air in pressure sewer systems
air in pressure sewer systems
(OP)
I was wondering if anyone had any information in regards to multiphase flows. That is the effect of air in a pressure sewer line.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
air in pressure sewer systems
|
RE: air in pressure sewer systems
If the sewer is pressurised as indicated and a full bore flow is ensured then the air effect may be simplified by a reduction of the wave velocity.
Air is known to greatly attenuate the wave velocity, 0.1% and the wave speed could be halved. Consult "Fluid Transients" by EB Wylie and VL Streeter books. The reduced wave speed will help you to assess the flow conditions but getting the air out and have it under control is another matter.
RE: air in pressure sewer systems
RE: air in pressure sewer systems
Simplified procedure with samll trapped air pockets can be handled by traditional single-phase water hammer study treating the air pocket as a boundary condition. Air relief valve can be sized as a byproduct of such analysis.
RE: air in pressure sewer systems
RE: air in pressure sewer systems