65-mm (2½-in.) handline typical flow?

65-mm (2½-in.) handline typical flow?

• A. 378 L/min (100 gpm)
• B. 568 L/min (150 gpm)
• C. 1136 L/min (300 gpm)
• D. 946 L/min (250 gpm)

Answer: (D)

For a 65-mm (2½-in.) handline, the flow is determined largely by the hose size and the nozzle pressure used. A standard attack setup for this size of hose is commonly around 250 gallons per minute, which is about 946 liters per minute. This higher flow provides enough water to begin extinguishing fires quickly while keeping friction losses and nozzle reaction at a manageable level for crew handling on typical fireground distances. If you used a much smaller nozzle or much lower pressure, the flow would drop toward 100–150 gpm; if you pushed for a higher flow with a high-flow nozzle or higher pressure, you could approach or exceed 300 gpm, but that’s less typical for a standard 2½-inch line. So the commonly expected flow for this hose is about 250 gpm (946 L/min).

For a 65-mm (2½-in.) handline, the flow is determined largely by the hose size and the nozzle pressure used. A standard attack setup for this size of hose is commonly around 250 gallons per minute, which is about 946 liters per minute. This higher flow provides enough water to begin extinguishing fires quickly while keeping friction losses and nozzle reaction at a manageable level for crew handling on typical fireground distances. If you used a much smaller nozzle or much lower pressure, the flow would drop toward 100–150 gpm; if you pushed for a higher flow with a high-flow nozzle or higher pressure, you could approach or exceed 300 gpm, but that’s less typical for a standard 2½-inch line. So the commonly expected flow for this hose is about 250 gpm (946 L/min).