Page 62: of Maritime Reporter Magazine (December 1998)

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GREAT SHIPS OF 1998

Kvaerner's Arcticaborg (Continued from page 48)

BP, Statoil, AGIP, Total, Mobil BG and

Kazakhstancaspiyshelf. In keeping with the double-acting idea, and given the par- ticular navigating characteristics con- ferred by podded propulsors, the vessels will run stern-first in heavy ice conditions, and sail in conventional, forward-going mode in light ice or open water. Running astern in thick ice, as demonstrated by model tests at KMY's Arctic Technology

Center in Helsinki, and as long proven by large icebreakers in the northern Bothnian

Gulf and the Arctic, brings about a sub- stantial reduction in ice resistance.

The design of the Wagenborg vessels has been specially developed to facilitate stern- wards operation through level ice of 3.3 ft. (lm) thickness and also ice ridges, as encountered in the northern Caspian. At the same time, it ensures more hydrody- namically-efficient open-water transits than typically obtained with conventional icebreakers.

Arcticaborg is fitted with two electric azimuthing Azipod units, offering very high icebreaking performance relative to the 1,620-kW unit powers involved. The machinery room is located well forward, immediately below the stacks, occupied by two 1,950-kW engines of Wartsila 6L26 type driving 2,250-kVA van Kaick main generators delivering electrical energy into a common bus bar.

The AC propeller motors housed in the steerable pods aft are fed by inverter-type frequency converters.

Anticipated free running speed is in excess of 13 knots, and maneuverability is further enhanced by the adoption of a elec- trically-driven bow thruster. Built to

Bureau Veritas' requirements for class I 3/3

E notation and to Finnish-Swedish rules governing Ice Class 1A certification,

Arcticaborg is equipped with special tow- ing gear to enable her to function as an assistance icebreaker, if required. The pow- ering arrangements confer a bollard pull capacity of about 32-tons.

For her mainstream offshore supply role, the compact, 675-dwt vessel has a 350-sq.-m. open deck area aft for trans- porting gear and equipment, plus silos and tanks under-deck for a range of consum- ables and materials required on the plat- forms. Arcticaborg, as with second-of-class

Antarcticaborg, has also been installed with firefighting equipment for a standby role, since the vessels are the only supply ships able to maintain operations in the worst conditions experienced in the area.

The transit from the Finnish yard of build in the Gulf of Finland to the Caspian Sea, the world's largest inland sea, was made by way of the Volga-Don waterway system.

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