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TRANSCONTINENTAL GAS PIPE LINE COMPANY

gas_transmission Incident —

Incident Information

Report Date—
OperatorTRANSCONTINENTAL GAS PIPE LINE COMPANY
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates30.65694, -92.02667

Cause

CauseEQUIPMENT FAILURE
Subcause—

Casualties

Fatalities0
Injuries0

Costs

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

Location Map

Incident Narrative

ON OCTOBER 18, 2018, AT STATION 54, THE SUSPECTED LEAK WAS DISCOVERED BY AN EMPLOYEE WALKING THROUGH THE STATION YARD AND SAW BUBBLES AROUND THE VALVE. UPON FURTHER INVESTIGATION, AT 5:35 PM THE LEAK WAS CONFIRMED TO BE GAS. THE STATION WAS ISOLATED AND BLOWN DOWN. HAND DIGGING WAS INITIATED AT 6:30PM. HYDROVAC TRUCK SHOWED UP AROUND 7P AND EXPOSED THE VALVES. ON 10/19/18, THE YARD WAS PURGED AND PACKED TO 300PSI AND THE LEAK POINTS WERE VERIFIED AT 6:00AM. VALVE WAS MONITORED AND RETURNED TO SERVICE AT 6PM. THE VALVE CONTINUED TO BE MONITORED AND THE MANUFACTURER WAS CONTACTED FOR REPAIR RECOMMENDATIONS. THE LEAK WAS ON A GROVE BALL VALVE WITH A FLANGED BODY. THE RECOMMENDED REPAIR METHOD WAS TO TORQUE THE FLANGED BODY. ON 10/30/18, THE VALVE BODY BOLTS WERE RE-TORQUED TO MANUFACTURERS TORQUE SPECIFICATIONS AND THE LEAK WAS STOPPED. RETURNED TO SERVICE AT 3PM. CONTINUED FROM G6 ITEM 6: BODY FLANGE NEEDED TO BE TORQUED. THE VALVE'S FLANGED BODY IS OVER 40 YEARS OLD AND IS BELIEVED TO HAVE LOST SOME TORQUE OVER THE YEARS DUE TO AGE ALONG WITH EXPANSION AND CONTRACTION WITH TEMPERATURE AND TIME. UPDATE 1/17/2019 - LEAK WAS REPORTED TO THE NRC ON 10/20/2018 WHEN THE COST OF THE REPAIR WAS DISCOVERED TO BE EXPECTED TO EXCEED $50K.

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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