The Azistern 3270 DE design harbour tug has a larger working deck to facilitate its offshore role.


optimised low-resistance hullform, savings of around 15% can be made when compared to a conventional tug hullform.


Energy effi cient propulsion The


fully diesel-electric propulsion


arrangement of the Azistern 3270 tug will be more energy effi cient than traditional diesel direct drive, removing the need for hydraulic transmission in the operation of deck machinery, such as winches, also translating into lower fuel consumption. According to van der Zwaluw, an electric motor can operate at 95% effi ciency while hydraulic transmission runs with 55-60% effi ciency. T e 32m loa tug will be powered by three


Publication: Issue:


large main engine gensets driving electric motors mounted over azimuthing propellers aft and a Voith in-line thruster forward.


Ship & Boat International January 2012


Additionally, van der Zwaluw explains that a high working load is kept on only one engine to help reduce emissions. “T e power required to produce the maximum 70tonne bollard pull is 4500kW, but only 10% of this power is required to take the tug from A-B. During operations, only one engine or the


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Featuring:


battery will be used for 90-95% of the time, while running all three gensets at the same time will only be necessary for around 5% of the time. For a conventional tug, both main engines are running 2000kW at very low load for 95% of the time, resulting in relatively high emissions.” SBI


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Ÿ Tugs Ÿ CAD/CAM Ÿ Fire safety Ÿ Diesel-electric propuls Ÿ Asia


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Ship & Boat International January/February 2012 Authorization 27


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