# TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2018-03-01

- **operation:** document
- **citation:** PHMSA Report 20180035
- **title:** TENNESSEE GAS PIPELINE COMPANY — Gas transmission and gathering — incident on 2018-03-01
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2018-03-29
- **effective on:** 2018-03-01
- **summary:** Gas transmission and gathering incident in AGUA DULCE, NUECES County, TX. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 24118 NATURAL GAS released, $608 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. PHMSA trend classification: significant incident, not serious.
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**body:**

Gas transmission and gathering incident in AGUA DULCE, NUECES County, TX. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 24118 NATURAL GAS released, $608 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: 20180035.

Operator ID: 19160.

Reported incident date: 3/1/2018 19:31.

Location detail: VALVE A2-D1

Cause detail: DEFECTIVE OR LOOSE TUBING OR FITTING

Cause detail: ON 3/1/18 AT APPROXIMATELY 7:31 PM A COMPRESSOR ON UNIT 2 IN THE COMPRESSOR BUILDING HAD AN ISSUE WHEREBY THE COMPRESSOR ROD PACKING BEGAN LEAKING CAUSING THE GAS DETECTOR TO SENSE 40% LEL WHICH INITIATED A STATION HAZARD ATMOSPHERE ALARM AND CAUSED EMERGENCY SHUT DOWN (ESD). AT 8:00PM AN ERL CALL WAS SENT OUT. AT 8:03 LOCAL OPERATING PERSONNEL IDENTIFIED THAT THE STATION ESD VALVE WAS STILL VENTING GAS BEYOND THE TYPICAL STATION BLOW DOWN TIME. UPON FURTHER INVESTIGATION PERSONNEL FOUND THAT STATION DISCHARGE VALVE (A2-D1) DID NOT FULLY CLOSED AS REQUIRED WITH AN ESD EVENT. PERSONNEL IDENTIFIED THAT THE SUPPLY GAS TUBING TO THE STATION DISCHARGE VALVE'S ACTUATOR CAME DISLODGED DURING THE INITIATION OF THE ESD PROCESS WHICH PREVENT THE FULL CLOSURE OF THIS VALVE. PERSONNEL ISOLATED THE SUPPLY GAS AND THEN RECONNECTED IT TO THE ACTUATOR. ONCE RECONNECTED THE GAS SUPPLY WAS OPENED AGAIN AND THE STATION DISCHARGE VALVE CLOSED AS REQUIRED. THIS STOPPED THE VENTING OF NATURAL GAS FROM THE STATION'S ESD VALVE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — DEFECTIVE OR LOOSE TUBING/FITTING.

PHMSA indexed costs: $65,726 reported total cost, $61,098.024 in 1984 dollars, $75,377.734 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.
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