Pump NPSH Calculator

Calculate Net Positive Suction Head available (NPSHa) and pump shaft power. Verify cavitation margin against required NPSH from the pump curve.

Surface pressure (kPa abs)

Static suction head (m)

Suction line friction loss (m)

Vapor pressure (kPa abs)

Fluid density (kg/m³)

NPSHr from pump curve (m)

Flow rate (m³/hr)

Total dynamic head (m)

Pump efficiency (%)

Tab to move between fields

NPSHa (m)

12.61

NPSH margin (m)

9.61

NPSH ratio (NPSHa/NPSHr)4.2

Pressure head (m)10.35

Vapor pressure head (m)0.24

Hydraulic power (kW)4.08

Shaft power (kW)5.44

Shaft power (HP)7.29

Nss1,591.62

How to Use This Calculator

Enter Surface pressure (kPa abs), Static suction head (m), and Suction line friction loss (m).
Set Vapor pressure (kPa abs), Fluid density (kg/m³), and NPSHr from pump curve (m).
Adjust Flow rate (m³/hr), Total dynamic head (m) as needed.
Review NPSHa (m) and NPSH margin (m).
Use NPSH ratio (NPSHa/NPSHr) and Pressure head (m) to inform your decision.

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