Cranemaster AHC

Cranemaster´s active heave technology offers the best of two worlds, combining well proven passive heave compensation technology for balancing the load, with additional active tension regulation, precise motion control and state-of-the art power management. The result is a hook mounted, energy efficient and self-sustained and fail-safe system, for enabling AHC functionality on demand.

What is active heave compensation?

Operates continuously based on measured motion received from Motion Reference Unit(s) (MRU).​ The MRU track the vertical movements of the ship, and the Cranemaster AHC, with external power, strokes in order to compensate the boom tip motion and stabilize the load.

When the ship moves upwards, the piston extends and when it comes down again, the piston retracts. ​​The load is balanced by PHC functionality effectively reducing the required energy.

​Typical Applications

• Feeder of WTG components
  In order to speed up ​the installation of offshore wind farms, components can be feeder to the installation vessel by feeder barges or vessels. During the lift off from the feeder barge, DAF values can exceed the allowable levels either on the crane or the components. A Cranemaster in-line active heave compensation (AHC) unit, can improve the DAF values significantly providing a safer lift.
  
• Backloading​ / vessel to vessel transfer
  When transfering goods between vessels, the landing impact can cause excessive shock loads to the object to be lifted. A Cranemaster in-line active heave unit can reduce such shock loads.
  
• TP installation ​from floating vessel
  By using a Cranemaster in-line active Heave unit, the landing impact the Transition Piece of a wind turbine generator foundation can be made much softer.
  
• Light Subsea structures (Xmas trees, spools, etc.)
  Due to the limited drag area of certain subsea structures, an in-line Active Heave Cranemaster can ensure a low landing speed on the seabed.​​
  
• Cranes at quay side where vessel heave is an issue
  In order to handle heave or tide motions ​at the quay side, a Cranemaster active heave unit can be used to compensate for these motions.
  
• Offshore Maintenance
  Doing repair from a floating vessel incorporates motions. A Cranemaster can contribute to reduce such motions making repair offshore possible and avoid expensive transportation to shore.

​Key Features

• Powerful
  Reduces of heave motions and velocities by up to 95%.
  
• Versatile
  Hook-mounted, plug and play, compact and compatible with vessel’s existing lifting equipment.
  
• Economical
  Reduction of your TCO: low investment costs through a renting option compared to other alternatives. Better utilization of vessels without AHC. Less tear on wire compared to cranes with AHC. Can be rented for short or longer periods.

• Energy efficient
  Low power consumption because of contribution from PHC technology.​
  
• Fail safe
  In case of a power failure, the system can continue to operate with PHC functionality.​
  
• Reliable
  Cranemaster is well proven technology. Strong in-house lifting engineering expertise through more than 40 years of operation.