Compact Pump Sump Design

by Richard L. Voigt, Univ of Minnesota, Minneapolis, United States,
Joseph M. Wetzel, Univ of Minnesota, Minneapolis, United States,
Yung Shen, Univ of Minnesota, Minneapolis, United States,

Abstract: This paper details the design criteria chosen to construct a pump sump within several on-site constrictions. The physical size restrictions of the site necessitated the construction of a sump with limited width. The limitation in width reduced cross-sectional area of the flow passage. In order to increase the cross-sectional area of the flow passage in the region of the sump screens and thus reduce flow velocity, two dual flow travelling screens were considered for installation in a longitudinal configuration. Furthermore, the proposed sump width is much smaller than the required width as recommended by the screen manufacturer. The inflow to the sump was through two parallel pipes, and the ensuing jets were dispersed by a properly dimensioned baffle wall upstream of the screens. Hydraulic model tests were performed at a scale of 1 to 8 to determine adequacy of the pump sump design criteria. The model study aided the design by defining several modifications to the sump interior and also provided qualitative and quantitative information regarding the overall sump performance. A detailed velocity measurement program was undertaken to assure that the velocity profile at each screen face was within the reasonably uniform criteria established during the design phase. Spatial and temporal sensitivity analyses were done to verify the flow stability.

Subject Headings: Hydraulic models | Pumps | Hydraulic design | Model tests | Velocity profile | Sensitivity analysis | Construction sites | Cross sections

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