PerryS
Well-Known Member
If you've ever been on a family road trip, there will be a time when you hear "are we there yet?" from the back seat. Every parent dreads that question. Likewise, every brewer must answer the question, "Is it done yet?" For every batch.
In the pursuit of bomb-proof (in the bottle-bomb sense) high-gravity ales, I have fallen into the habit of evacuating the carboy to de-gas the wort. Winemakers, who regularly deal with 1.200+ OGs, will recognize "de-gas". I happened upon the vacuum secondary concept when I was attempting to de-gas a mead. The usual DIY method is to cut a plastic clothes hanger to size, and whip the ever-livin' **** out of the must with a variable-speed drill. Seemed a bit abusive to the yeast, by my reckoning. A slight shake/swirl under vacuum pulls an amazing amount of CO2 out of wort/must.
In high-gravity worts/musts, the yeast reach a point where they can no longer exhale CO2/ethanol because the solution is saturated. The osmotic pressure on their little cell membranes just doesn't allow them to convert any more sugar. As the Queen would say, "this is a situation up with which we shall not put."
I use a #6 cork that has been drilled (1/2" hole saw, IIRC), and has a Vacu-Vin (tm, likely) stopper in it. Vacu-Vin is a hand-operated vacuum pump purportedly for wine snobs, but it makes a dandy [cheap!] method for reducing the osmotic pressure on my overworked high-gravity yeasties. (If you must know, I brew with Wyeast 3787 High Gravity Trappist, and Lavlin D-47.)
The Vacu-Vin allows the yeast to ferment another .001-.002 FG, and then really stop and drop. Then, the must/wort clears phenomenally. I have concluded that cloudy beer is mostly yeast that are riding CO2 bubbles up and down the carboy like a carnival ride. The key is to let the yeast do their thing, exhaling CO2 and ethanol up to their cellular membrane limits for free glucose vs ethanol/lipid degradation. At that point, it's just not possible for them to make bottle bombs, because they are truly "done". The wort/must falls clear when the yeast are done riding the CO2 elevator and dragging every random protein with them.
I do, however, have one question, which is the point of this post.
How do I remove the cork when it's time to bottle? There is a vacuum in there. Fort Collins is at 5000', and the pressure altitude in that carboy is somewhere around 60,000', like close to outer space. When it's time to bottle, should I just let the air back in? Should I blow CO2 back into the carboy? If so, how? Or should I just not worry about it?
I suspect the forced CO2 folks have some kind of cool tool to do this. If you have a cool [cheap!] way to remove the cork without letting in a bunch of O2, I'd like to know! Thanks, and RDWHAH.
In the pursuit of bomb-proof (in the bottle-bomb sense) high-gravity ales, I have fallen into the habit of evacuating the carboy to de-gas the wort. Winemakers, who regularly deal with 1.200+ OGs, will recognize "de-gas". I happened upon the vacuum secondary concept when I was attempting to de-gas a mead. The usual DIY method is to cut a plastic clothes hanger to size, and whip the ever-livin' **** out of the must with a variable-speed drill. Seemed a bit abusive to the yeast, by my reckoning. A slight shake/swirl under vacuum pulls an amazing amount of CO2 out of wort/must.
In high-gravity worts/musts, the yeast reach a point where they can no longer exhale CO2/ethanol because the solution is saturated. The osmotic pressure on their little cell membranes just doesn't allow them to convert any more sugar. As the Queen would say, "this is a situation up with which we shall not put."
I use a #6 cork that has been drilled (1/2" hole saw, IIRC), and has a Vacu-Vin (tm, likely) stopper in it. Vacu-Vin is a hand-operated vacuum pump purportedly for wine snobs, but it makes a dandy [cheap!] method for reducing the osmotic pressure on my overworked high-gravity yeasties. (If you must know, I brew with Wyeast 3787 High Gravity Trappist, and Lavlin D-47.)
The Vacu-Vin allows the yeast to ferment another .001-.002 FG, and then really stop and drop. Then, the must/wort clears phenomenally. I have concluded that cloudy beer is mostly yeast that are riding CO2 bubbles up and down the carboy like a carnival ride. The key is to let the yeast do their thing, exhaling CO2 and ethanol up to their cellular membrane limits for free glucose vs ethanol/lipid degradation. At that point, it's just not possible for them to make bottle bombs, because they are truly "done". The wort/must falls clear when the yeast are done riding the CO2 elevator and dragging every random protein with them.
I do, however, have one question, which is the point of this post.
How do I remove the cork when it's time to bottle? There is a vacuum in there. Fort Collins is at 5000', and the pressure altitude in that carboy is somewhere around 60,000', like close to outer space. When it's time to bottle, should I just let the air back in? Should I blow CO2 back into the carboy? If so, how? Or should I just not worry about it?
I suspect the forced CO2 folks have some kind of cool tool to do this. If you have a cool [cheap!] way to remove the cork without letting in a bunch of O2, I'd like to know! Thanks, and RDWHAH.