Ansi Hi 9.8 Rotodynamic Pumps For Pump Intake Design ^new^ Jun 2026

A more convenient form of the equation, often used for vertical turbine pumps in imperial units, is:

The standard mandates physical scale modeling for stations that exceed specific flow thresholds, typically when an individual pump exceeds or when the total station flow exceeds 100,000 GPM (6,300 L/s) . Models are built at scales ranging from 1:5 to 1:20 and operate using Froude similitude to replicate surface vortex phenomena accurately. The Role of Computational Fluid Dynamics (CFD) ansi hi 9.8 rotodynamic pumps for pump intake design

To comply with ANSI/HI 9.8, an intake design must satisfy strict hydraulic performance limits during testing or simulation: A more convenient form of the equation, often

A distinctive feature of ANSI/HI 9.8 is its detailed classification of vortices that can form in pump intakes. The standard identifies six types of free‑surface vortices (Type A1 through Type A6) and three types of subsurface vortices (Type B1 through Type B3). These classifications allow engineers to systematically evaluate the severity of vortex formation during physical model studies. The standard identifies six types of free‑surface vortices