FE Extinguisher Components & Operation Flashcards

In a cartridge-operated extinguisher, what component must be checked and possibly replaced at each annual inspection?

Answer: Gas cartridge weight and seal condition

The gas cartridge must be weighed and its seal inspected annually to confirm it holds its charge and is ready for operation.

What is the function of the hose assembly on large dry chemical extinguishers?

Answer: To allow the agent to be applied from a distance and aimed precisely at the base of the fire

The hose assembly gives the operator reach and the ability to aim the nozzle at the fire's base from a safe distance.

What happens to a CO2 extinguisher's pressure gauge reading in cold temperatures?

Answer: It reads lower than actual pressure, which may appear as undercharge

CO2 pressure drops significantly in cold temperatures, causing a gauge reading that appears low even if the cylinder is fully charged.

Why is the siphon tube length critical in a stored-pressure extinguisher?

Answer: A tube that is too short may prevent full discharge of the agent

If the siphon tube is too short, it won't reach the bottom of the cylinder, leaving agent behind and reducing effectiveness.

Which of the following describes the operating mechanism of a pump-tank water extinguisher?

Answer: A hand-operated pump pressurizes and discharges water on each stroke

Pump-tank extinguishers rely on a manually operated pump that the user strokes repeatedly to pressurize and discharge water.

What is the role of the locking collar or anti-recoil device on a CO2 extinguisher valve?

Answer: It locks the valve closed during transport to prevent accidental discharge

The anti-recoil or locking collar prevents the valve from accidentally opening during transport, storage, or handling.