What is the maximum efficient flow for 1 3/4 inch hose?

What is the maximum efficient flow for 1 3/4 inch hose?

• A. 350 gpm
• B. 250 gpm
• C. 750 gpm
• D. 1200 gpm

Answer: (B)

For a 1 3/4 inch attack hose, the most efficient operating flow is around 250 gpm. Water moving through smaller hose creates friction losses that rise quickly as flow increases. Pushing beyond about 250 gpm means steeply higher friction losses along the hose and greater nozzle reaction, which require more pump pressure and harder control, without giving corresponding gains in effective reach or volume. Flows like 350 gpm or more put you into impractical pressures and handling challenges for this hose size, while 750 or 1200 gpm are far beyond what this hose can efficiently deliver. So 250 gpm is the best balance for efficiency with a 1 3/4 inch line.

For a 1 3/4 inch attack hose, the most efficient operating flow is around 250 gpm. Water moving through smaller hose creates friction losses that rise quickly as flow increases. Pushing beyond about 250 gpm means steeply higher friction losses along the hose and greater nozzle reaction, which require more pump pressure and harder control, without giving corresponding gains in effective reach or volume. Flows like 350 gpm or more put you into impractical pressures and handling challenges for this hose size, while 750 or 1200 gpm are far beyond what this hose can efficiently deliver. So 250 gpm is the best balance for efficiency with a 1 3/4 inch line.