TENNESSEE GAS PIPELINE COMPANY
gas_transmission Incident —
Incident Information
| Report Date | — |
| Operator | TENNESSEE GAS PIPELINE COMPANY |
| Commodity | — |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 35.84866, -87.45050 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | — |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | — |
| Lost Commodity | — |
| Public/Private Damage | — |
| Emergency Response | — |
| Environmental Remediation | — |
| Other Costs | — |
Location Map
Incident Narrative
AT 9:42AM ON MAY 30, 2019, THE ESD SYSTEM AT TENNESSEE GAS PIPELINE COMPANY (TGP) STATION 860 WAS ACTIVATED FOR A SCHEDULED ESD TEST. AFTER 3 MINUTES, AT 9:45AM, STATION PERSONNEL NOTICED THAT THE SUCTION SIDE OF THE STATION WAS EVACUATED AS DESIGNED; HOWEVER, THE DISCHARGE SIDE CONTINUED TO BLOW DOWN. AT THIS POINT, STATION PERSONNEL BEGAN TO LOCATE THE SOURCE OF THE RELEASE. STATION PERSONNEL DETERMINED THAT BD 500-1, A 30"" ISOLATION VALVE, DID NOT CLOSE AS INTENDED DURING THE ESD. THIS ALLOWED GAS TO BLOW THROUGH FOUR 8"" AND ONE 10"" BLOWDOWN STACKS. STATION PERSONNEL CLOSED THE BLOWDOWN VALVES TO STOP THE RELEASE. THE TOTAL VENT TIME WAS 16 MINUTES AND THE TOTAL UNINTENTIONAL GAS LOSS WAS 48,698 MCF. INCIDENT INVESTIGATION REVEALED THAT VALVE BD 500-1 FAILED TO CLOSE AS THE VALVE ACTUATOR MOTOR DID NOT OPERATE. A 3RD PARTY CONTRACTOR EXAMINED THE MOTOR AND DETERMINED THAT INTERNAL WORN VANES CAUSED THE FAILURE TO OPERATE. TO PREVENT A REOCCURRENCE, THE VALVE ACTUATOR MOTOR WAS REPLACED. A 48-HR UPDATE CALL WAS MADE TO THE NRC. THE NRC REPORT NUMBER FOR THIS CALL IS #1247459.
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.