### Pump Performance Curves

• Identify the appropriate pump performance curves for a system.

• Use pump scaling laws to predict the performance of a system.

• Power-Flow Curves

A centrifugal pump performance curve is a tool that shows how a pump will perform in terms of head and flow. Pumps can generate high volume flow rates when pumping against low-pressure head or low volume flow rates when pumping against high-pressure head. The possible combinations of total pressure and volume flow rate for a specific pump can be plotted to create a pump curve. The curve defines the range of possible operating conditions for the pump. Pump curves plot data on a graph with x and y axes. The x axis (vertical) shows total head while the y axis (horizontal) shows flow capacity, typically gpm.
The operating point is where the system curve and the actual pump curve intersect.

Typical pump performance curves are:
• Head vs. Flow Curve (H-Q Curve)
• Efficiency Curve
• Power/ Energy Curve
• NPSH Curve

### Solved Example:

#### 67-1-02

A performance curve for a given centrifugal pump shows that: