ENABLE GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2018-05-24

Gas transmission and gathering incident in BRISCOE, HEMPHILL County, TX. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 13500 NATURAL GAS released, $500 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: 20180062.

Operator ID: 602.

Reported incident date: 5/24/2018 4:15.

Location detail: AD-23

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON MAY 24, 2018 AT 04:15 AN ENABLE O&M TECH WAS NOTIFIED BY PERSONNEL AT THE WOODALL PLANT THAT A RELIEF VALVE WAS GOING OFF ON LINE AD-23 IN HEMPHILL COUNTY, TEXAS. THE O&M TECHNICIAN ARRIVED AT THE METER STATION LOCATION AT 04:49 AND BACKED OFF THE RELIEF VALVE, LOCKED IT OUT, AND RESET IT. THE EVENT WAS COMPLETE AT 06:15. APPROXIMATELY 13.5 MMCF OF NATURAL GAS WAS RELEASED. NO INJURIES, NO DAMAGE TO COMPANY PROPERTY. NRC WAS NOTIFIED ON 5/24 (#1213124) AND A 48 HR. FOLLOW UP ON 5/25 (#1213192). UPON INVESTIGATION THE O&M TECHNICIAN DETERMINED THE SETPOINT (971 [PSIG) OF THE RELIEF VALVE HAD SHIFTED CAUSING THE RELEASE. THE RELIEF WAS RESET TO THE PROPER SETPOINT (999 PSIG) AND THE RELIEF WAS PLACED BACK INTO SERVICE. PRIOR TO THE INCIDENT, THE RELIEF VALVE WAS LAST INSPECTED IN JULY 2017.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — MALFUNCTION OF CONTROL/RELIEF EQUIPMENT.

PHMSA indexed costs: $40,107 reported total cost, $36,996.046 in 1984 dollars, $46,015.397 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.