Class notation for vessels breaking ice of 1.0 m level thickness in polar areas.
The notation ensures that the vessel has sufficient strength and equipment to continuously operate in the specified ice conditions of the Arctic, sub-Arctic and/or Antarctic regions without icebreaker assistance.
Owners get a vessel which can operate unassisted in the ice-infested waters of the sub-Arctic, Arctic and/or Antarctic regions.
The POLAR rules are intended for vessels operating unassisted in multi-year winter ice with floes and glacial inclusions as found in the Arctic, sub-Arctic and/or Antarctic regions. Occasional ramming is anticipated. The rules include the DAT (-XºC) notation with requirements regarding material quality in selected areas. The DAT (-XºC) notation (Design Ambient Temperature) ensures adequate material properties at low temperatures to avoid brittle fractures.
The following matters are covered by the classification:
Materials in structures exposed to low ambient air temperatures
Subdivision, intact and damage stability
Hull girder longitudinal and transverse strength
Local hull structures exposed to ice loads
Rudders and steering gears
Propellers and propulsion machinery
Sea suctions for cooling water
Air starting systems
Additional requirements regarding rudder, pods and hull appendages with respect to local dimensions and the effect of direct ice loads
Newbuilding plan approval and a site survey in accordance with relevant parts of the Rules. The approval is carried out at responsible approval centre. The site survey is carried out at the building yard and its suppliers' premises.