NORTHERN NATURAL GAS CO
gas_transmission Incident — — September 24, 2021
Incident Information
| Incident Date | September 24, 2021 |
| Operator | NORTHERN NATURAL GAS CO |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 42.04558, -94.04548 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | DEFECTIVE OR LOOSE TUBING OR FITTING |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $250 |
| Emergency Response | $250 |
| Other Costs | $0 |
Location Map
Incident Narrative
"PILOT PRESSURE TUBING FROM THE PILOT TO THE RELIEF VALVE PISTON CRACKED, DROPPING RETENTION PRESSURE ON THE PILOT AND RELIEVE VALVE DOME, RESULTING IN THE UNIT 18 LEAD LINE RELIEF VALVE OPENING. A SENIOR PIPELINE TECHNICIAN WITH THE OGDEN, IOWA, TEAM, INVESTIGATED AND DISCOVERED BROKEN TUBING, WHICH CAUSED THE PILOT GAS TO LOSE PRESSURE. THIS ACTIVATED THE UNIT 18 RELIEF VALVE CAUSING IT TO VENT GAS AT THE OGDEN, IOWA, COMPRESSOR STATION. THE TUBING WAS REPLACED AND THE STATION WAS RETURNED TO NORMAL 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.