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Estimation of the required NPSH, using the Thoma factor
Default

Input data

Flow

Manometric height

Pump's rotation

Output data

NPSH

Description

Given the values of flow, manometric head, and pump rotation, this calculation estimates the required NPSH (Net Positive Suction Head). In general, the obtained value is very conservative, ensuring the pump's safe operation.

NPSH

Input and output parameters table:

ParameterStandard UnitsDescription
Flow (QQ)L/sPump flow rate
Manometric height (HH)mPump's manometric head
Pump's rotation (ww)rpmPump's rotational speed
Required NPSHmEstimated required NPSH

References

  • VIANNA, Marcos R. Estações Elevatórias de Sistemas de Abastecimento de Água. E-book. Belo Horizonte, 2021.