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. | Preparation for loading of the RL-K 7500 subsea crane at the pier of Liebherr factory © Liebherr |
The Liebherr RL-K 7500 subsea crane
Jan. 20, 2015 + + + Last September the test bed in Rostock was The new subsea crane with knuckle boom represents a convenient solution for subsea operations. Together with the crane’s prototype, the above mentioned RL-K 7500 is already the fourth model to be completed. It features impressive technical figures, being able to lift up to 300 t in the air and handle loads down to a water depth of 3,600 m. The maximum rope diameter is 82 mm, the maximum overturning moment of the crane is 75.000 kNm.
Depending on customers’
specifications, the boom configuration allows for working radii of up
to 50 m. One vital advantage of the crane’s knuckle boom is that loads
can be lowered to the water surface with a short rope length between
crane boom head and water line. Furthermore, the crane is equipped with
a number of state-of-the-art hydraulic, electric and electronic
features and functions, some of which were submitted for patent by
Based on
sophisticated Motion Reference Units (MRUs), i.e. sensors designed inhouse
to recognise and predict the vessel’s motion, the AHC system compensates
this movement. In order to meet the high power demands of the AHC the
innovative hydraulic hybrid drive system Pactronic®, originally
developed for Liebherr mobile harbour cranes, was specially adapted for
subsea applications. Pactronic® is characterized by an additional
energy storage device. A hydraulic accumulator supplements the fluid
pump in delivering power to the system. It serves as a pressure
Energy is stored in this compressed gas to be released upon demand. Innovative winch technology
In
order to ensure optimised rope guidance, the crane has a patented
horizontal winch shifting system. It guarantees the ideal fleet angle
of the rope under all load conditions in both hoisting and lowering
operations. Easy adjustment to customer requirements regarding load and water depth can be made by exchanging the lebus shells and by adapting the width of the winch to the 3 / 3 actual rope diameter. Consequently, the customer is not obliged to change the complete hoisting winch.
With the RL-K 7500
Liebherr offers an innovative crane concept for subsea
Source: Anne Siebke, Marketing Manager Offshore
Cranes
See also:
e-news-Liebherr-Single-Lift-RL-K-7500-subse-crane.htm
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