Vacuum Assisted Pipelines Operationby Wilson B. Smith, Huth Engineers Inc, Lancaster, PA, USA,
Dale L. Zeiders, Huth Engineers Inc, Lancaster, PA, USA,
Abstract: In the process of upgrading the sewerage facilities for Lancaster, Pennsylvania, it was decided to combine two existing facilities into one new facility. This required the design of three miles (4. 8 km) of 36- and 42-inch (91- and 106-cm) force main through an urban area where available alignments were limited. The selected alignment had high points that impinged on the hydraulic grade line and controlled the pumping head. The final design utilized vacuum pumps at the high points to evacuate the line and maintain negative pressures to provide siphon action. These installations were estimated to provide pumping-energy savings of 30,000 per year while curtailing odor problems.
Subject Headings: Hydraulics | Pumps | Pipelines | Siphons | Sewers | Alignment | Pressure pipes | Existing buildings | Urban areas | Pennsylvania | North America | United States
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