Two anchor handling tug supply (AHTS) vessels under construction in Turkey will be equipped with ice-strengthened controllable-pitch (CP) propellers and transverse thrusters specially designed for ice-infested operations in the Caspian Sea
Germany’s Schottel reported it has been awarded a contract to supply eight propulsion units to the Turkish Atlas Shipyard for two AHTS vessels being built for Russian company Polar LLC & Polus LLC, affiliates of Ark Shipping & Adamant. Both vessels are set to be completed by the end of 2021.
Designed by V Denge Technology, the two AHTS vessels Polar and Polus will each be driven by three 1,740 kW Schottel SCP 65 4-XSG CP propellers. These propulsion systems, featuring a propeller diameter of 2.1 m and an optimised hub for full feathering mode, are powered by diesel engines. The new vessels will be able to achieve a free sailing speed of 12 knots, with a bollard pull of 70 tonnes.
In addition to the Schottel CP propeller systems, these shallow-water AHTS vessels will be fitted with 400-kW Schottel transverse thruster (STT 1 FP) bow thrusters, providing full dynamic positioning to DP 1 standards.
To withstand the harsh conditions of the Caspian Sea, the CP propellers will be ice-strengthened according to Finnish-Swedish Ice Class 1A Super. With the capability of operating in a minimum draught of 2.5 m, the CP propellers will allow operations in shallower parts of the Caspian Sea.
With a length of 73.3 m and beam of 16.9 m, the AHTS vessels will perform haul, lay, retrieve and lift the anchors of semi-submersible drilling platforms or pipe-laying vessels. Furthermore, they will be capable of towing drilling rigs, lighters, other vessels and floating facilities. They are also intended to serve as emergency response and rescue vessels and supply transports.
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