Net Pump Discharge Pressure is calculated as the difference between which two pressures?

• A. Discharge Pressure And Intake Pressure
• B. Tank Pressure And Discharge Pressure
• C. Intake Pressure And Discharge Pressure
• D. Atmospheric Pressure

Answer: (C)

Net pump discharge pressure represents the pressure gain the pump provides over what’s available at the suction. It’s found by subtracting the intake (suction) pressure from the discharge pressure, showing how much pressure the pump adds to the water as it leaves the pump. For example, if the discharge pressure is 120 psi and the intake pressure is 50 psi, the net pump discharge pressure is 70 psi. Atmospheric pressure or tank pressure don’t reflect the pump’s hydraulic gain in the discharge line, so they aren’t used in this calculation.