COLUMBIA GAS TRANSMISSION, LLC
gas_transmission Incident —
Incident Information
| Report Date | — |
| Operator | COLUMBIA GAS TRANSMISSION, LLC |
| Commodity | — |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 38.49528, -81.31222 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | — |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | — |
| Lost Commodity | — |
| Public/Private Damage | — |
| Emergency Response | — |
| Environmental Remediation | — |
| Other Costs | — |
Location Map
Incident Narrative
AN UNINTENTIONAL RELEASE OF NATURAL GAS OCCURRED WHEN THE EMERGENCY SHUTDOWN SYSTEM (ESD) AT CLENDENIN CS ACTIVATED. THE EVENT RELEASED A CALCULATED VOLUME OF 7890 MCF OF NATURAL GAS, EXCEEDING PHMSA'S REPORTABLE QUANTITY OF 3000 MCF. THE ESD SYSTEM RELEASED GAS, AS DESIGNED, THROUGH VARIOUS BLOW-OFF STACKS AROUND THE STATION. ONE OF THE BLOCK VALVES (24"") ON THE ESD SYSTEM FAILED TO CLOSE AND REMAINED OPEN FOR APPROXIMATELY 21 MINUTES. THE STATION WAS MANNED AT THE TIME OF THE INCIDENT. NO FIRES, DEATHS, INJURIES, EVACUATIONS, OR ROAD CLOSURES OCCURRED AS RESULT OF THE INCIDENT. AN INVESTIGATION OF THE PROBABLE CAUSE OF THE ESD REVEALED A TRIGGER VALVE, ON AN AIR SUPPLY, WHICH CONTROLS THE SYSTEM, WAS FROZEN WHICH CAUSING THE ESD TO ACTIVATE. IT WAS DETERMINED A PROGRAMMING ERROR CAUSED THE BLOCK VALVE TO REMAIN OPEN FOR THE ADDITIONAL TIME. LOGIC WAS ADDED TO THE PROGRAMMABLE LOGIC CONTROLLER (PLC) TO ALLOW THE VALVE TO CLOSE CORRECTLY FOR FUTURE ESD ACTIVATIONS.
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.