Class 2 (2nd Engineer) SC&S 📅 Sep 2023

Exam Question

(a) With respect to Buoyancy of a vessel

What do you understand by reserve buoyancy what happen if the lost buoyancy is greater than the reserve buoyancy?

(b) A triangular bulkhead ty 7 m wide at the top and has a vertical depth of B m. Calculate the load on the bulkhead and the position of centre of pressure if the bulkhead is flooded with sea water on only side:(10)

(i) To the top edge

(ii) With 4 m head to the top edge.

Reference Answer

(a) Reserve Buoyancy
Reserve buoyancy is the watertight volume above the waterline of a vessel. It represents the potential buoyancy that can be utilised to keep the ship afloat when additional weight is added or if some buoyancy is lost due to damage (e.g., bilging).
When a mass is added to the ship or buoyancy is lost (e.g., due to flooding of a compartment), the reserve buoyancy is converted into active buoyancy by an increase in draught .
If the lost buoyancy (due to flooding or damage) is greater than the reserve buoyancy , the vessel will no longer have sufficient buoyant force to counteract its weight, causing it to sink .

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