Currently the largest version of 'very large' or 'Jumbo'-containerships are ships of A.P. Möller/Maersk's 'Sovereign Maersk'-class (L= 347 m, B=42,80 m, 104886 tdw, 91560 GT, 7000 TEU, 54900 kW, v=25 kn). They are powered by MAN B&W (MBD) 12 K 90 diesel engines. Strongest engines are currently two-stroke diesel engines with close to 1000 mm bore (e.g. (1) MAN B&W K 98 MC: 980 mm bore, 5,720 kW/cyl.; (2) Wärtsilä NSD RTA 96 C: 960 mm bore, 5,490 kW/cyl.; (3) Mitsubishi UEC 85 LSC: 850 mm bore, 3,898 kW/cyl.). With up to 12 cylinders in line they generate up to 70000 kW (MBD: 68640 kW; WNSD: 65880 kW; M-UEC: 46776 kW). As MAN B&W (MBD) builds the strongest two-stroke diesel engine, MBD shall serve as an example here. Power requirements for the fastest of the current (7000 TEU) and even future vessels (8000 TEU to 12000 TEU) is beyond what can be covered today even by MBD's largest unit, the 12 K 98 MC developing 68640 kW (93360 BHP) at 94 rpm, but engines with more cylinders are feasible. 14 and 16 cylinder versions can be built, thereby expanding the power range up to some 91520 kW. Such engines would be available as both traditional in-line and V-type engines. The expected dimensions of a 12000 TEU ship, based an 22 Containers abreast, could be: L=385 m, B=55 m, D= 13,50 m, displacement=175000 m3. To generate the required propulsion thrust a vessel with two propellers should preferably be designed as a twin-skeg hull, since this solution will provide the best overall propulsion efficiency according to available theory on the subject. Outlines with K 98 MC and K 90 MC type engines installed in a twin-skeg hull are shown in the enclosed figures. The expected specified MCR (Maximum Continuous Rating) and engine types for the twin-skeg hull with two propellers are based on the assumption that the expected advantage in propulsion performance can be utilised to its full extent. The first of a series of five large Post-Panamax container vessels with a capacity of about 6300 TEU each, ordered by Costamare of Greece with Hyundai Heavy Industries will enter service in May 2000. The newbuilding will be powered by MBD's so far largest bore engine, the 10 K 98 MC-C developing 57000 kW (5700 kW/cyl.). The first of these 10 cylinder 980 mm bore engines has just passed successful testbed trials at Hyundai Heavy Industries.


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    Titel :

    Post-Panamax containership propulsion


    Weitere Titelangaben:

    Sind Einzelmotor-Antriebe für zukünftige Container-Schiffe vom Typ Post-Panamax ausreichend?


    Erschienen in:

    Erscheinungsdatum :

    2000


    Format / Umfang :

    3 Seiten, 3 Bilder, 3 Tabellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch






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