Head-Flow Curves illustrate which relationship?

Head-Flow Curves illustrate which relationship?

• A. The relationship between discharge head (pressure) and flow for the pump
• B. The relationship between NPSH and efficiency
• C. The relationship between motor speed and temperature
• D. The relationship between bearing wear and flow

Answer: (A)

Head-flow curves show how the pump’s discharge head (the pressure energy the pump adds to the fluid) depends on the flow rate. This relationship is central to pump hydraulics: usually, as flow increases, the head the pump can deliver decreases because of internal losses and the limits of energy transfer by the impeller. Engineers use this curve together with the system’s head–loss curve to find the operating point where the pump’s head matches what the piping system requires at that flow. This concept specifically describes hydraulic performance, not other relationships like NPSH versus efficiency, motor temperature versus speed, or bearing wear versus flow, which is why the correct choice is the one that ties discharge head to flow for the pump.

Head-flow curves show how the pump’s discharge head (the pressure energy the pump adds to the fluid) depends on the flow rate. This relationship is central to pump hydraulics: usually, as flow increases, the head the pump can deliver decreases because of internal losses and the limits of energy transfer by the impeller. Engineers use this curve together with the system’s head–loss curve to find the operating point where the pump’s head matches what the piping system requires at that flow. This concept specifically describes hydraulic performance, not other relationships like NPSH versus efficiency, motor temperature versus speed, or bearing wear versus flow, which is why the correct choice is the one that ties discharge head to flow for the pump.