ENTERPRISE PRODUCTS OPERATING LLC

Incident Narrative

AT 18:27 ON 5/26/2022 ENTERPRISE HOUSTON CONTROL CENTER (HCC) RECEIVED A HAZARDOUS GAS DETECTION ALARM AT COUPLAND PUMP STATION ON THE SEMINOLE BLUE MAINLINE. AN ENTERPRISE TECHNICIAN ARRIVED ON SITE AT 19:25 AND CONFIRMED A RELEASE FROM THE SEMINOLE BLUE PUMP HEADER. AT THAT TIME HCC SHUT DOWN THE PUMP STATION AND THE UPSTREAM ISOLATION VALVE. THE SOURCE OF THE LEAK APPEARED TO BE THE #2 PUMP SUCTION VALVE, AND AT 20:20 THE DETERMINATION WAS MADE THAT THE LEAK WAS REPORTABLE TO THE NRC ON THE BASIS OF ANTICIPATED VALVE REPAIR/REPLACEMENT COSTS EXCEEDING $50,000. THE MANUAL ISOLATION VALVE DOWNSTREAM OF COUPLAND STATION COULD NOT BE CLOSED UNTIL THE PRESSURE WAS SUFFICIENTLY PULLED DOWN BY DOWNSTREAM PUMPS, WHICH RESULTED IN THE VALVE BEING CLOSED AT APPROXIMATELY 21:00. AT 22:10 ENTERPRISE PERSONNEL DETERMINED THAT THE SOURCE OF THE LEAK WAS A FAILED 1/2 INCH PRESSURE SAFETY VALVE (PSV) ON THE SUCTION VALVE BODY, INSTEAD OF THE SUCTION VALVE ITSELF. THE PSV WAS REPLACED AT A COST SIGNIFICANTLY LOWER THAN $50,000. THE LINE WAS RESTORED TO SERVICE ON 5/27/2022 AT 01:11. ORIGINAL NRC REPORT #1337120, 48-HOUR UPDATE #1337217. THE LOWER REPAIR COST WAS REPORTED TO NRC DURING THE 48-HOUR UPDATE. IN ADDITION, PHMSA AID WAS NOTIFIED OF THE LOWER REPAIR COST.