What is the pump discharge pressure for 300 feet of 1 3/4 hose with a 15/16-inch smooth bore nozzle?

To determine the pump discharge pressure needed for a specific length of hose and a nozzle, it's essential to consider both the friction loss in the hose and the nozzle pressure.

When dealing with 1 3/4-inch diameter hose, the friction loss per 100 feet is generally around 15.5 psi under typical flow conditions. Therefore, for 300 feet of hose, you would calculate the total friction loss as follows:

Friction loss = (300 feet / 100 feet) × 15.5 psi = 3 × 15.5 psi = 46.5 psi.

Next, you’ll also need to account for the nozzle pressure, which depends on the nozzle size. A 15/16-inch smooth bore nozzle typically operates at a pressure of about 50 psi for optimal performance.

Adding these two values together gives the total pump discharge pressure:

Total pump discharge pressure = Friction loss + Nozzle pressure

Total pump discharge pressure = 46.5 psi + 50 psi = 96.5 psi.

However, this answer does not match any of the choices provided. Upon closer review, it’s crucial to consider other factors such as potential elevation changes, specific flow characteristics needed during an actual firefighting scenario