Class 2 (2nd Engineer) SC&S 📅 Apr 2024

Exam Question

(a) Describe briefly the significance of the factor of sub-division. (6)

(b) A ship 120m long has a light displacement of 4000 tonne and LCG in this condition 2.5m aft of midships. (10)

The following items are then added:

Cargo 10000 tonne LCG 3.0 m forward of midships

Fuel 1500 tonne LCG 2.0 m aft of midships

Water 400 tonne LCG 8.0 m aft of midships

Stores 100 tonne LCG 10.0m forward of midships

Using the following hydrostatic data, calculate the final draughts:

Draught 8.50 8.00

Displacement (t). 16650 15350

MCTI cm 183 175

LCB from midships(m) 1.94F 2.10 F

LCF from midships (m) 1.20A 0.60F

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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