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Old 01-29-2013, 04:46 PM   #1
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Default Corny Fermenting

Hey everyone,

Because of the free freezer I got, I will be fermenting lagers in corny kegs. I have gas QD's with some hose run to a pitcher that I will use as airlocks. Now my question is do I remove the poppets or leave them in?

Thanks and cheers


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Old 01-29-2013, 05:13 PM   #2
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I'd leave them in. They aren't going to hurt anything fro allowing CO2 to escape and it will be handier if you push the beer out with CO2 later. Did you cut the dip tube down to allow for trub?

I'm thinking about using a keg for lagering in. I've never fermented in one.


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Old 01-29-2013, 05:16 PM   #3
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Good call on the transferring note. I plan on transferring with CO2 so I will have to have them in.

I decided not to cut the tubes. I am going to bend them a little. I figure this way, if something doesn't go right, I can always straighten the tube back out and use the keg for something else.

My freezer will fit 2 corny kegs or 1 carboy. I figured I'd try something new with the corny kegs and 8-9 gallons in the kegs is more than 5 from a carboy :-)
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Old 01-29-2013, 05:51 PM   #4
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Northern Brewer has replacement dip tubes for $17, so not cutting might be a good choice.

The only thing to think about is the amount of blow-off you get. For Lagers, it's probably nothing to worry about, but ales can tend to use up the small headspace in a keg VERY quickly! Then you might wish to take out the poppet, else it might get clogged. They are easy to put back in on racking day.
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Old 01-29-2013, 05:58 PM   #5
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I will only be doing lagers in these. I have a part of the house that will stay around 65 all summer so the glass carboys with the ales go there.

As for blow off, lagers will produce a little less and I have heard people swear by Fercap-S, so I'm going to give that a shot if there is too much blow off.
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Old 01-29-2013, 06:49 PM   #6
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I have also been thinking about fermenting in cornies.

Is clogging the diptube really an issue? I had thought that 50 or 60 PSI would push trub/yeast through the tube?
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Old 01-29-2013, 06:54 PM   #7
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If it is an issue, you can always take off the post and slide some 1/2 inch tubing on the threads.

This should be a good learning experience when I finally try it.
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Old 01-30-2013, 12:13 PM   #8
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50-60 lbs pressure might finally push it through. Explosively.

It would probably work though.
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Old 01-30-2013, 05:06 PM   #9
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There are a few good articles on doing this, many ales and many lagers. It appears that the most you want to put in them is 4 gallons in the 5 gallon corny and you probably want to use foam reducer. Some people have attached tubes to the removed popits, others use a quick disconnect with a tube. There doesn't seem to be much of a difference.

The biggest variation is performing pressurized fermentation, something I am planning on testing this spring.
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Old 02-23-2013, 11:55 AM   #10
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Hey everyone,

Just an update. Both corny kegs are working great for lager fermentation.

I thought the Pils wasn't going, but turns out that there wasn't a good seal around the lid which was letting the air out causing no airlock activity.

Can I use keg lube on the seals when using the corny kegs for fermentation?


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