SOUTHERN STAR CENTRAL GAS PIPELINE, INC — Gas transmission and gathering — incident on 2014-12-24

Gas transmission and gathering incident in WAKITA, GRANT County, OK. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 1890 NATURAL GAS released, $58,700 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: 20150009.

Operator ID: 31711.

Reported incident date: 12/24/2014 21:12.

Location detail: 150/10321+78

Cause detail: INTERNAL CORROSION

Cause detail: AT 21:12 ON DECEMBER 24, 2014, SSC OPERATOR CALLED GAS CONTROL AND REPORTED A POSSIBLE RELIEF VALVE BLOWING AT OR NEAR THE WAKITA STATION. SSC GAS CONTROL RECEIVED TWO LOW RATE OF CHANGE ALARMS AT WAKITA STATION AT THE SAME TIME. PSAP WAS NOTIFIED AND PRESSURE CONTINUED TO FALL IN THE AREA. AT 21:38 SSC GAS CONTROL WAS NOTIFIED THAT LOCAL OPERATIONS DISCOVERED A LINE UNDER THE SEPARATOR TANK LEAKING. OPERATIONS HAD CLOSED THE SUCTION AND DISCHARGE VALVES TO THE STATION AND ISOLATED BOTH UNITS. NO HORSEPOWER WAS RUNNING AT THE TIME. THIS WAS NOT A RELIEF VALVE BLOWING. BECAUSE THE STATION WAS NOT NEEDED AND THE AFFECTED PIPELINE WAS ISOLATED THE ISSUE WAS CONTAINED AND THERE WAS NOT ANY IMMEDIATE THREAT. IT WAS DETERMINED THAT THE LEAK WOULD BE INVESTIGATED AT A LATER DATE TO DETERMINE THE CAUSE. WHEN SSC OPERATIONS BEGAN INVESTIGATING IT WAS DETERMINE THAT THE REPAIR OF THE LEAK COULD BE EXTENSIVE AND THE NRC WAS NOTIFIED.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $64,178 reported total cost, $33,519.648 in 1984 dollars, $78,125.39 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.