FEATURE SPONSOR
RESEARCH & DEVELOPMENT
HYDRAULIC ACCUMULATORS Hydraulic accumulators effectively store energy in a nitrogen filled bladder within a steel shell. When fluid under pressure fills the accumulator it compresses the gas in the bladder and when the pressure in the system falls the oil from the accumulator is available to provide pressure and high flow rates back into the system. They could be considered as a very large hydraulic spring and follows the basic Boyles law (P1. V1=P2.V2)
Applications such as knuckle boom cranes and ROV deployment systems are ideal for accumulators as they are subjected to large flows at high speeds, generating significant amounts of energy that can be stored in the accumulator. When required, the accumulator releases the stored energy back in to the hydraulic system resulting in substantial energy savings and an increased system lifespan.
An accumulator is most effective when integrated with a secondary-controlled drive. Normal active heave systems are controlled via the pump or motor and can only react to energy, not recover it. A secondary-controlled drive performs as both a motor and pump, directly on the cranes winch, which results in a compact, accurate and dynamic response system, able to compensate up to 95% of the vessels movement.
As the operation of support vessels occurs in a wave state, the vessel is moving up and down, creating energy during the upward motion of the vessel. This energy is absorbed by the hydraulic accumulators and then fed back into the hydraulic system during the vessel’s next downward motion, essentially working as a hydraulic spring. Through this process, the drive system recovers up to 75% of the energy, significantly reducing necessary installed power.
DRIVING OUT COST Energy consumption remains a concern for machinery operators, meaning energy recovery systems where possible are of great interest and active heave systems present one of the best opportunities for energy recovery.
Active heave compensation integrated with secondary-controlled winch drives and accumulators have been developed by Bosch Rexroth to facilitate load placement on the ocean floor in all weather conditions. Dynamic, powerful drive systems play a decisive role in achieving a good compensation factor.
With up to 95 per cent movement compensation and up to 75% energy savings available, Bosch Rexroth secondary-controlled winch drives integrated is a sure and effective way of reducing energy consumption and costs.
Steve Smith Marine and Offshore Sector Manager Bosch Rexroth
Click to view more info = Click to view video 1 = Click to view video 2
www.windenergynetwork.co.uk
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