ENBRIDGE OFFSHORE (GAS GATHERING) L.L.C.
gas_transmission Incident — — September 11, 2020
Incident Information
| Incident Date | September 11, 2020 |
| Operator | ENBRIDGE OFFSHORE (GAS GATHERING) L.L.C. |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 28.57353, -91.95944 |
Cause
| Cause | CORROSION FAILURE |
| Subcause | EXTERNAL CORROSION |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $111,000 |
| Emergency Response | $0 |
| Other Costs | $0 |
Location Map
Incident Narrative
AT APPROXIMATELY 1:00 PM. CDT ON SEPTEMBER 11, 2020, ENBRIDGE OFFSHORE GAS GATHERING L.L.C.'S (ENBRIDGE OFFSHORE) DISCOVERED A LEAK ON A 2-INCH DIAMETER BY-PASS LINE ON A PLATFORM (SMI 76) LOCATED ON SM 76P IN THE GULF OF MEXICO. ENBRIDGE OFFSHORE SUBSEQUENTLY DEPRESSURIZED THE LINE AFTER ATTEMPTING TO ISOLATE THE PIPELINE AND STOP THE LEAK. ENBRIDGE OFFSHORE NOTIFIED THE NRC AT 3:55 CDT AFTER MAKING ATTEMPTS TO ISOLATE THE LINE AND STOP THE LEAK. THE PIPELINE REMAINS OUT OF SERVICE AT THIS TIME DUE TO HURRICANE LAURA AND HURRICANE DELTA. THE PRELIMINARY DIRECT CAUSE OF THE LEAK IS ATMOSPHERIC CORROSION. UPDATED 4-8-2021 GARDEN BANKS, SMI-76 EXPERIENCED A PINHOLE LEAK ON A 2-INCH BYPASS LINE LOCATED UPSTREAM OF THE 30-INCH AT A PLATFORM SHUTDOWN VALVE. THE 2-INCH PIPE WAS COVERED WITH A COMPOSITE REINFORCEMENT WRAP. AFTER REMOVING THE COMPOSITE REINFORCEMENT WRAP IT WAS DETERMINED THAT THE LEAK WAS THE RESULT OF AN EXTERNAL CORROSION PIN HOLE BENEATH THE COMPOSITE REINFORCEMENT WRAP. THE LINE HAS BEEN REPLACED AND RECOATED.
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.