Net Positive Suction Head Available (NPSHA)

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