SOUTHERN NATURAL GAS CO — Gas transmission and gathering — incident on 2017-12-19

Gas transmission and gathering incident in Not Within a Municipality, TUSCALOOSA County, AL. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 15150 NATURAL GAS released, $1,000 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: 20180013.

Operator ID: 18516.

Reported incident date: 12/19/2017 17:20.

Location detail: MP 286.138

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ALL TIMES ARE CST; PIR OF PIPELINE IS 454 FEET; PIR WITH KM BUFFER IS 494 FEET; NRC 48-HOUR UPDATE REPORT NUMBER 1200280; DIAPHRAGM OF ACTUATOR ON CONTROL VALVE OF FUEL GAS SYSTEM SPLIT RESULTING IN LOSS OF VALVE CONTROL; SAID VALVE OPENED RELEASING NATURAL GAS THROUGH SYSTEM PIPING TO ATMOSPHERE; EMPLOYEE ARRIVED ON SITE AND ISOLATED SYSTEM TERMINATING NATURAL GAS RELEASE; INVESTIGATION AND REPAIR COMMENCED; UNIT WAS AVAILABLE FOR NORMAL SERVICE 12/19/2017 AT 20:30 HOURS;

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $44,428 reported total cost, $41,609.362 in 1984 dollars, $51,844.492 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.