CENTURION PIPELINE L.P.

Incident Narrative

ON SEPTEMBER 17, 2018, AT APPROXIMATELY 3:10 PM, A CENTURION PIPELINE L.P. (CPL) EMPLOYEE IDENTIFIED A LEAK AT SLAUGHTER STATION NEAR LEVELLAND, TEXAS, IN HOCKLEY COUNTY, TEXAS. CPL IMMEDIATELY SHUT DOWN THE STATION AND SECURED THE RELEASE. AFTER EXCAVATION, CPL DETERMINED THE SOURCE OF CRUDE OIL TO BE THE 12'' DISCHARGE LINE OF BOOSTER PUMP #1. CPL INSTALLED A PLIDCO SPLIT + SLEEVE, A COMMERCIALLY AVAILABLE BOLT ON SPLIT SLEEVE REPAIR, AND RESTARTED THE STATION AT 5:35 PM ON SEPTEMBER 18, 2018. APPROXIMATELY 15 BARRELS OF CRUDE OIL WERE RELEASED WITHIN THE CPL-CONTROLLED STATION, AND 13 BARRELS WERE RECOVERED. NO INJURIES, FATALITIES, OR FIRES WERE ASSOCIATED WITH THIS ACCIDENT. AT THE TIME OF THIS SUBMITTAL, THE ROOT CAUSE ANALYSIS OF THE FAILURE HAS NOT YET BEEN COMPLETED. FOR THE PURPOSES OF SUBMITTING THIS ORIGINAL ACCIDENT REPORT, CPL SELECTED ""CORROSION FAILURE"" AND A SUB-CAUSE OF ""INTERNAL CORROSION."" HOWEVER, CPL WILL REMOVE THE FAILED SECTION OF PIPE FOR FURTHER ANALYSIS AND WILL SUBMIT A SUPPLEMENTAL REPORT CONTAINING THE RESULTS OF THE FAILURE INVESTIGATION ONCE COMPLETED. THE SUPPLEMENTAL REPORT WILL ALSO CONTAIN THE AMOUNT OF OIL RECOVERED DURING CONTINUED REMEDIATION, THE REMAINING COST ACCRUALS ASSOCIATED WITH THIS ACCIDENT, AND ANY NECESSARY PREVENTATIVE MAINTENANCE MEASURES. SUPPLEMENTAL FINAL REPORT FILED ON APRIL 23, 2019: THE FOLLOWING UPDATES ARE INCLUDED IN THIS SUPPLEMENTAL/FINAL REPORT: 1. THE VOLUME OF THE COMMODITY RECOVERED IN QUESTION A11 IS UPDATED TO REFLECT THE COMPLETED REMEDIATION EFFORTS. ALL PRODUCT HAS BEEN RECOVERED FROM THE ENVIRONMENT. 2. DURING THE ROOT CAUSE ANALYSIS, CPL DETERMINED THAT THE CAUSE OF FAILURE IS INTERNAL CORROSION. QUESTION C6 IS UPDATED TO DESCRIBE THE TYPE OF ACCIDENT AS A LEAK DUE TO A THROUGH-WALL PIT DUE TO MICROBIOLOGICALLY INDUCED CORROSION (MIC). 3. THE REMAINING COST ACCRUALS AND ADJUSTMENTS ARE ACCOUNTED FOR IN QUESTION D8. 4. CPL IDENTIFIED PITTING DURING THE INTERNAL PIPE INSPECTION AND DETERMINED THE PIT MORPHOLOGY INDICATES THE PRESENCE OF MIC. QUESTION G1-6 IS UPDATED TO REFLECT THE IDENTIFICATION OF LOCALIZED PITTING, AND G1-7 IS UPDATED TO INCLUDE MICROBIOLOGICAL AS THE TYPE OF CORROSION RELATED TO THIS ACCIDENT. DURING THE INVESTIGATION, CPL DETERMINED THAT MIC WAS CAUSED BY NOT PURGING THE DISCHARGE LINE WHILE THE BOOSTER PUMP WAS NOT IN OPERATION FOR AN EXTENDED PERIOD OF TIME. IN ORDER TO PREVENT SIMILAR ACCIDENTS FROM OCCURRING, CPL WILL FLUSH THE BOOSTER PUMP DISCHARGE LINE BY ALTERNATING OPERATION BETWEEN REDUNDANT PUMPS ON A QUARTERLY BASIS. ALL REPAIRS AND REMEDIATION RELATED TO THIS ACCIDENT ARE COMPLETE. 5. NRC REPORT NUMBER 1225104 CORRESPONDS TO THE 48 HOUR UPDATE REPORT.