How does the GPM rating of a 1 3/4 cross-lay compare to that of a 2 1/2 cross-lay?

The 2 1/2 cross-lay typically has a higher GPM (gallons per minute) rating compared to the 1 3/4 cross-lay due to its larger diameter, which allows for a greater flow of water. A 1 3/4 inch cross-lay is generally designed for multiple applications like residential fires or smaller fire suppression needs, where agility and ease of handling are key factors. It usually delivers a lower GPM, often in the range of 150 to 200 GPM.

In contrast, the 2 1/2 inch cross-lay is typically utilized in high-volume scenarios – such as in structural firefighting in commercial structures or areas with heavier fire loading – where the need for a significant water supply is crucial. This line can provide a GPM rating that exceeds 200, even reaching upwards of 300 GPM, depending on the nozzle and application.

Understanding these differences is important for fire personnel when determining which line to deploy based on the nature of the fire and the required firefighting resources. Higher GPM ratings allow for faster knockdown of fire, making it essential knowledge for effective firefighting strategies.