Draft Beer Line Balancing
The beer-line length that balances a draft system so it pours right, not foamy or slow: at balance the applied CO2 pressure equals the line restriction (R per foot x length) plus the rise (0.5 psi/ft) plus the faucet (~1 psi), so line = (pressure - 0.5 x rise - 1) / R. A 12 psi system with a 4 ft rise on 3/16" vinyl (3.0 psi/ft) needs 3.0 ft of line. Set the pressure to the carbonation level first, then balance the line; restriction values are nominal per tubing size (3/16" vinyl 3.0, 1/4" 0.85, 3/16" barrier 2.2, 5/16" 0.4 psi/ft). Per the Brewers Association Draught Beer Quality Manual; measure the pour rate and trim.
Formula and source
line_length_ft = (applied_pressure_psi - 0.5 x rise_ft - 1) / R, where R is the tubing restriction (psi/ft): 3/16" vinyl 3.0, 1/4" vinyl 0.85, 3/16" barrier 2.2, 5/16" vinyl 0.4.
Draft-beer line balancing (the Brewers Association Draught Beer Quality Manual system-balance equation), by name; the dispense system and the beer govern.
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