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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.

Centrifugal pump head vs flow




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.

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