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Pump Performance Curve Equation:
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A pump performance curve is a graphical representation showing the relationship between a pump's flow rate (Q) and its discharge pressure (P). It helps engineers select the right pump for specific applications and predict pump performance under various operating conditions.
The calculation uses interpolation from known pump curve data points:
Where:
Explanation: Linear interpolation is used between known data points from the pump manufacturer's performance curve to estimate discharge pressure at any given flow rate.
Details: Understanding pump performance curves is essential for proper pump selection, system design, energy optimization, and troubleshooting pump operations in various industrial and commercial applications.
Tips: Enter the desired flow rate in GPM and provide pump curve data points as comma-separated Q,P pairs (one pair per line). The calculator will interpolate to find the corresponding discharge pressure.
Q1: What is a typical pump performance curve shape?
A: Most centrifugal pumps show decreasing discharge pressure as flow rate increases, creating a characteristic downward-sloping curve.
Q2: Why is interpolation necessary?
A: Pump curves provide discrete data points, so interpolation is needed to estimate performance at flow rates between these known points.
Q3: What factors affect pump curve accuracy?
A: Fluid viscosity, temperature, impeller wear, system head, and pump speed can all affect actual pump performance compared to published curves.
Q4: How many data points should I provide?
A: Provide at least 3-5 well-distributed points across the operating range for accurate interpolation. More points generally provide better accuracy.
Q5: Can this calculator handle non-linear curves?
A: This calculator uses linear interpolation between points. For highly non-linear curves, consider using curve fitting with polynomial or exponential functions.