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Old 11-20-2012, 04:48 PM   #1
mooney
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I am An air conditioning engineer. This means I have lots of use full things kicking about in my van.

I have a vacuum pump for evacuating refrigeration pipe work, its a powerfull thing which is used to suck out moisture so can evaporate water at cold temperatures so i'm guessing can evaporate alcohol, with its lower boiling point. Has any one ever used some thing like this for degassing wine? I have seen methods using much smaller hand pumps over long periods of time. could this be a time saver and a half rugged up to a drilled rubber cork? can a Demi John cope with pressure of a vaccume?

I also have welding gear, which comprises oxygen and acetylene. Is this welding grade oxygen any good for oxygenating at the start? Would I just blast it threw an air stone for a few seconds? Any one use pure oxygen for this?

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Old 11-20-2012, 04:56 PM   #2
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I would not pull a vacuum on a glass carboy or demijohn, at least not indoors. Those things aren't really rated for pressure, so the roughly 14psi it would encounter with a deep vacuum pulled on it might be enough to fracture it.

I think some people do use welding cylinder oxygen to oxygenate, as long as it doesn't contain anything else. I've not used it but of course many things that are normally not flammable will burn quite readily in oxygen, and any hint of oil or grease impinging in the line I think can cause a nice energy release.

Right for getting the moisture out of an A/C system it relies on getting the boiling point of the water to be above the ambient temp. So if it is at 70F ambient and you can get the water boiling point lowered to 60F with a deep vacuum then the water in the system will boil off, and if the vacuum is left on for long enough time, it will travel toward the vacuum and then out of the system.

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Old 11-21-2012, 01:52 AM   #3
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What are you talking about? I use a medical vac pump to pull vac on my glass carboys for degassing purposes all the time. Granted, it's probably not as much vac as an HVAC pump might pull, but...

ETA: I would not use welding grade O2 to aerate, though.

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Old 11-21-2012, 02:08 AM   #4
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I'm not saying it would fracture it, I'm just saying right on the packaging it says not for pressurized liquids. Just because someone does something all the time and hasn't yet had a problem with their particular setup doesn't necessarily mean it's safe or is a good idea. Just be aware of the risks and prepare accordingly and then if it ever does implode there will be no personal injury and the liquid will spill say into a rubbermaid container instead of all over the carpet or floor. Granted there is a couple psi of static liquid head when its full but that is less than the roughly -14psig when a deep vacuum is pulled.

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Old 11-21-2012, 06:59 AM   #5
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Why wood you not use welding grade o2? Just a precautionary thing? I'll maybe give it a go with a one gallon batch, all my meads have been fermenting virtuously without it but I just wondered if it would speed it up. The medical vac will be similar. How long do you leave the pump on? Just until the co2 bubbles stop? I'll do it in the bath to be on the safe side. I love brewing in the bath anyway.

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Old 11-21-2012, 01:18 PM   #6
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I recently tried my hand at vacuum degassing using a brake bleeder. According to the gauge I got my one gallon carboy to around 25in. Hg and everything was fine, aside from my forearms. I have now bought a vacuum ejector from Hong Kong and will connect that to my air compressor and achieve about the same vacuum without the sore arms

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Old 11-21-2012, 01:26 PM   #7
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Harbor Freight has the venturi style vacuum things that will run off the air compressor and draw a pretty decent vacuum, not as deep as a refrigeration vacuum pump but not too bad.

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Old 11-22-2012, 01:16 PM   #8
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How long do you leave it under a vacume? Was thinking if I hooked up 2 demijohns, one full one empty I could make a vacume and just leave it with the empty one their to fill with the co2?

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Old 11-22-2012, 01:47 PM   #9
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Quote:
Originally Posted by huesmann View Post
ETA: I would not use welding grade O2 to aerate, though.
This is pretty much what everyone uses, and there's nothing wrong with it...it's a rare brewer who can get their hands on medical grade oxygen! I highly recommend the Williams Brewing oxygenation wand, that you use with this type of welding oxygen cylinder that you can get at any Lowes or Home Depot...

EDIT: for the OP, Williams also sells the aeration wand by itself without the small bottle regulator
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Old 11-22-2012, 10:59 PM   #10
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Ah cool that's good to know. That wand looks like the sort of thing I was thinking of making out of an air stone and some rubber. My oxygen bottles are a bit bigger and have their own trolly but its the same stuff. That's good theirs says 50 seconds so if I blast it gently for a min or two It should do it. I take it oxidation before pitching the yeast only? You would not repeat until this 1/3 sugar break I keep reading about along with staggered nutrients? Just a Goood shake to get some co2 out

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