Ask Mr. Wizard

Tap Line Length


Josh Elvin - Elkford, British Columbia asks,

I use a keezer, and my kegs are standard ball lock corny kegs with the top of the keg being in-line with the taps themselves. I have 4.5 feet (1.4 m) of 3⁄16-inch line, three taps, and I am getting foamy beer out of my taps. I see CO2 bubbles on the start of the line at the keg and at the shank and beer in the middle. I suspect my lines are too long. However, I have posed this question to other homebrewers and have been advised that the lines be a minimum 4.5 feet (1.4 m) long, although none of these replies have shown any math to explain why. Can you please help clarify?

Draft beer dispense problems involving gas breakout, the little bubbles you see in your beer lines, relate to properly balancing your draft set up. All too often, troubleshooting begins by adjusting the
Response by Ashton Lewis.