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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]
Both the 42-US-gallon (159 L) barrels (based on the old English wine measure), the tierce (159 litres) and the 40-US-gallon (150 L) whiskey barrels were used. Also, 45-US-gallon (170 L) barrels were in common use. The 40 gallon whiskey barrel was the most common size used by early oil producers, since they were readily available at the time.
As with the hogshead, the ale barrel underwent various redefinitions. Initially 32 ale or beer gallons (147.9 L), it was redefined in 1688 as 34 ale or beer gallons (157.1 L), and again in 1803 as 36 ale or beer gallons (166.4 L). barrel (Beer) The beer barrel was defined as 36 ale or beer gallons until the adoption of the imperial system.
Earlier, another size of whiskey barrel was the most common size; this was the 40 US gallons (33.3 imp gal; 151.4 L) barrel for proof spirits, which was of the same volume as five US bushels. However, by 1866, the oil barrel was standardized at 42 US gallons.
The major wine producing countries use barrels extensively and have developed standards at variance with the traditional English volumes: examples include a hogshead of 300 L (66 imp gal; 79 US gal), a barrique of 220 L (48 imp gal; 58 US gal) (Bordeaux), a barrel of 225 L (49 imp gal; 59 US gal) (Australia), a barrel of 230 L (51 imp gal; 61 ...
5.16 US gal.-Sixth of a US beer barrel. pony keg: 29.33 L: 7.75 US gal-1 ⁄ 4 US beer barrel. anker (US) 37.85 L: 10 US gal: 8.33 imp gal: An obsolete Dutch measurement, originally used for a small cask of wine or brandy. It was brought to the New World by the former Dutch colony of Nieuw Amsterdam (renamed to New York City by the English in ...
A standardized hogshead measured 48 inches (1.22 m) long and 30 inches (76.20 cm) in diameter at the head (at least 550 L or 121 imp gal or 145 US gal, depending on the width in the middle). Fully packed with tobacco, it weighed about 1,000 pounds (454 kg) [ citation needed ] .
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.