What is the oil drums?

Barrel is a unit of the US measure of the amount of oil total quantity of 159 liters or 42 gallons, is worth mentioning that the barrel of any other means of non-oil estimated at 35 gallons only, unlike common are no longer used the barrels to store oil that is pumped through the pipes to the huge tanks, and then to oil tankers tanks that are discharged in the consuming countries in large tanks.

The reason for the prevalence of the use of drums is that when oil was discovered in commercial quantities in northwestern Pennsylvania is stored in casks of wine and beer to facilitate the process of being transferred to the horse-drawn carriages or on the river phrases.