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Old 06-14-2010, 02:15 AM   #1
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Default bit of a foaming issue

Keeping my keezer about 36-38 degrees. Its a small keezer and there is only about 8" rise from the top of the kegs to the taps. I am using 6' of 3/16 line on both kegs. I am set on 12lbs and carbed the beer that way (set and forget on 12lbs). Im getting about 1/3 foam when i pour. I have ordered more beer line to arrive tomorrow so that I can switch up to 12' lines if needed. I have tried varying the pressure and didnt get much change. I have read about not having any dips in the line, and Im wondering if this is my issue. my lines do initially run down next to the kegs and then straight up to the taps. Should i find a way to coil my lines on top of the kegs to avoid the dip at the bottom? Is there something else I may be missing. If it matters Im using perlicks with 4 inch shanks and an instant read thermometer shows my beer about 39 degrees in the glass.

Mike in Duluth

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Old 06-14-2010, 03:36 AM   #2
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I think you'll be good with about 10' of line and keeping it above the kegs as you mentioned.

I also want to point out that glass choice makes a big difference. I'm not saying you don't know how to pull a pint correctly, but most people who use my kegerator seem to get lots of foam. Yet, when I pull a pint, I get the perfect amount. I blame it on glass angle and shape most of the time. Tall skinny glasses seem to foam more than a wide snifter-like glass.

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Old 06-14-2010, 03:49 AM   #3
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Try this experiment. Take two glasses in there and pour the first one, foam and all till it's about half full. Grab the other glass and pour immediately to see if there are any foaming issues. If your second glass pours correctly, your issue is with tower temperature. This happened to me.

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Old 06-14-2010, 08:40 AM   #4
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Quote:
Originally Posted by Ricand View Post
Try this experiment. Take two glasses in there and pour the first one, foam and all till it's about half full. Grab the other glass and pour immediately to see if there are any foaming issues. If your second glass pours correctly, your issue is with tower temperature. This happened to me.
+1, unless your tower is cooled you will get foam on your first pour, just a fact of life, warm beer foams.
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Old 06-14-2010, 10:56 AM   #5
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+1, unless your tower is cooled you will get foam on your first pour, just a fact of life, warm beer foams.
I will try this after work today, if it makes a difference I have a collar (no tower).

Mike in Duluth
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Old 06-14-2010, 11:37 AM   #6
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Hello, i have almost the exact same set up and am having the same problem. It looks as if the beer is turning to foam in the beer line right before it connects to the shank. I tried continuosly pouring as stated above but it didnt work. I have been asking around but cant find any answers.

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Old 06-14-2010, 12:43 PM   #7
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Think i figured it out. Please let me know if you agree.

According to "balancing your draft system". 3/16" line puts approximatly 3psi of restriction on the line and lift is eqaul to .5 psi. if this is the case and we are dispensing at 12 PSI in the keg with 6'-0" of 3/16" beer line then we would actually be losing too much PSI in the line and thus foaming before reaching the tap.

required psi for dispensing = 2 to 3 psi at tap

12PSI - 2PSI for lift (4'-0" in my system) = 10 psi

10PSI - 18PSI for 6'-0" of beer line = -8PSI

way too low i am assuming according to the calculation of 3PSI of pressure restriction per foot of 3/16" hose.

I dont understand why im getting good flow at the tap but it is all foam coming out.

Anyway, based on the calculation, i would need a maximum of 2.66 feet of beer line for 2PSI of pressure at the tap. I just hope i can reach the tap with this lenght of hose. I am going to try this when i get home.

Please let me know if anyone agrees / disagrees. 3PSI of restriction per foot seems a bit much to me but we shall see.

Thanks,
Dustin Hickey

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Old 06-14-2010, 12:58 PM   #8
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Dustin...Your math is fuzzy.... you need to go longer.
12PSI(keg Pressure) - hose loss= pressure drop at the tap.

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Old 06-14-2010, 01:03 PM   #9
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Here is the formula I found

12.3 PSI = Length * Resistance (2.7 psi per foot) + Height * 0.5
12.3 PSI = 4 feet * 2.7 + 3 feet * 0.5
12.3 PSI = 10.8 + 1.5
12.3 PSI = 12.3

by doing the above calculation with length of run set at 4' i see that 12.3 PSI would be correct. By simply adding 2 addtional feet of line (making it 6 feet) we see that we would need 17.7 psi in the keg for the proper pressure at the tap.

That being said. I am going to remove 2'-0" of beer line from my system when i get home and give er a go. Will post results.


-Thanks,
Dustin Hickey

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Old 06-14-2010, 01:11 PM   #10
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Quote:
Originally Posted by schmagy View Post
Dustin...Your math is fuzzy.... you need to go longer.
12PSI(keg Pressure) - hose loss= pressure drop at the tap.
Your right, i was a bit off because the hose loss is actaully 2.7 instead of 3. but the basic concept was correct.

12 psi - 2.7 x 6' ( hose loss ) = -4.2 without even adding height to the equation.

see calculation above. I need 4'-0" of hose to get approximatley 2 or 3 psi at tap with 3'-0" lift.
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