NORTHERN NATURAL GAS CO
gas_transmission Incident — — December 7, 2017
Incident Information
| Incident Date | December 7, 2017 |
| Operator | NORTHERN NATURAL GAS CO |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 43.20027, -90.07334 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | MALFUNCTION OF CONTROL/RELIEF EQUIPMENT |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $0 |
| Emergency Response | $0 |
| Other Costs | $0 |
Location Map
Incident Narrative
"ON DECEMBER 7, 2017, AT APPROXIMATELY 0357 HOURS, THE SAUK COUNTY SHERIFF'S OFFICE NOTIFIED THE OPERATIONS COMMUNICATION CENTER THAT A LOUD NOISE WAS OBSERVED AT THE SPRING GREEN COMPRESSOR STATION. OPERATIONS RESPONDED AND FOUND NO ISSUES WITH THE UNIT OR STATION THAT WOULD HAVE CAUSED A HIGH PRESSURE SITUATION. THE RELIEF VALVE IS SET AT 880 PSIG BUT ACTUATED AT 798 PSIG. THE VALVE WAS DISASSEMBLED FOR INSPECTION AND A BUILDUP OF ICE IN THE PILOT WAS DISCOVERED. THE RELIEF VALVE WAS REPAIRED AND PLACED BACK IN SERVICE."
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.