Since incorporating, Ibis Group has completed over 30 pump station analyses. These analyses are for both proposed design evaluation and diagnostic work on existing stations. For the evaluation of a station, the American National Standard for Pump Intake Design (ANSI/HI 9.8-1998) is used. Presently, this standard is accepted worldwide and stations built to it consistently meet their design performance requirements. The ANSI/HI standard provides recommended ranges for:
- Inlet pre-swirl angle
- Axial velocity distribution
- Surface vortex and submerged vortex entrainment
Basic pump station models are steady state providing time averaged results and have a “rigid lid” or “inviscid wall” representing the water surface.
More advanced models may be time dependent and have a free moving air/water interface at the water surface. It is also possible to document and mitigate regions of potential sediment buildup.