Exxon reports Beaumont refinery coker upset -filing
HOUSTON, May 22 (Reuters) - Exxon Mobil Corp (XOM.N) took a coker drum out of service at its 348,500 barrel per day Beaumont, Texas, refinery on Friday after a crack was discovered in the drum, according to a notice filed with state pollution regulators.
A coker increases the amount of motor fuel made from a barrel of oil and converts gunky unrefinable residual oil into petroleum coke, a coal substitute, in giant drums that have to function under high heat and high pressure. (Reporting by Erwin Seba; Editing by Gary Hill)










