PACIFIC GAS & ELECTRIC CO
gas_transmission Incident —
Incident Information
| Report Date | — |
| Operator | PACIFIC GAS & ELECTRIC CO |
| Commodity | — |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 36.70052, -121.21127 |
Cause
| Cause | INCORRECT OPERATION |
| Subcause | — |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | — |
| Lost Commodity | — |
| Public/Private Damage | — |
| Emergency Response | — |
| Environmental Remediation | — |
| Other Costs | — |
Location Map
Incident Narrative
ON 10/28/17 AT 14:45, RELIEF VALVE M AT PRESSURE-LIMITING STATION 6AB ON L300A MP 436.85 ACTIVATED AND BEGAN VENTING GAS. THE RELIEF VALVE CLOSED AT 15:53. THE MAOP OF THIS SECTION OF L300A IS 631 PSIG AND THE RELIEF VALVE OPENED AT 602 PSIG. THE FIRE DEPARTMENT RESPONDED TO THE RELIEF VALVE ACTIVATION. THE INITIAL INVESTIGATION DETERMINED THE RELIEF VALVE ACTIVATED BELOW THE SET POINT OF 615 PSIG. THIS INCIDENT IS BEING REPORTED DUE TO THE EARLY ACTIVATION OF THE RELIEF VALVE AND UNINTENTIONAL RELEASE OF GAS OVER 3MMCF. THE INCIDENT WAS DUE TO OPERATOR ERROR. THE OPERATOR INPUT A REGULATION SET POINT MEANT FOR PLS4 INTO PLS6 CAUSING THE PRESSURE TO RISE AND THE OVER PRESSURE PROTECTION RELIEF VALVE TO ACTIVATE.
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.