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Old 06-07-2012, 04:34 PM   #1
moleary
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Default Is this bad? (picture included)

Whenever I drain the wort from my mash, I get air bubbles in the tube. Is this oxidizing my beer? Is this bad? If it is, how do I get rid of it? When I pinch the tube they go away for a minute but just come back when I let go. If I open the valve up full stream they go away, but then I am extracting the wort too fast, right?

Any suggestions would be appreciated.

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Old 06-07-2012, 04:37 PM   #2
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if you are worried about it why not put a hose clamp on the barb
i dont think you need to worry that much about hot side aeration

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Old 06-07-2012, 04:40 PM   #3
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People use a tube?

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Old 06-07-2012, 04:41 PM   #4
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The bubbles are coming in from the hose around the barb, use a clamp. They go away when pinched because it is the flow that causes them and when full open they go away because the high volume hides them. I am not certain they are bad and I am not certain that the high flow is bad. Once the flow has started on my mash tun I open the valve all the way so I do not see a problem with starting it slowly then opening it up.

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Old 06-07-2012, 04:51 PM   #5
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I'm not an expert but I don't think its an issue at all. Your not going to oxidize the wort in a negative way at this stage because splashing/air bubbles are beneficial prior to fermentation.

I recently read that to actually oxidize beer post fermentation and create off flavors etc. you would have to aggressively pump a lot of air into solution and/or splash etc. for an extended period of time. TIME is the actual factor (aging time) of the beer. You will probably drink it before the off flavors take over. All beer has some degree of oxidation. It would be a problem if it was a light style that was highly oxidized and stored in inadequate conditions for longer than usual. This probably wont happen. But in your case prior to pitching, its not a concern!

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Old 06-07-2012, 05:55 PM   #6
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Relax. Don't worry. Have a homebrew!

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Old 06-07-2012, 06:01 PM   #7
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Besides my previous advice to RDWHAHB, my opinion as a chemical engineer has a theory.

It kind of looks like your tube is kinked a bit right at the hose barb. This may be causing turbulent flow which is creating the air bubbles. The bubbles aren't going away because once the flow gets past the kink the velocity is too slow to overcome the bouyancy of the bubbles and push them out the tube.

Try replacing the tube or wrap the first few inches past the barb in duct tape or something to firm it up a bit and get the kink out. Maybe that will fix it.

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Old 06-07-2012, 06:05 PM   #8
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Ok thanks, I'll try a hose clamp and see how that goes.

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Old 06-07-2012, 06:39 PM   #9
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Quote:
Originally Posted by Phyrst View Post
Besides my previous advice to RDWHAHB, my opinion as a chemical engineer has a theory.

It kind of looks like your tube is kinked a bit right at the hose barb. This may be causing turbulent flow which is creating the air bubbles. The bubbles aren't going away because once the flow gets past the kink the velocity is too slow to overcome the bouyancy of the bubbles and push them out the tube.

Try replacing the tube or wrap the first few inches past the barb in duct tape or something to firm it up a bit and get the kink out. Maybe that will fix it.
Along these lines, get yourself some silicone instead of vinyl tubing and it wont kink. I used vinyl for my first few mashes and at those temps the tubing kinks very easily.
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Old 06-07-2012, 06:48 PM   #10
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A number of solutions:

1) Don't worry about it. It's not going to oxidize your beer.
2) Ditch the vinyl and get some silicon hose.
3) Install a 45° or 90° elbow so the line won't kink.

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