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?
While the passive heave compensator relies on external forces to excite the motion of the compensator, the active heave compensator senses and predicts the motions to be compensated and applies stored energy to actively induce the required compensating motion.
This principle can be utilized in all scenarios where there are relative heave motions between the crane hook and the foundation being lifted to or from. The load is kept in position regardless of vessel motion, and makes it possible to position loads accurately, even in rough weather.
Due to the basic PHC functionality of the Cranemaster, the load is initially balanced. This effectively reduces the required energy for the active compensation. This also provides an intrinsic fail-safe state for the system, by reverting to passive compensation in an instant.
In addition to the active heave compensation, Cranemaster AHC offers the ability to control the tension level, enabling gradual tensioning and load transfer during lift-off and landing.
Paired with the already well proven Cranemaster Quick Lift functionality, this provides an optimal solution for demanding transfer lifts, where reduction of dynamic loads and avoidance of re-entry is equally important.
- Feeder of WTG components
In order to speed up the installation of offshore wind farms, feeder barges or vessels transports components to the installation vessel. 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, improves the DAF values significantly providing a safer lift.
- Backloading / vessel to vessel transfer
When transferring goods between vessels, the landing impact can cause excessive shock loads to the object to be lifted. A Cranemaster in-line active heave unit reduces 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 is 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 ensures 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 compensates for these motions.
- Offshore Maintenance
Doing repair from a floating vessel incorporates motions. A Cranemaster contributes to reduce such motions making repair offshore possible and avoid expensive transportation to shore.
Reduces of heave motions and velocities by up to 95%.
Hook-mounted, plug and play, compact and compatible with vessel’s existing lifting equipment.
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. Rent for short or long period.
- 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.
Cranemaster offers a well proven technology. Strong in-house lifting engineering expertise through more than 40 years of operation.