TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2015-05-15

Gas transmission and gathering incident in Not Within a Municipality, POWELL COUNTY County, KY. Reported cause: OTHER INCIDENT CAUSE. Reported consequences: 0 fatalities, 0 injuries, 5321 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: 20150079.

Operator ID: 19160.

Reported incident date: 5/15/2015 13:00.

Location detail: MP876-1+00

Cause detail: MISCELLANEOUS

Cause detail: INCIDENT DESCRIPTION: RELIEF VALVE ('RV') 800 BD5 LIFTED PREMATURELY AT STATION 106 COMPRESSOR STATION ON MAY 15, 2015. RV LIFTED AT 748 PSIG AND DID NOT RE-SEAT. EVENT DURATION WAS 7 MINUTES UNTIL KMI ON-SITE OPERATIONS CLOSED THE VALVE UNDER THE RV TO STOP THE VENTING. THE INCIDENT RESULTED IN A TOTAL OF 5,321 MCF OF GAS LOSS. MAOP OF THE STATION FACILITIES WAS NOT EXCEEDED DURING THE INCIDENT. IMMEDIATE ACTION TAKEN: THREE COMPRESSOR UNITS WERE TAKEN OFF LINE, THE RV WAS ISOLATED, TO STOP THE VENTING OF GAS AND UNIT WAS PROMPTLY REPAIRED. TGP FOUND DEBRIS FOULING THE RELIEF VALVE EXTERNAL CONTROL BOX WHICH ALLOWED THE RELIEF VALVE TO OPEN PRIOR TO THE ESTABLISHED SET POINT. TGP WILL INCREASE THE FREQUENCY OF MAINTENANCE ON THE PILOT CONTROL TO EVALUATE THE LEVEL OF DEBRIS ACCUMULATION ON THE STATION YARD RVS INITIALLY. TWO OUT-OF-CYCLE INSPECTIONS ON EACH STATION YARD RV PILOT CONTROLS WILL BE COMPLETED TO EVALUATE THE LEVEL OF DEBRIS ACCUMULATION BEING EXPERIENCED AND TO DETERMINE WHETHER INCREASED INSPECTIONS ARE WARRANTED.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: ALL OTHER CAUSES — MISCELLANEOUS.

PHMSA indexed costs: $23,400 reported total cost, $21,526.958 in 1984 dollars, $26,679.626 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.