There was none.
The American National Standards Institute (ANSI) and the Hydraulic Institute (HI) have collaborated to develop a standard for rotodynamic pumps, specifically focusing on pump intake design. This standard, ANSI/HI 9.8, provides guidelines and recommendations for the design of pump intakes to ensure efficient and reliable operation of rotodynamic pumps. ansi hi 9.8 rotodynamic pumps for pump intake design
Both surface and subsurface vortices can entrain air or create localized low-pressure zones, leading to cavitation. Pre-swirl: There was none