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Old 11-01-2011, 01:39 AM   #1
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Default Troubleshoot this Corny Keg problem

I have a good friend who has a keg that consistently produces foam. He brewed up and kegged a batch of Hefe for my Oktoberfest party and I carbed it with a few other kegs.

When I tapped it, I noticed that he gave me the foamy keg. The funny thing, the keg does not leak gas or beer, but when you dispense it, you can actually hear what sounds like air being introduced into the beer line as it dispenses. You can can see nothing but foam as it traverses the clear beer line to the faucet.

We've taken the post off and replaced the poppet and still the same. I'm wondering if anyone else ever came across this problem.

If we cannot solve it, I will wrap duct tape around it and mark "STOUTS ONLY" on it.

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Old 11-01-2011, 02:06 AM   #2
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Pin hole leak perhaps, not enough to leak or show until you draw on it? I'd submerge it in a bathtub (remove beer) and pressurize to check for bubbles.

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Old 11-01-2011, 02:10 AM   #3
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There are only two things that make any sense from the symptoms: One is a persistent infection, the other is a problem with the Out post. I'd swap the Out post with another keg and see if the problem moves...

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Old 11-01-2011, 02:11 AM   #4
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Maybe a pin hole near the top of the out dip tube? If the hole is above the beer line maybe you get some kind of venturi action as beer goes up the dip tube. Swap the dip tube and see if the problem goes away.

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Old 11-01-2011, 02:53 AM   #5
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Quote:
Originally Posted by JRems View Post
Maybe a pin hole near the top of the out dip tube? If the hole is above the beer line maybe you get some kind of venturi action as beer goes up the dip tube. Swap the dip tube and see if the problem goes away.
Oooh. Brilliant! Never had a holed dip tube but that does sound like a solid possibility.

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Old 11-01-2011, 02:53 AM   #6
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Had 1 do something similar had a leak when pressure dropped when tapping replaced the relief valve and stopped hope this helps.

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Old 11-01-2011, 02:56 AM   #7
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I'll agree that the dip tube hole is a possibility.

More likely the out post has a gouge in it that prevents a proper seal from being formed when the disconnect is put on.

More likely because the posts are out there exposed to the world, and ten thousand of them will get damaged for every one freak accident that punches a hole in a dip tube....

Could also be a bad disconnect, but since you say this only happens with one specific keg, I'd look at the post.

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Old 11-01-2011, 02:56 AM   #8
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I'll second (or is it third?) the hole in the dip tube above the liquid level. Only thing I can imagine that would cause that to happen....

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Old 11-01-2011, 02:58 AM   #9
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Quote:
Originally Posted by JRems View Post
Maybe a pin hole near the top of the out dip tube? If the hole is above the beer line maybe you get some kind of venturi action as beer goes up the dip tube. Swap the dip tube and see if the problem goes away.
I'm thinking the same thing. It's like it's acting like a Stout restrict plate causing the foam.

The keg does not leak at all.

I'm going to swap out the dip tube tomorrow and see what happens.
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Old 11-01-2011, 08:46 AM   #10
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I had a keg that always poured slow and just slightly foamy. I finally figured out that the diptube was the wrong style for the keg, and it barely left enough space under it for the beer to get through. I trimmed 1/16" off the diptube and the problem was solved. Doesn't sound like that's the issue here, but maybe food for thought.

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