TENNESSEE GAS PIPELINE COMPANY
gas_transmission Incident — — April 17, 2021
Incident Information
| Incident Date | April 17, 2021 |
| Operator | TENNESSEE GAS PIPELINE COMPANY |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 30.98278, -94.14083 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $0 |
| Emergency Response | $150 |
| Other Costs | $0 |
Location Map
Incident Narrative
"ON APRIL 18, 2021 AT APPROXIMATELY 1:10 AM LOCAL TIME, TGP GAS CONTROL NOTICED A PRESSURE DROP AT CS32 JASPER ON THE DISCHARGE PIPING AND NOTIFIED LOCAL OPERATIONS OF THE PRESSURE DROP. OPERATIONS PERSONNEL WERE IMMEDIATELY DISPATCHED TO THE LOCATION. AT 1:20 AM LOCAL TIME ON APRIL 18, 2021, OPERATIONS PERSONNEL ARRIVED AT THE SITE AND CONFIRMED THAT THE RELIEF VALVE ON UNIT NO. 6-B COMPRESSOR WAS VENTING, AND THE UNIT WAS SHUT DOWN AND THE RELIEF VALVE ISOLATED. AN INTERNAL ERL CALL WAS COMPLETED WITH MANAGEMENT AT 1:50 AM LOCAL TIME TO CONFIRM REPORTABILITY AND THE NRC WAS NOTIFIED AT 2:04 AM LOCAL TIME OF THE EVENT (NRC REPORT NO. 1302959). A 48-HR. UPDATE WAS ALSO PROVIDED NOTING NO SIGNIFICANT CHANGES (NRC REPORT NO. 1303037). THE RESULTS OF TGP'S INVESTIGATION IDENTIFIED THE IMMEDIATE CAUSE OF THE EVENT TO BE DEFECTIVE EQUIPMENT OR MATERIALS. AFTER TESTING OF THE VALVE, TGP COULD NOT IDENTIFY WHY THE PILOT VALVE WOULD NOT RESET AND THE CAVITY ON TOP OF THE VALVE COULD NOT REACH A HIGH ENOUGH PRESSURE TO RE-SEAT THE MAIN VALVE PLUNGER. THEREFORE, THE VALVE WAS REPLACED WITH A NEW ANDERSON GREENWOOD PILOT RELIEF VALVE."
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.