For a 150 ft run with friction loss of 9 psi per 100 ft, what is the friction loss and the required nozzle pressure to maintain PDP of 120 psi?

For a 150 ft run with friction loss of 9 psi per 100 ft, what is the friction loss and the required nozzle pressure to maintain PDP of 120 psi?

• A. Friction loss = 13.5 psi; nozzle pressure = 106.5 psi
• B. Friction loss = 9 psi; nozzle pressure = 111 psi
• C. Friction loss = 18 psi; nozzle pressure = 102 psi
• D. Friction loss = 13.5 psi; nozzle pressure = 120 psi

Answer: (A)

The pumping discharge pressure must cover both the friction loss along the hose and the pressure at the nozzle. PDP equals friction loss plus nozzle pressure. For a 150 ft run at 9 psi per 100 ft, friction loss is 150/100 × 9 = 13.5 psi. To maintain a PDP of 120 psi, the nozzle pressure must be 120 − 13.5 = 106.5 psi. So the friction loss is 13.5 psi and the required nozzle pressure is 106.5 psi.

The pumping discharge pressure must cover both the friction loss along the hose and the pressure at the nozzle. PDP equals friction loss plus nozzle pressure. For a 150 ft run at 9 psi per 100 ft, friction loss is 150/100 × 9 = 13.5 psi. To maintain a PDP of 120 psi, the nozzle pressure must be 120 − 13.5 = 106.5 psi. So the friction loss is 13.5 psi and the required nozzle pressure is 106.5 psi.