Damage stability calculations are
much more complicated than intact stability. Software utilizing numerical
methods is typically employed because the areas and volumes can quickly become
tedious and long to compute using other methods.
The loss of stability from flooding
may be due in part to the free surface effect. Water accumulating in the hull
usually drains to the bilges, lowering the centre of gravity and actually
decreasing (It should read as increasing, since water will add as a bottom
weight thereby increasing GM) the Meta centric height. This assumes the ship remains
stationary and upright. However, once the ship is inclined to any degree (a
wave strikes it for example), the fluid in the bilge moves to the low side.
This results in a list.
Ø Floodable Length: The floodable length at any point within the length of the ship is the
maximum portion of the length, having its center at the point which can be symmetrically flooded at the
prescribed permeability, without immersing the margin line.
Floodable
length (in short) is the length of (part
of) the ship that could be flooded without loss of the ship.
Ø Determination of Floodable length is
essential to determine
- How many watertight compartments (bulkheads) are needed
- Factor of subdivision (How many water compartments flooded without loss of
ship)
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