MAGELLAN PIPELINES HOLDINGS, LP

Incident Narrative

AN INSPECTOR OVERSEEING NEW CONSTRUCTION AT PAULS VALLEY STATION OBSERVED PRODUCT ON THE GROUND AT THE LOCATION OF A NEWLY INSTALLED PUMP. LOCAL OPERATIONS PERSONNEL WERE NOTIFIED TO INVESTIGATE, AND OPERATIONS CONTROL WAS NOTIFIED TO INITIATE SHUTDOWN PROCEDURES. VALVES WERE CLOSED TO ISOLATE THE LEAK AND CLEANUP ACTIVITIES COMMENCED. VAC TRUCKS WERE USED TO COLLECT FREE PRODUCT AND CONTAMINATED SOIL WAS REMOVED AND CONTAINERIZED FOR PROPER DISPOSAL. PRIOR TO THE RELEASE, A BLIND FLANGE WAS INSTALLED ON A GATE VALVE LOCATED UPSTREAM OF THE PROPOSED PUMP SUCTION PIPING. THE SUCTION AND DISCHARGE PIPING HAD NOT BEEN INSTALLED YET PENDING THE ARRIVAL OF THE NEW PUMP. ON 2/18/2019, THE NEW PUMP WAS DELIVERED. THE BLIND FLANGE WAS REMOVED, THE GATE VALVE WAS CLOSED, AND INSTALLATION OF THE PUMP, SUCTION PIPING, AND DISCHARGE PIPING COMMENCED. MISALIGNMENT WAS OBSERVED BETWEEN THE PUMP AND THE SUCTION AND DISCHARGE PIPING AND AS A RESULT, THE SUCTION AND DISCHARGE FLANGES WERE INCOMPLETELY TORQUED TO PREVENT PIPE STRAIN. PROPER TORQUEING WOULD OCCUR LATER AFTER THE MISALIGNMENT WAS CORRECTED. THE GATE VALVE WAS LEFT IN THE CLOSED POSITION TO SEPARATE THE ACTIVE ASSETS FROM THE UNDER-CONSTRUCTION ASSETS. ON 2/28/2019, A PRODUCT MOVEMENT WAS MADE FROM A TANK THROUGH AN EXISTING PUMP. THIS MOVEMENT PRESSURED UP THE SECTION OF PIPING ON THE ACTIVE SIDE OF THE GATE VALVE. COLD TEMPERATURES ALONG WITH WATER ACCUMULATION IN THE GATE VALVE RESULTED IN ICE FORMATION IN THE VALVE BODY WHICH ALLOWED PRODUCT TO BYPASS THE VALVE INTO THE UNDER-CONSTRUCTION ASSETS. PRODUCT RELEASE WAS OBSERVED AT THE PUMP'S SUCTION AND DISCHARGE FLANGES. FUTURE PREVENTATIVE ACTIONS INCLUDE ENSURING LOCKOUT/TAGOUT PROCEDURES ARE FOLLOWED, INSTALLING ADDITIONAL ISOLATION BARRIERS TO SEPARATE ACTIVE ASSETS FROM UNDER-CONSTRUCTION ASSETS, ENSURING NEW ASSETS ARE PROPERLY DEWATERED FOLLOWING HYDROTESTING AND PERFORMING WINTERIZATION TASKS.