ENABLE GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2018-10-26

Current as of 2018-10-26 Government source

Pipeline and Hazardous Materials Safety AdministrationOfficial agency material

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Gas transmission and gathering incident in HAMMON, ROGER MILLS County, OK. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 4512 NATURAL GAS released, $1,000 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: 20180111.

Operator ID: 602.

Reported incident date: 10/26/2018 18:40.

Location detail: LINE 2

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: ON 10/26/18 ENABLE GAS TRANSMISSION SYSTEM CONTROL RECEIVED A CALL FROM THE GENERAL PUBLIC OF A BLOWING RELIEF VALVE IN ROGER MILLS COUNTY, OKLAHOMA. AN EMPLOYEE WAS DISPATCHED AND WHEN THEY ARRIVED TO THE SITE COULD SEE A RELIEF VALVE BLOWING. THE TECHNICIAN INSTALLED A PRESSURE GAUGE AND VERIFIED PRESSURE TO BE BELOW MAOP. THE VALVE WAS SHUT IN STOPPING THE VENTING GAS. PRESSURE WAS RECHECKED TO ASSURE THERE WERE NO PRESSURE PROBLEMS. THE VALVE WAS ISOLATED UNTIL REPAIRS COULD BE COMPLETED. DURING REPAIR, THE VALVE WAS ACTIVATING AROUND 700 PSIG AND THE CONTRACTOR REBUILT THE PILOT ON THE VALVE. THE VALVE WAS RE-TESTED AND PLACED INTO SERVICE. ORIGINALLY, THE GAS LOSS WAS CALCULATED TO BE NEAR 800 MCF. ON 10/29/18 IT WAS DETERMINED THE ORIGINAL CALCULATION USED INCORRECT RELIEF VALVE SIZING AND WAS RECALCULATED FOR A GAS LOSS OF 4512 MCF. THE NRC WAS NOTIFIED ON 10/29/18 09:10 (NRC#1228821). THE 48 HOUR FOLLOW UP WAS PROVIDED ON 10/31/18 07:20 (NRC# 1229004).

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $15,800 reported total cost, $13,841.903 in 1984 dollars, $18,175.498 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.

This material provides agency context. It does not replace binding regulatory text, and its legal effect depends on the underlying authority and facts.