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Title: Alton Pumping Station, Alton, Illinois : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. St. Louis District
Kirkpatrick, Tommy L.
Fletcher, Bobby P.
Keywords: Formed suction intake
Suction bell
Pump sump
Vortex suppressor devices
Hydraulic structures
Alton Pumping Station, Alton, Illinois
Hydraulic models
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-91-9.
Description: Technical Report
Abstract: General (1:10-scale) and section (1:3-scale) models of the approach channel, sump, and pump intakes of the proposed Alton Pumping Station, Alton, IL, were used to evaluate and develop a practical design that would provide satisfactory hydraulic performance for all anticipated flow conditions. The sump included three pumps with a total design capacity of 223 cfs. Initial operation of the general model with vertical suction intakes indicated substantial swirl in the pump intakes and surface vortices. Various modifications investigated to reduce swirl included elevating the lower edge of the breast wall, closing access ports, streamlining flow by adding a 2.0-ft radius to the lower edge of the breast wall, installing fillets in the corners of the pump bay, and installing a splitter wall beneath the pump bell. A design was developed that provided satisfactory hydraulic performance except when the trashrack was partially blocked. A formed suction intake (FSI) was also investigated in the general model. Test results indicated that swirl in the pump intake was satisfactory with the FSI even when the trashrack was partially blocked. Tests were conducted in a section model primarily to investigate flow distribution in the pump column and to compare hydraulic performance of the vertical suction and formed suction intakes. Flow distribution in the FSI was satisfactory even with 25 percent of the trashrack blocked. The vertical suction and formed suction intakes were similar from a surface vortex standpoint; however, the FSI was superior based on swirl and flow distribution in the pump intake.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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