ENABLE OKLAHOMA INTRASTATE TRANSMISSION, LLC — Gas transmission and gathering — incident on 2018-11-07

Gas transmission and gathering incident in CLAREMORE, ROGERS County, OK. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 4714 NATURAL GAS released, $1,500 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: 20180125.

Operator ID: 26330.

Reported incident date: 11/7/2018 6:45.

Location detail: CLAREMORE CS

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: AT 06:45 ON 11/7/2018 THE ENABLE OKLAHOMA INTRASTATE TRANSMISSION (EOIT) SYSTEM CONTROL RECEIVED A CALL ABOUT AN ODOR OF GAS AT THE CLAREMORE COMPRESSOR STATION IN CLAREMORE, OKLAHOMA. WHEN THE EOIT O&M TECHNICIAN ARRIVED AT THE STATION, HE PERFORMED A COMPLETE INSPECTION AND FOUND A INTERSTAGE RELIEF VALVE DISCHARGING. THE RELIEF VALVE WAS CLOSED AND THE UNIT WAS SHUTDOWN WHILE REPAIRS WERE PERFORMED. IT WAS DETERMINED THE RELIEF VALVE VENTED PREMATURELY DUE TO A BREAKDOWN OF MATERIALS IN THE PILOT VALVE. IT IS ASSUMED THIS BREAKDOWN IS DUE TO VIBRATION. THE RELIEF WAS REBUILT AND THE UNIT WAS RESTARTED ON 11/8/2018. WHEN IT WAS SAFE TO DO SO, THE AMOUNT AND DURATION OF GAS LOSS WAS CALCULATED TO BE 4.7 MMCF. THESE TOTALS WERE CONFIRMED AT 10:30 AND A CALL WAS PLACED TO NRC AT 10:46 (NRC#1229736). A FOLLOW UP CALL WAS PLACED WITH THE NRC ON 11/8/18 AT 11:12 (NRC#1229852).

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $15,511 reported total cost, $13,572.033 in 1984 dollars, $17,844.138 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.