Ansi Hi 9.8 Rotodynamic Pumps For Pump Intake Design

: These originate from the bottom or sidewalls of the sump and enter the pump inlet. While they do not entrain air, they carry highly concentrated rotational energy that creates structural vibrations and localized cavitation. Flow Asymmetry and Non-Uniform Velocity Profiles

: These draw air or floating debris from the water surface down into the pump suction. Air entrainment as low as 1% to 2% can severely degrade pump performance, induce severe vibrations, and break the pump's prime. ansi hi 9.8 rotodynamic pumps for pump intake design

The foundation of the standard was built upon extensive hydraulic research and field experience: : These originate from the bottom or sidewalls