"TEXAS EASTERN TRANSMISSION, LP"

Incident Narrative

"ON JULY 15, 2023 AT 10:27 A.M. CST, A THIRD PARTY DISCOVERED BUBBLES IN THE GULF OF MEXICO AND CONTACTED WITT O'BRIEN'S RESPONSE, WITT O'BRIEN SUBSEQUENTLY MADE THE NOTIFICATION TO THE NRC AT 11:29 A.M CST. WITT O'BRIEN'S NOTIFIED ENBRIDGE FIELD PERSONNEL OF THE EVENT AND PROVIDED THE COORDINATES OF THE LEAK. TETLP BEGAN INVESTIGATING THE LEAK AND NOTIFYING PRODUCERS TO SHUT IN PRODUCTION ON THE SYSTEM AT APPROXIMATELY 11:00 A.M ON JULY 15, 2023. TETLP MADE THE INITIAL NOTIFICATION TO THE NRC ON JULY 15, 2023 AT 1:33 P.M.CST UPON CONFIRMED DISCOVERY (BASED ON THE COORDINATES, ASSUMPTION THAT THE LEAK WAS ON TETLP'S LINE 40-B-4 AND ESTIMATED REPAIR COSTS WHICH EXCEEDED THE PHMSA REPORTING THRESHOLD OF AN INCIDENT. AT APPROXIMATELY 2:37 P.M. CST ON MAY 16 TETLP CONFIRMED THAT THE LEAK WAS ON TETLP'S 24 INCH, LINE 40-B-4. TETLP IMMEDIATELY MOBILIZED A LIFT BOAT TO START ISOLATION AND BLOWDOWN. LINE 40-B-4 WAS ISOLATED AND DEPRESSURIZED ON JULY 22, 2023. THE LEAK WAS REPAIRED BY INSTALLING A MECHANICAL COUPLING ON JULY 31, 2023. A LEAK TEST WAS SUCCESSFULLY PERFORMED ON THE MECHANICAL COUPLING AND THE LINE RE-PRESSURIZED AND RETURNED BACK TO SERVICE ON JULY 31, 2023. THE LEAK WAS A PINHOLE LOCATED AT THE 6 O'CLOCK POSITION, THAT WAS CAUSED BY INTERNAL CORROSION. THE ROOT CAUSE IS BELIEVED TO BE DUE TO INTERNAL CORROSION ON THE LOW POINT OF THE LINE."