ENERGY TRANSFER COMPANY

Incident Narrative

ON APRIL 17TH 2024, AT APPROXIMATELY 12:00 ENERGY TRANSFER RECEIVED A NOTIFICATION FROM THE PRODUCER SM ENERGY, OF A POSSIBLE LEAK IN THE AREA. ET PERSONNEL PROCEEDED WITH ISOLATING THE LINE AND AT 14:03 THE VALVES WERE LOCKED OUT. AT APPROXIMATELY 14:45, ENERGY TRANSFER PERSONNEL CONFIRMED A LEAK ON THE SME L11 12-INCH PIPELINE (28.122918, -99.967259) AND PROCEEDED WITH BLOWING DOWN THE LINE. THIS IS A 12-INCH TYPE C GAS GATHERING LINE IN A RURAL AREA LOCATED IN WEBB COUNTY NEAR LAREDO, TX AN ESTIMATED 22 MCF OF UNINTENTIONAL GAS WAS RELEASED. IT WAS DETERMINED UPON CONFIRMED DISCOVERY THAT THIS INCIDENT WOULD BE REPORTABLE DUE TO THE ESTIMATE OF PROPERTY DAMAGE AND REPAIR COST. THIS INCIDENT WAS REPORTED TO THE NRC ON APRIL 17TH 2024, AT 2:57PM THE LINE WAS EXCAVATED AND A COUPON (36-INCHES LONG: 0.250-INCH WT) WAS SENT INTO ADV INTEGRITY FOR 3RD PARTY ANALYSIS. FAILURE WAS FOUND TO BE AT THE 6 OCLOCK POSITION; PIT WAS MEASURED TO BE 0.5 INCHES IN DIAMETER. SEDIMENT WAS FOUND, REMOVED, AND ANALYZED AT THE 6 OCLOCK POSITION OF THE PIPE. THE FINDINGS SHOWED THE SEDIMENT HAD PRESENCE OF SIDERITE. AFTER REVIEWING OPERATIONAL AND HISTORICAL RECORDS ALONG WITH A LAB ANALYSIS WE HAVE CONCLUDED THAT THE COMBINATION OF SIDERITE, SAND, IRON SULFIDE, AND OTHER DEBRIS LED TO UNDER DEPOSIT CORROSION AND TO AN EVENTUAL FAILURE. OUR EFFORTS TO MITIGATE THIS ISSUE IS TO MODIFY OUR MAINTENANCE PLAN BY INCORPORATING CHEMICAL TREATMENT FOR IRON SULFIDE AND SOLID DEPOSITS ALONG WITH OUR ROUTINE MAINTENANCE AND PIGGING