SOUTHERN STAR CENTRAL GAS PIPELINE, INC — Gas transmission and gathering — incident on 2014-11-27

Gas transmission and gathering incident in WAKITA, GRANT County, OK. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3910 NATURAL GAS released, $2,100 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: 20140145.

Operator ID: 31711.

Reported incident date: 11/27/2014 3:17.

Location detail: 150/10321+78

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON 11/27/2014 AT 03:20 SSC GAS CONTROL BEGAN RECEIVING ALARMS THAT LASTED APPROXIMATELY 15 MINUTES. DURING THIS TIME THE PRESSURES ON THE "GUYMON 26IN." WERE OBSERVED AS DECREASING AND CONTINUED FOR APPROXIMATELY 40 MINUTES. GAS CONTROL ATTEMPTED TO INVESTIGATE THE POTENTIAL CAUSE AND AFTER NO REASONING COULD BE DETERMINED, SSC OPERATIONS WERE CALLED AT 03:50. SSC OPERATIONS ARRIVED AT THE WAKITA COMPRESSOR STATION AND CONFIRMED WITH GAS CONTROL, AT 04:16, THE CAP ON THE RELIEF VALVE WAS OFF AND IT WAS THE EXPECTED CAUSE OF THE DROP IN PRESSURE. BY 11:29 ALL RELIEF VALVES BETWEEN WAKITA STATION AND THE UPSTREAM ALVA STATION HAD BEEN CONFIRMED AS NOT BLOWING. THE SET-POINTS WERE TESTED ON THE RELIEF AND FOUND TO WORK CORRECTLY. THE STATION PIPING WAS ISOLATED UNTIL 12/2 WHEN THE RELIEF WAS REBUILT AND TESTED AGAIN.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $19,431 reported total cost, $12,814.968 in 1984 dollars, $17,865.213 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.