ANSI/HI 9.8 defines specific geometries for several common intake types. Adhering to these "standard" designs often eliminates the need for expensive physical testing. ANSI/HI 9.8-2018 - Rotodynamic Pumps for Pump Intake Design
The standard (9.8-2018, the latest revision) applies specifically to operating in wet well or open sump configurations . It focuses on:
This standard provides a rigorous framework for designing intake structures that ensure uniform, steady flow free from swirl and entrained air. The Core Objective: Uniform Flow
| Problem | HI 9.8 Solution | |--------|------------------| | Air ingestion | Maintain min submergence + bell clearance | | Uneven flow distribution | Use flow straighteners / longer approach length | | Pre-rotation / swirl | Install anti-swirl baffles or splitter walls | | Low NPSHa | Increase submergence or lower pump elevation |