Calculate NPSH Available (NPSHA) to prevent pump cavitation.
System Parameters
m
m
m
m
Calculation Results
Enter parameters to calculate NPSHA
Quick Reference
HₐAbsolute pressure at source
H_zStatic suction head/lift
H_fFriction losses in piping
H_vpaVapor pressure of liquid
Overview
NPSH (Net Positive Suction Head) is a critical factor in pump selection and system design. NPSH Available (NPSHA) represents the amount of pressure available at the pump suction to prevent liquid from vaporizing and causing cavitation.
💡
Pro Tips
NPSHA must always be greater than NPSH Required (NPSHR) by the pump manufacturer.
Increasing the height of the fluid level above the pump increases NPSHA.
Lowering the fluid temperature decreases vapor pressure and increases NPSHA.
Cavitation can cause severe damage to the pump impeller and casing.
!
Fun Facts
"Cavitation sounds like pebbles are passing through the pump."
"In extreme cases, cavitation can erode stainless steel impellers in a matter of days."
"The 'H' in NPSH stands for 'Head', which is a way of expressing pressure as the height of a liquid column."
