ENERGY TRANSFER COMPANY

Incident Narrative

ON 12/11/2023 AT APPROXIMATELY 10:30, OPERATIONS PERSONNEL WERE PATROLLING THE EAST TEXAS 10-INCH RIGHT-OF-WAY (ROW) NEAR WARREN STATION AND DISCOVERED CRUDE OIL ON THE SURFACE. THE LINE HAD BEEN SHUT DOWN AT APPROXIMATELY 10:00 DUE TO A LINE IMBALANCE INVESTIGATION AND REMOTELY CONTROLLED VALVES HAD BEEN CLOSED TO ISOLATE THE SEGMENT. APPROXIMATELY 47 BBLS OF CRUDE OIL WAS RELEASED. PRODUCT MIGRATED OFF OF THE RESULTING IN APPROXIMATELY 1 BBL IMPACTING HORSE PEN CREEK. OSROS WERE ENGAGED AND WORKED TO REMOVE ALL RELEASED PRODUCT AND IMPACTED SOIL. UPON EXCAVATION THE SOURCE OF THE LEAK WAS DETERMINED TO BE FROM AN UNGROUND FLANGED CONNECTION. THE FAILED PIPELINE SECTION WAS CUTOUT AND REPLACED AND THE LINE WAS RESTARTED ON 12/14/2023. THE CAUSE OF THE FAILURE HAS YET TO BE DETERMINED. A SUPPLEMENTAL REPORT WILL BE SUBMITTED ONCE THE INVESTIGATION IS COMPLETE. SUPPLEMENTAL & FINAL REPORT: THE CAUSE OF THE ACCIDENT WAS DETERMINED TO BE INTERNAL CORROSION AFFECTING THE FLANGED CONNECTION. THE INTERNAL CORROSION OCCURRED WHERE THE FLANGE FACES CONNECTED TOGETHER IN AREA WHICH ALLOWED WATER AND SOLIDS TO DROP OUT OF THE PRODUCT STREAM IN AND WHERE INHIBITOR COULD NOT BE EFFECTIVELY DISTRIBUTED. THE THICKNESS OF THE FLANGE FACES ALSO MAY HAVE MASKED ANY INDICATIONS OF METAL LOSS INDICATED FROM MFL ILI TOOL ASSESSMENTS. TO PREVENT REOCCURRENCE, THE FLANGED CONNECTION WAS CUT OUT AND NEW REPLACEMENT PIPE WAS WELDED IN. ADDITIONALLY, A REVIEW OF ILI DATA IDENTIFIED 11 MORE SETS OF UNDERGROUND FLANGES IN THE SYSTEM. DURING THE REPAIR OF THE FAILED SECTION ANOTHER FLANGED CONNECTION UPSTREAM OF THE FAILURE WAS CUT OUT AND REPLACED. THE REMAINING 10 FLANGED CONNECTION LOCATIONS WERE EXCAVATED AND INSPECTED. AS AN ADDITIONAL PRECAUTIONARY MEASURE, INSPECTION PORTS AT THESE LOCATIONS WERE INSTALLED IN ORDER TO BE ABLE TO MONITOR THESE LOCATIONS FOR INDICATIONS OF A FAILURE. ALL EXISTING CATHODIC PROTECTION BONDS ACROSS ALL REMAINING FLANGED CONNECTIONS WERE INSPECTED AND REPAIRED AS NEEDED TO ENSURE CONTINUITY IN THE EXTERNAL CATHODIC PROTECTION SYSTEM.