ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

ON JULY 4, 2019 AT 9:50 PM CDT, THE ON CALL TECHNICIAN WAS DISPATCHED BY THE EDMONTON CONTROL CENTER TO THE FLOODWOOD LINE 4 STATION DUE TO A GAS ALARM. WHILE THE TECHNICIAN WAS EN ROUTE TO THE STATION, THE CONTROL CENTER RECEIVED ANOTHER GAS ALARM, INITIATING THE LINE 4 SHUT DOWN AT 10:03 PM CDT. UPON ARRIVING AT THE STATION AT 10:30 PM CDT, THE TECHNICIAN CONFIRMED OIL ON THE PUMP ROOM FLOOR AND THE INTERIOR WALLS OF THE BUILDING. ADDITIONAL PERSONNEL WERE DISPATCHED TO ASSIST WITH CLEAN UP. IT WAS DISCOVERED THAT THE SOURCE OF THE CRUDE OIL WAS A PINHOLE LEAK ON THE 1/2"" TUBING ON THE LINE 4 UNIT 2 PUMP. THE NRC WAS NOTIFIED ON JULY 5, 2019 AT 2:13 PM CDT (#1251072) AFTER THE UNIT 2 MOTOR WAS FOUND TO HAVE OIL INSIDE THE HOUSING UNIT AND THE COSTS WERE ESTIMATED TO EXCEED THE NRC REPORTING THRESHOLD TO CLEAN AND REPAIR THE MOTOR. A 48-HOUR UPDATE WAS MADE TO THE NRC ON JULY 7, 2019 AT 8:23 AM CDT (#1251215). THE PUMP IS CURRENTLY LOCKED OUT UNTIL THE MOTOR IS CLEANED AND THE PIPING REPLACED. APPROXIMATELY THREE CUBIC YARDS OF CONTAMINATED SOIL HAS BEEN PROPERLY DISPOSED OF. A THIRD-PARTY METALLURGICAL ANALYSIS DETERMINED THAT THE FAILURE WAS DUE TO MECHANICAL DAMAGE TO THE 1/2"" TUBING, AT AN UNKNOWN PREVIOUS TIME, CAUSING A PROTRUSION INTO THE TUBE. EVENTUALLY THE TUBING FAILED AT THE PROTRUSION. THE MOTOR WAS SENT IN FOR AN OVERALL CLEANING AND THE PUMP IS IN THE PROCESS OF BEING REBUILT. THE UNIT WILL BE PLACED BACK INTO SERVICE ONCE ALL PARTS HAVE BEEN PREPARED FOR ASSEMBLY.