MOBIL CORP

Incident Narrative

ON 10/3/11, THE TORRANCE REFINERY EXPERIENCED A PINHOLE LEAK NEAR THE TORRANCE METER STATION FOR THE 8"" TRUCK UNLOAD RELIEF PIPELINE. THE LEAK RESULTED IN A 41 BBL LOSS OF PRIMARY CONTAINMENT OF WHICH ALL WAS CONTAINED WITHIN THE CONFINES AND PROPERTY OF THE EXXONMOBIL REFINERY. THIS IS A RELIEF PIPELINE THAT PROTECTS EXXONMOBIL PIPELINE COMPANY COMMODITY PIPELINES WHICH ARE UPSTREAM FROM THE TORRANCE METER STATION. THIS SECTION OF RELIEF PIPING RUNS FROM THE METER STATION TO THE 2 DESIGNATED BREAKOUT TANKS INSIDE THE REFINERY. AS A RESULT OF THE LEAK, THE RELIEF PIPING AND EXXONMOBIL PIPELINE COMMODITY PIPELINES WERE IMMEDIATELY TAKEN OUT OF SERVICE. THERE WAS NOT A PRESSURE SURGE INCIDENT, BUT RATHER, A PINHOLE LEAK HAD DEVELOPED ON THE EXTERNAL RELIEF PIPING THAT RESULTED IN A LOSS OF CONTAINMENT. NOTE: THE CA STATE FIRE MARSHAL'S OFFICE OF PIPELINE SAFETY IS AWARE OF THIS INCIDENT AND A CSFM REPRESENTATIVE VISITED THE SITE TO REVIEW POST INCIDENT, AND REVIEWED THE REQUIRED HYDROTESTING THAT WAS CONDUCTED AS PART OF RECOMMISSIONING OF THE RELIEF PIPELINE. PART E5F UPDATE WAS MADE 1/21/14 BY THAD MASSENGALE, EXXONMOBIL PIPELINE CO.