EAST TENNESSEE NATURAL GAS, LLC (SPECTRA ENERGY PARTNERS, LP)
gas_transmission Incident — — September 11, 2018
Incident Information
| Incident Date | September 11, 2018 |
| Operator | EAST TENNESSEE NATURAL GAS, LLC (SPECTRA ENERGY PARTNERS, LP) |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 35.28563, -86.09726 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $0 |
| Emergency Response | $0 |
| Other Costs | $0 |
Location Map
Incident Narrative
ORIGINAL REPORT: AT 7:50 PM CENTRAL TIME SEPTEMBER 11, 2018, GAS CONTROL PERSONNEL ADVISED FIELD OPERATION PERSONNEL A ""CALL ATTENDANT"" ALARM HAD BEEN RECEIVED FOR THE ESTILL COMPRESSOR STATION NEAR WINCHESTER, TENNESSEE. THE STATION OPERATOR ARRIVED ON SITE TO FIND SUCTION AND DISCHARGE BLOCK VALVES OPEN FOR A COMPRESSOR UNIT AND THE UNIT CASE VENT VALVE OPEN WHICH WAS VENTING GAS THROUGH THE STATION BLOWDOWN SILENCER. THE OPERATOR MANUALLY CLOSED THE UNIT SUCTION AND DISCHARGE VALVES, ALLOWING THE CASE TO COMPLETELY BLOW DOWN, CLEARING THE ALARM AND RETURNING THE UNIT TO NORMAL OPERATING STATUS. THE ROOT CAUSE OF THE EVENT IS UNDER INVESTIGATION. SUPPLEMENTAL/FINAL REPORT: 48 HR NRC REPORT 1224528 THE CAUSE WAS LOOSE WIRING AND FAULTY RELAYS. TWO UNIT VALVE CONTROL RELAYS WERE INSPECTED AND REPLACED. IN ADDITION, LOOSE WIRE CONNECTIONS WERE TIGHTENED. THE UNIT VALVES WERE THEN OPERATED THROUGH SEVERAL AUTOMATIC AND MANUAL CYCLES WITH NO ISSUES. SUPPLEMENTAL/FINAL REPORT 10/14/19: THE CAUSE WAS FAULTY CELLS IN THE BATTERY WHICH RESULTED IN A DROP IN VOLTAGE WHICH PREVENTED VALVES FROM OPENING.
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.