Ansi Hi 9.8 Rotodynamic Pumps For Pump Intake Design (2027)

ANSI/HI 9.8 Rotodynamic Pumps for Pump Intake Design

The standard provides comprehensive criteria for designing pump intakes to ensure uniform, steady flow free from swirl and entrained air. Proper intake design is critical to maintaining high hydraulic efficiency, reducing vibration, and preventing premature pump failure. Core Design Principles

For Horizontal Pumps (Suction Piping)

References & Further Reading

3. Wall and Floor Clearances

If the pump is against a back wall (common in narrow sumps). ansi hi 9.8 rotodynamic pumps for pump intake design

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Swirl is measured using a vane-type anemometer or Acoustic Doppler Velocimetry (ADV) at four quadrants of the suction pipe. ANSI/HI 9

  • Sump intake: A submerged intake with a sump or a pit.
  • Canal intake: An intake that draws fluid from a canal or an open channel.
  • Pipe intake: An intake that draws fluid directly from a pipe.
  • Test criteria: Inject dye or air bubbles to visualize vortices.
  • Pass/fail: No air-entraining vortices (Type 5 or 6) over 72 hours of continuous operation at all flow rates.
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