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Old 03-18-2010, 11:59 AM   #1
tfetter
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Feb 2010
berwick,pa.
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my homemade draft system foams and spits on first pull of tap,but settles after 3-4 seconds, then it pours perfect,then after sitting for maybe 10 minutes it does the hole thing again. i have replaced beer lines ,facet,shank, beer keg is in basement,in fridge,temp. reads 30deg. line runs are,10feet 5/16,4feet 3/16 and rise is 7-9foot,all line is insulated with 1/2 inch pipe insulation

 
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Old 03-18-2010, 12:02 PM   #2
tfetter
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Feb 2010
berwick,pa.
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sorry about the copy message,i am new to forum writing,submitting etc.

 
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Old 03-18-2010, 12:41 PM   #3
nostalgia
 
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Feb 2008
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Quote:
Originally Posted by tfetter View Post
in fridge,temp. reads 30deg.
Is this a typo? That's awfully cold to be storing your beer. Maybe you're getting some frozen beer in the lines at the first pull after it's been sitting for 10 minutes.

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Old 03-18-2010, 01:35 PM   #4
llenrocs
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Jun 2009
Central IL
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I would guess that you are getting the CO2 coming out of solution due to the pressure loss in a 7-9 foot vertical rise. The temperature rise in the line could also be contributing to the problem. What is the pressure in your keg?
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Old 03-18-2010, 01:48 PM   #5
Mischief_Brewing
 
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My guess would be warm lines. Just insulating them will not necessarily keep them cold. Most people will run some sort of cooling system (air cooled with a fan blowing into tubing with the lines or a glycol/water/or mix of the two system being run by a pond pump).

I agree with the other responses, 30 seems a bit too cold, but shouldn't be the primary cause of the foaming. Warm lines due to the length of run would be my bet.

 
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Old 03-18-2010, 02:36 PM   #6
llenrocs
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Jun 2009
Central IL
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A 9ft vertical rise equates to a 4 psi pressure loss. So if your keg is at 12 psi, then the tap is at 8 psi (without any flow) - you will get a significant amount of CO2 coming out of solution. The warmer temperature of the lines also contributes to carbonation loss.

Cooling the lines won't make the problem go away completely.
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