CENTURION PIPELINE L.P.

Incident Narrative

ON JANUARY 20, 2019, AT APPROXIMATELY 11:11 AM, A COMPANY AERIAL PATROL REPORTED A POTENTIAL RELEASE NEAR A CENTURION PIPELINE COMPANY L.P. (CPL) RIGHT OF WAY. AT APPROXIMATELY 11:52 AM A CPL EMPLOYEE IDENTIFIED A LEAK AT THE BINGER STATION NEAR BINGER, OKLAHOMA, IN CADDO COUNTY, OKLAHOMA. CPL IMMEDIATELY SHUT STATION VALVES TO ISOLATE THE RELEASE. THE RELEASE WAS FLOWING FROM A 0.5-INCH VENT ON THE BELLOWS TYPE PSV. APPROXIMATELY 150 BARRELS OF CRUDE OIL WERE RELEASED. ALL OIL WAS RECOVERED WITH 120 BARRELS BEING RECOVERED IN LIQUID FORM WHILE 19 BARRELS IN SOIL HAVE BEEN MOVED TO AN OFFSITE LOCATION FOR REMEDIATION. ONE BARREL IS ESTIMATED TO HAVE REACHED GROUND WATER AND HAS BEEN RECOVERED. NO INJURIES, FATALITIES, OR FIRES WERE ASSOCIATED WITH THIS ACCIDENT. THE NATIONAL RESPONSE CENTER (NRC) REPORT NUMBER CORRESPONDING TO THE UPDATES CONCERNING THIS ACCIDENT IS 1235839. THE PRELIMINARY ROOT CAUSE ANALYSIS OF THE FAILURE HAS DETERMINED THAT MULTIPLE CHECK VALVE FAILURES LED TO THE SUCTION SIDE OF THE PUMP AND THE ASSOCIATED RELIEF VALVE BELLOWS SEEING PIPELINE PRESSURES WHILE NOT IN OPERATION. THIS LED TO THE DEFORMATION AND PREMATURE FAILURE OF THE RELIEF VALVE BELLOWS. HOWEVER, WHEN THE FINAL ROOT CAUSE ANALYSIS IS COMPLETE A SUPPLEMENTAL REPORT WILL BE FILED ACCORDINGLY. SUPPLEMENTAL REPORT FILED 5/30/2019 THE ROOT CAUSE FAILURE INVESTIGATION HAS DETERMINED THAT MULTIPLE CHECK VALVE FAILURES LED TO THE SUCTION SIDE OF THE PUMP AND THE ASSOCIATED RELIEF VALVE BELLOWS EXPERIENCING PIPELINE PRESSURES WHILE NOT IN OPERATION. THIS LED TO THE DEFORMATION AND PREMATURE FAILURE OF THE RELIEF VALVE BELLOWS. THE ROOT CAUSE OF THE FAILURE, THE CHECK VALVE FAILURE, WAS DETERMINED TO BE EXCESSIVE VIBRATION. NEW DAMPENERS HAVE BEEN INSTALLED TO REDUCE FUTURE VIBRATION AND PREVENT AN INCIDENT REOCCURRENCE. ADDITIONALLY, NEW RELIEF VALVES HAVE BEEN INSTALLED WITH A NEW PIPING CONFIGURATION TO PREVENT SIMILAR CONSEQUENCES IN THE FUTURE. WHILE THESE CHANGES DO NOT ADDRESS THE ROOT CAUSE CHECK VALVE FAILURE, THE CHANGES DO REDUCE THE CONSEQUENCES OF POTENTIAL FUTURE SYSTEM UPSETS. CPL WILL EXAMINE THE PIPELINE SYSTEM FOR SIMILAR INSTALLATIONS AND TAKE APPROPRIATE MITIGATIVE ACTIONS.