ctoungette
Active Member
Ok, Just got all of my kegging equipment and I am ready to start filling them. I know not everyone flushes the keg with co2 before filling but would like to know the process. Help please!
I have flare connectors on all my lines. I simply install a liquid QD on my gas line and install it on the liquid out fitting on the keg. Then I open the relief valve and let the CO2 flow through the dip tube until all the air is purged out.
in theory, yes. but that really only happens in fantasy land. gasses never stratify so idealy in real life. if you purge a keg once at 15psi, you will be left with about 10% oxygen, which is still too much.CO2 is heavier than air, so it will have settled to the bottom.
if your goal is to get a final oxygen concentration down to around 1%, then you need to purge the keg 4 times at 15psi. why, you ask?
atmospheric pressure is 14.7psi. call it 15 to make it easy. air contains about 21% oxygen.
if your headspace contains 21% oxygen at 15psi, and you add another 15psi of pure CO2, you will then have 11.5%O2, and the rest mainly CO2 and nitrogen. purge it back down to atmospheric pressure (15psi). you still have the same concentration of gasses, but just less pressure.
fill it again with 15psi of CO2. you now have 5.75% O2, the remainder CO2 and nitrogen.
do it a third time, you get down to about 2.5% oxygen.
do it a fourth time and you have just over 1% oxygen.
in theory, yes. but that really only happens in fantasy land. gasses never stratify so idealy in real life. if you purge a keg once at 15psi, you will be left with about 10% oxygen, which is still too much.
Very nice math. Now you have me thinking about all that Co2 being consumed.
I clean my kegs, put on all of the fittings, etc. Then fill with iodophor solution completely to the top, to where it just starts to spill out the top.
Very nice math.
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