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Because the keg system uses pressure to force the beer up and out of the keg, these taps must have a means of supplying it. The typical "picnic tap" uses a hand pump to push air into the keg; this will cause the beer to spoil faster but is perfectly acceptable if the entire keg will be consumed in a short time.
In common parlance, the term keg refers to a half-barrel (15.5 U.S. gallon) vessel as this is the most common size used in restaurants, bars and limited home use. A quarter-barrel has a volume of 7.75 U.S. gallons. Generally, a keg is a vessel smaller than a barrel; thus, it is 30 gallons or smaller. [4]
A crucial part of any draft beer system is the keg coupler, the part inside the kegerator that taps the keg. Different types of kegs require different keg couplers, [3] so considering what you plan on serving is important in order to purchase the appropriate coupler. System D (U.S. Sankey) – standard for North American beer
Pressurised CO 2 in the keg's headspace maintains carbonation in the beer. The CO 2 pressure varies depending on the amount of CO 2 already in the beer and the keg storage temperature. Occasionally the CO 2 gas is blended with nitrogen gas. CO 2 / nitrogen blends are used to allow a higher operating pressure in complex dispensing systems.
A Cornelius keg is a stainless steel cylinder typically rated for a maximum pressure of 130 pounds per square inch (9.0 bar). There are three openings in the keg: a large central hole for cleaning and filling, and two ports for pressurizing and dispensing.
Draught (also spelled "draft") beer from a pressurised keg using a lever-style dispenser and a spout is the most common method of dispensing in bars around the world. A metal keg is pressurised with carbon dioxide (CO 2) gas which drives the beer to the dispensing tap or faucet. Some beers may be served with a nitrogen/carbon dioxide mixture.
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