FLINT HILLS RESOURCES, LC

Incident Narrative

UPDATED SECTION G, QUESTIONS 7 & 8 OF THE INTERNAL CORROSION SECTION AND ALSO INCLUDED A SUMMARY OF THE LABORATORY RESULTS BELOW. ON 04/21/2019 AT APPROXIMATELY 7:43 AM, FHR OPERATIONS PERSONNEL DISCOVERED A CRUDE OIL RELEASE AT HELENA TERMINAL. AT APPROXIMATELY 7:45 AM, THE SOURCE OF THE LEAK WAS VERIFIED AND THE PIPELINE CONTROL CENTER WAS CONTACTED TO SHUT DOWN THE OUTBOUND HELENA TO PETTUS 16"", INDEX #60501020. THE PCC BLOCKED IN THE STATION TANK VALVE AND THE INCOMING TRAP VALVE AT PETTUS STATION AT 7:51 AM. FHR PERSONNEL INITIATED AIR MONITORING, NO LEL OR H2S LEVELS WERE FOUND. THE PCC OPENED THE LINE INTO PETTUS TANK TO ALLOW THE LINE TO DE-PRESSURIZE. AT APPROXIMATELY 8:16 AM, FHR PERSONNEL DEPLOYED BOOM IN THE AREA TO KEEP PRODUCT ONSITE. AT APPROXIMATELY 8:44 AM, THE NRC (#1243321) AND TEXAS RAILROAD COMMISSION OFFICE OF PIPELINE SAFETY WERE NOTIFIED. THE IMPACTED PIPE SECTION WAS CUT OUT AND REPLACED THE MORNING OF 04/22/2019 AND PIPE WAS SENT TO DNV LAB FOR ANALYSIS. THE DNV IMMEDIATE CAUSE ANALYSIS REPORT INDICATES THAT THE LEAK OCCURRED DUE TO INTERNAL CORROSION THAT PROPAGATED THROUGH-WALL AT THE 6:00 ORIENTATION. THE LEAK WAS ASSOCIATED WITH A DISCRETE PIT AND WAS LOCATED WITHIN AN AREA OF ACCUMULATED SOLIDS. THE SYSTEM WAS STARTED BACK UP AT 6:45 PM ON 04/22/2019. CLEAN UP WAS COMPLETED AT HELENA STATION ON 04/25/2019.