Siphon systems with pump priming
Siphon systems with pump priming
(OP)
Can anybody clarify the valving/pump arrangement for a pump priming system which then supports the formation of siphon. I am looking for practical examples where this has been employed. We are also seeking advice on the pump type required. The flow rates are i teh order of 75 l/s but with mimimal head less than 6 metres.





RE: Siphon systems with pump priming
RE: Siphon systems with pump priming
You may want to consider a check valve in the suction line to help maintain the siphon flow and also an air vent valve in the discharge line to remove air previously contained in the siphon that will be displaced into the discharge line as the pump starts.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Siphon systems with pump priming
Are you interested in a self priming pump?
http://www
RE: Siphon systems with pump priming
RE: Siphon systems with pump priming
Any pump will do if you are only going to have to do it once. Install a filling line and an air release line (both with isolation valves) at the highest point, close the discharge valve, and start filling the line and releasing the air. Once the line is full and the air is all gone close off the filling line and the air release line and you are ready to roll.
If you want the pump to re-initiate the siphon automatically every time you will need a much larger pump.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Siphon systems with pump priming
You should use a full port block valve installed below the lake water level on the discharge side of the siphon. Install a a tee fitting on the siphon and connect the siphon to a self-priming pump, eductor, or vacuum pump. Once you have all of the air removed from the siphon, valve off the pump and slowly open the block valve. You are going to have use a large pump to get this done since the siphon pipe is probably going to around 25 cm or so in diameter.
Not sure why you want to use such an arrangement on such a large flow. Is this a temporary arrangement? Why don't you just install an overfull weir?
RE: Siphon systems with pump priming
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Siphon systems with pump priming
I have run 12 inch diameter siphons with these pumps.
RE: Siphon systems with pump priming
RE: Siphon systems with pump priming
Probably the most practical approach is use a small eductor connected to a small water pump to evacuate the air, rather than a vacuum pump.
You can make some assumptions. Call someone like Penberthy to get the particulars on the eductor.
http://www.penberthy-online.com/jet7c.asp
RE: Siphon systems with pump priming
RE: Siphon systems with pump priming
Run the pump for 5 min. and turn it off.
No valves at all, let the water go through the pump. The pipe will not freeze in the case of the non-submerged discharge.
Never rely on checks, sooner or later they leak.
Steve Wagner
RE: Siphon systems with pump priming