Stability in Damaged Conditions

Category A and Category B ships constructed after the first of January, 2017, must be able to withstand flooding as a result ice impact penetrating the hull.

In order to comply with this regulation, the ice damage extents assumed are as follows:

• The longitudinal extent is 4.5% of the upper ice waterline length if centered forward of the maximum breadth on the upper ice waterline, and 1.5% of upper ice waterline length otherwise. This needs to be assumed at any longitudinal position along the ship's length.
• Measured normal to the shell over the full extent of the damage, the transverse penetration extent is 760 mm.
• The vertical extent is the lesser of 20% of the upper ice waterline draught or the longitudinal extent. It must be assumed at any vertical position between the keel and 120% of the upper ice waterline draught.

To learn more about Polar Code visit our Polar Code Online Training web page.