Pump Sizing

Head, flow and NPSH for a pump against a system curve.

Pump Sizing Calculator

Centrifugal pump selection, system curves, and NPSH analysis

System Parameters

Pump Type

Fluid

Pipe Material

Flow & Head

Flow Rate

L/min

Static Head

Suction Head (+flooded/-lift)

Piping

Pipe Diameter

Total Pipe Length

Fittings K-factor

Environment

Site Elevation

Motor Efficiency

Pump Requirements

Total Head

15.5 m

Motor Power

0.76 kW

Flow Velocity

0.66 m/s

Reynolds

52946

Friction Head

0.32 m

Fittings Head

0.22 m

NPSHa

13.02 m

NPSHr (est)

4.66 m

System & Pump Curves

Affinity Law Predictions (Speed Variation)

Design Notes & Recommendations

Flow Regime

Turbulent (Re = 52946)

Friction factor f = 0.0226

NPSH Margin

NPSHa / NPSHr = 2.79

✓ Adequate NPSH margin (>1.3x)

Velocity Check

⚠ Low velocity - consider smaller pipe

Specific Speed

Ns = 0.24 rad

Radial (low flow, high head)

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