A workshop of floor area (250\, ext{m}^2\) contains three types of fire hazard. Electrical equipment occupies 20 % of the floor and has a fire‑load of (0.8\, ext{MJ/m}^2\). Flammable liquids cover 30 % of the floor with a fire‑load of (1.2\, ext{MJ/m}^2\). The remaining area is stored wood with a fire‑load of (0.5\, ext{MJ/m}^2\). The available extinguishers are: Class A (rating 9 MJ), Class B (rating 6 MJ) and Class C (rating 4 MJ). Each extinguisher can only be used for its own class. Determine the minimum number of extinguishers of each class required to safely protect the workshop.

Question

A workshop of floor area (250\,	ext{m}^2\) contains three types of fire hazard. Electrical equipment occupies 20 % of the floor and has a fire‑load of (0.8\,	ext{MJ/m}^2\). Flammable liquids cover 30 % of the floor with a fire‑load of (1.2\,	ext{MJ/m}^2\). The remaining area is stored wood with a fire‑load of (0.5\,	ext{MJ/m}^2\). The available extinguishers are: Class A (rating 9 MJ), Class B (rating 6 MJ) and Class C (rating 4 MJ). Each extinguisher can only be used for its own class. Determine the minimum number of extinguishers of each class required to safely protect the workshop.

Accepted Answer

10 Class C, 15 Class B, 7 Class A

City Guilds Model Questions Vol1 2025 Engineering Question 32

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