Pump Performance Curve Head, efficiency, power vs Liquid flow rate

A centrifugal pump doesn't just have one setting. Its performance changes depending on the flow rate. Engineers use a "Performance Curve" to find the "Sweet Spot" for operation.
The Three Main Curves:
The Head Curve (H-Q): As the flow rate increases, the "Head" (pressure/height) the pump can provide drops. This is usually a downward-sloping curve.

The Efficiency Curve ($\eta$): This looks like an upside-down "U." It starts low, reaches a peak at the Best Efficiency Point (BEP), and then drops again. You always want to operate near the BEP!

The Power Curve (P): This usually rises as flow increases. It represents the energy (Brake Horsepower) required to turn the impeller.Why it Matters:Energy Savings: Operating away from the BEP wastes electricity and costs thousands
.Reliability: Running a pump at very low or very high flow rates causes vibration and seal failure.
System Matching: Where the Pump Curve meets your System Curve is where the plant actually operates.
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Видео Pump Performance Curve Head, efficiency, power vs Liquid flow rate канала Chemical Engineering Education