HOUSTON, Nov 5 (Reuters) - BP Plc was restarting the102,000 barrel-per-day (bpd) coking unit on Wednesday at its413,500 bpd Whiting, Indiana, refinery, said sources familiarwith operations at the refinery.
The coker shut down overnight, the sources said. Theshutdown was unplanned and refinery officials were attempting todetermine the cause of the shutdown.
Energy industry intelligence service Genscape said decreasedactivity was seen on the unit on Tuesday.
A BP spokesman declined to discuss operations at therefinery.
A coking unit refines residual crude into feedstocks orconverts the gunky oil into petroleum coke, which can be used asa coal substitute. (Reporting by Erwin Seba; Editing by Chizu Nomiyama)