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ENBRIDGE ENERGY, LIMITED PARTNERSHIP

hazardous_liquid Incident —

Incident Information

Report Date—
OperatorENBRIDGE ENERGY, LIMITED PARTNERSHIP
Commodity—
Pipeline Typehazardous_liquid

Location

State
Coordinates46.55428, -90.82354

Cause

CauseMATERIAL FAILURE OF PIPE OR WELD
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

ON AUGUST 10, 2022 AT APPROXIMATELY 13:40 CDT, A CONTRACTOR NOTICED A 1"" DIAMETER CIRCLE OF OIL STAINING ON THE WELD OF A WELD+ COUPLING ON LINE 5 AT MP 1159. THIS PIPING HAD BEEN EXCAVATED FOR A PROJECT TO INSTALL THREE 2"" TOR FITTINGS FOR FUTURE USE. THE WELD IN QUESTION HAD BEEN SANDBLASTED BY A CONTRACTOR TWO DAYS PRIOR ON AUGUST 8, 2022 AND NDE TESTING WAS COMPLETED WITH PASSING RESULTS WITH NO STAINING OBSERVED IN THAT AREA AT THAT TIME. CONTRACTOR NOTIFIED ENBRIDGE PERSONNEL WHO THEN NOTIFIED THE MANAGER ON CALL. THE EDMONTON CONTROL CENTER WAS CONTACTED AND LINE 5 WAS SHUT DOWN AT 14:01 CDT. CONTAINMENT WAS PLACED UNDER THE PIPE AND STAINING WAS MONITORED UNTIL ENBRIDGE PIPELINE MAINTENANCE CREW ARRIVED ON SITE AT 14:45 CDT. STAINING REMAINED UNCHANGED AND WAS WIPED OFF THE WELD AT 15:45 CDT AND DID NOT REAPPEAR. AT NO TIME WAS ANY SOIL IMPACTED BY THE STAINING WHICH WAS ESTIMATED TO HAVE BEEN CAUSED BY APPROXIMATELY ONE DROP OF PRODUCT. AFTER LOCAL SUPERVISION DISCUSSED POTENTIAL REPAIR OPTIONS, IT WAS DETERMINED AT 16:15 CDT THAT THE $50,000 NRC REPORTING THRESHOLD WOULD BE SURPASSED. THE NRC WAS NOTIFIED AT 17:00 CDT (REPORT #1344103). THE NRC 48-HOUR UPDATE NOTIFICATION WAS MADE ON AUGUST 12, 2022 AT 14:18 CDT (REPORT #1344330). A WELDED SLEEVE WAS INSTALLED AND LINE 5 WAS RESTARTED ON AUGUST 12, 2022 AT 10:48 CDT. AFTER FURTHER INVESTIGATION IT IS BELIEVED THAT THE FILLET WELD ON THE WELD+ COUPLING WAS NOT FULLY COVERING THE SOCKET BOLT, AND THERE WAS INDICATION OF PITTING IN THE AREA OF THE SOCKET BOLT CAP. SANDBLASTING OF THE AREA TO ACCOMMODATE NDE TESTING CAUSED PRODUCT TO WORK ITS WAY FROM THE PRESSURE CONTAINING FITTING WHICH LED TO THE RELEASE OF ONE DROP OF CRUDE OIL. DUE TO THE DEFECT BEING ENCAPSULATED NO FURTHER PHYSICAL EXAMINATION OR METALLURGICAL TESTING CAN BE COMPLETED TO VERIFY OUR FINDINGS. THE ACTUAL VOLUME RELEASED AT MP 1159 WAS ONE DROP OF CRUDE OIL. THE PHMSA PORTAL DOES NOT RECOGNIZE VOLUMES LESS THAN 0.1 BARRELS THEREFORE THAT IS THE VOLUME ENTERED.

About This Pipeline Incident

Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.

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