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their entire length at about the same temperature as
the beer in the cooler. Most manufacturers of these
systems agree that it is not possible to adequately
refrigerate these lines using cold air over distances
greater than about 15 ft (4.6 m). Therefore, these
systems utilize a liquid refrigerant line continuously
cycling propylene glycol at a temperature below 30°F
(-1.1°C) (or other suitable liquid coolant) in physical
contact with beer lines and with the overall assembly
contained in a flexible, insulated housing. These
systems, when properly designed and installed,
generally offer the best and most consistent draught
beer product. On the other hand, an improperly
designed, installed, or maintained system (even a
rough or damaged gasket) can produce “shots” of
foam, continuous foam, or continuously warm and
therefore, foamy beer.
NOTE: A properly designed, installed, and maintained
draught dispensing system should deliver beer at 1.75
to 2.0 ounces per second. The beer should be
dispensed at 38°F (3.3°C) or less. The beer should
flow in a solid, clear column smoothly (neither falling or
pushing) from the faucet to the glass.
STH13_Tech.book Page 17 Wednesday, September 15, 2010 3:20 PM