What information is necessary to calculate the theoretical flow from a pump?

To calculate the theoretical flow from a pump, you need to consider the total head, impeller diameter, and pump curve. Total head is crucial because it represents the energy added to the fluid by the pump, accounting for the elevation change and pressure losses in the system. The impeller diameter has a direct influence on the flow rate, as it affects the velocity of the fluid being discharged from the pump.

The pump curve provides essential information about the performance characteristics of the pump, including the relationship between flow rate and head. It also outlines the efficiency of the pump at varying flow rates, which helps in understanding how the pump operates under different conditions. This combination of total head, impeller diameter, and performance data from the pump curve allows for an accurate theoretical calculation of flow rate, making it necessary to include all three elements for a complete analysis.