Class 4 (4th Engineer) SC&S 📅 Jun 2024

Exam Question

(a) What is Freeboard of a Ship? Why oil tankers have less freeboard? (6)

(b) A box barge 25 m long and 4 m wide floats in fresh water at a draught of 1.2 m and has an empty mid length compartment 5m long. The bottom of the barge is lined with teak (rd 0.805) 120mm thick. Afer grounding all the teak is torn off and the centre compartment laid open to the sea. Calculate the final draught. (10)

Reference Answer

### (a) Freeboard and Reduced Freeboard for Oil Tankers (6 Marks)
#### Definition of Freeboard
Freeboard is the vertical distance measured from the waterline to the upper surface of the freeboard deck at the side of the ship, amidships. The freeboard deck is normally the uppermost complete deck exposed to weather and sea, which has permanent means of closing all openings in its weather parts.
* **Purpose:** Freeboard is a critical measure of a ship's **reserve buoyancy**. Reserve buoyancy is the volume of the enclosed and watertight part of the ship above the waterline. It provides a safety margin against flooding and ensures the vessel can withstand the effects of heavy seas without being swamped.

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