TEXAS GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2017-12-24

Gas transmission and gathering incident in DOWNSVILLE, LINCOLN County, LA. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 129 NATURAL GAS released, $136,689 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20180017.

Operator ID: 19270.

Reported incident date: 12/24/2017 14:30.

Location detail: 25+0125

Cause detail: EXTERNAL CORROSION

Cause detail: A LANDOWNER CONTACTED TEXAS GAS CONTROL ROOM TO REPORT A SUSPECTED LEAK. OPERATIONS PERSONNEL VERIFIED THE LEAK AND ISOLATED THE SECTION OF PIPE CONTAINING THE LEAK UNTIL COMPLETE INVESTIGATION COULD BE PERFORMED. INVESTIGATION CONFIRMED LEAK AND THE PIPE JOINT CONTAINING THE LEAK WAS REPLACED. THE ROOT CAUSE OF THE EVENT IS CORROSION INTERACTING WITH A WELD DEFECT IN THE CIRCUMFERENTIAL WELD. THIS IS WHY THE ILI TOOL DID NOT DETECT THIS DEFECT IN 2017. WITHOUT THE CORROSION, THE CIRCUMFERENTIAL WELD DEFECT WOULD HAVE REMAINED STABLE, THEREFORE, THE ROOT CAUSE FOR THIS DEFECT IS CORROSION. 3-5-18 UPDATE PER PHMSA REQUEST. *LANDOWNER NOTIFICATION OCCURRED ON 12-24-2017 AT 14:30 *CONFIRMED DISCOVERY OCCURRED ON 12-24-2017 AT 14:50 *NRC CALL WAS MADE ON 12-24-2017 AT 15:24 *WILL UPDATE COSTS WHEN THEY BECOME AVAILABLE. 4-25-18 UPDATE WITH FINAL COSTS AND SUBMIT FINAL REPORT.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — EXTERNAL.

PHMSA indexed costs: $165,885 reported total cost, $90,462.656 in 1984 dollars, $198,921.136 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.