ENABLE MIDSTREAM PARTNERS, LP — Gas transmission and gathering — incident on 2015-01-21

Gas transmission and gathering incident in Not Within a Municipality, LATIMER County, OK. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 4580 NATURAL GAS released, $100 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: 20150019.

Operator ID: 31202.

Reported incident date: 1/21/2015 7:18.

Location detail: WILBURTON STA

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: AN ENABLE EMPLOYEE RECEIVED A CALL FROM THE ENABLE WILBURTON PLANT OPERATOR ON 1-21-15 AT 7:18AM. THE PLANT OPERATOR REPORTED THAT THE RELIEF WAS BLOWING ON F AND H YARD AND HAD HIM SHUT DOWN THE WILBURTON BOOSTER UNIT AT THE WILBURTON OFFICE. THE BOOSTER WAS SHUT DOWN ON 1-21-15 AT 7:20AM. DISCHARGE PRESSURE WAS 651PSI ON THE ENGINE PANEL. EMPLOYEES CLOSED THE INLET ISOLATION TO THE RELIEF VALVE AFTER THE BOOSTER UNIT WAS SHUT DOWN AND GAS WAS NO LONGER FLOWING INTO LINE FH-120. IT WAS DETERMINED THAT NGPL SHUT IN AT THEIR FACILITY CAUSING AN INCREASE IN PRESSURE. THE WILBURTON BOOSTER WAS STILL RUNNING. EMPLOYEES CHECKED THE SET POINT AND FOUND THE VALVE WAS VENTING AT APPROXIMATELY 750 TO 770 PSI AND THAT THE SET POINT WAS AT 1050 PSI. IT WAS DETERMINED THAT THE RELIEF VALVE WAS VENTING PREMATURELY. THE PILOT WAS REMOVED AND FOUND TO BE FULL OF WATER. THE PIPELINE WAS LOCKED AND TAGGED OUT AS WELL AS THE STATION SUCTION AND BYPASS. THE PILOT WAS OVERNIGHTED TO AEON WITH INSTRUCTIONS TO REPAIR THE PILOT, PERFORM A FAILURE ANALYSIS AND RECOMMEND A PROCEDURE TO KEEP THE WATER OUT OF THE PILOT. THE REPAIRED PILOT CAME BACK 1-26-2015. ENABLE EMPLOYEES INSTALLED THE PILOT AND TESTED THE VALVE. EMPLOYEES RETURNED THE BOOSTER TO SERVICE AND REESTABLISHED NORMAL OPERATIONS ON 1/26/2015. ENABLE IS AWAITING THE RESULTS OF THE FAILURE ANALYSIS TO DETERMINE THE CAUSE OF WATER ACCUMULATING IN THE PILOT. SUPPLEMENTAL INFORMATION: AEON DETERMINED THE CAUSE OF THE WATER IN THE VALVE WAS FROM: A BAD ADJUSTMENT SCREW. IT HAS BEEN DETERMINED THAT THE ADJUSTMENT SCREW WAS FAULTY.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $15,738 reported total cost, $14,124.627 in 1984 dollars, $18,024.325 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.