water-air slack flow
water-air slack flow
(OP)
If your water pipeline is designed for slack flow with no air release or vacuum breaker, and you start with a fixed amonut of dissolved air in your water at pump suction, pump it through the pipeline (hilly)and then discharge it to the same pressure as source pressure (pump suction pressure, will the amount of air be the same at the discharge point(in = out = conservation of mass)?
Thanks.
Thanks.





RE: water-air slack flow
RE: water-air slack flow
RE: water-air slack flow
RE: water-air slack flow
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: water-air slack flow
RE: water-air slack flow
Entrapped air in a pipeline can lead to the development of sudden shifts of water column at very high velocity, sometimes high enough to fracture the pipe. For this reason, when plastic piping systems are first filled with water for operation, the piping should be filled carefully and relatively slowly to minimize air entrapment. Air should be vented from the highpoints before the system is pressurized..
Automatic air an vacuum valves have been used to allow the quick automatic admission of air that might be needed to prevent collapse of a thin walled pipe during the fast drainage what would take place through a broken force main or during a water-column separation following a power failure.
It would be preferred, that the problem of possible collapse of pipes should be solved by the use of pipe having walls sufficiently strong to withstand the induced added crushing loads.
The Water Pollution Control Federation Manual of Practice No. FD-4 "Design of Wastewater and Stormwater Pumping Stations" states "A minimum velocity of 1.2 m/s (4 ft/sec) is required in the pipeline to shear the bubble and keep it moving downgrade."
RE: water-air slack flow
RE: water-air slack flow
Steve
RE: water-air slack flow
RE: water-air slack flow
RE: water-air slack flow
What kind of check valve down stream of the pump is used?
RE: water-air slack flow
RE: water-air slack flow