CENTURION PIPELINE L.P.

Incident Narrative

ON NOVEMBER 23, 2020, AT APPROXIMATELY 12:40 CST, A CENTURION PIPELINE L.P. (CPL) EMPLOYEE DISCOVERED A LEAK IN CPL'S MIDLAND STATION NEAR MIDLAND, TEXAS IN MIDLAND COUNTY, TEXAS. CPL DETERMINED THE SOURCE OF THE LEAK TO BE STATION PIPING AND PROMPTLY ISOLATED THE LEAK. HOWEVER, ONE (1) BARREL OF CRUDE OIL WAS RELEASED. THE CONTAMINATED SOIL WAS REMEDIATED ON SITE. NO INJURIES, FATALITIES, OR FIRES WERE ASSOCIATED WITH THIS INCIDENT. CPL REPORTED THE LEAK TO THE TEXAS RAILROAD COMMISSION, OFFICE OF PIPELINE SAFETY AT 1320 CST ON NOVEMBER 23, 2020, AND WAS ISSUED INCIDENT NUMBER 2297 IN REFERENCE TO THE INCIDENT. AT THE TIME OF THIS WRITING, THE REPAIR OF THE STATION PIPING IS SCHEDULED AND THE ROOT CAUSE FAILURE ANALYSIS WILL BE CONDUCTED PENDING THE REMOVAL OF THE DAMAGED PIPING SEGMENT. THE RESULTING INFORMATION RELATED TO THE CAUSE OF THE LEAK, PREVENTATIVE AND MITIGATIVE MEASURES (P&M), AND COSTS ASSOCIATED WITH REPAIRING THE STATION PIPING WILL BE SUBMITTED VIA SUPPLEMENTAL REPORT(S). SUPPLEMENTAL FILED ON 03/10/2021: UPDATES INCLUDE PART A-14B; PART C-6; PART D-8C, 8D, 8E AND 8G; PART E-5F AND 7; AND PART G. DURING THE ROOT CAUSE FAILURE ANALYSIS, CPL DETERMINED UNDER-DEPOSIT CORROSION CAUSED THE FAILURE, WHICH RESULTED FROM MULTIPLE CONTRIBUTING FACTORS. PREVIOUSLY STAGNANT CONDITIONS CAUSED WATER AND SOLIDS TO DEPOSIT NEAR A GIRTH WELD ON THE BOTTOM OF A LOW POINT IN THE STATION PIPING, AND A CORROSION CELL FORMED. THE CORROSION RATE INCREASED DUE TO A GALVANIC COUPLE BETWEEN THE IRON SULFIDE DEPOSIT AND THE STEEL PIPE, WHICH WAS FURTHER EXACERBATED BY A GALVANIC COUPLE BETWEEN TWO DIFFERENT AGES OF PIPE. THE COMBINATION OF THE IRON SULFIDE DEPOSIT AND A PARAFFIN DEPOSIT PREVENTED THE CORROSION MITIGATION CHEMICALS FROM REACHING THE STEEL SURFACE AND REDUCED THEIR EFFECTIVENESS. CPL REPLACED THE ENTIRE SEGMENT CONTAINING THE LOW POINT AND REMOVED THE TWO DIFFERENT AGES OF PIPE. ADDITIONALLY, CPL WILL FLUSH AND TREAT THE NEW SEGMENT OF PIPING WITH CORROSION MITIGATION CHEMICALS IF A PERIOD OF NO FLOW EXISTS LONGER THAN 90 DAYS. CPL BELIEVES ELIMINATING THE CONTRIBUTING FACTORS WILL PREVENT SIMILAR ACCIDENTS FROM OCCURRING.