For a fire hose flowing 350 gpm, what is the friction loss in 300 feet of 2-1/2" rubber-lined hose?

To determine the friction loss for a fire hose flowing 350 gallons per minute (gpm) through 300 feet of 2-1/2 inch rubber-lined hose, we apply the friction loss formula. This formula typically involves calculating the impact of the hose diameter, flow rate, and length.

In this case, using the common friction loss formula for fire hose (which can often be found in NFPA guidelines or fire service training materials), the friction loss is calculated as follows:

1. Flow Rate Influence: The friction loss in a hose increases with the square of the flow rate. This means that if you were to double the flow rate, the friction loss would increase by four times. For a 2-1/2 inch hose flowing 350 gpm, the friction loss can be approximated using a reference table which indicates typical friction losses for that specific setup.

2. Distance Influence: The length of the hose is also crucial; for every additional 100 feet of hose, there is a standard friction loss that can be added to the calculation. Typically, you'll find that the friction loss for a 2-1/2 inch hose is about 6 psi per 100 feet, which is doubled based on