Examples
Examples
Try the starting example
- Absolute free-surface pressure (Pa)
- 101325
- Fluid vapour pressure (Pa)
- 2339
- Surface height above pump datum (m)
- 2
- Suction line head loss (m)
- 1
- Density (kg/m³)
- 998
- NPSH available (m)
- 11.113991
Try another scenario
- Absolute free-surface pressure (Pa)
- 111457.50000000001
- Fluid vapour pressure (Pa)
- 2339
- Surface height above pump datum (m)
- 2
- Suction line head loss (m)
- 1
- Density (kg/m³)
- 998
- NPSH available (m)
- 12.149289
Calculation method
Calculation method
NPSH available (m)
NPSHa=(pAbs-pVap)/(rho g)+surfaceHeight-headLoss.
Symbols and units
- a
- Absolute free-surface pressure (Pa)
- b
- Fluid vapour pressure (Pa)
- c
- Surface height above pump datum (m)
- d
- Suction line head loss (m)
- e
- Density (kg/m³)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Reservoir surface velocity neglected. No required-NPSH/cavitation pass verdict. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Reservoir surface velocity neglected. No required-NPSH/cavitation pass verdict.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.