Halocarbon extinguishing agents require refilling when the loss of agent quantity exceeds what percent?

• A. 10%
• B. 2%
• C. 5%
• D. 7%

Answer: (C)

Halocarbon extinguishing systems must deliver a precise design amount of agent to be effective. Any loss of agent reduces the available quantity, and if too much has leaked or been lost, the system may not reach the required concentration when discharged. The standard guideline is that refilling is required once the cumulative loss exceeds five percent of the design quantity. This 5% threshold keeps the system reliable while accounting for normal, minor leaks. Smaller losses, like 2%, are generally acceptable without a refill, while larger losses (such as 7% or 10%) would compromise performance and require recharging.