ENTERPRISE PRODUCTS OPERATING LLC

Incident Narrative

ON FEB. 2, 2016, AT APPROXIMATELY 1315 EST, AN OPERATOR WAS DELIVERING GASOLINE INTO TANKAGE FROM THE 10-INCH P45 PIPELINE. WHEN ATTEMPTING TO SWITCH THE FLOW INTO A SECOND TANK, THE OPERATOR DIRECTED FLOW AGAINST A CLOSED VALVE. AT THIS TIME, GASOLINE WAS OBSERVED POOLING NEAR THE SECOND TANK AND A BELOW-GRADE MANIFOLD. FLOW TO THE TERMINAL WAS SHUT DOWN AND PRESSURE WITHIN THE FACILITY RELIEVED BY OPENING THE VALVE AT THE SECOND TANK AND ALLOWING FLOW INTO THE TANK. 69 BARRELS OF GASOLINE WERE RELEASED DURING THE EVENT. ALL RELEASED PRODUCT REMAINED WITHIN THE GROUNDS OF THE FACILITY AND NO WATER WAS IMPACTED. NO INJURIES OR FIRES OCCURRED. NRC NOTIFICATION WAS MADE UPON DETERMINING THE EXTENT OF THE SPILLED PRODUCT AND LIKELIHOOD OF REMEDIATION AND REPAIR COSTS EXCEEDING $50,000. DURING INVESTIGATION OF THE INCIDENT, IT WAS DETERMINED THAT THE MANIFOLD AND TANK PIPING WERE SUBJECT TO AN OVER PRESSURE REACHING 805 PSIG WITH AN MOP OF 275 PSIG. THE RELEASE WAS DETERMINED TO ORIGINATE AT A 20-INCH BELOW-GRADE FLANGE, AND ALSO AT THE FLANGED CONNECTION AT THE TANK VALVE ON THE SECOND TANK. ENTERPRISE'S RESPONSE TO THE OVERPRESSURE AND RELEASE INCLUDES THE FOLLOWING ACTIONS: - SHUT IN ALL AFFECTED PIPING - REMOVE ALL FREE PRODUCT AND REMEDIATE IMPACTED SOIL - EXCAVATE BELOW-GRADE FLANGES FOR INSPECTION AND REPAIR - REPLACE ALL BOLTS AND GASKETS ON ALL FLANGED CONNECTIONS EXPOSED TO THE OVERPRESSURE - HYDROTEST IMPACTED PIPING - INSTALL A NEW FULL-FLOW RELIEF SYSTEM IN THE AFFECTED PIPING TO AVOID RECURRENCE