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Ansi Hi 9.8 Rotodynamic Pumps For Pump Intake Design Jun 2026

The core of HI 9.8 is the geometry of the sump (wet well) relative to the pump bell. For a single pump in a sump, the following parameters are mandated:

Typically recommended between 1.5 to 3.0 m/s (5 to 10 ft/sec), depending on fluid properties. 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: The core of HI 9

And in the world of fluid dynamics, bad manners meant bad intake design. Pre-swirl: And in the world of fluid dynamics,

In the world of fluid handling, the pump is often considered the heart of the system. However, even the most efficiently engineered heart will fail if the veins leading to it are clogged or turbulent. For rotodynamic pumps (centrifugal, mixed flow, and axial flow), the intake structure—the sump, wet well, or suction piping—is that critical vascular system.

The standard provides detailed design guidelines for pump intakes, including: