Siphon prevention

Question

Siphon prevention

RimShots31 (Civil/Environmental)

(OP)

12 Mar 02 14:36

I have a blower design for air scouring purposes with pipeline to a gravity filter. I need an inverted "pea-trap" on the line to go above the hydraulic grade line of the filters water level (to create an air gap). The pipeline also has a double wafer check-valve and butterfly valve, but failures can happen and there may be some leakage. What can I do to prevent siphoning of water back to the blower when the blower is turned off and valves do not function properly?

turulato (Mechanical) · Answer 1 · 2002-04-01 12:11:52

Your problem is not very clear but usually a 1/4" weep hole dilled at the top of the pipe should prevent any syphoning back into the blower. Just make sure the hole does not blow into anybody's face.
Good luck

RimShots31 (Civil/Environmental) · Answer 2 · 2002-04-01 12:27:14

To help clarify, the blower is sitting below the water level of the filter. To prevent backflow into the blower (when it is off), the pipe elevation was routed above the water level. We decided to add a normally open solenoid valve at the top elevation point of the pipeline. The valve is linked to the blower so that when the blower is energized, the valve will close and no air will escape. When the blower is off, the valve will open and serve to prevent a vacuum situation.

stressriser (Mechanical) · Answer 3 · 2002-04-25 15:50:44

In the water well industry, it is necessary to prevent siphon to eliminate contamination. Vacuum breakers are a common component, and can be found in most general catalogs. Look one up and it would give you an idea of what to do.

A "weep hole" will leak at all times, and it not a good solution.

BtodaG (Mechanical) · Answer 4 · 2002-06-25 07:40:49

I'm dealing with a similar problem, and I have found that as mentioned above, vacuum breakers and siphon breakers are a common solution to such a problem.

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Siphon prevention