TEXAS GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2017-12-11

Gas transmission and gathering incident in LACASSINE, JEFFERSON DAVIS County, LA. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 21608 NATURAL GAS released, $43,000 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: 20180001.

Operator ID: 19270.

Reported incident date: 12/11/2017 14:38.

Location detail: 3+2650

Cause detail: DESIGN-, CONSTRUCTION-, INSTALLATION-, OR FABRICATION-RELATED

Cause detail: A POTENTIAL LEAK ON TEXAS GAS'S WLJ 14" LINE WAS REPORTED BY A LOCAL FARMER. OPERATIONS PERSONNEL CONFIRMED THE LEAK. THE LINE WAS ISOLATED AND REPAIRED AND RETURNED TO SERVICE. CAUSE REMAINS UNDER INVESTIGATION. 3-5-2018 *GAS CONTROL CENTER, THROUGH SCADA, IDENTIFIED A POTENTIAL SYSTEM UPSET AND CONTACTED FIELD OPERATIONS TO INVESTIGATE. CONCERN WAS POTENTIAL LOSS OF GAS. WHILE FIELD OPERATIONS WERE PERFORMING THEIR INVESTIGATION, A LAND OWNER NOTIFIED CONTROL CENTER THAT OUR PIPELINE WAS LEAKING. BASED ON THE FACT THAT OUR SCADA INDICATED A LOSS OF GAS AND WAS CONFIRMED BY A LAND OWNER, TEXAS GAS DECLARED DISCOVERY OF AN INCIDENT ON OUR SYSTEM WHICH WAS ON 12-11-17 AT 16:42. *FIELD PERSONNEL ARRIVED ONSITE ON 12-11-17 AT 17:03 AND RECONFIRMED PIPELINE LEAK WAS OURS. *NRC WAS CALLED ON 12-11-17 AT 17:15. *A DECISION WAS MADE TO BLOCK THE PIPELINE AND ALLOW THE GAS PRESSURE TO DISSIPATE THROUGH THE LEAK LOCATION. 5-9-18 REVISED TO UPDATE VARIOUS DETAILS INCLUDING A4 CALCULATION USING METHODOLOGY RECENTLY PROVIDED BY PHMSA. UPDATED COSTS. REPAIR WAS MADE BY REPLACING A PUP OF PIPE. IN REGARD TO PART G, THE METALLURGICAL REPORT INDICATED THAT THE FAILURE SURFACE WAS ASSOCIATED WITH FATIGUE. TEXAS GAS ENLISTED THE SERVICES OF STRESS ENGINEERING SERVICES, INC. TO EVALUATE EQUIPMENT LOADING, PRESSURE CYCLING, TEMPERATURE, AND OTHER SOURCES OF FATIGUE ON THE PIPELINE. WE ASSUME THAT THE POTENTIAL FOR FATIGUE OCCURRED DUE TO THE CONSTRUCTION METHODS USED AT THE TIME SINCE THIS LOCATION IS ASSOCIATED WITH A WRINKLE BEND. BASED ON OUR ANALYSIS, WE BELIEVE THIS IS A UNIQUE SITUATION AND IS NOT A SYSTEMIC ISSUE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED.

PHMSA indexed costs: $125,099 reported total cost, $98,029.257 in 1984 dollars, $147,557.778 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.