A special type of priming system involves maintaining flow in a siphon. This is done either to maintain a water level on a downstream sump (siphon control) or for maintaining a siphon to a pumping process (siphon assist).

Siphons are used to transfer water from a higher elevation source to a collection sump at a lower elevation where it can then be pumped for use within a process. Transfer usually requires raising the water level first (over a berm) before being able to transfer it to the lower collection sump. A priming system  can be used for filling the siphon and for maintaining the siphon flow. Since water contains dissolved air, so that the siphon is not lost a prime must be maintained on the siphon at all times to remove air that degasses from the water at the high point. This out-gassing of the dissolved air increases with temperature and with a reduction in pressure. Therefore, as the high point in the siphon increases, the absolute pressure at the high point accordingly decreases with an accompanying increase in the amount of air that is released from the water.

For proper operation in accordance with Bernoulli's equation for steady state flow, siphon design must insure that the absolute pressure at the top point exceeds the vapor pressure for the water at the operating temperature. The pressure at the top of the siphon is a function of the lift height above the source water level, the flow velocity, and the losses within this upstream piping.

LYNN can offer design and sizing assistance for your siphon applications. Stand alone systems for establishing and maintaining siphon prime, or advanced systems to automatically control the flow to maintain desired water levels within secondary containment sumps. Gives us a call, we can help.

All standard systems feature 304/304L stainless steel pipe and fittings. Unlike painted or galvanized piping that shows rust soon after installation, stainless steel retains its clean appearance.

All systems furnished with oil lubricated vacuum pumps feature extended oil drain line to facilitate maintenance. Lines include ball valve isolation to insure easy, clean oil changes.

Draining the receiver of accumulated water is simplified with standard isolation and vent valves. Rapid venting allows accumulated water to drain freely so your back on line without interruption or loss of prime.