A 200-litre drum (known as a 55-gallon drum in the United States and a 44-gallon drum in the United Kingdom) is a cylindrical container with a nominal capacity of 200 litres (55 US or 44 imp gal).
Why are oil barrels 55 gallons?
Rockefeller's Standard Oil, in 1905 Nellie Bly designed a solution to the crummier containers. ... The unit “barrel” was still 42 gallons while the container was 55, so the 55 gallon steel drum kept being pushed farther and farther away from the industry that invented it.2017-09-28