The standard applies to the design of new intakes as well as the modification of existing designs used with rotodynamic pumps. It outlines standard intake designs based on certain criteria, beyond which a physical model study is required to demonstrate compliance with the standard.
The standard provides specific geometric recommendations for several common intake types to minimize time spent on scale modeling: Plumbing & Mechanical Pump standards make the word go 'round
θ=tan-1(VtVa)theta equals the inverse tangent of open paren the fraction with numerator cap V sub t and denominator cap V sub a end-fraction close paren Vtcap V sub t is the tangential velocity component of the fluid. Vacap V sub a is the axial velocity component parallel to the pump shaft. Per ANSI/HI 9.8, if
Sloped corner fillets eliminate square dead corners within the rectangular bay, forcing the liquid to stay in motion and eliminating micro-eddies. 5. Piping Configurations for Suction Intake ansi hi 9.8 rotodynamic pumps for pump intake design
The approach flow configuration is highly non-uniform, asymmetrical, or restricted (e.g., a cross-flow intake or an intake fed by a 90-degree angled canal).
The swirl angle in the flow should generally not exceed 5°. 2. Eliminating Vortices
[ S = D \times (1 + 2.3 \times F_D) ]
). This circulation creates a severe pressure drop at the center of the rotation:
ANSI/HI 9.8 outlines strict performance metrics that must be maintained at the pump inlet bell to ensure mechanical stability and efficiency: ANSI/HI 9.8 Acceptance Metric
ANSI/HI 9.8 defines clear thresholds where mathematical formulations and standard dimensions are no longer sufficient to guarantee safety. In these scenarios, a is mandatory. The standard applies to the design of new
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To mitigate these risks, the Hydraulic Institute (HI) developed the industry-defining standard: . This standard provides engineers, contractors, and operators with strict dimensional, geometric, and hydrodynamic criteria necessary to design functional, highly efficient pumping stations. Fundamental Objectives of Intake Design