COLUMBIA GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2018-11-16

Gas transmission and gathering incident in CORRINE, WYOMING County, WV. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3920 NATURAL GAS released, $525,715 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20180130.

Operator ID: 2616.

Reported incident date: 11/16/2018 2:16.

Location detail: RS-807629

Cause detail: NON-THREADED CONNECTION FAILURE

Cause detail: 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.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — NON-THREADED CONNECTION FAILURE.

PHMSA indexed costs: $539,490 reported total cost, $262,988.047 in 1984 dollars, $634,311.429 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.