MEDALLION OPERATING COMPANY, LLC

Incident Narrative

SUPPLEMENT - 2020-04-27 UPDATED TO PROVIDE ADDITIONAL DETAILS OF COVERED TASKS WERE PERFORMED DURING MAINTENANCE ACTIVITIES, CLARIFYING INVESTIGATION AND PLAN OF CORRECTION HAVE BEEN COMPLETED AND TO CLARIFY WHY THE OPERATIONS PERSONNEL WAS NOT TESTED FOR DRUGS/ALCOHOL. ON FEBRUARY 28, 2020 AT 0730 LOCAL OPERATIONS PERSONNEL ARRIVED AT THE MIDLAND JUNCTION STATION TO PREPARE TO ISOLATE, DRAIN, REMOVE AND REPLACE A SECTION OF PIPING. AT 0800 LOCAL OPERATORS BEGAN TO ISOLATE THE SECTION OF PIPING. LOCAL OPERATORS PHONED THE CONTROL CENTER TO CLOSE ESD-16320, AN ACTUATED FAIL CLOSED VALVE, ACCORDING TO STATION P&IDS. AFTER CONFIRMING THE VALVE CLOSURE, LOCAL OPERATORS THEN ISOLATED THE PNEUMATIC AIR SUPPLY TO ESD-16320 TO PREVENT ACCIDENTAL OPERATION OF THE VALVE. DURING THE UNBOLTING OF THE PIPING SECTION ESD-16320 BEGAN TO OPEN DUE TO LOSS OF PNEUMATIC AIR SUPPLY PRESSURE ON THE ACTUATING DEVICE, ALLOWING CRUDE OIL TO LEAK FROM THE LOOSENED SECTION OF PIPE 10:47, LOCAL TIME. LOCAL OPERATORS IMMEDIATELY BEGAN CLOSING HAND OPERATED VALVES TO STOP THE FLOW OF OIL TO THE AFFECTED PIPING AND SECURING THE FACILITY. THE REST OF THE STATION REMAINED IN SERVICE. LOCAL OPERATIONS PERSONNEL NOTIFIED MANAGEMENT AND EHS AT 10:50. ONCE IT WAS DETERMINED SAFE, THE MAINTENANCE ACTIVITY WAS COMPLETED AND THE STATION WAS RETURNED TO FULL SERVICE AT 1230 LOCAL TIME. THE INVESTIGATION FOUND THE LOCAL OPERATORS FOLLOWED PROCEDURE TO ISOLATE THE SECTION OF PIPING, BUT THAT ESD-16320 WAS MISIDENTIFIED ON THE P&IDS AS A FAIL CLOSED VALVE INSTEAD OF A FAIL OPEN VALVE. SINCE THE DRAWINGS INCORRECTLY INDICATED THE VALVE FAILURE STATUS, MEDALLION DETERMINED THE OPERATORS PERFORMANCE DID NOT PLAY A ROLE IN THE RELEASE AND THE OPERATORS WERE NOT DRUG OR ALCOHOL TESTED. TO PREVENT RECURRENCE MEDALLION HAS CORRECTED THE SITE DRAWINGS TO REFLECT THE ACTUAL CONDITION AS-BUILT, THAT THE VALVE IS A FAIL-OPEN VALVE.