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Old 01-27-2013, 03:25 AM   #1
Feb 2012
Acushnet, MA
Posts: 30
Liked 1 Times on 1 Posts

So I kegged my Gratzer earlier this week and carbed to the recommended 3.6 volumes, which gives me a head pressure of about 24psi. I ordered a 3/16 polyethylene draft line that is 11' long, the manufacturer lists line resistance as 2.2psi/ft. I'm dispensing with a cobra tap that stays in the fridge. The equation I am using for calculating draft line length is as follows:

Length = keg pressure (24) -1 (apparently cobra taps create about 1psi of resistance) / line resistance (2.2 psi/ft). There is no elevation to take into account. So, the equation should be

Length = (24 - 1)/2.2 = 10.45.

I cut my line to 10.5', I am using a ball lock, 1/4" flared fitting and just crammed the line over it. The line is coiled up into a roughly 1' circle, and is sitting more of less on top of the keg.

All seems well on paper, but the beer shoots out of the draft line like a fire hydrant! Did I miss something? This will be the first time I've tried kegging a highly carbonated beer so I'm a bit lost. Does anyone else have experience with this?

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Old 01-27-2013, 04:03 AM   #2
Aug 2011
Chesterfield, MO
Posts: 1,652
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i haven't had much luck calculating tube lengths. i serve my wit bier with a 20' beer line and it's just barely enough. there are some threads around about using an epoxy stirrer in the dip tube for additional restriction. that may be worth a look.

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Old 01-27-2013, 04:16 AM   #3
JuanMoore's Avatar
Oct 2009
The Old Pueblo
Posts: 22,378
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All of those balancing equations/calculators are only applicable when serving beer very cold and close to the carb level of commercial beers. One of the main reasons for this is that line resistance isn't a fixed number for a given line, but actually varies depending on fluid velocity. As mentioned above, you're going to need to add a lot of line resistance for a beer carbed that highly. Either really long lines, epoxy mixer sticks in the diptube, a flow control faucet, or combination of the above. Also, poly lines offer significantly less resistance than vinyl, FWIW.
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Old 01-31-2013, 01:33 AM   #4
Jan 2013
Boston, Mass
Posts: 73
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Use this
This is great. I used it ( commercial kegs) and it worked perfect. I'm sure it would work for home brew as well
This is the carb chart as well
I have a 1/6 keg of sam adams alpine spring at 12 psi with 9' of 3/16" id beer line and all is well.

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