NPSHA Calculator

Online NPSHA calculator to calculate Net Positive Suction Head Available (NPSHA). It is defined as the absolute pressure at the suction port of the pump. NPSHA is a measure that corresponds to the level of pressure at the pump suction. The higher the pressure, the higher the NPSHA, will result in the better pump that operates well. Enter the atmospheric pressure, vapour pressure, density and gage pressure in this Net Positive Suction Head Available calculator to find the NPSH available.

Net Positive Suction Head Available Calculator

kg/m3

Online NPSHA calculator to calculate Net Positive Suction Head Available (NPSHA). It is defined as the absolute pressure at the suction port of the pump. NPSHA is a measure that corresponds to the level of pressure at the pump suction. The higher the pressure, the higher the NPSHA, will result in the better pump that operates well. Enter the atmospheric pressure, vapour pressure, density and gage pressure in this Net Positive Suction Head Available calculator to find the NPSH available.

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Formula:

NPSHa = (Pa-Pv+Pn)/ρ Where, NPSHa = NPSH Available Pa = Atmospheric Pressure Pv = Vapor Pressure Pn = Gage Pressure at the Pump Suction ρ = Density

Example:

Calculate NPSHA for atmospheric pressure produced in pump of 8, vapour pressure of 9, gage pressure of 7 and density of 12 kg/m3.

Solution:

Net Positive Suction Head Available = (8 - 9 + 7) / 12
=0.5


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