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Overcoming Challenges of Deep Tunnel CSO Storage Pumping

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As part of the City of Portland's combined sewer overflow (CSO) program; Swan Island Pump Station (SIPS) serves as the terminus of two large CSO conveyance and storage tunnels deep beneath the city, designed to collect and store combined sewage. The 150-foot deep, 130-foot diameter below grade pump station was designed in two phases to convey 220 million gallons per day (mgd) to the City's main treatment facility. The first Phase, put in Service in December 2006, consists of two 800-hp dry weather pumps, and two 2,000-hp wet weather pumps, with total pumping capacity of 100-mgd. The second Phase, currently under construction, includes the addition of three 2250-hp wet weather pumps, with an additional pumping capacity of 120 mgd. This paper provides a case history of the SIPS with specific emphasis placed on (1) hydraulic design challenges, (2) pump station operations, and (3) lessons learned from three years of operation associated with the first phase of construction.
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Keywords: Hydraulics; Physical Model; Pump Station; Self-Cleaning Wet Well; Throttling; Variable Speed Pumping

Document Type: Research Article

Publication date: 2009-01-01

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