Active heave compensation

Offshore operations at high sea as well as subsea lifting are made difficult by wave-related ship movements. Despite these conditions, controlled handling of loads is indispensable for safe operation.

Basic principle of Liebherr Heavetronic with a RL-K 7500.

Basic principle of Liebherr Heavetronic with a RL-K 7500.

Liebherr ram luffing knuckle boom crane RL-K 7500 with Heavetronic.

The active heave compensation system (Heavetronic) was specially developed by Liebherr for deep sea operations. The system is based on a motion reference unit (MRU) for registration and evaluation of the current wave movements that affect the ship and thereby the crane. Based on the measurements of these movements, a prognosis of the vertical movement of the crane jib point is carried out. The winch system is moved proactively and fully automatically to compensate for this.

Heavetronic is fully integrated in the Liebherr Litronic control system and supports not only safe lifting but also safe lowering of loads. The output required for compensation is made available by Liebherr's patented Pactronic hybrid drive.

This system is enhanced by the company's own-developed deep sea winch with a special cable reel mechanism. Winding and unwinding is supported by this system, which in turn prolongs the service life of the cable.

Advantages at a glance

  • Improvement in efficiency of subsea lifting
  • Controlled and safe handling of loads
  • Minimisation of dynamic loads on the crane
  • Complete integration in the Liebherr Litronic control system
  • Reduction of energy requirement by use of Liebherr Pactronic