ONEOK GAS TRANSPORTATION, LLC
gas_transmission Incident — — August 29, 2020
Incident Information
| Incident Date | August 29, 2020 |
| Operator | ONEOK GAS TRANSPORTATION, LLC |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 34.99387, -95.05413 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | THREADED CONNECTION/COUPLING FAILURE |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $2,500,000 |
| Emergency Response | $1,500 |
| Other Costs | $0 |
Location Map
Incident Narrative
AT APPROXIMATELY 17:30 ON 8/29/20 AN EMERGENCY CALL WAS RECEIVED BY ONEOK GAS TRANSPORTATION GAS CONTROL CENTER OF A FIRE AT THE ONEOK RED OAK COMPRESSOR STATION. THE EMERGENCY SHUTDOWN DEVICE AT THE STATION ACTIVATED, ISOLATING THE STATION AND SHUTTING IT DOWN. ONEOK'S INVESTIGATION DETERMINED A 1 1/2 NIPPLE FAILED ALLOWING GAS TO BLOW DIRECTLY INTO THE COMPRESSOR BUILDING WHICH WAS IGNITED AND CAUSED THE FIRE. THE INVESTIGATION ALSO DETERMINED THE 1 1/2 NIPPLE WAS REPLACED WITH A SCHEDULE 80 GRADE NIPPLE AND NOT THE PREFERRED SCHEDULE 160. THE NIPPLE HAD ALSO NOT BEEN PROPERLY SECURED TO THE COMPRESSOR SKID ALLOWING IT TO VIBRATE. ONEOK ALSO REDESIGNED THE PIPING CONFIGURATION OF THE RELIEF LINE TO ELIMINATE STRESS LOADS ON THE RELIEF PIPING. STATION VIBRATION STUDIES WERE CONDUCTED AT THE SITE AFTER THE INSTALLATION AND SECURING OF THE PIPING WITH THE NEW DESIGN. ONEOK CONTACTED THE NRC REGARDING THE ACCIDENT ON 8/29/20 AT 18:50 AND UPDATED THE REPORT ON 8/31/20 AT 16:54.
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.