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The barrel of oil equivalent (BOE) is a unit of energy based on the approximate energy released by burning one barrel (42 US gallons, 35 imp gal or about 159 litres) of crude oil.
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.
Although crude oil is sometimes shipped in 55-US-gallon drums, the measurement standard of oil in barrels is based on the whiskey containers of the 1870s that measured 42 US gallons (35 imp gal; 159 L). [12] The measure of 42 US or wine gallons corresponds to a wine tierce (third-pipe). A wine barrel, or 1 ⁄ 8 tun, measures 31.5 US gallons ...
Wine was measured with units based on the wine gallon of 231 cubic inches (3.785 L), beer was measured with units based on an ale gallon of 282 cubic inches (4.621 L) and grain was measured with the Winchester measure with a gallon of approximately 268.8 cubic inches (one eighth of a Winchester bushel or 4.405 L). In 1824, these units were ...
Volume Unit of measure cubic metre litre Reference size Usage 1 cubic metre = 1 = 1000: base unit in SI : 1 barrel = 0.158 987 294 928 = 158.987294928 = 42 US gallons = 9,702 cubic inches
barrel: oilbbl bbl 42 US gal 1.0 bbl (0.16 m 3) US beer barrel: USbeerbbl (usbeerbbl) US bbl 1.0 US bbl (120 L; 31 US gal; 26 imp gal) U.S.beerbbl (usbeerbbl) U.S. bbl US gallon: USgal US gal 231 cubic inches by definition, also 4 US qt or 8 US pt or 128 US fl oz Allows triple output units. See: full list. 1.0 US gal (3.8 L; 0.83 imp gal)
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Historically a beer barrel was a standard size of 36 US gallons (140 L; 30 imp gal), as opposed to a wine barrel of 32 US gallons (120 L; 27 imp gal), or an oil barrel of 42 US gallons (160 L; 35 imp gal). Over the years barrel sizes have evolved, and breweries throughout the world use different sized containers.