Retractable Azimuth Combi Thruster

Azimuth Thruster for positioning, track keeping and redundant "take home" function - Tunnel Thruster for port manoeuvring

Direct power transmission using a vertical top-mounted electric motor eliminates the need for special shaft and quick-release coupling arrangements when the thruster is lowered into and retracted from the working position. This solution also eliminates the need for gearboxes to connect the prime mover to the thruster – resulting in better total efficiency.

Design Principle with valuable customer features

The Brunvoll combined Retractable Azimuth / Tunnel Thruster is a retractable Azimuth Thruster that also can be used as a conventional tunnel thruster. It provides unique opportunities for innovative and flexible use of thruster functionality.

Shaped like a long column, installed vertically in the thruster compartment
Lowered into operating position and retracted into the hull by means of hydraulically operated lifting equipment
When Thruster is retracted, it is mechanically locked by means of spring loaded locking devices and the hull opening will be closed by a flush-plate attached to the bottom of the propeller nozzle
Delivered with azimuth arrangement as well as retracting arrangement and guiding column in pre-assembled condition fitted on the tank top/sea chest integration plate
This arrangement will allow for easy installation/integration of the complete Thruster Unit
When in lowered operating position the thruster unit is "locked" and pre-loaded in this position by means of the hydraulic lifting/lowering actuators
When the thruster is in operating position but not turning, the azimuth movement is locked by mechanical brakes
The stem housing is moving through a combined sealing box and bearing housing which is mounted to the tank top/sea chest integration plate

Subsea Unit designed for heavy duty operations and low life cycle cost

Robust design, generous dimensions, and attention to details make for trouble-free performance.
Brunvoll focuses on excellent technical solutions to ensure that our thruster units can handle all the challenges of the marine environment.
Replaceable propeller blade bearing liners
Propeller blades are replaceable inside the duct
Various propeller blade materials and designs available
Controllable pitch propeller and fixed pitch propeller versions available

Advanced multiple sealing system

An advanced multiple sealing system is used for the propeller shaft to provide an ideal environment for the working parts
Non-polluting sealing solutions available for use of Environmentally Acceptable Lubricants (EAL). Limited amounts of EAL required
The design complies with US EPA Vessel General Permit (VGP)

Brunvoll’s retractable thrusters are the product of years of experience. They have proved their worth in a variety of demanding applications, from research ships and coast guard vessels to offshore supply vessels and shuttle tankers operating in the harsh climate of the North Atlantic. They have even proved invaluable for auxiliary and emergency «take home» propulsion.

Complete system deliveries

One source - one responsibility

For optimal performance Brunvoll takes responsibility for delivering complete systems and for providing support throughout the lifetime; from design, production, installation and commissioning, through daily operation.

Ask us for a complete thruster system including:

Electric drive motor, asynchronous or Permanent Magnet type
Starter or VFD for the motor
BruCon Control, Alarm and Monitoring system
BruCon Joystick and DP

Compile your vessel from Brunvoll's product range

The wide product range of Brunvoll gives a unique configuration flexibility of integrated propulsion, manoeuvring and automation systems, see Propulsion Systems.

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