I ferment my beers in a pressurized corny keg, as described in WortMonger's thread. This kind of set up seems to offer a particularly efficient way of oxygenating. After I fill the corny and close it up, I can hook up my O2 welding can to one of the posts of my keg and let the thing pressurize to a couple PSI. The trouble is, I really have no sense of quantity here and likewise I don't know what kind of dissolved oxygen numbers I'm getting.
I can do the basic math, but I get stuck:
I fill to about 19L, which leaves me approximately 1.5L of headspace. To hit 12ppm by weight, I need roughly .25g or 0.016 mol of O2.
The trouble is, I don't know where to go from there. I tried looking at the solubility and pressure equations, but they're well above my pay-grade. Is there a reasonably reliable way to calculate the pressure to which I should be filling the headspace with O2, given fixed volumes and temperatures? I'm not looking for razor precision here, but right now I have really no clue what kinds of oxygenation I would be getting.
Thanks in advance for any suggestions!
I can do the basic math, but I get stuck:
I fill to about 19L, which leaves me approximately 1.5L of headspace. To hit 12ppm by weight, I need roughly .25g or 0.016 mol of O2.
The trouble is, I don't know where to go from there. I tried looking at the solubility and pressure equations, but they're well above my pay-grade. Is there a reasonably reliable way to calculate the pressure to which I should be filling the headspace with O2, given fixed volumes and temperatures? I'm not looking for razor precision here, but right now I have really no clue what kinds of oxygenation I would be getting.
Thanks in advance for any suggestions!