(refer to HI 9.8 figures):
The ANSI/HI 9.8-2024 standard provides updated guidelines for rotodynamic pump intake design to ensure uniform flow and prevent issues like vortex formation and excessive swirl ansi hi 9.8 rotodynamic pumps for pump intake design
The is a foundational industry standard that bridges fluid mechanics with practical engineering to ensure the efficient and reliable operation of pumping systems. Established by the Hydraulic Institute , this standard provides rigorous guidelines for designing intake structures that minimize hydraulic issues like swirl, air entrainment, and vortex formation. Core Design Objectives (refer to HI 9
The approach channel length upstream of the pump bay should be at least , with a gradual transition. Bends, expansions, or contractions must be fitted with turning vanes or flow straighteners per HI 9.8 Section 6. Bends, expansions, or contractions must be fitted with
More practically, HI 9.8 includes tables and curves that correlate submergence to Froude number (Fr), preventing surface vortex formation.
For a new pump station design compliant with ANSI/HI 9.8:
ANSI/HI 9.8 is an American National Standard developed by the . It provides definitive guidelines for the hydraulic design of pump intakes for rotodynamic pumps (centrifugal, mixed flow, and axial flow). Proper intake design ensures uniform, swirl‑free flow entering the pump, directly impacting reliability, efficiency, and maintenance costs. The standard is widely referenced by engineers, owners, and regulatory bodies for new installations and major retrofits.