NORTHERN NATURAL GAS CO
gas_transmission Incident — — March 20, 2018
Incident Information
| Incident Date | March 20, 2018 |
| Operator | NORTHERN NATURAL GAS CO |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 32.97119, -102.74928 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $100 |
| Emergency Response | $2,000 |
| Other Costs | $0 |
Location Map
Incident Narrative
"ON MARCH 20, 2018, THE RELIEF VALVE ON THE 30 INCH DIAMETER M840B IN THE PLAINS STATION YARD FAILED AND VENTED GAS TO THE ATMOSPHERE. A RELEASE OF 39 MILLION CUBIC FEET WAS REPORTED TO THE NATIONAL RESPONSE CENTER. THE LAST INSPECTION WAS PERFORMED ON MARCH 19, 2018. ROOT CAUSE: INTERNAL CORROSION IN MAIN VALVE BODY, PISTON AND SEAT, PILOT SEAT WAS HARD AND CRUSHED AND PILOT SPRING WOULD NOT HOLD A STEADY SET PRESSURE. THESE ISSUE CAUSED RELIEF VALVE TX-193 ' 2000 END OF 30-INCH-DIAMETER METER HEAD TO FAIL."
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.