TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2018-10-19

Gas transmission and gathering incident in Not Within a Municipality, VICTORIA County, TX. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 201.4 NATURAL GAS released, $300,000 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: 20180116.

Operator ID: 19160.

Reported incident date: 10/19/2018 10:50.

Location detail: 470+14.5

Cause detail: EXTERNAL CORROSION

Cause detail: OCTOBER 18, 2018 17:39 - TENNESSEE GAS PIPELINE COMPANY (TGP) OPERATIONS PERSONNEL NOTIFIED BY THE LANDOWNER OF A POSSIBLE LEAK, PERSONNEL DEPLOYED TO THE LOCATION. 22:22 - SUSPECTED SITE FOUND BASED ON LANDOWNER DESCRIPTION. NO VISIBLE EVIDENCE OF A LEAK. AREA MONITORED OVERNIGHT. OCTOBER 19, 2018 10:00 - SMALL LEAK CONFIRMED ON LINE 100-2 USING GAS DETECTION EQUIPMENT. 10:27 - INITIATED INTERNAL EMERGENCY RESPONSE LINE (ERL) CALL NOTIFICATIONS PER COMPANY PROCEDURES TO DISCUSS THE INCIDENT. 10:45 - ERL CALL BEGAN. 10:50 - EVENT DETERMINED REPORTABLE TO NRC BASED ON REPAIR COSTS ESTIMATED OVER $50,000 DUE TO LOCATION AND WEATHER CONDITIONS. CALL TO NRC MADE FOLLOWED BY COURTESY CALL TO PHMSA ACCIDENT INVESTIGATION TEAM. 14:58 - COMPLETED LINE 100-2 BLOWN DOWN BETWEEN MLV 8-2 TO 9-2 16:40 - ONE-CALL TICKET (1879296796) ISSUED. OCTOBER 23, 2018 - ONE-CALL TICKET CLEARED. BECAUSE ACCESS TO LEAK SITE WAS VERY MUDDY AND THERE WAS STANDING WATER THROUGHOUT THE ROAD, IT WAS NECESSARY TO LAY MATS TO OBTAIN ACCESS. THIS TOOK APPROXIMATELY ONE WEEK TO LAY ALL OF THE MATS TO ACCESS THE SITE. DURING THIS TIME, THE LINE REMAINED BLOWN DOWN. OCTOBER 31, 2018 - MATTING COMPLETED AND PIPELINE EXPOSED IN PREPARATION FOR INSPECTION. NOVEMBER 1, 2018 - NDE PERFORMED AND IT APPEARS THAT THE LEAK WAS THE RESULT OF EXTERNAL METAL LOSS. DETERMINATION MADE TO REPLACE THE PIPE JOINT. NOVEMBER 2, 2018 - PIPE REPLACEMENT COMPLETED. NOVEMBER 3, 2018 - BELL HOLE BACKFILLED. LINE BACK IN SERVICE AT 7:05PM. POST-INCIDENT: BACTERIAL ANALYSIS PERFORMED. RESULTS WERE INCONCLUSIVE. MARCH 14, 2019 - METALLURGICAL TESTING REPORT COMPLETED AND CONCLUDED THAT THE CAUSE OF THE PINHOLE LEAK WAS ELECTROCHEMICAL EXTERNAL CORROSION AND THAT THE CHARACTERISTICS COMMONLY ASSOCIATED WITH MICROBIOLOGICALLY INDUCED CORROSION (MIC) WERE NOT PRESENT. ADDITIONAL NOTES: 48-HOUR NRC REPORT #1228045

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — EXTERNAL.

PHMSA indexed costs: $363,316 reported total cost, $188,748.088 in 1984 dollars, $426,411.603 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.