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Home Brew Forums > Home Brewing Beer > Bottling/Kegging > Keg was carbonated 2 wks, then went flat? (pics)
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Old 04-13-2013, 07:09 PM   #1
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Default Keg was carbonated 2 wks, then went flat? (pics)

I kegged a Shock Top Clone March 30th, 2013, it's been on 10 PSI at 37 F for 2 weeks now. Yesterday I tried it and it was perfect. Perfect head, highly carbonated with lots of bubbles rising to the surface down to the last drink.



8 glasses later, the head all disappeared and there was an acidic taste and it was undrinkable.



Now today, the beer it back to where it was and tastes ok again.

Maybe it needed more than 2 weeks to carbonate fully and pouring 8 glasses took CO2 out of the beer? Then letting it set overnight allowed it to carbonate again?

That's one theory, but now that I think about it, maybe there's just a very slow leak that is undetectable with starsan spray?

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Old 04-13-2013, 07:51 PM   #2
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You sure you weren't just drunk from 8 glasses of beer ? Kegs don't de-carb that fast. Could have been something in the glass that did it? I see you have two different glasses. The acidity is strange, which makes me think it was something in the glass, not the beer, soap perhaps? How is the beer now?

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Old 04-13-2013, 07:53 PM   #3
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The 1st glass today was good - ok taste and an inch of head.

Then the 2nd glass was back to being terrible, no head, but it does have CO2 bubbles rising to the surface at the right amount. I used a new glass.

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Old 04-13-2013, 08:41 PM   #4
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Quote:
Originally Posted by theveganbrewer View Post
You sure you weren't just drunk from 8 glasses of beer ? Kegs don't de-carb that fast. Could have been something in the glass that did it? I see you have two different glasses. The acidity is strange, which makes me think it was something in the glass, not the beer, soap perhaps? How is the beer now?
You may be right. The 1st glass today had CO2 bubbles but no head and a bad acid taste. The 2nd glass (new glass) has tons of head and CO2 bubbles and now the taste is much less acidic, but the nice tasting flavor I had is gone.

I'm still not sure what is going on. I did vent the oxygen out of the keg before sealing it.
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Old 04-13-2013, 09:35 PM   #5
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I guess the other thing could have been some sort of beer line cleaner that was in the lines or tap, but that wouldn't have lasted to another day. I'm trying to think of all the places good beer could go wrong on the way from keg to glass. Diptube, connector, beer line, shank, faucet, glass. Start checking them off and figure out where it's coming from. The beer couldn't vary that much from pour to pour.

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Old 04-13-2013, 10:40 PM   #6
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I have new beer lines and haven't cleaned them yet, diptube has never been cleaned, connectors have a new o-rings on them, faucet is just the cheap picnic keg plastic one that comes with the starter kit.

OK, I was thinking about the fact that I used SanStar in the keg and did not let it drip dry. I was in a hurry and just rinsed it out with the kitchen sink sprayer. I did use the right concentration, but there may have been alot of SanStar left in the keg. I wonder if it would kill head and change the taste while allowing the carbonation level to be normal? Just a theory.

I still believe the flavor has been ruined from yesterday to today. When the beer was not ready yet (I was checking it once a day) I did see a lot of soapy looking bubbles in the glass. Can SanStar ruin flavor? Even so, why would the flavor be good one day and bad the next? I am new to home brewing, so who knows what I've done wrong.

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Old 04-14-2013, 01:41 AM   #7
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If you're worried about StarSan, pull the keg out to room temps for a few days.

I heard at one point that yeast can metabolize leftover StarSan. Can't remember the reference though, sorry.

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Old 04-14-2013, 03:10 AM   #8
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I was looking around, and it could be that my 3/16" beer lines are only 4.75 feet long. But would that explain how 8 glasses are perfect, and then I get flat tasting beer afterwards?

I just ordered 10 foot lines.

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Old 04-14-2013, 03:24 AM   #9
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Warm lines, shanks and faucets cause more foaming until they get cold.

But that wouldn't explain your acidic taste. Are you serving at 10 psi or just carbing at that?

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Old 04-14-2013, 04:07 AM   #10
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Quote:
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Warm lines, shanks and faucets cause more foaming until they get cold.

But that wouldn't explain your acidic taste. Are you serving at 10 psi or just carbing at that?
I carbed and served at 10 PSI. Was just trying to keep it simple bc I screwed the last keg up. I think it's weird that taste would change from one day to the next.
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