ENBRIDGE STORAGE (CUSHING) L.L.C.

Incident Narrative

ON MARCH 7, 2022 AT APPROXIMATELY 9:00 AM CST, WHILE DOING SITE DRAINAGE AFTER A RAIN EVENT, FIELD TECHNICIANS DISCOVERED APPROXIMATELY ONE BARREL OF CRUDE OIL ON THE ROOF OF TANK 2522 AT GRANDSTAFF TERMINAL. ALL CRUDE OIL WAS CONTAINED ON THE ROOF. A VAC TRUCK WAS BROUGHT TO THE SITE TO DRAIN THE ROOF BUT AFTER PULLING FLUID FROM THE TANK THE LEVEL ON THE ROOF WAS NOT AFFECTED. THE SUSPECTED CAUSE OF THIS ISSUE IS A FAILURE IN THE ROOF DRAIN LINE. CREWS WERE MOBILIZED TO THE SITE TO SAFELY ENTER THE TANK ROOF TO PLUG THE DRAIN LINE AND PUMP THE CRUDE OIL/WATER MIXTURE OFF THE ROOF. AT THE TIME OF THE RELEASE, TANK 2522 WAS SCHEDULED TO GO OUT-OF-SERVICE. THE TANK WAS DRAINED AND DISCONNECTED FROM OUR PIPING TO BEGIN THE OUT-OF-SERVICE INSPECTION. DURING THE INSPECTION IT WAS DISCOVERED THAT THE GASKETS ON THE ROOF DRAIN SYSTEM HAD FAILED DURING NORMAL OPERATIONS. LARGE SECTIONS OF THE FIBER GASKETS WERE NO LONGER INSIDE OF THE FLANGE FACES. DURING THE INVESTIGATION, IT WAS DETERMINED THAT THE ROOF DRAIN SYSTEM WAS NOT AT INDUSTRY STANDARD. THE OWNER OF TANK 2522 (TRANSMONTAIGNE) WILL UPDATE THE ROOF DRAIN SYSTEM TO INDUSTRY STANDARD PRIOR TO IT RETURNING TO SERVICE UNDER ENBRIDGE OPERATIONS.