What two factors define the rated capacity of a pump?

The rated capacity of a pump is fundamentally determined by the flow rate and the pressure under which the pump operates. Specifically, gallons per minute pumped provides a measure of the volume of fluid the pump can move within a specified period, which directly relates to its capacity. Pressure head, on the other hand, refers to the height to which the fluid can be pumped against gravity and includes the resistance caused by friction within the system and any elevation changes. Together, these two factors—flow rate and pressure—enable operators to evaluate the efficiency and suitability of the pump for a given application, ensuring it meets the specific demands of the system it is servicing. The interplay between these elements is crucial for achieving optimal performance in fluid delivery systems.