FE Extinguisher Components & Operation Flashcards

Which type of fire extinguisher uses a separate cartridge of CO2 or nitrogen to expel the agent?

Answer: Cartridge-operated type

Cartridge-operated extinguishers have a separate gas cartridge that is punctured upon operation to pressurize the agent in the main cylinder.

What does the pressure gauge on a stored-pressure extinguisher measure?

Answer: Internal pressure of the combined agent and propellant gas

The pressure gauge measures the internal pressure of the stored-pressure extinguisher, indicating whether it is properly charged.

The PASS acronym used to operate a fire extinguisher stands for:

Answer: Pull, Aim, Squeeze, Sweep

PASS stands for Pull the pin, Aim at the base of the fire, Squeeze the handle, and Sweep side to side.

Why should the nozzle of a CO2 extinguisher never be touched during or immediately after discharge?

Answer: The nozzle can reach extremely cold temperatures causing frostbite

CO2 expansion during discharge causes the horn and nozzle to drop to very low temperatures, posing a serious frostbite risk.

What is the purpose of the O-ring or gasket in the valve assembly of a fire extinguisher?

Answer: To create an airtight seal preventing leakage of agent or propellant

O-rings and gaskets create pressure-tight seals in the valve assembly to prevent agent or gas from leaking during storage.

Which component allows a technician to determine if a water-based extinguisher has sufficient agent without discharging it?

Answer: Weight measurement against the gross weight label

Water-based extinguishers should be weighed and compared to the gross weight on the label to confirm adequate agent level.