I/B “Polaris”

I/B “Polaris” is Finlands most powerful icebreaker to date.

Arctech Helsinki Shipyard is building a new icebreaker for the Finnish Transport Agency. I/B “Polaris” features the highest technology and has been designed especially for the demanding icebreaking operations in the Baltic Sea. The icebreaker will be delivered to The Finnish Transport Agency shortly.

I/B “Polaris” is the most environmentally friendly diesel-electric icebreaker ever built. She uses both low Sulphur diesel and LNG as fuel, which significantly reduces emissions. The special hull form and propulsion arrangement will minimize ice resistance and maximize the icebreaking capacity of the vessel. “Polaris” is based on the Aker ARC 130 concept developed for the Finnish Transport Agency by Aker Arctic Technology Inc. in co-operation with ILS Ltd. Upon completion FTA will sell “Polaris” to Arctia Icebreaking Oy, a subsidiary of state-owned Arctia Shipping, who manages all icebreaking operations in Finland. Ice model testing of the vessel was carried out at Aker Arctics ice laboratory.

The vessel will be able to move continuously through about 1.6 m thick level ice, to break a 25 meter wide channel in 1.2 meter thick ice at speed of 6 knots, as well as to reach 9-11 knots of average assistance speed in the Baltic Sea. In open water the service speed will be minimum 16 knots.

The main purpose for the vessel is icebreaking. The icebreaker will independently be able to perform oil spill response operations and emergency towing under demanding conditions at open sea both in winter and summer, and will therefore operate all year round to ensure safe seaborne transports in the Baltic Sea. The oil recovery equipment is supplied by Lamor enabling “Polaris” to collect 200 m3 oil per hour in extreme weather and ice conditions. The vessel is able to operate in temperatures as cold as -30°С.

I/B “Polaris” will fulfill the international IMO Tier III emission standards, and the special requirements for sulphur emissions in the Baltic Sea. She has been designed according to the zero emission principle, which means that no waste or polluting substance will be discharged in the sea. All solid and liquid waste will be stored on board and unloaded ashore. The double hull arrangement protects all the vital tanks on board. I/B “Polaris” is built to Lloyds Register EMEA and is designed for 50 years of service life.

Machinery

The icebreaker will be powered by both diesel and LNG, i.e. liquefied natural gas, which reduces both emissions and fuel costs. I/B “Polaris” is the first LNG-powered icebreaker in the world. Her 21 MW power station consists of a combination of main engines with differing capacities, which enables optimization of the engine load at variable operation conditions. The three azimuthing propulsors will enhance the manoeuvrability and icebreaking performance. The DP system is Navis NavDP4000. On board there is a DP0 system capable of keeping position using the three Azipods. Installed power is 21 MW with 19 MW for propulsion.

I/B “Polaris” diesel-electric power plant includes two nine-cylinder Wärtsilä 9L34DF (rated 4,500 kW each) and two 12-cylinder Wärtsilä 12V34DF (rated 6,000 kW each) four-stroke medium speed dual fuel gensets, as well as an additional eight-cylinder Wärtsilä 8L20DF auxiliary engine (rated 1,168 kW). Combined power output is more than 22 megawatts.

She also features a unique propulsion system; three electrically driven ice strengthened ABB Azipod units, two at the stern (6,500 kW each), and one at the bow (6,000 kW), which combine for 19 megawatts, making “Polaris” Finlands most powerful icebreaker to date.

The two stern Azipods.
The two stern Azipods.

“Polaris” will be powered by Wärtsilä’s dual-fuel engines capable of operating on both liquefied natural gas (LNG) and low sulphur diesel fuel. Wärtsilä’s industry leading track record in dual-fuel engine technology and the impressive power output per cylinder of the Wärtsilä engines was a crucial factor in the award of the contract. Additionally Wärtsilä has five years maintenance agreement for all engines & generators including spare parts, remote online support, CBM monitoring & training services.

The LNG system consist of 2 x 1970 kg/h tanks from Cryo AB. It was Scandinavian liquefied natural gas (LNG) provider Skangas that made the first delivery of LNG to “Polaris”. The vessel was bunkered from two LNG road tankers at Helsinkis Vuosaari Harbour on June 18-19, before her first sea trials on LNG began. Once Finlands first LNG terminal opens “Polaris” can also be bunkered directly at the terminal. Road tankers can supply LNG at ports around the country.

“Polaris”s two vertical LNG tanks combine for a total volume of 800 cubic meters, enabling 10 days autonomy in typical winter conditions. Another 20 days autonomy is added via a combined 2,500 cubic meters capacity for fuel oil.

Vessel data

Loa ……………………………………… 110,00 m

B dwl ……………………………………….. 24,00 m

T dwl ……………………………………….. 8,00 m

DWT …………………………………………. 3000

Speed ………………………………………. 17 kn

Bollard pull …………………………. 185 t

IMO ……………………. 9734161

DEL