: Maintaining inlet velocities—typically between 1.2 to 3.0 m/s (4 to 10 ft/sec) —to avoid excessive turbulence and erosion. Intake Types Covered
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Minimizing free-surface and sub-surface vortices that can entrain air or cause pressure pulsations. Swirl Minimization: ansi hi 9.8 rotodynamic pumps for pump intake design
When the river swelled in spring, this intake would be the plant's first line of conversation with the current. It had to speak softly: low velocities at the bell, uniform approach flow, no vortices, no entrained air. Mara remembered the scenario that had brought her here—a municipal station whose pumps had cavitated for three summers running. The diagnostic photos had shown air pockets hugging the suction bell, returning turbulent wakes to the impeller, battering performance and bearings until the bearings protested in smoke-streaked failures. : Maintaining inlet velocities—typically between 1