A 1 3/4 line flows how many gallons per minute (gpm)?

The flow rate of a 1 3/4 inch diameter hose can vary based on several factors, but a common estimate places the flow rate in the range of 120 to 180 gallons per minute. This range is generally accepted in firefighting as a good balance of flow and pressure for a line of this diameter under most operating conditions.

The figure is influenced by the pressure at which the water is delivered, the length of the hose, and the nozzle used at the end of the line. The 1 3/4 inch hose is typically used for handlines and can provide effective flow for attack and suppression efforts, particularly in structural firefighting situations. Understanding this flow rate is critical for fire operations, as it helps firefighters determine the capability of their equipment in delivering sufficient water to extinguish flames.

The other options suggest flow rates that are higher or lower than what is typically expected for a 1 3/4 line. For instance, options that propose flow rates of 40 to 60 gallons per minute would be too low for effective fire suppression, while estimates exceeding 180 gallons per minute would likely require larger diameter hoses or specialized nozzles to achieve. Therefore, the range of 120 to 180 gallons per minute accurately