What is the minimum flow rate required for the hydraulically most remote standpipe in a Class I system?

What is the minimum flow rate required for the hydraulically most remote standpipe in a Class I system?

• A. 250 gpm
• B. 150 gpm
• C. 300 gpm
• D. 200 gpm

Answer: (A)

The flow rate concept tested is the minimum discharge capacity NFPA 14 requires for the farthest standpipe in a Class I system. The hydraulically most remote standpipe must be able to supply at least 250 gallons per minute. This baseline accounts for friction losses along the longest path from the water supply to the remote outlet and ensures that firefighters can obtain a practical attack flow with standard hose sizes and nozzle pressures. Flow lower than this would risk inadequate water delivery at the farthest point, while 300 gpm would exceed the required minimum unless the hazard or water supply dictates more. The 250 gpm figure is the established minimum to guarantee usable water flow from the most distant standpipe.

The flow rate concept tested is the minimum discharge capacity NFPA 14 requires for the farthest standpipe in a Class I system. The hydraulically most remote standpipe must be able to supply at least 250 gallons per minute. This baseline accounts for friction losses along the longest path from the water supply to the remote outlet and ensures that firefighters can obtain a practical attack flow with standard hose sizes and nozzle pressures. Flow lower than this would risk inadequate water delivery at the farthest point, while 300 gpm would exceed the required minimum unless the hazard or water supply dictates more. The 250 gpm figure is the established minimum to guarantee usable water flow from the most distant standpipe.