 18000
    LMT CS/FsS200MNR 1200 1200 1200 1200 FP or CP 1900 3050 x 2850 x 8600 3050 x 2850 x 6446 20000
    LMT CS/FS225MNR 1600 900 1600 1200 FP or CP 2100 3590 x 3300 x 9000 3590 x 3300 x 7331 22000
    LMT CS/FS250MNR 200 720 2000 900 FP or CP 2400 3666 x 3710 x 10000 3666 x 3710 x 8115 34000
    WST-24R 2400 900 2400 1200 FP 2800 4410 x 4090 x 11689 4410 x 4090 x 9700 48500
    LMT FS2510MNR 2850 720 3250 900 FP 3200 4500 x 4900 x 14460 4500 x 4900 x 11573 110000
    LMT FS3500MNR 3850 720 4500 720 FP 3600 4770 x 5845 x 16745 4770 x 5845 x 14232 132000
    WST-65RU 6500 600 FP 4200 5980 x 5550 x 20100 212500

    Remarks
    Other input speeds and power levels for LMT type retractable thrusters available on request.
    Maximum power level can be lower depending on classification society. Selections are not valid for classification with iceclass.
    The indications for dimensions and weight can vary depending on propeller type, propeller size and project specific customizations.
    1 Height indication is for L-drive execution with large diameter FP propeller, including gerenic E-motor
    2 Height indication is for Z-drive execution with large diameter FP propeller
    3 L-drive execuion excluding the E-motor and oil; LMT 2510 and 3500 type: Z-drive excluding the E-motor and oil

    Animation

    Application & vessel configurations

    Wärtsilä Modular Thrusters (LMT)


    Anchor Handling Tug Supply vessel (AHTS)
    • 1 x 1200 kW retractable (bow)
    • FP propeller
    • Diesel-Electric
    • L-drive
    Pipe Laying Vessel
    • 1 x 2400 kW retractable
    • FP propeller
    • Diesel-Electric
    • Z-drive

    Wärtsilä WST-24R


    Multi-purpose offshore support (MPSV) vessel
    • 2 x WST-45U at 4000kW (main propulsion, underwater mountable, with 8 degrees tilted or straight propeller shaft)
    • 1 x WST-24R at 2400kW (auxiliary propulsion, retractable, with 8 degrees tilted propeller shaft
    • 1 x WTT-28 at 2400 kW
    • All propulsors in L-drive configuration for Diesel-Electric propulsion
    Shuttle Tanker
    • 2 x WCP at 7500kW (controllable pitch propellers for main propulsion)
    • 1 x WST-24R at 2400kW (auxiliary propulsion, retractable, with 8 degrees tilted propeller shaft)
    • 1 x WTT-28 at 1950 kW
    • All thrusters in L-drive configuration for Diesel-Electric propulsion

    Wärtsilä WST-65RU


    Semi-submersible crane vessel
    • 4 x WST-65U at 5500kW (main propulsion, underwater mountable)
    • 4 x WST-65RU at 5500kW (auxiliary propulsion, retractable underwater mountable)
    • 4200 mm FP propeller in nozzle
    • 8 degrees tilted propeller shaft
    • Diesel-electric
    • L-drive
    Drillship
    • 3 x WST-55U at 5500kW (main propulsion, underwater mountable)
    • 3 x 5500kW retractable underwater mountable thruster (auxiliary propulsion)
    • 3900 mm FP propeller in nozzle
    • 8 degrees tilted propeller shaft
    • Diesel-electric
    • L-drive

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    References

    • RRS Discovery
      The Royal Research Ship Discovery is designed to support the multidisciplinary research required for the 21st century. The ship is the fourth vessel to bear the name and continues the tradition of oceanographic research at sea.

      RRS Discovery

    • Nor Valiant
      Delivered in 2008, the 78m ROV / Subsea Vessel Nor Valiant is a highly specialized vessel designed by Wärtsilä Ship Design for a wide range of subsea support work.

      Nor Valiant

    • Normand Installer
      Delivered in 2006, the Offshore Construction Vessel Normand Installer by Wärtsilä Ship Design is equipped with a complete Wärtsilä package.

      Normand Installer

    • Technip Global 1200
      Upgraded AVR secures dynamic positioning for Global 1200.

      Technip Global 1200

    Press releases

    Article

    The new Shuttle Tanker

    The new Shuttle Tanker concept developed by the world’s largest provider of shuttle tanker services...
    5 December 2017
    • In Detail article

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