USCG Master 25-100 Ton License Practice Test

In a diesel-powered vessel, when the propulsion machinery space is protected by a fixed CO2 fire-extinguishing system, portable fire extinguishers are not required to be kept inside that space. The fixed system provides the primary means of fire suppression for that space, so there’s no regulatory need for additional portable extinguishers there. Portable extinguishers would still be needed in other spaces or in areas not covered by the fixed system, and crew must follow safety procedures (such as evacuating the space before CO2 discharge).