SOUTHERN STAR CENTRAL GAS PIPELINE, INC — Gas transmission and gathering — incident on 2014-07-11

Gas transmission and gathering incident in MULHALL, LOGAN County, OK. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 4875 NATURAL GAS released, $0 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: 20140081.

Operator ID: 31711.

Reported incident date: 7/11/2014 18:55.

Location detail: 100/203

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: SSCGP GAS CONTROL RECEIVED A CALL FROM A THIRD PARTY DRIVING ALONG THE SSCGP RIGHT-OF-WAY SOUTH OF MULHALL AT 20:42 ON JULY 11, 2014. THE THIRD PARTY STATED HE SMELLED SOMETHING UNUSUAL AND COULD HEAR A LOUD NOISE AT A SMALL BUILDING, NO SPECIFIC LOCATION WAS DETERMINED AT THIS TIME. GAS CONTROL NOTIFIED THE ON-CALL OPERATOR WHO STATED HE HAD AN ETA OF ONE HOUR. AS A PRECAUTIONARY MEASURE GAS CONTROL NOTIFIED LOGAN COUNTY PSAP. AT 20:52 GAS CONTROL RECEIVED A CALL FROM PVR LOGAN THAT THERE WAS A RELIEF VALVE BLOWING AT SSCGP SETTING #16999. GAS CONTROL NOTIFIED THE MEASUREMENT TECH WHO HAD AN ETA OF 40 MINUTES. THE OPERATOR ARRIVED ON SCENE AND SHUT IN THE RELIEF VALVE AT 21:09 AND WAITED FOR THE MEASUREMENT TECH TO ARRIVE. THE LINE PRESSURE WAS MANUALLY MONITORED WHILE THE RELIEF VALVE WAS OUT OF SERVICE. THE RELIEF VALVE WAS REPAIRED AND RETURNED TO SERVICE AT 23:04 ON JULY 11, 2014.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $19,331 reported total cost, $13,372.583 in 1984 dollars, $16,419.501 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.