Veth’s first integrated L-drive propulsion system has gone into service. This L-drive is part of a diesel-electric configuration that provides propulsion and vessel power.
The first installation of an integrated L-drive is on a Damen Shipyards-built utility vessel operated by Remoy Management which completed sea trials at the end of April.
Veth supplied a compact electric propulsion solution to Volt Processor, which uses 750 kW of electric power for propulsion, positioning and driving deck machinery. Integrated L-drives are suitable for other types of hybrid-powered workboats and tugs and could be used for dynamic positioning.
A water-cooled permanent magnet motor is integrated in the slewing bearing, said Veth general sales manager Martin van der Jagt. The mounting method, alignment of the headsets and adjustments to the control box make this integrated L-drive “extremely compact” he said. “The difference in height between a traditional L-drive and the integrated L-drive is about 2 m.”
Mr van der Jagt said the integrated L-drive is more efficient in part load modes than other hybrid propulsion units because the permanent magnet motor is water cooled instead of air cooled. At 25% load, the improvement in efficiency with this motor is 5.2%. It also produces less noise than an air-cooled asynchronous motor.
Veth’s integrated L-drive is available with power ranging from 300 kW to 2,350 kW.
ZF unveils retractable thrusters and hybrid transmission
ZF Services revealed its latest propulsion range of thrusters and hybrid transmission systems for workboats in July including the ZF AT 3000 retractable thruster that can be used as an auxiliary propulsion system, for increasing speed and bollard pull or improving station keeping capabilities.
Another development for ZF Services was the ZF 3300 transmission with a power take-in (PTI) as an alternate power source. This is the latest in hybrid-ready propulsion technology from ZF Services for workboats and leisure vessels.
ZF 3300 PTI has a power range of up to 1,940 kW (2,600 hp) derived from a standard diesel engine input or a PTI power source, which means ZF 3300 PTI has the flexibility to be integrated into a wide variety of hybrid vessel propulsion solutions.
So is ZF Services’ range of gearboxes that are widely used on tug newbuildings. Turkish shipbuilder Med Marine chose ZF 5355 gearboxes with 5,500:1 reduction ratio for a new design of tugs it will be building.
Med Marine will use these gearboxes, along with Caterpillar C32 engines and 1,780 mm diameter propellers for RAscal 1800 series of twin screw tugs, after it signed an agreement to use Robert Allan designs. These 18-m tugs will have a minimum of 30 tonnes of bollard pull and will be built for towing, pushing, mooring and fire-fighting duties.