Georgiy Sedov (1998 icebreaker)
Georgiy Sedov () is an icebreaking platform supply vessel operated by Rosmorport in the Sea of Azov. She was built by Kværner Masa-Yards in Helsinki, Finland, in 1998 as Antarcticaborg () for Wagenborg Kazakhstan to be used in the Caspian Sea.

Antarcticaborg and her sister ship, Arcticaborg, were the first full developments of the double acting ship concept and among the first icebreakers equipped with Azipod propulsion units.

Design

General characteristics 

The 2,043-ton Georgiy Sedov is  long and has a beam of . Designed to operate in shallow waters with a maximum depth of , her maximum operating draught is only . Furthermore, her main dimensions were limited by the Russian inland waterways which had to be used to transport the ships to the Caspian Sea. The gross tonnage of Georgiy Sedov is 1,453, net tonnage 454, and deadweight tonnage 675 tons. The ship is served by a crew of 12 and has accommodation for 20. 

Built as a supply ship, Georgiy Sedov is equipped to carry a wide range of goods needed on the offshore platform. The ship has a  open aft decks for dry cargo and a cargo hold which has a hatch large enough the fit a twenty-foot container. For powderized goods such as cement and barite, Georgiy Sedov has five storage silos with a combined capacity of . Furthermore, the ship has cargo tanks for  of liquid drilling mud,  of fuel, and  of fresh water. On her way back from the platform, Georgiy Sedov was designed to carry  of sewage and wastewater. It is also equipped for firefighting, pollution control and rescue operations, and has towing and anchor handling equipment.

Georgiy Sedov was initially classified by Russian Maritime Register of Shipping (RMRS) with ice class UL, equivalent to the highest Finnish-Swedish ice class, 1A Super. However, the actual level of ice strengthening far exceeds the requirements of the ice class notations. , her ice class is Arc5 according to the current RMRS system.

Power and propulsion 

Georgiy Sedov has a diesel-electric powertrain with two six-cylinder Wärtsilä 6L26 4-stroke medium-speed diesel engines, each with a maximum continuous rating of , driving van Kaick DGS generators rated 2,250 kVA at 690 V. According to the power plant principle, the main generators in the forward engine room provide electrical power for all shipboard consumers, including propulsion. For emergency and harbour use, the ship also has Valmet 612 diesel engines, rated at , coupled to 163 kVA alternators. Georgiy Sedov is propelled by two ABB Azipod VI1100A electric azimuth thrusters rated at 1,620 kW each. When built, Georgiy Sedov was among the first icebreakers fitted with Azipod propulsion units that allow the ship to operate astern in heavy ice conditions with excellent maneuverability. In addition the ship has one 150 kW bow thruster for harbour operations.

Georgiy Sedov is capable of breaking level ice up to  thick at  when moving ahead. However, the bow is designed primarily with good seakeeping and open water characteristics in mind, and in heavy ice conditions the ship is turned around and operated stern first. In such way, her icebreaking capability increases to  of level ice. More importantly, by allowing the Azipod units to mill and crush the ice, Georgiy Sedov is able to penetrate ice ridges that are thicker than the draught of the ship and sometimes reach the seabed without having to rely on backing and ramming. Her service speed in open water is  and bollard pull 32 tons.

In addition to the four Azipod units installed on Georgiy Sedov and her sister ship, ABB delivered a fifth spare unit, which allowed the company to carry out a complete overhaul for all propulsors, one at a time, without having to dock the ships for extended periods.

Career

Antarcticaborg (1998–2019) 

Arcticaborg and Antarcticaborg were ordered from Kværner Masa-Yards Helsinki New Shipyard in December 1997 following extensive research and model testing at the company's Arctic Technology Centre, nowadays known as Aker Arctic. Constructed in the covered dry dock at the same time, both ships were delivered to Wagenborg Kazakhstan BV, a subsidiary of the Dutch shipping company , within a week in October 1998 and sailed from Finland through the Mediterranean to the Black Sea and finally to the Caspian Sea through rivers Don and Volga. The final ice trials were conducted in the following spring. The ships were placed under long-term charter by Offshore Kazakhstan International Operating Company (OKIOC), a consortium which includes Shell. Although initially classified by Bureau Veritas and flying the Dutch flag, the ships were reclassified by the Russian Maritime Register of Shipping and their port of registry was changed to Aktau, Kazakhstan, shortly after delivery.

Following the discovery of the Kashagan Field in July 2000, Arcticaborg and Antarcticaborg began operating for Agip KCO in the Northern Caspian Sea where the water depth is only  and the ice conditions are particularly difficult. In 2000, dedicated ice-strengthened barges, pushed or towed by the icebreaking supply ships, were developed and constructed to allow uninterrupted cargo transportation to and from the platforms year round.

Until 2019, Antarcticaborg was laid up as her contract had concluded. Her sister ship, Arcticaborg was transferred to Canada in 2017.

Georgiy Sedov (2019–) 

In 2019, the Russian state-owned company that manages the country's port infrastructure and operate its fleet of diesel-powered icebreakers, Rosmorport, acquired Antarcticaborg and renamed her Georgiy Sedov. The vessel will be used for icebreaking in the Sea of Azov.

References 

1998 ships
Double acting ships
Ships built in Helsinki
Icebreakers of Kazakhstan
Icebreakers of Russia