PLAINS PIPELINE, L.P.

Incident Narrative

APPROXIMATELY 95 BARRELS WERE RELEASED WITHIN SECONDARY CONTAINMENT AS A RESULT OF INTERNAL CORROSION ON TANK LINE 1418. A PINHOLE LEAK WAS DISCOVERED AT THE 6 O'CLOCK POSITION AND WAS REPAIRED WITH A CLAMP. NOTIFICATION TO THE NRC WAS MADE AS A RESULT OF COSTS EXCEEDING 50K ON 03/21/2019. INITIAL NRC REPORT #1240642; 48-HOUR FOLLOW UP NRC REPORT #1240829. BASED ON THE SIZE OF THE LEAK, THE EARLIEST TIME THE RELEASE COULD HAVE STARTED WAS CALCULATED TO BE 3:37 ON 03/17/2019. THE LINE AND TANK HAVE BEEN SHUT DOWN AND ISOLATED, AND PLAINS IS CONDUCTING NDT ASSESSMENTS AT THE FAILURE LOCATION. SUPPLEMENTAL NARRATIVE: THE RESULTS OF THE FAILURE ANALYSIS INDICATE THAT THE LEAK OCCURRED DUE TO INTERNAL CORROSION THAT PROPAGATED THROUGH-WALL ALONG THE 5:38 O'CLOCK ORIENTATION. THE LEAK WAS ASSOCIATED WITH A DISCRETE PIT AND WAS LOCATED WITHIN AN AREA OF ACCUMULATED SOLIDS. THE CORROSION LIKELY OCCURRED WITHIN THE PIPE DURING PERIODS OF STAGNATION AND MICROORGANISMS LIKELY PLAYED THE PRIMARY ROLE IN THE CORROSION MECHANISM. THE TANK LINE 1418 WAS REPLACED AND CONSTRUCTED ABOVE GRADE AS OF SEPTEMBER 2019. THIS WILL AID IN THE INSPECTION PROCESS.