ENTERPRISE PRODUCTS OPERATING LLC

Incident Narrative

ON TUESDAY FEBRUARY 18, 2014 AT APPROXIMATELY 07:56 AM CST, AN ENTERPRISE TECHNICIAN DISCOVERED PROPANE VAPORS LEAKING FROM A VALVE FLANGE LOCATED INSIDE THE IOWA CITY STATION ON AN 8"" HAZARDOUS LIQUID TRANSMISSION LINE. THIS LINE IS APPROXIMATELY 3 MILES IN LENGTH. UPON CONFIRMED DISCOVERY OF THE LEAK, THE OPERATIONS SUPERVISOR TOOK IMMEDIATE ACTION TO ISOLATE THE LINE AND ESTABLISHED A SAFE PERIMETER. APPROXIMATELY 237.5 BBLS OF PRODUCT WAS FLARED UNTIL THE NITROGEN CONTRACTOR WAS AVAILABLE AND ONSITE TO DISPLACE THE REMAINING LINE SEGMENT. THE REMAINING PROPANE WAS DISPLACED THROUGH THE USE OF A PIG WITH NITROGEN. ON WEDNESDAY FEBRUARY 19 AT APPROXIMATELY 04:00 PM, THE GASKET WAS REPLACED AND REPAIRS WERE COMPLETED. AT 04:18 PM, THE NITROGEN WAS DISPLACED AND PRODUCT WAS RE-INTRODUCED INTO THE PIPELINE. INVESTIGATION OF THE LEAK SOURCE CONCLUDED THAT FROST HEAVE STRESSED THE FLANGE MATING AND GASKET MATERIAL THUS CREATING A GAP AND PRODUCING A LEAK SOURCE WITHOUT AN ACTUAL FAILURE OF A COMPONENT. NOTE: IT WAS ASSUMED IN THE WORST CASE SCENARIO, THE LEAK OCCURRED JUST AFTER THE LAST VISUAL INSPECTION ON MONDAY FEBRUARY 17, 2014 AT APPROXIMATELY 08:00 AM. BASED ON THIS ASSUMPTION IT WAS ESTIMATED THE LEAK MET REPORTING CRITERIA AT 09:15 AM ON 2/17/2014 AND A TOTAL OF 2.5 BARRELS OF PROPANE WAS UNINTENTIONALLY RELEASED.