Curves
1. Head vs Flow
2. System curve
3. Flow vs Efficiency
4. Flow vs Power consumption
5. Flow rate vs Low static head and High static head.
Pump control by VFD: Variable Frequency Drive.
Effect of Over size pump
1. Head vs Flow
Centrifugal pump's Head vs Flow graph is gradually down trend.
It is called Pump Characteristic Curve.
It means
when flow is minimum then Head is maximum &
When flow is maximum then Head is minimum.
2. System curve [ Head vs Friction head loss ]
When
Flow is increased head loss also increasing
Head is increasing head loss is also increasing.