TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2013-06-12

Gas transmission and gathering incident in ISOLA, HUMPHREYS County, MS. Reported cause: INCORRECT OPERATION. Reported consequences: 0 fatalities, 0 injuries, 3235 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: 20130063.

Operator ID: 19160.

Reported incident date: 6/12/2013 0:08.

Location detail: 843-1B - 0+00

Cause detail: OTHER INCORRECT OPERATION

Cause detail: TGP COMPRESSOR STATION 843; OPERATOR WAS ON SITE; EVENT OCCURRED AFTER STATION CAME ON LINE; RELIEF VALVE OPERATED PREMATURELY; RELIEF VALVE DID NOT SEAT; STATION ESD OCCURRED; INVESTIGATION AND REPAIR OF RELIEF VALVE FOUND A SMALL AMOUNT OF SLUDGE IN O-RING OF RELIEF VALVE WHICH MAY HAVE CONTRIBUTED TO THE EVENT; PRESSURE TRANSMITTERS WERE INSPECTED AND FOUND TO BE IN CALIBRATION; RELIEF VALVE WAS TESTED AND CONSISTENTLY LIFTED DURING TESTING;

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: INCORRECT OPERATION — OTHER INCORRECT OPERATION.

PHMSA indexed costs: $32,334 reported total cost, $25,646.043 in 1984 dollars, $32,639.112 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.