Active heave compensation
3rd Quarter 2010
Hydraulic systems & components
Active heave compensation from Rexroth (RAHC), represented locally by the Hytec Group, enables marine crane operators to position loads accurately on the seabed. The ship’s movements are recorded and integrated into a closed loop control process, which in turn compensates for 95% of a ship’s motion with the aid of secondary controlled drives. More than 100 crane and winch systems are currently in service, safely positioning loads from 5 tons to over 250 tons on the seabed.
Recovers energy
To keep the crane load in position, the drive winds up the winch cable during a downward movement of the ship. It acts as a motor and consumes energy to perform its function. When the ship moves upwards, the drive unwinds the cable and operates as a pump in generator mode. This recovers lost energy, which is stored by the hydraulic system for the next downward motion. The system successfully recovers up to 70% of the drive’s operational energy requirements, which makes it highly energy efficient.
Precise
Rexroth claims that the RAHC system provides a number of advantages over competing products. It affords highly precise movement compensation, even in heavy seas. It is also compact and requires minimal installation space. It is highly adaptable and allows project specific functions to be easily integrated using software additions. Operating modes can be switched over with minimal disruption to workflow on ships.
Safe and reliable
Rexroth has achieved maximum safety and reliability in all standard operating modes of the RAHC system through exhaustive multistage testing and optimisation. Standard operating and safety functions of the system also include hoisting and lowering in speed control, active rope tensioning, monitored freefall mode, constant tension mode and overload protection systems.
No power limits
The modular system structure sets no power limits on the RAHC system, whether for a 5 ton winch or a 500 ton crane with hoisting and slewing. Rexroth can custom develop a RAHC solution to meet the operating requirements of any client.
For more information contact Herman van Rensburg, Hytec, +27 (0)21 551 4747, [email protected], www.hytec.co.za
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