XT Hydraulic Power Unit (HPU)

The XT™ hydraulic power unit (HPU) is specifically designed to extend and retract the foil on the XT stabilizer fin (link to the XT Stabilizer Fin page). These functions are controlled via the XT HPU instead of the stabilizer main hydraulic system to:

  • isolate the submerged cylinder hydraulics from the main hydraulic system, and
  • allow the use of environmentally friendly oil.

The XT fin is designed with a retractable foil, which is kept retracted for underway operations and extends out of the XT fin body for Zero Speed operations. To control these activities, the XT HPU is a constant pressure system, running as required to maintain the pressure required to keep the foil in the desired position.

The XT HPU is compact. Within its small reservoir, it houses a submerged hydraulic pump, as well as three levels of filtration. Control manifolds on the face of the reservoir contain necessary valves to control the XT cylinder position, over-ride and troubleshooting mechanisms, and manual control functionality in case of an emergency.

Control of the XT HPU hydraulics is provided by a PLC-based electrical control box.   The control box is fitted with a touchscreen display providing real-time foil position indication, hydraulic system status indication, local power unit and foil operation, and alarms.

Ethernet connection at the XT HPU allows communication and indication of foil position, hydraulic system status, and alarms on other system controls, for example the main stabilizer control in the bridge. Many of these indicators are also provided for indication on the ship’s central alarm and monitoring system.

The control box and reservoir assembly are typically supplied mounted to a common panel and pre-wired, for ease of installation and start-up. However, the control box and reservoir can be removed from the panel and installed separately for better arrangement flexibility.

Quantum XT™ (Extendable Fin) systems utilize hydraulic cylinders to extend the foil contained within the body of the stabilizer fin. Each fin’s extend-retract cylinder is powered by the single onboard XT™ Hydraulic Power Unit (HPU).

Quantum designed the XT™ HPU to be independent of the main stabilizer hydraulic system to enable the use of eco-friendly hydraulic fluid in the submerged XT™ extend-retract cylinder.The XT™ HPU panel holds the fluid reservoir which contains an immersed hydraulic pump, and the electrical control box. The tank and control box can be removed from the panel for added installation flexibility. The unit offers visual display of foil position and numerous feedback and gauging points.





xt power unit

XT Hydraulic Power Unit