NATIONAL FUEL GAS SUPPLY CORP — Gas transmission and gathering — incident on 2018-01-01

Gas transmission and gathering incident in Not Within a Municipality, POTTER County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 0 released, $111 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: 20180020.

Operator ID: 13063.

Reported incident date: 1/1/2018 3:08.

Location detail: ALP1

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON JANUARY 1, 2018 AT 3:08 AM EST ELLISBURG COMPRESSOR STATION EXPERIENCED AN EMERGENCY SHUT DOWN DUE TO A FAULTY ELECTRICAL RELAY IN THE STATION CONTROL PANEL. NO PIPELINES OR STRUCTURES WERE DAMAGED. ELLISBURG COMPRESSOR STATION IS LOCATED IN POTTER COUNTY AT 188 ROSE LAKE ROAD, GENESEE, PA 16923. THE EMERGENCY SHUT DOWN OF THE STATION AFFECTED NATURAL GAS TRANSMISSION THROUGH-PUT. PRIMARY FIRM TRANSPORTATION SERVICE AND LEASE TRANSPORTATION SERVICE WAS REDUCED BY 79% TO 21% THROUGH THE LINE X SEGMENT DOWNSTREAM OF THE ELLISBURG COMPRESSOR STATION. AS A RESULT OF THE REDUCTION IN NATURAL GAS THROUGH-PUT, NATIONAL FUEL IS REPORTING THIS EVENT AS AN INCIDENT. STATION PERSONNEL WERE IMMEDIATELY MOBILIZED AND THE FAULTY RELAY WAS IDENTIFIED AND REPLACED. THE COMPRESSOR STATION AND TRANSMISSION CAPACITY WERE RESTORED TO FULL SERVICE AT 8:10 PM EST ON JANUARY 1, 2018.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $19,113 reported total cost, $10,133.529 in 1984 dollars, $22,418.933 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.