ENTERPRISE PRODUCTS OPERATING LLC — Gas transmission and gathering — incident on 2012-12-23

Gas transmission and gathering incident in COYANOSA, PECOS County, TX. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 4230 NATURAL GAS released, $5,000 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: 20130004.

Operator ID: 31618.

Reported incident date: 12/23/2012 2:00.

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON DECEMBER 23, 2012 AT 02:00AM, THE RELIEF VALVE ON WAHA COMPRESSOR #601 DISCHARGED. THIS RESULTED IN A RELEASE OF 4,230 MCF OF NATURAL GAS. THE OPERATING PRESSURE NEVER EXCEEDED 1020PSIG AT THE STATION THUS, NEVER EXCEEDING THE MAOP IS 1050 PSIG. UPON INVESTIGATION, A GAS ANALYZER DESIGNED TO DETECT H2S AT THE DELIVERY POINT FAILED RESULTING IN A SHUTDOWN OF THE COMPRESSOR STATION. THE SHUTDOWN RESULTED IN AN INCREASE OF PRESSURE AND SUBSEQUENT ACTIVATION OF THE RELIEF VALVE CAUSING THE RELEASE OF NATURAL GAS TO ATMOSPHERE. THE RELIEF VALVE FUNCTIONED PROPERLY AS DESIGNED.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $18,536 reported total cost, $13,937.348 in 1984 dollars, $20,364.908 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.