🔍 Key Concepts

• Behavior of fuel oil in tanks when heated (e.g., flash point, auto-ignition temperature). • Fire triangle: fuel, heat, oxygen – which element can you most quickly and safely reduce in this situation? • Typical shipboard procedures for oil tank fires, including isolation and protection of tank boundaries.

💭 Think About

• Look at each option and ask: which action could make the fire worse by causing more vapors, spreading fuel, or over-pressurizing the tank? • Which control measure acts directly on the source of heat affecting the fuel oil in the tank? • In the very first moments of the fire, which control can be applied most quickly and reliably without waiting for system build‑up or full tank sealing?

✅ Before You Answer

• For each option, think: does this increase the risk of tank overpressure, fuel flow, or vapor production? • Consider what happens to a heated fuel oil tank if you suddenly seal vents while a fire is present – what does that do to pressure and structural safety? • Review your basic engine-room fire procedures: when a heated fuel tank is involved, what is normally done first to remove or reduce the heating source?