Curves and Performance

Pump, Motor, and Performance Curve Datasheet Comparison

How to compare performance curves, operating points, efficiency, duty cycle, head, torque, speed, power, and continuous versus peak ratings.

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Why can maximum power be misleading in a product comparison?

Maximum power may be a peak, intermittent, thermal-limit, or stall condition. Continuous power at the required operating point is usually more useful for design comparison.

How should pump curves be compared?

Compare flow and head at the same operating point and fluid condition. Efficiency, NPSH, speed, viscosity, temperature, and pressure limits should remain attached to the curve or point used.

What motor values should not be merged?

Rated torque, stall torque, peak torque, continuous torque, speed, input power, output power, efficiency, duty cycle, and thermal limit each describe different behavior and should be kept distinct.