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Restriction (pounds per square inch)
Restrictor Line:
3/16" ID @ ft=3.0 psi
Beer Supply Line:
3/8" ID @ ft=0.07 psi
8. Determine the lift or drop restriction by taking the
total vertical lift in feet and subtracting the total
vertical drop in feet and multiplying the remainder
by 0.5 psi.
Add 1/2 psi for every foot of vertical lift. Subtract
1/2 psi for every foot of vertical drop.
Equal lifts and drops cancel one another.
Example:
13 ft lift - 8 ft drop = 5 ft of lift
5 ft of lift x 0.5 psi = 2.5 psi lift*
*This figure will be negative if the drop exceeds
the lift.
9. Determine the total line restriction by adding each
of the previously calculated restriction factors.
Example:
3.5 psi (length of run restriction) + 2.5 psi (lift/drop
restriction) = 6.0 psi (total line restriction)
10. Determine the required psi of restriction that will
be required by taking the Applied Keg Pressure
and subtracting the Total Line Restriction.
Example:
14.5 psi (applied keg pressure) + 6.0 psi (total line
restriction) = 8.5 psi (restriction factor)
If this figure is greater than or equal to 6.0 psi
proceed to the instructions outlined in step A.
below. If this figure is less than 6.0 psi proceed to
the instructions outlined in step B. below.
A. To convert the psi of restriction needed to
inches of required 3/16" ID restriction line,
use the following equation:
Number psi needed ÷ 0.25 psi = number of inches
of restrictor
STH13_Tech.book Page 51 Wednesday, September 15, 2010 3:20 PM