MAN Diesel & Turbo’s L27/38 Propulsion Package For Trawlers

By Keith Henderson at December 29, 2011 07:18
Filed Under: Company News

According to reports from MAN Diesel & Turbo, the MAN L27/38 based propulsion package is enjoying popularity in the segment of high end Scandinavian and North Atlantic fishing vessels with several orders booked this year for trawler and purse-seine trawler applications.


Caption: Photo of the present Cattleya trawler delivered in 2006 also with an L27/38 propulsion package.
Image credit: MAN Diesel & Turbo SE

An MAN Diesel L27/38 propulsion package is again specified for the new Danish trawler Cattleya, scheduled for delivery by Karstensens Shipyard, Denmark, in October 2012 . Replacing the present Cattleya, the new ship has an LOA of 228 ft (69.6 m) and beam of 46.6 ft (14. 2 m). She is larger than her predecessor, 24 ft (7.3 m) longer, 4.6 ft (1.4 m) wider and with a gross tonnage increase from 1,337 to 1,750.

The propulsion system is designed to provide a maximum speed of 16 kn and to have a bollard pull of 68 tons. The package comprises a single 9L27/38 diesel engine rated at 3MW at 800 rpm. It is coupled to an AMG55 (Alpha Module Gear) gearbox with a 800:119 reduction driving a 13.8 ft (4.2 m) CP propeller running in a nozzle. The design of the propeller takes into account most importantly, the vessel’s predicted operational power/speed/duration profiles. The result is a compromise between high speed steaming performance and maximum pulling-power efficiency at trawling speed while at the same time suppressing cavitation and noise.    In addition, there is a bow mounted, retractable, electric powered 800 kW azimuth thruster for maneuvering, low speed propulsion and with an emergency take home capability.

The vessel uses an electrical system with floating frequency from 60 to 50 Hz and enables the shaft alternator to continue to deliver power when the engine / propeller are running at reduced speeds (with a limit of 16.7 per cent slower): thereby delivering a beneficial reduction in fuel consumption.


Caption: Drawing of the new Cattleya scheduled for delivery in October 2012.
Image credit: MAN Diesel & Turbo SE

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