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ENABLE MIDSTREAM PARTNERS, LP

gas_transmission Incident —

Incident Information

Report Date—
OperatorENABLE MIDSTREAM PARTNERS, LP
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates35.16029, -94.32509

Cause

CauseCORROSION FAILURE
Subcause—

Casualties

Fatalities0
Injuries0

Costs

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

Location Map

Incident Narrative

A POSSIBLE LEAK/FIRE WAS DISCOVERED ON 5/11/2023 AT 14:03 BY OPERATIONS TECHNICIANS CONDUCTING ANNUAL LINE PATROLS ON LINE O-470. TECHNICIANS WERE CHANGING OUT SIGN MARKERS IN THE O-470 ROW WHEN THEY FELT HEAT COMING FROM UNDERNEATH THE ROCKS THAT COVERED PIPELINE IN THE ROW. TECHNICIANS IMMEDIATELY BACKED AWAY FROM THE LOCATION. TECHNICIANS WENT TO BOTH THE UPSTREAM AND DOWNSTREAM VALVE LOCATIONS TO BEGIN ISOLATING THE PIPELINE. OPERATIONS TECHNICIANS NOTIFIED THE OPS MANAGER AT 15:45, WHO THEN NOTIFIED THE OPS DIRECTOR OF THE SITUATION. A CONFERENCE CALL WAS CONDUCTED (BEGINNING AT 16:00) TO DEVELOP A PLAN TO ISOLATE AND REMEDIATE THE SECTION OF PIPE WITH THE LEAK. THE NRC (#1367017) WAS NOTIFIED AT 16:21 ON 5/11/2023. A 48HR NRC NOTIFICATION WAS PLACED AT 12:48 ON 5/14/2023. A FINAL NRC NOTIFICATION WAS PLACED AT 11:29 ON 5/15/2023; THIS UPDATE WAS TO CLARIFY THAT THE PIPELINE INVOLVED IN THIS LEAK INCIDENT WAS A TRANSMISSION PIPELINE. A PLAN WAS PUT IN PLACE TO LOWER PRESSURE FROM 728PSIG (THE PRESSURE AT TIME OF DISCOVERY) TO 200PSIG, IN AN EFFORT TO KEEP ANY POTENTIAL FLAME BURNING UNTIL THE EXACT LOCATION OF THE LEAK COULD BE DETERMINED. OPS TECHNICIANS BEGAN BLOWING DOWN THE PIPELINE AT 17:34 AND GOT THE LINE PRESSURE DOWN TO 600PSIG BY 18:11 WHILE CONTRACTORS MOBILIZED TO THE SITE. CONTRACTORS UTILIZED A TRACKHOE WITH AN EXTENDED BOOM TO PULL ROCKS AWAY FROM THE LEAK LOCATION...AS ROCKS WERE PULLED AWAY, THE FLAME/FIRE WAS VISIBLE; AS CONTRACTORS WERE WORKING THE PIPELINE WAS BROUGHT DOWN TO 200PSIG. THE FIRE WAS EXTINGUISHED JUST BEFORE 24:00 ON 5/11/2023. AIR MOVERS WERE THEN UTILIZED TO COMPLETE THE BLOW DOWN. THE CAUSE OF THE LEAK WAS IDENTIFIED AS EXTERNAL CORROSION (PITTING) AND THE FIRE/FLAME WAS LIKELY IGNITED BY A LIGHTNING STRIKE ON 5/11/2023. A 41' SEGMENT OF PIPE WAS SPOOLED IN TO REMEDIATE THE LEAK LOCATION. THE PIPELINE WAS BROUGHT BACK IN TO SERVICE ON 5/15/2023 AT 16:30. NO BUILDINGS INTENDED FOR HUMAN OCCUPANCY WERE WITHIN 220 YARDS OF THE SEGMENT AND NO DOMESTIC CUSTOMERS WERE IMPACTED BY THE OUTAGE.

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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