A 40-ton active heave winch
1st Quarter 2016
Hydraulic systems & components
Hyflo was contracted by Denith Engineering to design and build the electro-hydraulic portion of an active heave compensated (AHC) winch to provide high speed, accurate control of its 40-ton payload. This included 13 hydraulic cylinders, built in accordance with Lloyds rules. The launch and recovery system (LARS) is designed to deploy and recover a crawler, which is responsible for subsea trenching to lay power cables. These are used for off-shore wind farms and are laid up to 600 m below sea level.
The winch is driven by 10 Poclain 5000 cc motors, and is powered by a 1,5 MW power pack. The control is taken care of by two of Moog’s latest NG32 digital axis control valves. These are synced together using a CAN network to control the 3000 l/min of flow required. The valves are mounted on two 1,1 ton manifold blocks, designed and machined in-house by Hyflo.
The AHC winch is designed to keep the payload at a constant height relative to the seabed in a swell of up to 2,5 m. The Moog valves receive three important reference signals. The first is from a motion reference unit (MRU). The second and third indicate the position and tension, and are received from an encoder and load cell respectively. The key to the system is the high speed decentralised control that is directly programmed into the valves. This achieves a loop time of less than 1 ms. The Moog valves are connected to a Profibus network, which allows all the parameters and modes to be monitored and updated.
For more information contact Kribashen Padayachi, Hyflo, +27 (0)21 514 3000, [email protected], www.hyflo.co.za
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