What is the required flow rate at the hose connection within 3 minutes of opening the hose valve?

What is the required flow rate at the hose connection within 3 minutes of opening the hose valve?

• A. 100 gpm
• B. 250 gpm
• C. 500 gpm
• D. 25 gpm

Answer: (B)

The key idea is that a standpipe hose connection must provide a reliable minimum flow for a first attack. NFPA 14 requires that, within 3 minutes of opening the hose valve, the discharge at the hose connection reach a minimum of 250 gallons per minute. This flow level is chosen to ensure enough water is available to begin suppressing a typical early-stage fire and to account for losses in the piping and fittings after the valve is opened. Smaller flows, like 100 gpm or 25 gpm, would generally be inadequate for an effective initial attack, while 500 gpm exceeds the minimum requirement. The 3-minute timeframe ensures the system delivers this necessary flow promptly so firefighters can begin suppression without delay.

The key idea is that a standpipe hose connection must provide a reliable minimum flow for a first attack. NFPA 14 requires that, within 3 minutes of opening the hose valve, the discharge at the hose connection reach a minimum of 250 gallons per minute. This flow level is chosen to ensure enough water is available to begin suppressing a typical early-stage fire and to account for losses in the piping and fittings after the valve is opened.

Smaller flows, like 100 gpm or 25 gpm, would generally be inadequate for an effective initial attack, while 500 gpm exceeds the minimum requirement. The 3-minute timeframe ensures the system delivers this necessary flow promptly so firefighters can begin suppression without delay.