Performance Characteristics of Centrifugal Pumps
Although the theory of centrifugal pumps gives many qualitative results, the most important indicator of a pump’s performance lies in extensive hydraulic testing.
In industry, characteristics of all pumps are usually read from its Q-H curve or performance curve (flow rate – height). As can be seen, the performance charts use a discharge – Q (usually in m3/h) and pump head – H (usually in m) as basic performance variables.
The performance curve (published by pump manufacturer) is typically cut off at some point beyond the pump’s allowable operating range (AOR). The point at which the performance curve ends is referred to as runout. Decreasing pressure to and below the runout point may overload the pump motor, which can vibrate and be overheated. Therefore the operation beyond this point should be avoided.