EQUITRANS MIDSTREAM CORPORATION

Incident Narrative

AT 9:41AM, SUNDAY FEBRUARY 5, 2023, GAS CONTROL NOTICED A DECLINE OF 135 PSIG AT RAGER STORAGE ALONG THE SP-7912 PIPELINE. THE NEXT POLL SHOWED ANOTHER 40 PSIG DECREASE. AT 9:45AM, GAS CONTROL SHUT IN ALL FLOW COMING OUT OF RAGER STORAGE. AT 9:51AM, COMPLIANCE-ON CALL RECEIVED A CALL FROM GAS CONTROL SAYING THAT THEY NOTICED A SUDDEN DROP OF PRESSURE ALONG THE SP-7912 PIPELINE AND THAT A TECHNICIAN WAS EN ROUTE. COMPLIANCE SUPERVISION WAS IMMEDIATELY NOTIFIED AFTERWARD. AT 11:13AM, COMPLIANCE WAS NOTIFIED THAT A 2-INCH DUMP VALVE WAS STUCK OPEN AND WAS VENTING TO ATMOSPHERE. AFTER TALKING WITH OPERATIONS, THE FOLLOWING TIMEFRAME WAS ESTABLISHED. AT APPROXIMATELY 9:30AM, THE DUMP VALVE STARTED VENTING GAS. THE LOCAL FIRE DEPARTMENT WAS NOTIFIED AND ARRIVED ON SCENE AT 10:02AM. AT 10:34AM THE FIRE DEPARTMENT NOTED THAT THE VENTING SOUND STOPPED. OPERATIONS ARRIVED ON SITE AT 11AM. THE DUMP VALVE OPENED INITIALLY BECAUSE THE LIQUID LEVEL CONTROLS REACHED THEIR THRESHOLD, WHICH SENT A SIGNAL TO THE VALVE TO OPEN. IT IS SPECULATED THAT THERE WAS A ROCK OR OTHER DEBRIS CAUGHT IN THE VALVE THAT WAS NOT ALLOWING IT TO CLOSE AFTER REMOVING THE LIQUID. SINCE THE VALVE SHUT BEFORE OPERATIONS ARRIVED ON SITE, THERE IS NO EVIDENCE OF WHAT EXACTLY OCCURRED, BUT OPERATIONS WAS ABLE TO OPEN AND CLOSE THE VALVE WITHOUT ISSUE AFTER THEY ARRIVED ONSITE.