With an AFFF pump continuously running, how many minutes of AFFF will the tank provide?

With an AFFF pump continuously running, how many minutes of AFFF will the tank provide?

• A. 5 minutes
• B. 10 minutes
• C. 15 minutes
• D. 20 minutes

Answer: (B)

The time a continuously running AFFF pump can feed the tank is found by dividing the tank’s total foam solution by the pump’s discharge rate. In other words, time (minutes) = tank volume (gallons) ÷ pump flow (gallons per minute). For example, if the tank holds 450 gallons and the pump delivers 45 gallons per minute, you get 450 ÷ 45 = 10 minutes. That matches the scenario in the question, so ten minutes is the correct duration. If either the tank volume were larger or the flow rate lower, the time would be longer; if the volume were smaller or the flow higher, the time would be shorter, leading to other options like five, fifteen, or twenty minutes only if the numbers changed accordingly. This calculation helps plan how long you can sustain foam discharge and when to pause or refill.

The time a continuously running AFFF pump can feed the tank is found by dividing the tank’s total foam solution by the pump’s discharge rate. In other words, time (minutes) = tank volume (gallons) ÷ pump flow (gallons per minute).

For example, if the tank holds 450 gallons and the pump delivers 45 gallons per minute, you get 450 ÷ 45 = 10 minutes. That matches the scenario in the question, so ten minutes is the correct duration. If either the tank volume were larger or the flow rate lower, the time would be longer; if the volume were smaller or the flow higher, the time would be shorter, leading to other options like five, fifteen, or twenty minutes only if the numbers changed accordingly. This calculation helps plan how long you can sustain foam discharge and when to pause or refill.