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ENBRIDGE OFFSHORE (GAS GATHERING) L.L.C.

gas_transmission Incident —

Incident Information

Report Date—
OperatorENBRIDGE OFFSHORE (GAS GATHERING) L.L.C.
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates27.87578, -91.98639

Cause

CauseINCORRECT OPERATION
Subcause—

Casualties

Fatalities0
Injuries0

Costs

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

Location Map

Incident Narrative

ORIGINAL REPORT: PLATFORM PERSONNEL AT GARDEN BANKS BLOCK 128A PLATFORM BEGAN PIG LOADING OPERATIONS FOR ENBRIDGE 30-INCH PIPELINE SEGMENT NUMBER 10894 AT 12:00 AM, NOVEMBER 8, 2017. WHILE PRESSURING THE PIG BARREL, A RELEASE OF NATURAL GAS OCCURRED, WHICH RESULTED IN A FIRE AT 1:30 AM THE SAME DAY. TWO PLATFORM PERSONNEL RECEIVED MINOR INJURIES FOR WHICH THEY WERE TREATED AT A MEDICAL FACILITY AND RELEASED. ALL PLATFORM PERSONNEL WERE REMOVED FROM THE PLATFORM ON NOVEMBER 8, 2017. THE FIRE WAS SUBSEQUENTLY EXTINGUISHED ON NOVEMBER 9, 2017 BY LOWERING PRESSURE ON THE PIPELINE AND PERSONNEL RETURNED TO THE PLATFORM. THE ENBRIDGE 30-INCH PIPELINE HAS NOT RETURNED TO SERVICE. THE CAUSE OF THE INCIDENT IS UNDER INVESTIGATION. SUPPLEMENTAL REPORT: ENBRIDGE DID NOT OPERATE THE PLATFORM OR THE PIGGING OPERATIONS. THOSE ACTIVITIES WERE CONDUCTED BY THE THIRD PARTY CONTRACTOR PLATFORM OPERATOR USING THEIR PROCEDURES. THE PLATFORM PERSONNEL WHO WERE INJURED WERE EMPLOYED BY THE THIRD PARTY CONTRACTOR PLATFORM OPERATOR. GIVEN THIS EMPLOYMENT RELATIONSHIP, ENBRIDGE IS NOT AWARE OF WHETHER THE PLATFORM PERSONNEL RECEIVED DOT DRUG AND ALCOHOL TESTING. ADDITIONALLY, ENBRIDGE HAS LEARNED THAT ONE OF THE TWO INJURED PLATFORM PERSONNEL SUSTAINED INJURIES MORE SIGNIFICANT THAT ORIGINALLY REPORTED. FINALLY, SIX MEMBERS OF A PAINTING CREW HOUSED IN THE CREW QUARTERS AT THE TIME OF THE INCIDENT CLAIM EMOTIONAL AND/OR PHYSICAL INJURIES, BUT THOSE CLAIMS HAVE NOT BEEN VERIFIED. THE PRESSURE IN THE PIPELINE WAS A 1,086 PSIG AT THE TIME OF THE INCIDENT. IT IS ESTIMATED THAT THE PRESSURE WITHIN THE BARREL (AT THE POINT OF THE FAILURE) WAS 400 PSIG. THE RESULT OF THE METALLURGICAL INVESTIGATION INDICATED THAT THE CAUSE OF THE INCIDENT WAS INCOMPLETE CLOSURE OF THE CLAMP RINGS ONTO THE DOOR AND BARREL FLANGES WHICH OCCURRED WHILE THE THIRD PARTY CONTRACTOR PLATFORM OPERATOR WAS PERFORMING ROUTINE PIPELINE MAINTENANCE PIGGING OPERATIONS ON THE ENBRIDGE 30-INCH PIPELINE. THE ENBRIDGE 30-INCH PIPELINE WAS RETURNED TO SERVICE FOLLOWING THE INCIDENT ON JULY 11, 2018.

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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