ENABLE GAS TRANSMISSION, LLC

Incident Narrative

ON MARCH 9TH, 2021, A THIRD-PARTY CONTRACTOR (HMI UTILITIES) INSTALLING POLY CONDUIT FOR FIBER OPTIC SERVICE WITH A VIBRATORY PLOW TRENCHER STRUCK A 3"" SEGMENT OF ENABLE GAS TRANSMISSION (EGT) LINE 2-H. THE LINE STRIKE TOOK PLACE EAST OF CANTON, OKLAHOMA ALONG THE SOUTH SIDE OF STATE HIGHWAY 51 BETWEEN COUNTY ROADS N2520 AND N2530 IN BLAINE COUNTY. ON THE MORNING OF MARCH 8TH, 2021, AN OKIE ONE CALL TICKET (# 21030308530816V) WAS CLEARED IN KORWEB AT 6:57AM. THE TICKET WAS DUE THAT MORNING AT 7:00AM. THERE ARE NO COMMENTS ON THE COMPLETED TICKET IN KORWEB. ON THE MORNING OF MARCH 9TH, 2021, ENABLE RECEIVED A SCADA LOW-PRESSURE NOTIFICATION FROM THE ENABLE CANTON TOWN BORDER DELIVERY AT 10:05AM. ENABLE OPS PERSONNEL ARRIVED AT THE LINE STRIKE SITE SOMETIME AROUND 10:15AM. AFTER SEEING GAS VENTING FROM THE AREA AROUND THE VIBRATORY PLOW OPERATED BY HMI UTILITIES, IT WAS ASSUMED THE VENTING GAS WAS EGT LINE 2-H. THE LOCAL FIRE DEPARTMENTS AND COUNTY SHERIFFS OFFICES WERE ASKED TO BLOCK OFF STATE HIGHWAY 51 TO PREVENT TRAFFIC FROM PASSING INTO THE VENTING GAS PLUME. THE HIGHWAY REMAINED BLOCKED OFF UNTIL A COMPRESSED NATURAL GAS TRANSPORT TRUCK COULD BE DELIVERED TO THE CANTON TOWN BORDER WHICH WOULD ENSURE SUPPLY TO THE CITY OF CANTON. THE TRANSPORT TRUCK ARRIVED AROUND 4:00PM AND CONNECTED TO THE PIPELINE. THE DAMAGED PIPELINE WAS ISOLATED AND VENTED FLAT AT 5:00PM. THE AREA AROUND THE VIBRATORY PLOW WAS VERIFIED TO BE CLEAR OF ALL VENTING GAS WHEN THE ENABLE CONTRACTOR BEGAN EXCAVATING THE PIPELINE TO CONFIRM DAMAGE. IT WAS FOUND THAT 255 FEET OF LINE WOULD NEED TO BE REPLACED DUE TO DAMAGE FROM THE HMI PLOW. THE LINE STRIKE IS DUE TO THE ENABLE EMPLOYEE INCORRECTLY CLEARING THE OKIE ONE CALL TICKET 21030308530816V IN KORWEB. THE ENABLE EMPLOYEE DID NOT COMMUNICATE WITH HMI UTILITIES TO DETERMINE A SCOPE OF WORK. A CALL WAS PLACED TO THE NRC ON 3/9/2021 (#1299908) AND A 48-HOUR FOLLOW UP WAS PLACED ON 3/11/2021 (#1300071).