Stability in Intact Conditions

When a ship is operating in areas or during periods of time that ice accretion is expected, an icing allowance is made in stability calculations. The icing allowance is determined as follows:

• 30 kg/m² on exposed weather decks and gangways
• 7.5kg/m² of the projected lateral area above the water plane on each side of the ship
• Assessing the projected lateral area of discontinuous surfaces (such as rail, sundry booms, and other small objects) and computing by increasing the total projected area of continuous surfaces by 5% and the static moments of the area by 10%

When ice accretion is likely to occur, ships must be designed to minimize the accretion and equipped with the ability to remove the ice. Information regarding the ice allowance and the calculations used for determining stability must also be made available in the PWOM. Ice accretion must always be monitored and steps taken to make sure that it does not exceed the values determined.

When ice accretion is likely to occur, the design of the ship should both minimize the accretion and equip it with the ability to remove the ice. The PWOM must include information regarding the ice allowance and the calculations used for determining stability. Operators must monitor ice accretion, taking appropriate steps to ensure that it does not exceed the determined values.

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