KEG QUESTIONS: from a newbie to kegs

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JMcG
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Re: KEG QUESTIONS: from a newbie to kegs

#16 Post by JMcG » Thu Mar 19, 2015 9:25 am

Now if you transfer your beer into the keg, close the lid, and pressurize to 30 psig (45psia), then you're tripling the pressure and mass of the gas in the keg. The gases will mix, so if you vent all of the pressure back out of the keg, you've effectively reduced the amount of oxygen in the head space by 1/3rd. If you do 3 rounds of pressurizing & venting, that takes your oxygen content below 1% (by volume) of the total gas in the headspace of the keg. If you only use 10psi, you can still get below 1%, but you have to repeat the purging process 6 times.
"Principle of Serial Dilutions"

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Joe Yoder
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Re: KEG QUESTIONS: from a newbie to kegs

#17 Post by Joe Yoder » Thu Mar 19, 2015 9:59 am

Well done, Kevin!! I guess I have been too lazy to do the calculations and just erred on the side of NO oxygen at all. I may keep doing what I have been doing and frankly I don't do it every time, but your post makes it easier for me to justify less diligent keg purging.
Joe

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