TFM-04 Fire Extinguisher License – A (FEL-A) Practice Test

What percentage pressure loss on a Halon 1301 system requires replacement or refill?

5% Pressure 15% Pressure 10% Pressure 20% Pressure

Correct Answer:

10% Pressure

Explanation:

In Halon 1301 fixed suppression systems, keeping the cylinder pressurized is crucial for a reliable discharge to achieve the required agent concentration in the protected space. If the cylinder pressure drops, it means there’s less agent or a slower release than designed, so the system may not perform as intended during an incident. A 10% reduction from the normal charged pressure is the commonly used threshold at which the system should be refilled or replaced to restore proper performance. Smaller losses are typically within tolerance, while larger drops indicate significant leakage and require service.

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