What is the friction loss in 300 feet of 3" fire hose with 2-1/2" couplings flowing 500 gpm?

To determine the friction loss in the fire hose, it is essential to use the appropriate formula for calculating friction loss in fire hose. For a 3-inch diameter hose, a common rule of thumb is to use a friction loss of approximately 15 psi for every 100 feet of hose when the flow rate is at 500 gallons per minute (gpm).

Since the question specifies that the length of the hose is 300 feet, we can calculate the friction loss as follows:

1. First, establish the friction loss per 100 feet at a flow rate of 500 gpm. This value is typically around 10 to 15 psi per 100 feet, depending on the specific characteristics of the hose being used.

2. With a 300-foot length, we can break this down into three segments of 100 feet. Therefore, using the average friction loss of 15 psi per 100 feet for a 3" hose flowing 500 gpm, the calculation would be:

• Friction loss for 300 feet = 3 (100-foot segments) x 15 psi per 100 feet = 45 psi.

However, additional factors may affect the overall calculation, such as the type of water flow, the