bovine0001
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Anyone know the psi resistance of stout faucet? That restrictor plate must offer quite a bit and I am trying balance my draft system.
ajdelange said:The pressure drop across a stout faucet will be
dP = (F^2)*(SG)/(Cv)^2
where dP is in psi, F is in gpm, SG is the specific gravity and Cv is the valve flow coefficient which you would have to obtain from the manufacturer or by experiment (put some water in a keg, connect the stout faucet with a short, large bore piece of tubing, dial in some pressure, open the faucet and time the flow with a stop watch).
You set the pressure on the keg according as to the amount of carbonation you want in the beer. This will depend on the amount of CO2 in the mix and the storage temperature (McDantim has some curves/calculators on their website). In an ordinary situation you would then add line until the flow rate when the valve is open is 2 Oz/sec but I don't think you need to do that here as the stout faucets (at least the classic Guiness ones) are equipped with a valve. Since you are going to force the beer through a restrictor plate it shouldn't matter that you throttled it through a valve first. Look up the classic procedure for drawing stout. It should take x seconds to fill the glass 2/3 (I think it is) full. Adjust the valve (or add choker) until you get that flow rate and I think you should be properly set up.
I have my pressure set to 30 to meet the typical 2.5 volumes of co2. I use the charts rather than the calculators and feel this is set correctly. (My chemistry is good enough to understand basic partial pressure math).
I will hunt for that procedure, though it thus far is not easy to find on google. It seems like its slam it open and fill 3/4 and wait. Then crack it open to put the head.
When you say adjust valve, do you mean open it up differently? I feel like it is open or closed.
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