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COLUMBIA GAS TRANSMISSION, LLC

gas_transmission Incident —

Incident Information

Report Date—
OperatorCOLUMBIA GAS TRANSMISSION, LLC
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates40.82003, -82.42183

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 JANUARY 23RD, 2022, PAVONIA COMPRESSOR STATION (CS) WAS SUBJECT TO AN UNINTENTIONAL RELEASE OF NATURAL GAS (MATERIAL) RESULTING IN MATERIAL LOSS EXCEEDING 3,000 MCF. PAVONIA IS A TRANSMISSION CS IS LOCATED IN RICHLAND COUNTY, OHIO THAT IS OPERATED AND MAINTAINED BY COLUMBIA GAS TRANSMISSION, LLC (COMPANY), A TC ENERGY ENTITY. AT 19:51 EST, A COMPANY PERSONNEL RECEIVED A NOTIFICATION FROM THE PUBLIC OF A POTENTIAL RELEASE OF MATERIAL AT PAVONIA CS. COMPANY OPERATIONS PERSONNEL ARRIVED ON-SITE AT 20:04 EST WHERE THE UNINTENDED RELEASE OF MATERIAL WAS IDENTIFIED AND ISOLATED AT 20:51 EST. THE PRELIMINARY MATERIAL LOSS CALCULATIONS WERE DETERMINED TO BE GREATER THAN 3,000 MCF, HENCE, THE EVENT WAS REPORTED TO THE NATIONAL RESPONSE CENTER (NRC). THE PRELIMINARY ASSESSMENT DETERMINED A SMALL CONTROL AIR LEAKAGE ON THE BLOW-OFF VALVE AND FROST IN THE LINE CAUSED THE UNINTENTIONAL OPERATION OF THE BLOW-OFF VALVE. AN INVESTIGATION WAS COMPLETED, AND IT WAS CONFIRMED THAT MOISTURE IN THE TRIGGER AIRLINE FREEZING-OFF IS THE MOST LIKELY CASUAL FACTOR FOR THE UNINTENTIONAL OPENING OF THE BLOW-OFF VALVE. THE TRIGGER AIR SYSTEM FOR BLOW-OFF VALVE IS A STAGNATE SYSTEM UNLESS A LEAK ALLOWS FLOW IN THE TRIGGER AIRLINES. A LEAK IN THE SYSTEM IS THE MOST PROBABLE CAUSE AS THE LEAK WOULD INDUCE FLOW IN THE TRIGGER SYSTEM AND ALLOW PRESSURE TO DISSIPATE ONCE A BLOCKAGE EXIST. VALVE. THE INITIAL NRC REPORT NO.1327142 AND THE NRC 48-HOUR REPORT NO.1327254 HAVE BEEN CALLED-IN ON JANUARY 23RD AND JANUARY 25TH RESPECTIVELY. TWO RECOMMENDATIONS WERE ISSUED IN ORDER TO AVOID FUTURE RE-OCCURRENCE FROM TAKING PLACE AT THIS CS. THEY WERE: I) CHECK ALL ABOVE GRADE ESD TRIGGER AIR PIPING AND CONNECTIONS FOR LEAKS, II) ADD A PROJECT TO INSTALL A MOISTURE ANALYZER ON THE AIR DRYER. THE FINAL REPORT WILL BE SUBMITTED AFTER COMPLETION OF THE PROJECT. THE DEW POINT MONITOR HAS BEEN INSTALLED AND A STATION ALARM HAS BEEN ADDED TO ALERT OPERATION IF THE DEW POINT GOES TOO HIGH. THIS PROJECT WAS COMPLETED ON SEPTEMBER 18, 2023.

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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