Fleet in Service – exploit its potential, control costs: Exchange of Propellers

By Peter Pospiech at September 17, 2013 05:15
Filed Under: Company News, drive systems

Flow-optimized propellers can reduce fuel consumption by up to ten tons per day

To improve ships manoeuvrability and energy efficiency also the propellers play a big role. Worldwide leading manufacturer of ship propellers is the Metallguss GmbH (MMG) in Waren, Germany. The company produces also propellers with six blades with a diameter of up to 9,30 meters and a weight of 97 tons for example for container ships with a load capacity of 9.400 TEUs. The propulsion power of such 286 meters long and 48.20 meters ship with a draft of 14.50 meters is of one diesel engine with an output of max 52.290 kW. With this a speed of 22.3 kn is reached.

Propellers of the "AIDAstella" have a diameter of 5.2 meters and weigh each 12.8 tons

The propeller is pretty much decisive to transfer as much as possible of the engine energy into propulsion energy. With particular large diameters and very specific blade geometry an efficiency gain of three to four percent can be reached – with following positive effect on operating costs and CO2-emission. This results in fuel savings of up to ten tons per day. Further features of the propellers are very good cavitation properties smooth running and with this a very low vibration inducement to the vessels hull. 

The change of the operating profile of existing ships because of lower speed means very often that the propeller design is not at its optimum any more. In most the cases has the existing propeller been designed for maximum speed and lowest cavitation risk. This design is not efficient any more at slow steaming. 

With an upgrade towards a high efficient propeller, which has been optimized for low speed and less cavitation risk, fuel consumption savings can be reached by 2 to 5%. Investment costs for the new propeller are reasonable because the material value of the old propeller is also taken into consideration. To exploit the full potential of a propeller upgrade an analysis of a computational fluid dynamic (CFD) is highly recommended. In addition it makes sense to exchange different engine components to improve the advantages of slow steaming.


Source / image: PPM News Service, courtesy of AIDA cruises


Comments (2) -

Thank you all for the imagination of marine propulsion.
I have a concept which may improve your performance.
Regards afloat,
Capt. Rip Hayman
New York Islands

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