ANR PIPELINE CO
gas_transmission Incident — — May 11, 2011
Incident Information
| Incident Date | May 11, 2011 |
| Operator | ANR PIPELINE CO |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 42.66713, -85.95636 |
Cause
| Cause | INCORRECT OPERATION |
| Subcause | PIPELINE OR EQUIPMENT OVERPRESSURED |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $0 |
| Emergency Response | $40,000 |
| Other Costs | $0 |
Location Map
Incident Narrative
"THE HAMILTON STATION, OPERATING AT 809 PSI, TRIPPED ON MAIN LINE OVER PRESSURE DUE TO A HIGH PRESSURE CONDITION IN THE TRIP CIRCUITRY PIPING. IT IS BELIEVED THAT HIGH TEMPERATURES IN THE BUILDING CAUSED THE PRESSURE TO INCREASE ABOVE THE 876 PSI SET POINT. WHEN THE STATION PRESSURE EQUALIZED, THE STATION BLOCK GATE (BYPASS VALVE) OPENED WHICH ALLOWED GAS TO FLOW THROUGH THE OPEN VENTS ON THE 30 INCH PIG LAUNCHER. THE PIG LAUNCHER HAD BEEN LEFT IN AN ABNORMAL LINE-UP, WITH THE ILI PIG IN THE DEPRESSURIZED TRAP, FOR AN EARLY MORNING LAUNCH."
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.