ALLIANCE PIPELINE L.P.
gas_transmission Incident — — August 18, 2025
Incident Information
| Incident Date | August 18, 2025 |
| Operator | ALLIANCE PIPELINE L.P. |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 43.11508, -92.31885 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | THREADED CONNECTION/COUPLING FAILURE |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $0 |
| Emergency Response | $0 |
| Other Costs | $500,000 |
Location Map
Incident Narrative
"AS REPORTED AN ALLIANCE PIPELINE TECHNICIAN DETECTED A SMALL LEAK DURING A SITE CALL OUT WHICH WAS SIGNIFIED BY BUBBLING GROUND WATER AFTER A SIGNIFICANT RAIN EVENT ON AUGUST 19, 2025. THE SITE WAS DEEMED SAFE BY ACTIVE LEAK MONITORING ON SITE FROM AUGUST 19-21 AND A THIRD-PARTY LEAK DETECTION TEAM CONDUCTING A SITE SURVEY ON AUGUST 22 WITH INSTRUMENTATION THAT DETERMINED NO MIGRATION OF GAS LEAKAGE OFF THE BLOCK VALVE LOCATION. AN ADDITIONAL SURVEY WAS CONDUCTED BY THE THIRD PARTY AGAIN ON SEPTEMBER 23 WITH DETERMINATION THAT GAS LEAKAGE WAS NOT MIGRATING OFF SITE. THE LEAK VOLUME WAS NOT ABLE TO BE DETERMINED UTILIZING QUALITATIVE AND QUANTITATIVE LEAK DETECTION EQUIPMENT DUE TO THE VERY SMALL NATURE OF THE LEAK. THE EXCAVATION TO INVESTIGATE THE LEAK WAS CONDUCTED THE WEEK OF OCTOBER 14. ON OCTOBER 17 THE SMALL LEAK WAS CONFIRMED AND REPAIRED ON THE 1 1/2
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.