ENBRIDGE ENERGY, LIMITED PARTNERSHIP

Incident Narrative

ON JANUARY 30, 2022, AT 11:39 AM CST THE EDMONTON CONTROL CENTER RECEIVED A PUMP BUILDING LEAK DETECTION ALARM AT SHELDON STATION. THE CONTROL CENTER NOTIFIED OPERATIONS PERSONNEL OF THE ALARM AND FIELD TECHNICIANS WERE DISPATCHED TO THE STATION. THE STATION ISOLATION COMMAND WAS SENT, AND SHELDON STATION WAS FULLY SHUT DOWN AND ISOLATED AT 11:53 AM CST. AT 2:06 PM CST FIELD TECHNICIANS ARRIVED AT SHELDON STATION DISCOVERED APPROPRIATELY 25 GALLONS OF CRUDE OIL HAD BEEN RELEASED IN THE LINE 14 PUMP BUILDING. THE SOURCE WAS IDENTIFIED AS THE SEAL FLUSH RECIRCULATION LINE ON UNIT 1. ALL OIL WAS CLEANED UP AND PROPERLY DISPOSED OF. UNIT 1 REMAINED LOCKED OUT FOR REPAIRS AND THE REST OF THE STATION WAS RETURNED TO SERVICE. AN INVESTIGATION DETERMINED THAT THE FAILURE WAS DUE TO EROSION OF THE INBOARD ORIFICE FROM THE INSIDE TO OUT WHICH RESULTED IN A PINHOLE ON THE THREADS OF THE MALE END OF THE INBOARD ORIFICE FITTING. NO OTHER EROSION WAS NOTED ON ANY OF THE OTHER FITTINGS/TUBING. A NEW INBOARD FLUSH ORIFICE FITTING WAS INSTALLED, AND UNIT 1 WAS RETURNED TO SERVICE. UNIT 2 AT SHELDON STATION IS THE SAME MANUFACTURE AS UNIT 1 THEREFORE IT WAS ALSO INSPECTED AND EROSION WAS OBSERVED AT BOTH THE INBOARD AND OUTBOARD POSITION. NEW FLUSH ORIFICES WERE INSTALLED ON UNIT 2. ADDITIONAL INSPECTIONS AND REPLACEMENTS OF ORIFICE FITTINGS ON SIMILAR MANUFACTURED PUMPS ON LINE 14 IS EXPECTED TO BE COMPLETED BY JULY 2022.