ENTERPRISE PRODUCTS OPERATING LLC — Gas transmission and gathering — incident on 2016-08-12

Gas transmission and gathering incident in DILLY, FRIO County, TX. Reported cause: INCORRECT OPERATION. Reported consequences: 0 fatalities, 0 injuries, 14000 NATURAL GAS released, $500 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: 20160072.

Operator ID: 31618.

Reported incident date: 8/12/2016 10:45.

Location detail: MP 52.06

Cause detail: OTHER INCORRECT OPERATION

Cause detail: ON 8/11/2016 AT 03:00 AM, GAS CONTROL NOTIFIED FIELD OPERATIONS THE PEARSALL COMPRESSOR STATION SHUT DOWN AND THE STATION WAS BLOWING DOWN. OPERATIONS ARRIVED ONSITE AT 04:59 AM AND FOUND THE COMPRESSOR SUCTION AND DISCHARGE VALVES CLOSED AND BLOWDOWN VALVE PARTIALLY OPEN. OPERATIONS DISCOVERED A 3/8"BALL VALVE WAS CLOSED, CUTTING OFF SUPPLY GAS TO THE BETTIS ACTUATOR. GAS SLOWLY LEAKED OUT OF THE BETTIS ACTUATOR CYLINDER THROUGH A PORT RESULTING IN THE BLOW DOWN VALVE OPENING PARTIALLY IN THE FAIL-SAFE POSITION. THE INITIAL GAS LOSS WAS ESTIMATED TO BE 321.70 MSCF BASED ON THE NORMAL ESTIMATED BLOW DOWN FOR THE STATION. ON 8/12/2016 AT 10:45 AM, OPERATIONS CONFIRMED THE AMOUNT OF GAS BLOWN DOWN TO BE 14 MMSCF. NOTIFICATIONS WERE THEN MADE TO THE TCEQ, NRC, AND RRC. THE SUPPLY GAS VALVE WAS FOUND TO BE IN THE CLOSED POSITION. IT IS NOT KNOWN HOW THE NORMALLY OPEN VALVE WAS INADVERTENTLY CLOSED. TO PREVENT RECURRENCE, THE VALVE WAS LOCKED OPEN AND WILL BE REPOSITIONED SO THE VALVE HANDLE IS PROTECTED FROM BEING INADVERTENTLY OPERATED WHEN THE VALVE IS OPEN. ADDITIONALLY, THE PORT PLUG LOCATED ON THE BACK OF THE ACTUATOR WAS REMOVED, TEFLON TAPPED, RE-INSTALLED AND CHECKED FOR LEAKS.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: INCORRECT OPERATION — OTHER INCORRECT OPERATION.

PHMSA indexed costs: $36,340 reported total cost, $38,407.263 in 1984 dollars, $47,465.479 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.