ENABLE GAS TRANSMISSION, LLC

Incident Narrative

ON 2/20/2022 THE ROUND MOUNTAIN COMPRESSOR STATION ESD'D WHEN A COMMERCIAL POWER FAILURE OCCURRED IN THE AREA. THE STATION WAS IDLE AT THE TIME OF THE POWER FAILURE. SYSTEM CONTROL RECOGNIZED THE ESD (AND A FLOW INCREASE FOR EGT LINE J) AND DISPATCHED OPS TO THE STATION TO DETERMINE CAUSE. WHEN OPS ARRIVED, THEY FOUND THE SUCTION VALVE OF THE STATION HAD NOT CLOSED ALLOWING LINE J (IN-SERVICE) GAS TO VENT INTO THE ATMOSPHERE. THE SUCTION VALVE WAS CLOSED BY THE RESPONDING OPERATOR AND THE UNINTENTIONAL RELEASE OF GAS WAS ELIMINATED. AFTER CLOSING THE SUCTION VALVE, OPERATIONS DETERMINED A REPORTABLE RELEASE HAD OCCURRED AND A CALL WAS PLACED TO THE NRC (NRC#1329308). A 48 HR. FOLLOW UP WAS PROVIDED (NRC#1329431) ON 2/22/2022. AFTER FURTHER INVESTIGATION, IT WAS DETERMINED THE SUCTION VALVE FAILED TO CLOSE DUE TO DEBRIS IN THE ACTUATOR GAS SUPPLY LINE. THE DEBRIS WAS CLEARED FROM THE LINE AND A TEST WAS PERFORMED TO CONFIRM THE VALVE WAS OPERABLE. GOING FORWARD, A FILTER WILL BE PLACED ON THE LINE TO REMOVE CONTAMINANTS FROM THE GAS SUPPLY ALLOWING THE ACTUATOR TO WORK AS INTENDED.