COLORADO INTERSTATE GAS CO
gas_transmission Incident —
Incident Information
| Report Date | — |
| Operator | COLORADO INTERSTATE GAS CO |
| Commodity | — |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 37.11503, -102.18354 |
Cause
| Cause | NATURAL FORCE DAMAGE |
| Subcause | — |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | — |
| Lost Commodity | — |
| Public/Private Damage | — |
| Emergency Response | — |
| Environmental Remediation | — |
| Other Costs | — |
Location Map
Incident Narrative
12/18/2016, 08:35 HOURS MOUNTAIN, EMPLOYEE ARRIVED ON SITE AND BEGAN MAKING INSPECTIONS AND FOUND A RELIEF VALVE VENTING TO ATMOSPHERE. APPROPRIATE VALVES WERE IMMEDIATELY CLOSED AND COMPRESSOR UNIT WAS SHUT DOWN. VENTING WAS TERMINATED. INVESTIGATION FOUND THE GAS COOLER FOR UNIT CG5, WHICH IS COMPRESSING UNPROCESSED WET GAS, HAD FROZEN DURING THE EXTREME WEATHER TEMPERATURES OF -15 DEGREES CAUSING THE RELIEF VALVE TO OPEN. MAOP WAS NOT EXCEEDED. 12/18/2016, 09:15 HOURS MOUNTAIN, IT WAS DETERMINED THE GAS RELEASE VOLUME WAS A REPORTABLE VOLUME. WITH THE UNIT OFF LINE, A BYPASS LINE WAS OPENED TO ALLOW THE GAS COOLER TO THAW. PIPING AND EQUIPMENT WAS COVERED TO PROVIDE WINTER WEATHER PROTECTION TO ASSIST THAWING. THE UNIT CG5 WAS RETURNED TO SERVICE 12/19/2016 AT 12:00 HOURS MOUNTAIN. FURTHER ANALYSIS OF DATA INDICATES VENTING BEGAN 12/17/2016, 17:31 HOURS MOUNTAIN. AT THE TIME OF THIS EVENT AND PRIOR TO THE EVENT, THIS PORTION OF THE FACILITY WAS NOT CONTROL ROOM MONITORED. FOLLOWING THIS EVENT, CIG HAS INSTALLED MONITORING ON THE VENT OF THE RELIEF VALVE AND RELATED CONTROL ROOM ALARMS HAVE BEEN INSTALLED; ALL TO ALERT OPERATIONS PERSONNEL OF ANY FUTURE VENTING EVENT.
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.