EQT MIDSTREAM — Gas transmission and gathering — incident on 2012-07-15

Gas transmission and gathering incident in FINLEYVILLE, WASHINGTON County, PA. Reported cause: OTHER INCIDENT CAUSE. Reported consequences: 0 fatalities, 0 injuries, 22609 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: 20120081.

Operator ID: 31604.

Reported incident date: 7/15/2012 9:00.

Location detail: H141 007+72

Cause detail: MISCELLANEOUS

Cause detail: AT 9:00 A.M. ON JULY 15, 2012 AN EQT OPERATIONS EMPLOYEE DISCOVERED A RELIEF VALVE VENTING AT THE HARTSON COMPRESSOR STATION. UPON INVESTIGATION THE EMPLOYEE DETERMINED THE RELIEF VALVE HAD BEEN VENTING APPROXIMATELY TWO HOURS. THE OPERATIONS EMPLOYEE NOTIFIED GAS CONTROL. GAS CONTROL OPERATED A CONTROL VALVE TO REROUTE GAS FLOW AND REDUCE THE PIPELINE PRESSURE. THE RELIEF VALVE CEASED VENTING AT APPROXIMATELY 9:20 A.M. THE MAOP OF THE PIPELINE ON WHICH THE RELIEF VALVE IS LOCATED IS 328 PSIG. THE RELIEF VALVE ACTIVATED AT 286 PSIG AND LEVELED OFF AT 260 PSIG. A CALCULATION WAS PERFORMED THAT DETERMINED THE GAS LOSS EXCEEDED THE 3 MILLION CUBIC FOOT THRESHOLD FOR REPORTING AS PER CFR49 PART 191.3. EQT HAS REVISED THE NORMAL OPERATION OF THIS PIPELINE SYSTEM AS A CORRECTIVE ACTION TO PREVENT A REOCCURENCE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: ALL OTHER CAUSES — MISCELLANEOUS.

PHMSA indexed costs: $63,305 reported total cost, $52,865.698 in 1984 dollars, $64,911.047 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.