ROSE ROCK MIDSTREAM L.P.

Incident Narrative

THE OKC CONTROL CENTER NOTIFIED THE TECHNICAL SUPERVISOR IN CUSHING OF A LOSS OF COMMUNICATION AT THE GMPL METERING STATION. THE CONTROLLER REPORTED HE HAD SEEN A RISE IN PRESSURE AND DROP IN RATE AT RUBY TERMINAL AND HAD SHUT DOWN THE PIPELINE. THE TECHNICAL SUPERVISOR DISPATCHED AN I/E TECHNICIAN TO THE SITE WHOM REPORTED THAT (1) THE SUMP HAD OVERFILLED CAUSING OIL TO BE RELEASED INTO THE SUMP CONTAINMENT AND (2) THE PLC WAS FOUND IN A NON-FUNCTIONING MODE. TWENTY BARRELS OF OIL WHICH ENTERED THE SUMP ORIGINATED FROM THE THERMAL RELIEF VALVES LOCATED AT THE METER SKID. WITH THE PLC IN A NON-FUNCTIONING STATE, THE SUMP PUMP DID NOT OPERATE NOR DID IT PROVIDE THE HIGH LEVEL ALARM TO SCADA. PERSONNEL WERE DISPATCHED FOR CLEANUP AND TWENTY BARRELS OF OIL WAS RECOVERED FROM THE SUMP CONTAINMENT. THE CONTAINMENT IS EQUIPPED WITH A POLY LINER, SO THERE WAS NO CONTAMINATION OF SOIL. AS A RESULT OF THE ACCIDENT, CHANGES WERE MADE TO THE INPUTS OF THE PLC TO MITIGATE REPEAT FAILURES. IN ADDITION ALL THERMAL RELIEF VALVES ASSOCIATED WITH THE LOW PRESSURE PIPING HAVE BEEN REDIRECTED TO THE LOW PRESSURE RELIEF SYSTEM AND AWAY FROM THE SUMP. FUTURE VOLUMES INTRODUCED INTO THE SUMP WILL BE OF A MANUAL NATURE ONLY. THIS ACTION WILL BE TAKEN SYSTEM WIDE TO ENSURE PLC PROGRAMMING OF CONTROL VALVES WILL KEEP THEIR CURRENT OPERATIONAL STATUS IF THEY BECOME NON-FUNCTIONING WHEN THERE IS A SUBSEQUENT LOSS OF PLC CONTROL OR COMMUNICATIONS.