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The task of converting a standard barrel of oil to a standard cubic metre of oil is complicated by the fact that the latter is defined by the API to mean the amount of oil that, at different reference conditions (101.325 kPa and 15 °C (59.0 °F)), occupies 1 cubic metre. The fact that the refence conditions are not exactly the same means that ...
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] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b] then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (277.4 cu in), the imperial gallon is close in size to the old ale gallon.
The standard size barrel of crude oil or other petroleum product (abbreviated bbl) is 42 US gallons (35.0 imp gal; 159.0 L). This measurement originated in the early Pennsylvania oil fields , and permitted both British and American merchants to refer to the same unit, based on the old English wine measure, the tierce .
See Weight for detail of mass/weight distinction and conversion. Avoirdupois is a system of mass based on a pound of 16 ounces, while Troy weight is the system of mass where 12 troy ounces equals one troy pound. The symbol g 0 is used to denote standard gravity in order to avoid confusion with the (upright) g symbol for gram.
The general standard for liquids is 31.5 gal or half a hogshead. The common 55-gallon size of drum for storing and transporting various products and wastes is sometimes confused with a barrel, though it is not a standard measure. In the U.S., single servings of beverages are usually measured in fluid ounces.
Metric regions commonly use the tonne of oil equivalent (toe), or more often million toe (Mtoe). Since this is a measurement of mass, any conversion to barrels of oil equivalent depends on the density of the oil in question, as well as the energy content. Typically 1 tonne of oil has a volume of 1.08 to 1.19 cubic metres (6.8 to 7.5 bbl).
The tierce (also terse) is both an archaic volume unit of measure of goods and the name of the cask of that size. [1] The most common definitions are either one-third of a pipe or forty-two gallons. In the petroleum industry - a barrel of oil is defined as 42 US gallons.