Class 2 (2nd Engineer) SC&S 📅 Feb 2019

Exam Question

With reference to subdivisional stability:

(a) Describe briefly the significance of the factor of subdivision. (6)

(b) A ship of 8000t displacement floats upright in sea water, with KG = 7.6m, GM = 0.5m. A tank, whose Kg is 0.6m above the keel and 3.5m from the center line contains 100 t of water ballast. Neglecting the free surface effect, calculate the angle which the ship will heel, when the ballast water is pumped out. (10)

Reference Answer

(a) Factor of Subdivision
The factor of subdivision introduces a safety measure by reducing the size of the compartments to limit the effects of flooding. It ensures that the ship's draft or trim has less chance of touching the margin line during flooding or heeling.
Permissible Length Formula:
$$Permissible\:length=\frac{Floodable\:length}{Factor\:of\:Subdivision}$$

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