What is a System Curve? Its Importance in Pump Selection and Calculation

What is a System Curve?

A system curve is a characteristic graph that defines the hydraulic properties of a piping system and serves as a crucial reference for pump systems. This curve is determined by considering factors such as static head differences on the suction and discharge sides, system pressure differences, and frictional losses within the piping network.

In other words, the system curve graphically represents the resistances and pressure variations a fluid encounters as it moves through the system. It plays a critical role in pump selection and efficiency analysis. Accurately calculating the system curve ensures optimal compatibility between the pump and the piping network.

The operating point of a system is determined by the intersection of the pump characteristic curve and the system curve. Precisely determining this point provides significant benefits in terms of energy efficiency and system performance.