QUESTAR PIPELINE COMPANY
gas_transmission Incident — — July 21, 2011
Incident Information
| Incident Date | July 21, 2011 |
| Operator | QUESTAR PIPELINE COMPANY |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 41.52412, -109.31958 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $0 |
| Emergency Response | $100 |
| Other Costs | $0 |
Location Map
Incident Narrative
USING SCADA INFORMATION, CONTROL ROOM PERSONNEL FOUND A DROP IN PRESSURE. THEY DISPATCHED OPERATIONAL PERSONNEL TO INVESTIGATE THE ISSUE. THE OPERATIONAL PERSONNEL FOUND A RELIEF VALVE RELEASING GAS EVEN THOUGH THE PRESSURE WAS BELOW THE RELIEF SET POINT. OPERATIONAL PERSONNEL FOUND AN OBSTRUCTION IN THE RELIEF VALVE 3/8"" TUBE SENSING LINE CAUSING THE RELIEF VALVE TO OPEN PREMATURELY. OPERATIONAL PERSONNEL REPAIRED THE ISSUE AND RETURNED THE RELIEF VALVE TO PROPER OPERATIONS.
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.