Class 4 (4th Engineer) SSEP 📅 Oct 2022

Exam Question

State why the following equipment requires shut down during a major fire which has necessitated the evacuation of the machinery spaces:

(a) Settling and service tank valves. (2)

(b) Fuel transfer and supply pumps. (2)

(e) Mechanical and natural ventilation (2)

(d) State how the fire is brought under control using the facilities, available outside the machinery spaces. (14)

Reference Answer

### (a) Settling and Service Tank Valves (2 Marks)
The primary reason for shutting settling and service tank valves during a major fire is to **isolate the fuel source**. This action is a critical step in removing the 'Fuel' side of the fire triangle.
* **Function**: These tanks contain large quantities of readily flammable fuel (HFO/MGO/LFO). Quick Closing Valves (QCVs) are fitted to the outlets of these tanks.
* **Operation**: QCVs are designed to be operated remotely from a safe location outside the machinery space, such as the fire control station or a cabinet in the ship's alleyway. This allows for immediate isolation without requiring personnel to enter the hazardous area.

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