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Post by gusso on Nov 17, 2021 17:18:09 GMT -6
More times than not, when I ferment under pressure, I typically let the CO2 go to waste. Not this time! I sanitized and purged 3 kegs so far. Still 2 more in the garage.
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Post by Leftympfrmde on Nov 18, 2021 3:38:07 GMT -6
Waiting for my next brew day to do something similar. Dont ferment under pressure, but want to rig a hose from the airlock, to a keg filled with sanitizer, to another keg to collect the expelled santizer- so come time to package the beer, a purged and clean keg is ready.
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Post by Ken on Nov 18, 2021 8:40:35 GMT -6
Yep, I do this on every keg. The keg for that batch is purged with the CO2 from fermentation. It means you have to clean and sanitize a keg on brewday (which I did NOT used to do) but I'm used to it now. Been doing that for 2 years or so. Supposedly the amount of CO2 produced by one 5-gallon batch is enough to fully purge 20 kegs of O2.
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Post by tommymorris on Nov 18, 2021 10:24:58 GMT -6
Yep, I do this on every keg. The keg for that batch is purged with the CO2 from fermentation. It means you have to clean and sanitize a keg on brewday (which I did NOT used to do) but I'm used to it now. Been doing that for 2 years or so. Supposedly the amount of CO2 produced by one 5-gallon batch is enough to fully purge 20 kegs of O2. Any idea how much Starsan is left in the keg after? Does that matter? I use floating dip tubes. They don’t empty the keg as well as a regular dip tube. So, it worries me that I would be leaving 8 ounces of Starsan in the keg after the purge.
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Post by Ken on Nov 18, 2021 10:52:17 GMT -6
Yep, I do this on every keg. The keg for that batch is purged with the CO2 from fermentation. It means you have to clean and sanitize a keg on brewday (which I did NOT used to do) but I'm used to it now. Been doing that for 2 years or so. Supposedly the amount of CO2 produced by one 5-gallon batch is enough to fully purge 20 kegs of O2. Any idea how much Starsan is left in the keg after? Does that matter? I use floating dip tubes. They don’t empty the keg as well as a regular dip tube. So, it worries me that I would be leaving 8 ounces of Starsan in the keg after the purge. When I clean and sanitize the keg I push everything out with CO2 until it seems like the keg is pretty much empty. That's with traditional dip tubes. If I had to guess, I would say there is just a trace of sanitizer in the keg.
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Post by Seven on Nov 18, 2021 12:42:54 GMT -6
I usually only purge one keg (the eventual serving keg) when fermenting but I've been meaning to do this. Unfortunately, I rarely have more than 1 keg cleaned out!
Remaining sanitizer seems pretty variable to me based on my 7 or 8 kegs. Not sure if prior keg owners trimmed the dip tube or if it's just different manufacturers. That said, I'd estimate that the amount left is probably between 1-3 oz.
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Post by Ken on Nov 18, 2021 13:18:37 GMT -6
I usually only purge one keg (the eventual serving keg) when fermenting but I've been meaning to do this. Unfortunately, I rarely have more than 1 keg cleaned out! Remaining sanitizer seems pretty variable to me based on my 7 or 8 kegs. Not sure if prior keg owners trimmed the dip tube or if it's just different manufacturers. That said, I'd estimate that the amount left is probably between 1-3 oz. If I were worried about that I would clean and sanitize the keg on brewday as normal and push the sanitizer out with CO2 and if I thought there was more sanitizer in there than I preferred I would open the keg and dump it out. After all, we're not purging the keg by blowing out the sanitizer with CO2 (that doesn't actually purge the keg... the LO guys experimented with that), we're purging the keg with the CO2 from fermentation so dump it out, reconnect the lid and connect the keg to the fermenter however you choose and allow the fermentation to purge the keg. Boom, done.
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Post by tommymorris on Nov 18, 2021 14:48:21 GMT -6
I usually only purge one keg (the eventual serving keg) when fermenting but I've been meaning to do this. Unfortunately, I rarely have more than 1 keg cleaned out! Remaining sanitizer seems pretty variable to me based on my 7 or 8 kegs. Not sure if prior keg owners trimmed the dip tube or if it's just different manufacturers. That said, I'd estimate that the amount left is probably between 1-3 oz. If I were worried about that I would clean and sanitize the keg on brewday as normal and push the sanitizer out with CO2 and if I thought there was more sanitizer in there than I preferred I would open the keg and dump it out. After all, we're not purging the keg by blowing out the sanitizer with CO2 (that doesn't actually purge the keg... the LO guys experimented with that), we're purging the keg with the CO2 from fermentation so dump it out, reconnect the lid and connect the keg to the fermenter however you choose and allow the fermentation to purge the keg. Boom, done. Thanks. I will try that.
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Post by gusso on Nov 18, 2021 18:42:42 GMT -6
I've checked on the remaining starsan and even with my floating diptubes, it's only a few ounces. Less with regular diptubes. Ken, how doesn't a keg get purged when pushing starsan through it? I do purge the head space first then force the starsan out.
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Post by Ken on Nov 18, 2021 19:12:59 GMT -6
I've checked on the remaining starsan and even with my floating diptubes, it's only a few ounces. Less with regular diptubes. Ken, how doesn't a keg get purged when pushing starsan through it? I do purge the head space first then force the starsan out. I don't remember the specifics but the LO guys (who look deeply into these things) said that a keg would have to be filled with CO2 and then purged 20 times to actually get the O2 out of the keg. My guess with the Starsan solution is that it's part water which is part O2 and so some remains in the keg afterwards. I know you're seeing this and thinking that this is really splitting hairs and I agree. I used to pump an empty keg full of CO2 and then release it thinking that it was completely purged of O2... not so. But if we connect a keg to the fermenter and purge the keg that way, we can forget about all of that and focus on making and drinking beer.
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Post by gusso on Nov 19, 2021 5:25:21 GMT -6
Ok. I guess that makes sense.
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Post by denny on Nov 23, 2021 13:32:56 GMT -6
Ok. I guess that makes sense. Not to me it doesn't. If the O2 can disassociate, so can the hydrogen. And it doesn't.
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Post by shaggaroo on Nov 23, 2021 13:56:28 GMT -6
Ok. I guess that makes sense. Not to me it doesn't. If the O2 can disassociate, so can the hydrogen. And it doesn't. Not sure what you mean here Denny... O2 doesn't dissociate under normal conditions...
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Post by tommymorris on Nov 24, 2021 7:05:32 GMT -6
Not to me it doesn't. If the O2 can disassociate, so can the hydrogen. And it doesn't. Not sure what you mean here Denny... O2 doesn't dissociate under normal conditions... Actually, I think Denny is correct. Ken said water is part O2 and the O2 can disassociate. We know H2O will not easily disassociate. I think that was Denny’s point. I am not sure of the correct answer to the original question. But water doesn’t easily break into H and O. Maybe Ken meant there is O2 dissolved in water and that O2 can come out of solution.
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Post by gusso on Nov 24, 2021 7:25:04 GMT -6
But how much dissolved O2 could be a a few ounces of starsan? Can't be very much.
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