Air and gas pocket entrainment in pressurized sewer systems are a major issue for many wastewater agencies due to decreased capacity, increased pumping and maintenance costs, corrosion, and reduction in efficiency. The Orange County Sanitation District has been concerned about air pocket formation in their Newport Force Main Network. In this study, we performed field tests to determine if air pockets existed within OCSD’s large diameter force main from the Bitter Point Pump Station to Plant 2 and the effects of air entrapment on the hydraulic performance of the system. Several flow scenarios were analyzed during the field tests, which were performed with air valves open and air valves closed to compare flow and pressure fluctuations when air cannot escape the system. The effective flow area was analyzed to determine the decrease experienced when large quantities of air were present within the force main. Little information is available in regards to field studies performed on air and gas pocket formation outside of a controlled laboratory, so the type of tests and the methodology proposed in this study could be used as guidelines by other agencies facing similar problems.
|Commitee:||Cassidy, William, Phillips, Bruce|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 52/01M(E), Masters Abstracts International|
|Subjects:||Civil engineering, Mechanical engineering|
|Keywords:||Air packets, Force main, Pipeline, Pump station, Sewage, Wastewater|
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