EQT MIDSTREAM — Gas transmission and gathering — incident on 2015-12-23

Gas transmission and gathering incident in WAYNESBURG, GREENE County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 6075.43 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: 20160003.

Operator ID: 31604.

Reported incident date: 12/23/2015 10:15.

Location detail: ESD VLV 8109

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: AT APPROXIMATELY 10:15 AM ON DECEMBER 23RD, 2015 PRATT GASKET LEAK AT PRATT COMPRESSOR STATION TRIGGERED THE GAS DETECTORS CAUSING AN ESD. THE COMPRESSOR TECHNICIAN ON SITE DETERMINED ALL OF THE ESD VALVES CYCLED CORRECTLY EXCEPT ONE MAINLINE VALVE WHICH ALLOWED CONTINUED GAS VENTING TO ATMOSPHERE. THE VALVE THAT WAS PARTIALLY OPEN WAS MANUALLY CLOSED BY THE COMPRESSOR TECHNICIAN BY 10:40 AM. THE VALVE WAS GREASED AND CYCLED MULTIPLE TIMES TO ENSURE NORMAL OPERATION BEFORE BEING PUT BACK IN SERVICE.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $14,067 reported total cost, $13,043.345 in 1984 dollars, $16,015.246 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.