HOUSTON, Jan 19 (Reuters) - Royal Dutch Shell Plc's 316,600 barrel per day (bpd) joint-venture refinery in DeerPark, Texas, was shutting the 92,000 bpd delayed coking unit onTuesday for a planned overhaul, sources familiar with plantoperations said.
The Deer Park plant shut the refinery's 40,900 bpd gas oilhydrotreater earlier in the day as part of the planned work,according to energy industry intelligence service Genscape.
The work on the coker, which boosts the amount of refinablematerial taken from a barrel of oil, is scheduled to last aboutthree weeks, the sources said. The hydrotreater is expected tobe shut the same amount of time. A coker gets its name from thepetroleum coke it produces from residual crude.
The Deer Park refinery is a joint venture between Shell andPetroleos Mexicanos, the Mexican national oil companybetter known as Pemex. (Reporting by Erwin Seba; Editing by Sandra Maler)