TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2017-09-06

Gas transmission and gathering incident in VICTORIA, VICTORIA County, TX. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3424 NATURAL GAS released, $4,720 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: 20170084.

Operator ID: 19160.

Reported incident date: 9/6/2017 13:40.

Location detail: MLV 9-1+000

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: TENNESSEE GAS PIPELINE COMPANY (TGP) VICTORIA STATION 9 WAS OFFLINE DURING HURRICANE HARVEY. AFTER THE HURRICANE IT WAS BROUGHT BACK ONLINE. WHEN THE PRESSURE ON THE DISCHARGE HEADER REACHED 746PSIG THE DISCHARGE HEADER RELIEF VALVE VENTED PREMATURELY. THE SET PRESSURE WAS 758PSIG (102%). OPERATING PERSONNEL WERE ONSITE, HEARD THE RELEASE AND RESPONDED BY SHUTTING THE STATION DOWN. THE RELIEF VALVE RELEASED APPROXIMATELY 3424MCF NATURAL GAS, MEETING AND EXCEEDING THE 3000MCF REQUIRED FOR INCIDENT REPORTING. FURTHER INVESTIGATION DETERMINED THAT THE PILOT COULD NOT HOLD THE SET PRESSURE. BASED ON AN EVALUATION OF THE OVERPRESSURE PROTECTION (OPP) REQUIRED BY 49CFR 192 IT WAS DETERMINED THAT THIS DEVICE WAS REDUNDANT AND IT WILL NOT BE PUT BACK INTO SERVICE.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $15,301 reported total cost, $12,354.078 in 1984 dollars, $18,017.982 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.