COLUMBIA GAS TRANSMISSION, LLC

Incident Narrative

ALL TIMES RECORDED WERE IN EASTERN STANDARD TIME ON 11/15/18 AT 23:54, TRANSCANADA'S GAS CONTROL (GC) CENTER (COLUMBIA GAS TRANSMISSION OPID 2616) WAS NOTIFIED BY WEST VIRGINIA WYOMING COUNTY 911 OF A GAS RELEASE AND FIRE AT CAIRO HOLLOW IN THE TOWN OF BUD, WV. COMPANY PERSONNEL WAS DISPATCHED BY LOCAL OPERATIONS AT THAT TIME. AT 00:36 ON 11/16/18, GC RECEIVED A LOW-PRESSURE ALARM OF 0 AT MEASURING STATION (MS) 804927 CORRINE DELIVERY POINT (DP) AT THE END OF LINE KA-14. COMPANY PERSONNEL ARRIVED ONSITE AT 01:45 ON 11/16/2018 AND CONFIRMED A FIRE AT CORRINE REGULATOR STATION (RS) 807629 LOCATED AT PIPELINES KA TO KA-14. COMPANY PERSONNEL CLOSED THE VALVE TO PIPELINE KA-14 AT 02:45 ON 11/16/2018 ISOLATING RS-807629 AND PIPELINE KA-14. COMPANY PERSONNEL CONTACTED MOUNTAINEER GAS COMPANY (LOCAL DISTRIBUTION OPERATOR) TO ISOLATE THE FEED AT MS-804927 CORRINE DP TO PREVENT BACKFEED INTO PIPELINE KA-14. PRELIMINARY INVESTIGATION IDENTIFIED A FAILED 2"" ANSI-600 FLANGED CONNECTION THAT WAS MISSING PART OF THE GARLOCK GASKET. THE MISSING GASKET ALIGNS WITH HEAT MAPS OF THE FACILITY TO INDICATE THE FIRE DAMAGE IS SOURCED FROM THIS FLANGE. IGNITION SOURCE FOR THE LEAK AT THE INLET FLANGE TO THE REGULATION COULD BE THE IN-DIRECT FIRED HEATER ONSITE. TEMPORARY SERVICE WILL BE RESTORED USING A 2"" SKID MOUNTED REGULATION SKID AND 2"" CONNECTION TO AND FROM BELOW GROUND PIPING TO PIPELINE KA-14. PERMANENT INSTALLATION OF FACILITY WILL COMMENCE IN 2019 WITH EXPECTED IN SERVICE OF MARCH 29, 2019. THE INITIAL NRC REPORT NO. 1230533 REPORTED ON NOVEMBER 16, 2016 @ 02:32 AND THE 48-HR UPDATE NRC REPORT NO. 1230594 WAS REPORTED ON NOVEMBER 16, 2018 @ 14:23. AN APPARENT GASKET FAILURE OCCURRED IN TOP WORKS OF THE PRESSURE REGULATOR AT CORRINE REGULATOR STATION (RS) 807629. REPAIRS WERE COMPLETED ON JUNE 10, 2019.