Barrel 02
Barrel 02 : (1) The body of a fire hydrant. (2) The standard unit of volume for oil measurement widely used for international transactions. The U. S. Barrel (bbl) is equivalent to 42 gallons (U. S. , 35 gallons (U. K. or 159 litres approximately. Loading or discharging rates may be expressed as barrels per hour (bph or bbl/hr). (International Oil Tanker Terminal Safety Group IOTTSG)