ENLINK PERMIAN, LLC

Incident Narrative

ON 3/29/2023, AT APPROXIMATELY 8:36 PM, A CRUDE PIPELINE CONTROLLER SWITCHED FROM ONE DELIVERY POINT (GREY OAK) TO THE EL DORADO CRUDE STATION ""ON THE FLY,"" DIVERTING FLOW WITHOUT LOWERING PRESSURES OR FLOWRATE. THIS METHOD IS NOT IN ALIGNMENT WITH CONTROL ROOM PROCEDURE AND TRAINING, WHICH REQUIRES A CONTROLLER TO LOWER FLOWS AND PRESSURES BEFORE TRANSITIONING TO A NEW DELIVERY POINT. THE RESULT WAS A HIGH-PRESSURE CONDITION OCCURRING ON THE CHICKADEE TRANSMISSION LINE UPSTREAM OF THE EL DORADO STATION'S INLET PIPING. THIS TRIGGERED THE STATION'S INLET CONTROL VALVE TO CLOSE PER LOGIC HIGH-PRESSURE ALARM PROGRAMMING PARAMETERS AT APPROXIMATELY 8:38 P.M. ENLINK BELIEVES THAT THIS HIGH-PRESSURE EVENT CAUSED THE FAILURE OF THE FILTER POT DOWNSTREAM OF THE MOTOR-OPERATED INLET CONTROL VALVES, WHICH DID NOT CLOSE QUICKLY ENOUGH IN THE EVENT OF SUCH A SUDDEN PRESSURE SPIKE. THE INLET FILER POT LID CRACKED IN HALF, SEPARATING FROM THE FILTER POT'S PRIMARY CASING, ALLOWING CRUDE OIL TO FLOW FREELY ONTO THE GROUND. THE CONTROLLER RESET THE STATION AND RESUMED FLOW AT APPROXIMATELY 8:52 P.M. ALTHOUGH ENLINK'S LEAK DETECTION ALARMS OPERATED PROPERLY AND IDENTIFIED A POTENTIAL LEAK AFTER RESUMING FLOW, THE SAME OPERATOR, AFTER ACKNOWLEDGING A LEAK DETECTION ALARM, DID NOT PROPERLY INVESTIGATE OR ESCALATE THE ALARM IN A TIMELY MANNER, AS REQUIRED BY ENLINK PROCEDURE. THIS RESULTED IN CONTINUED FLOW IN THE AMOUNT OF APPROXIMATELY 9,583 BBLS THROUGH THE CRACKED LID UNTIL THE STATION WAS SHUT DOWN AT APPROXIMATELY 11:26 P.M. NOTIFICATIONS WERE MADE TO TEXAS RRC, TCEQ, AND NRC. NO FIRES OR INJURIES RESULTED FROM THIS EVENT. THERE HAVE BEEN NO IMPACTS TO WATERWAYS OR GROUND WATER. THERE WERE 720 BBLS OF FREE PHASE OIL ORIGINALLY RECOVERED, 8863 BBLS REMEDIATED IN COMPLIANCE WITH RRC STATEWIDE RULE 91.