TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2018-02-22

Gas transmission and gathering incident in Not Within a Municipality, TIOGA County, PA. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 11720 NATURAL GAS released, $5,700 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: 20180032.

Operator ID: 19160.

Reported incident date: 2/22/2018 16:57.

Location detail: 0

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: 02/22/2018; STORM WEATHER CAUSED A LOSS OF COMMERCIAL ELECTRICAL POWER AND COMMUNICATIONS AT TGP STATION 315 AT 16:25 EST OR LATER. WITH LOSS OF COMMERCIAL POWER, THE STATION ESD SYSTEM FUNCTIONED AS DESIGNED. 16:35 EST, GAS CONTROL NOTIFIED OPERATORS AT MANNED STATION 313 OF STATION 315 COMPRESSOR UNITS FALLING OFF-LINE. TECHNICIANS WERE IMMEDIATELY DISPATCHED AND ARRIVED AT STATION 315 AT 18:00 EST AND FOUND NATURAL GAS VENTING TO ATMOSPHERE FROM THE STATION BLOW DOWN. TECHNICIANS FOUND VALVE AS-2 HAD NOT CLOSED. TECHNICIANS CLOSED VALVE AS-2 AT 18:10 EST THEREBY TERMINATING THE UNINTENTIONAL NATURAL GAS VENTING. THE STATION UPS AND BPS SYSTEMS, WHICH HAD SHUT OFF AS UPS DEPLETED, WERE TESTED AND RESET. THE CONTROLS OF VALVE AS-2 WERE TESTED, FLUID LEVELS CHECKED AND THE VALVE WAS GREASED. STATION 315 WAS RETURNED TO SERVICE ON 02/22/2018 AT APPROXIMATELY 21:50 PM, EST. THERE WAS NO CUSTOMER IMPACT. INVESTIGATION AND MODIFICATIONS CONTINUED. 03/23/ 2018, DEBRIS WAS CLEANED FROM FILTERS OF VALVE CONTROLLERS IN THE YARD. UPS WAS RETIRED AND BPS PROVIDED ANOTHER ELECTRICAL SOURCE. 05/18/2018, STATION ESD SYSTEM TESTED PROPERLY. TESTING OF THE EMERGENCY GENERATOR WAS COMPLETED ON 06/27/2018; AN ISSUE WAS FOUND WITH THE AIR / FUEL CONTROLLER THUS UNIT WAS NOT PROVIDING FULL STATION LOAD, NOT SUPPORTING UPS AND BPS. REPAIR OF AIR / FUEL CONTROLLER HAS BEEN COMPLETED.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $48,323 reported total cost, $38,104.673 in 1984 dollars, $55,864.874 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.