foaming

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foaming

Postby dcos » Mon Mar 08, 2010 5:13 pm

My 5 gal Cornelius keg foams more than I'd like. I have it in a mini fridge at about 32 degrees, serving pressure about 10, about 6 feet of serving hose. I get at least 1/4 to 1/2 glass of foam when I pour one. Anyone have any suggestions?
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Postby jawbox » Mon Mar 08, 2010 7:19 pm

Whats the inside diameter of the tubing you are using? Are you using cobra taps or a regular faucet?
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Postby jawbox » Mon Mar 08, 2010 8:29 pm

Here's a great pdf for you to read. There's a section on balancing your draft system.

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Postby dcos » Tue Mar 09, 2010 8:29 am

I'm using Bevflex 200 tubing, not sure of the ID, but it's probably 1/4 inch. I have a regular faucet on it.
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tubing length and foam

Postby slothrob » Tue Mar 09, 2010 2:33 pm

If it's actually 1/4" tubing, you need a longer run.

You can use this formula to calculate the length of tubing to use:

Length = (Pressure - (Height of tap from center of keg x 0.5) - 1) / Resistance

Resistance is about 0.7 psi/ft (0.4-0.85) for 1/4" i.d. and 1.8-2.7 for 3/16" i.d. plastic tubing.

If your tap is ~ 2 feet above the keg, for 10 psi you should need 12-25 feet of 1/4" tubing. For 3/16" tubing you should need 4-6 feet of line. No one ever seems to need the low end of those lengths and they sometimes need longer than the top end.

It's often suggested that you start with the longest suggested length of line required for your serving pressure, some even add 5 psi to their serving pressure for making the calculation. You can then trim if the beer is running too slow. The flow rate should be ~100-140 ounces per minute, so it should take 8-10 seconds to fill a pint.
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