TARGA DOWNSTREAM LLC
hazardous_liquid Incident — — September 30, 2019
Incident Information
| Incident Date | September 30, 2019 |
| Operator | TARGA DOWNSTREAM LLC |
| Commodity | HVL OR OTHER FLAMMABLE OR TOXIC FLUID WHICH IS A GAS AT AMBI |
| Pipeline Type | hazardous_liquid |
Location
| State | |
| Coordinates | 32.31582, -97.52846 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $420 |
| Emergency Response | $0 |
| Other Costs | $0 |
Location Map
Incident Narrative
ON SEPTEMBER 30TH, 2019 A VALVE STATION LOST ELECTRIC POWER ON TARGA'S GRAND PRIX PIPELINE RESULTING IN MAINLINE VALVE CLOSURE AT THE STATION. THE VALVE CLOSURE CAUSED PRESSURE TO RISE AT THE UPSTREAM VALVE STATIONS ON THE PIPELINE. THE RISE IN PRESSURE CAUSED A THERMAL RELIEF VALVE TO OPEN AND SEND NGL VAPORS TO THE STATION VENT STACK. MAXIMUM PRESSURE AT THE STATION WAS 1,426 PSI. THE RELIEF VALVE SET PRESSURE WAS 1,440 PSI. AND THE RELIEF VALVE WAS TESTED IN PLACE ON AUGUST 9, 2019 AND OPENED 1,440 PSI. TARGA PERSONNEL WERE AT THE SITE AT THE TIME OF THE RELEASE AND DETERMINED THE RELEASE TIME TO BE 15 SECONDS. FOR THAT AMOUNT OF TIME, THE VOLUME OF NGL PRODUCT RELEASED WAS 72 GALLONS. THE OTHER RELIEF VALVES IN THE STATION WERE SET AT 1,440 PSI AND SUBJECT TO THE SAME PRESSURE AS THE VALVE THAT OPENED. BECAUSE OF THIS FACT, TARGA HAS CONCLUDED THAT THE RELIEF VALVE THAT OPENED MALFUNCTIONED CAUSING IT TO OPEN PREMATURELY. TARGA REPLACED THE RELIEF VALVE THAT MALFUNCTIONED. THIS IS THE FINAL REPORT.
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.