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Home Brew Forums > Home Brewing Beer > Equipment/Sanitation > Stout faucet - what's the concept?
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Old 01-15-2014, 04:48 PM   #21
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A 5lb co2 tank filled with beergas will push one, maybe two kegs. The smallest nitrogen tank generally recommended for this purpose is 20cf, which can push around 4 kegs and is physically similar in size to a 10lb co2 tank. I went with 80cf which I haven't emptied yet.
I'm on my fifth keg with the 5lb bottle, and haven't refilled it yet. Not sure where you're getting your info from.
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Old 01-15-2014, 05:06 PM   #22
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That's about right. 6 Cornies is two half barrels (kegs) and a 5 lb CO2 tank full of mix will push about 2 kegs. A bottle of mix is full of gas. A bottle of CO2 is full of liquid. It holds a lot more by mass. A bottle of mix is like a bottle of CO3 after all the liquid is vaporized. When the needle starts to drop you can go another keg or two (depending on the pressure you use) before you are out.

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Old 01-15-2014, 07:54 PM   #23
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Do you really mean 'nitrogen tank' or do you mean a blend tank?
I mean a gas blend in a high pressure tank that has the fitting generally used for nitrogen. I have heard that some places use co2 tanks for beergas, but usually it's a nitrogen tank, I forget the actual name of the fitting. As you've mentioned a gas blender is not realistic for most homebrewers.
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Old 01-15-2014, 07:59 PM   #24
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I'm on my fifth keg with the 5lb bottle, and haven't refilled it yet. Not sure where you're getting your info from.
I'm getting my info from searching this site. I read up a lot before taking the plunge myself. The relevant posts I was able to find seemed to indicate that most people were getting 3 kegs from a 20cf tank of beergas, 4 if they naturally carbonate in the keg beforehand. If you're getting more, that's cool.
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Old 01-16-2014, 01:51 PM   #25
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A lot of bad information here. As some others have said, Nitrogen will not go into the beer at any appreciable amount, it is only used to push the beer through the tap. The tap itself has a restrictor disk, if you tried to serve with just CO2 at standard carbonating pressure (say 8 psi for a stout) the disk provides enough resistance that you'd only get the smallest trickle from the tap.



In order to force the beer through that disk, you need much higher pressure backing it around 25 psi. If you were to do this with CO2 alone, it would way over carbonate the beer at that pressure.



Because of nitrogen's inability to so into solution (well, it does, but at these pressures and temperatures it is negligible) it becomes a perfect option for pushing beer with a lot of pressure without causing issues.



Beer gas is a mixture of co2 and nitrogen. Basically, a pressure is chosen that will cause the co2 to carbonate the beer, and the nitrogen to push. There's some thermodynamics here (henry's law, dalton's law), but suffice to say this is the best option. Serving a beer with pure nitrogen can cause it to go flat eventually. This seems a bit counterintuitive, because people want to believe that the nitrogen holds the co2 in solution, but it is not the case (see aforementioned laws).



But why do we need that pressure? The faucet restrictor disk degasses the beer slightly and produces a thick creamy head. Do you need a stout tap? Maybe. You can actually get the same effect with a syringe, so maybe give that a try and see how you like it

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Old 01-16-2014, 04:16 PM   #26
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In order to force the beer through that disk, you need much higher pressure backing it around 25 psi. If you were to do this with CO2 alone, it would way over carbonate the beer at that pressure.
That's why, as I pointed out in #20, you store the beer at 1 psig CO2 and raise the CO2 pressure to 32 only when serving restoring to 1 when finished. Doing that gives you all the benefits of your stout faucet w/o having to fiddle with gas blends or nitrogen. Of course it's a PITA to be bleeding and pressurizing every time you want a glass of stout. A blender is much more convenient.
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Old 01-16-2014, 04:58 PM   #27
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Some of my keg lids leak below 5 psi or so. I know that's not the point, but it's probably something to consider for many. Be sure to check for leaks if you plan on going with that method.

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Old 01-16-2014, 05:54 PM   #28
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It certainly would be. It's been years since I used Corny's and had thus forgotten about that annoying aspect of them. The problem is that the O-rings get hard with cold and age. The solution is a soft silicone O-ring but the bloody things were about $19 apiece years ago when I looked at them (IIRC and it's been a few years). I wonder how long it will be before home brewers discover Petainers - the 'one way kegs' which are finding their way onto the craft brewing scene.

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Old 01-16-2014, 06:07 PM   #29
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There's a thread somewhere on here about those, they look promising for sure. I would take a serious look if I was just getting started with kegging.

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