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Net Positive Suction Head Available (NPSHA)
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NPSHA must exceed the NPSHR (net positive suction head requirement specified by the pump manufacturer or caviation and/or loss of prime will occur.
The site elevation is used to calculate the atmospheric pressure available. The friction pressure losses come from the suction (intake) line, and include the entrance, screen and other losses in bends. The vertical height is the measured vertical distance between the free water surface and the impeller eye.
Determine the absolute pressure at the pump impeller. (Based on water properties)
Site Elevation:
ft
m
Friction Pressure Losses:
ft of water
m of water
bars
kPa
psi
Vertical Height:
ft
m
Atmospheric Pressure:
ft
NPSHA:
ft of water
m of water
bars
kPa
psi
Other Pump Conversion Formulas
Pressure Conversions
Flow Conversions
Temperature Convertions
Vacuum Conversions
Speed Change (Affinity Laws)
Weight Converter
Length Converter
Viscosity Conversion
Volume Conversion and Calculations of Cylinders, Squares, and Rectangles
Pipe Velocity & Minimum Pipe Diameter
Required Pump Horsepower
Net Positive Suction Head Available (NPSHA)
Total Dynamic Head
Horsepower Conversion
Density to Specific Gravity
