NORTHERN NATURAL GAS CO
gas_transmission Incident — — March 31, 2021
Incident Information
| Incident Date | March 31, 2021 |
| Operator | NORTHERN NATURAL GAS CO |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 40.22047, -96.07405 |
Cause
| Cause | CORROSION FAILURE |
| Subcause | EXTERNAL CORROSION |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $122,000 |
| Emergency Response | $100 |
| Other Costs | $0 |
Location Map
Incident Narrative
"ON MARCH 17, 2021 ENERGY ECONOMICS REPORTED A GAS LEAK ON THE PAWNEE CITY (NEB46401) 4-INCH BRANCH LINE AT MP 3.95 WHILE CONDUCTING A GAS LEAK DETECTION SURVEY. ON MARCH 31, 2021, THE LEAK WAS INVESTIGATED BY OPERATIONS PERSONNEL, REPORTED TO PIPELINE SAFETY, AND CLASSIFIED AS GRADE 3. THE LEAK IS AT THE EDGE OF A MARSH AND HAS THREE FEET OF COVER IN THE VICINITY OF THE LEAK. THE LEAK IS VERY MINOR AND IS ONLY DETECTABLE WITH GAS LEAK DETECTION EQUIPMENT. THIS INCIDENT REPORT IS BEING SUBMITTED BECAUSE THE REPAIRS WILL EXCEED THE INCIDENT REPORTING LIMIT. AT THIS TIME (04/28/21 08:27 CDT). UPDATE 05/03/21 09:44 CDT - THE PIPE HAS BEEN REPLACED AND THE PIPELINE PLACED BACK IN SERVICE. THE ROOT CAUSE WAS GENERAL EXTERNAL CORROSION. THE CORROSION RESULTED IN A PIN-HOLE LEAK. THE REMOVED PIPE WILL NOT BE SUBMITTED FOR METALLURGICAL ANALYSIS. THE NEW PIPE IS COATED WITH FUSION BONDED EPOXY AND CATHODICALLY PROTECTED. APPROXIMATELY 700 FEET OF 4-INCH PIPE WAS INSTALLED. THE REPAIR WAS COMPLETED ON MAY 2, 2021 AND THE PIPELINE 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.