Pumping station design examples

Abstract

This chapter provides an overview on several redesigned wastewater pumping stations. One of these stations is the Clyde Wastewater Pumping Station in Contra Costa County, California, which is rebuilt in 1991 to feature a self-cleaning sump. It is cleaned by pumping the water level down while vigorously mixing the contents with water from the force main. Hydraulic design includes sizing the force main and developing the system curves, which are then used to select the number and size of the pumps. The rest of the facility is designed around the pumps. The force main invert elevation at the pumping station should, if possible, be set to allow for a constantly rising slope. Another station, the Kirkland Pumping Station, is also redesigned to meet the changing requirements. Station system headlosses in the force main are calculated from the manifold to the point of discharge. Instead of the asbestos cement pipe used in the original project, HDPE is the material selected for the force main. Losses are initially calculated for a Hazen-Williams C of 140 and then recalculated for a C of 120. Another station, the Jameson Canyon Pumping Station, is constructed to replace an existing installation at the Cache Slough Reservoir, which receives water from the Sacramento River system and delivers it to the City of Vallejo, California, Fleming Hill Water Treatment Plant. Vertical turbine pumps are selected for the new station because it could be constructed without the cost of a pump room below ground level.