| Type | Name | Description | Acceptability | | :--- | :--- | :--- | :--- | | | Surface dimple | A shallow depression, no rotation | Acceptable | | 2 | Surface swirl | Rotating string, extends < 50% to bell | Marginal | | 3 | Swirl with dye trail | Dye streak visible, no air core | Not acceptable for critical service | | 4 | Funnel vortex | Air core reaches bell but not pump | Unacceptable | | 5 | Air-entraining vortex | Air enters the pump | Prohibited | | 6 | Full air core | Continuous air column | Prohibited |
: Rectangular intakes, formed suction intakes (FSI), circular pump stations, and trench-type intakes. ansi hi 9.8 rotodynamic pumps for pump intake design
The core of HI 9.8 is the geometry of the sump (wet well) relative to the pump bell. For a single pump in a sump, the following parameters are mandated: | Type | Name | Description | Acceptability