Class 4 (4th Engineer) SSEP 📅 Jan 2026

Exam Question

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

(a) Settling and service tank valves (4)

(b) Fuel transfer and supply pumps (4)

(d) State how the fire is brought under control using the facilities available outside the machinery spaces. (8)

Reference Answer

### (a) Reasons for Shutting Settling and Service Tank Valves (4 Marks)
Shutting the settling and service tank valves is a critical step in isolating the fuel source from a fire, directly addressing the 'Fuel' side of the fire triangle. This action is mandated by SOLAS regulations for all fuel tanks situated above the double bottom.
* **Elimination of Gravity Feed:** Settling and service tanks are positioned at a higher level than the machinery they serve. If the valves remain open, fuel can continuously feed the fire due to gravity, even if all pumps have been stopped. This would make extinguishment impossible and lead to an escalating fire.
* **Prevention of Fuel Spread:** A major fire can compromise the integrity of fuel piping. If tank valves are open, a pipe failure would result in a large, uncontrolled release of fuel into the machinery space, significantly increasing the fire's intensity and spreading it over a wider area.

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