ENABLE GAS TRANSMISSION, LLC

Incident Narrative

A LEAK ON BT-14 NEAR LAKE DARDANELLE WAS REPORTED BY THE PUBLIC ON 4/10/2022. OPERATION PERSONNEL ARRIVED ON SITE AND COMPLETED A VISUAL INSPECTION ON BT-14 NEAR THE SHORELINE OF SHOAL BAY (LAKE DARDANELLE). OPERATING PRESSURE WAS REDUCED FROM 700 TO 315 PSIG AND THE LEAK WAS MONITORED VIA DAILY PATROLS FOR TWO WEEKS UNTIL WEATHER PERMITTED ACCESS TO THE PIPE TO EVALUATE THE CAUSE OF THE LEAK. THE SECTION OF PIPE CONTAINING THE LEAK WAS ISOLATED ON 4/22/2022. THE LEAK APPEARED TO BE THE RESULT OF A PINHOLE AT A ""WELD PLUS FITTING'. ON 4/23/2022 AT 12:59 IT WAS DETERMINED THAT THE COST OF REPAIR WOULD EXCEED $122,000....AN INCIDENT NOTIFICATION WAS SENT TO THE NRC AT 1:14PM CENTRAL TIME (NRC# 1334249). A 48HR FOLLOW UP WAS PROVIDED (NRC# 1334340) ON 4/25/2022. THE SECTION OF PIPE WAS BLOWN FLAT AT APPROXIMATELY 3:00PM ON 4/23/2022. THE ""WELD PLUS FITTING"" WAS SENT TO A LAB TO DETERMINE THE EXACT CAUSE AND LOCATION OF THE LEAK; RESULTS FROM THE LAB ARE PENDING. A 115' REPLACEMENT WAS COMPLETED AND THE PIPELINE WAS RETURNED TO SERVICE ON 5-7-2022 AT 10AM. A SUPPLEMENTAL REPORT WILL BE FILED ONCE RESULTS FROM THE LAB HAVE BEEN RECEIVED. SUPPLEMENTAL REPORT 12/7/2022: UPDATED PART G AND PART H WITH THE INFORMATION BELOW: LAB ANALYSIS IDENTIFIED THE LEAK AT THE DOWNSTREAM END OF THE WELD+ENDS COUPLER COINCIDING WITH THE CLAMP SCREW OVER PASS. THE LEAK COINCIDED WITH AN AREA OF UNDERCUT THAT CONNECTED TO THE FEMALE PORTION OF THE CLAMP SCREW ASSEMBLY THROUGH A TIGHT CRACK PATH.