How many gallons per minute is typically used for each 1-3/4 inch handline?

The typical flow rate for a 1-3/4 inch handline is commonly recognized to be around 150 gallons per minute (gpm). This flow rate strikes a balance between providing sufficient water for effective firefighting and allowing for manageable handling by firefighters. The 1-3/4 inch handline is designed for interior fire attack and is well-suited for dealing with structural fires, where an adequate water supply is essential for extinguishing flames while still being practical for the crew to maneuver.

Choosing 150 gpm reflects industry standards based on performance guidelines and historical data. This flow rate is often associated with a nozzle that is effective in maintaining pressure while delivering a good volume of water, contributing to quicker knockdown of fires.

While other choices might suggest higher flow rates, they generally correspond to larger diameter hoses or are utilized in different firefighting scenarios where greater volumes of water are necessary. Thus, 150 gpm is typically the standard used for the efficient operation of a 1-3/4 inch handline in both training and real-world firefighting situations.