Blowing CO2 into bottles and carboys

[tag (tom)]

So you’re saying you would need to pressurize your carboy with more pressure than in the keg?  That seems dangerous to me and I mostly use plastic buckets so I cannot pressurize a plastic bucket.  Your also assuming that I connect to the beer out line and I do not do that either I insert an open end of the plastic tubing into the bottom on the keg.

I release the keg pressure valve before transferring so it doesn’t take much pressure to transfer.
I would consider filling the keg through the beer-out tube. Less splashing.
With a bucket you could easily siphon it into the keg.

I think oxidation is a big thing in homebrewing because our surface to volume ratio is so high.  But if you drink the beer within a few weeks it shouldn’t matter.

[morticaixavier]

So you’re saying you would need to pressurize your carboy with more pressure than in the keg?  That seems dangerous to me and I mostly use plastic buckets so I cannot pressurize a plastic bucket.  Your also assuming that I connect to the beer out line and I do not do that either I insert an open end of the plastic tubing into the bottom on the keg.

I release the keg pressure valve before transferring so it doesn’t take much pressure to transfer.
I would consider filling the keg through the beer-out tube. Less splashing.
With a bucket you could easily siphon it into the keg.

I think oxidation is a big thing in homebrewing because our surface to volume ratio is so high.  But if you drink the beer within a few weeks it shouldn’t matter.

No don’t pressurize the carboy more than the keg. as he said yo urelease the pressure from the keg before transfering from the carboy. but if your using buckets that wouldn’t work it’s true. your still reducing your o2 contact if you depressurize the keg and rack in as normal.

to the OP I have not worried about purging carboys, bottles. Probably I should but when I am bottleing I am doing a secondary ferm in teh bottle so I figure the yeast will eat up any o2 in the headspace.

[jlap]

I’m not sure that it’s true that CO2 will sink to the bottom or form a blanket above the beer in a carboy.  Aren’t atoms/molecules of gas randomly distributed?  My understanding is that when you purge with CO2 you are gradually decreasing the percentage of O2 but that the O2 will never be zero.  It will never be 100% pushed out because of the greater molecular mass of the CO2.

[morticaixavier]

@jlap

I’m not sure that it’s true that CO2 will sink to the bottom or form a blanket above the beer in a carboy.  Aren’t atoms/molecules of gas randomly distributed?  My understanding is that when you purge with CO2 you are gradually decreasing the percentage of O2 but that the O2 will never be zero.  It will never be 100% pushed out because of the greater molecular mass of the CO2.

you are correct
that is why with kegs you should purge all air with santizer and then replace with CO2. but with a carboy you can’t purge all the O2 safely as you would have to fill the keg with sanitizer and then push it out with CO2, I suppose you could do that at low presure and then as long as you are carefull to not stir the ‘air’ in the empty carboy to much while racking to it…