U shaped siphon piping

[nikolastrojman]

Can someone please help me with my problem of designing the u shaped siphon pipline between two tanks.
I have made a sketch of a problem so you can better understand what's the problem about.

Thanks

 

[BigInch]

That's a drain not a siphon. On a siphon the gooseneck is higher than all liquid surfaces.

Independent events are seldomly independent.

 

[nikolastrojman]

And what about this one...

 

[bimr]

What are you trying to do? Are you attempting to construct a loop seal?

You have to include some type of vent to allow the fluid to move.

Please explain.

 

[cvg]

your diagram points to an "inverted" siphon. Commonly done in gravity sewers where crossing under another utility line or structure that cannot be re-located. I would not recommend this unless you have no other choice. Except for sanitary sewer traps which prevent methane from coming back up through a drain, why would you want to do this?

http://www.lmnoeng.com/Channels/InvertedSiphon.htm

 

[nikolastrojman]

Well, the lower tank is actually in contact with atmosphere, it is an open type of tank, my drawing is wrong, so i guess that answers your question bimr.

I'm not making this up, and I'm not trying to construct anything, I'm just trying to understand why is this pipeline done in this way. I will try to send you tomorrow some pictures of the actual pipeline so you can see what's it really about.

 

[bimr]

It the pipe is oversized or if a vent was installed on the top of the loop, you would be able to drain the tank and leave a heel in the tank bottom. If that is the purpose.

The upper tank also needs some type of vent or the fluid would not drain.

 

[nikolastrojman]

Here are the pictures of the actual piping route between tanks as I promised.

 

[bimr]

It appears that the piping was designed this way because of the equipment arrangement.

There is not adequate space for all the valves if the pipe was installed straight downward from the tank.

The horizontal movement allows the barrel to be located away from the base of the tank. Otherwise, it is too crowded at the base of the tank.

I am not sure that this is actually a siphon. It looks to just be a method to drain something from the tank, not siphon the tank.

 

[Compositepro]

It appears that there is a mixing tee at the bottom of the "U" and the "U" is intended to keep this point submerged at all times. The "U" then overflows through a large diameter pipe and large lay-flay hose into a drum (tank 2). These serve as a siphon breaker and splash preventer.