ANR PIPELINE CO

gas_transmission Incident —

Incident Information

Report Date
OperatorANR PIPELINE CO
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates42.66713, -85.95636

Cause

CauseINCORRECT OPERATION
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage
Lost Commodity
Public/Private Damage
Emergency Response
Environmental Remediation
Other Costs

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.

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