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The Double Acting Tanker (DAT) concept is that, like most vessels, it travels ahead on normal open water by taking advantage of a bulbous bow to improve its resistance characteristics. When it sails in ice, however, it travels astern using its reinforced stern hullform to break the ice. This is combined with azimuthing podded propulsion system to provide the vessel with more efficient ice breaking capability and powerful maneuverability Two double acting tankers (DAT) “ Tempera” and “ Mastera” were built by Sumitomo Heavy Industries Ltd. for the Finnish group Fortum Oil and Gas and they were delivered successfully in Aug. 2002 and January 2003 respectively. The first open sea trial of Tempera was conducted in Aug. 2002 at Sagami Bay of Japan. In addition to normal sea trial items, several speed performance tests and maneuvering tests at astern condition were investigated and compared with model tests results. Full scale ice tests of “Mastera” was conducted Feb. 2003 during the voyage between Naantalli, Finland to Primorsk, Russia. The ice breaking capacity of ballast condition and fully loaded condition were investigated by ice experts who are studying ice technology at Masa-yards Arctic Research Center (MARC). The paper intends to show the results of full scale tests for the two double acting tankers mentioned above and evaluate the results by comparing with model test results. |
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