Venturi method -- where do you put the hole?

[allanmac00]

I want to try the "venturi effect" for aerating my wort. Can I do this with an auto-siphon? I have two of them and wouldn't mind dedicating one to aeration. If I can use this, where would I put the hole(s)? On the racking cane or on the tubing? Does this system actually work?

 

[Reelale]

I have used a venturi for my last two batches. I pump into the fermentor, so I just placed a plastic "T" in-line, with about 12" tubing beyond the "T". It is about a 1/2" diameter hole. It seems to work well for me. I'm sure I can get better aeration with a stone and 02, and I may go to that. I would think you can drill the hole anywhere in the line, just make sure you have enough outlet line.

 

[OCLemon]

I use a 4 inch section of racking cane attached to the end of my siphon tube where it goes into the fermenter. I melted about 3 dozen holes in the cane with a hot paper clip. Works like a charm.

 

[wyzazz]

I also use the plastic barbed "T", put your thumb over the hole to start the siphon and once it's going fairly well pull your thumb off!

 

[pjj2ba]

I built a second after a discovering a design flaw in my first. I use a short length of polypropylene tubing that I drilled the holes in a spiral (ring would work too). The first one I made had them in line and air got sucked into the first hole, but then because of all the air, the lower holes didn't set up a venturi. Now they are spaced out so one hole doesn't affect the other.

 

[allanmac00]

I use a 4 inch section of racking cane attached to the end of my siphon tube where it goes into the fermenter. I melted about 3 dozen holes in the cane with a hot paper clip. Works like a charm.

So can I just put some holes into the very end of the vinyl racking tube that extends from the auto-siphon?

Also, does anyone have a photo of what theirs looks like?

 

[Reelale]

If you are talking about the curved tube, the tube that fits inside the other, larger tube of the autosypon, you could. Are you running vinyl tubing from that end currently? I would think that placing the venturi apparatus closer in line to the fermentor would maximize O2 into the wort. If it is too far "up the line", the flow a longer time to smooth out (less turbulence=less O2).

 

[Reelale]

Also, does anyone have a photo of what theirs looks like?

If you haven't already, check out this thread.

 

[allanmac00]

If you are talking about the curved tube, the tube that fits inside the other, larger tube of the autosypon, you could. Are you running vinyl tubing from that end currently? I would think that placing the venturi apparatus closer in line to the fermentor would maximize O2 into the wort. If it is too far "up the line", the flow a longer time to smooth out (less turbulence=less O2).

I was talking about the vinyl tube that attaches to the smaller of the two auto-siphon tubes. Just plain old bottling tubing.

 

[Reelale]

Yeah, you can melt holes in it like the other other posters said. Make ur holes about 6-10 inches up from the end, should work fine. I think the general consensus is that fewer, larger holes are better than more, smaller holes.