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filmfann's avatar

Why would beer in a keg go flat?

Asked by filmfann (40259 points ) July 31st, 2012

My son came home from a party with a partially full keg of beer. He was instructed to finish it off, then return it.
We have noticed the beer (Blue Moon) is getting flatter each day.
Should we keep it under pressure?
We are keeping it in the refrigerator.

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2 Answers

downtide's avatar

Once it’s no longer full it will start to go flat as the gases in the beer are released into the air inside the keg. The only way to stop that happening is to re-fill it with beer, or as you say, put it under pressure. Do you have an air-compressor?

Congratulations though. Blue Moon is an absolutely delicious beer. One of the bars I go to in Manchester sells it. If you can’t find a way to re-pressurise the keg, I vote for drinking it all. Any excuse. :)

Adirondackwannabe's avatar

Beer goes flat because the CO2 disappates into the atmospheric air that enters the keg as the beer flows out. We had a CO2 system for our kegs in college. It kept the beer from going flat.

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