Liebherr Subsea Cranes - Manual (Page 14)

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Subsea offshore cranes
For efficient subsea operations Liebherr offers cranes with Active Heave Compensation (AHC) and Subsea Winch.
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The revolutionary Active Heave Compensation (AHC) System
and the Subsea Winch from Liebherr have been designed for
subsea load handling from a vessel to the seabed and load
lifting from the seabed to the vessel, as well as for handling
loads under water.
The completely new design of the Subsea Winch allows our
cranes to lift up to 260 tonnes in subsea mode and up to
300 tonnes above the water surface as heavy-lift operation.
Loads can be handled in waters with a depth of up to 3,400 m.
With the innovative design concept of the winch unit (including
the support) a completely new idea is provided, which si-
gnificantly extends the lifetime of the main wire rope. In
addition to the reduced life cycle costs, the main winch can be
easily adapted for the customer's site specific use.
Liebherr's AHC system is completely integrated in the well-
proven Liebherr Litronic
® control system. The vessel's motion
is recognised using a completely new, in-house designed
MRU (Motion Reference Unit), which compensates the motion
with the appropriate winch rotation.
Along with the newly developed AHC system and the Subsea
Winch, Liebherr has designed a "Knuckle Boom" crane to
meet the requirements of the market.
It is based on Liebherr's proven
electro-hydraulic drive
system which is controlled by the Litronic ® system
allowing smooth operation under all working conditions.
Booms are available with outreaches between 35 m and 50 m.