ENABLE GAS TRANSMISSION, LLC
gas_transmission Incident — — May 30, 2020
Incident Information
| Incident Date | May 30, 2020 |
| Operator | ENABLE GAS TRANSMISSION, LLC |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 35.69194, -100.22752 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $500 |
| Emergency Response | $1,000 |
| Other Costs | $0 |
Location Map
Incident Narrative
ON MAY 3OTH , AT 21:06, ENABLE SYSTEM CONTROL RECEIVED A CALL FROM A LANDOWNER NEAR THE WOODALL PLANT THAT A RELIEF VALVE WAS GOING OFF ON LINE AD-23 IN HEMPHILL COUNTY, TEXAS. A O&M TECHNICIAN WAS DISPATCHED TO THE METER LOCATION AND BACKED OFF THE RELIEF VALVE, LOCKED IT OUT, AND RESET IT. APPROXIMATELY 16.1 MMCF OF NATURAL GAS WAS RELEASED. NO INJURIES, NO DAMAGE TO COMPANY PROPERTY. NRC WAS NOTIFIED ON 5/30 (#1278467) AND A 48HR. FOLLOW UP ON 6/1 (#1278559). UPON INVESTIGATION, IT WAS DETERMINED THE SETPOINT HAD LOWERED TO 973 PSIG ON THE PILOT VALVE. THE VALVE WAS INSPECTED AND SET AT 996 PSIG ON MAY 5TH 2020. LINE AD-23 HAS A 1000 PSIG MAOP AND WAS OPERATING AROUND 975 AT THE TIME. ON MAY 31ST, THE PILOT WAS RESET TO THE PROPER SETPOINT (996 PSIG) AND PLACED BACK INTO SERVICE. A SIMILAR INCIDENT OCCURRED IN 2018 WITH THIS RELIEF VALVE AND A LOWER SETPOINT. LINE AD-23 ROUTINELY OPERATES AT THE 975 PSIG RANGE. A STUDY IS CURRENTLY BEING CONDUNCTED TO DETERMINE IF THE 400 SERIES RELIEF SHOULD BE REPLACED WITH A 200 SERIES TO LIMIT THIS OCCURRENCE FROM HAPPENING AGAIN.
About This Pipeline Incident
Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.