SUNOCO PIPELINE L.P.

Incident Narrative

ON 3/26/2020 AT APPROXIMATELY 12:30 A COMPANY TANK FARM OPERATOR DISCOVERED A TRANSMIX LEAK INTO THE TANK 319 DIKE CONTAINMENT AREA AT THE TANK 319 TRANSMIX TRANSFER PUMP DISCHARGE PRESSURE RELIEF VALVE PIPING. THE OPERATOR ISOLATED THE EQUIPMENT AND MADE NOTIFICATION TO SUPERVISOR. THE SOURCE OF THE TRANSMIX LEAK WAS IDENTIFIED AS A FAILED 3/4 INCH PIPE NIPPLE LOCATED ON 2 INCH DISCHARGE PIPING IMMEDIATELY DOWNSTREAM OF THE DISCHARGE SIDE OF TRANSMIX PUMP P-8104. THE FAILED 3/4 INCH NIPPLE WAS BETWEEN THE 2 INCH PIPING AND THE INLET TO PRV-8105. FIELD INSPECTION OF THE FAILED FITTING DETERMINED THE FAILURE OCCURRED AT THE THREADED AREA OF THE NIPPLE ON THE END CONNECTED TO THE 2 INCH TRANSMIX TRANSFER PIPING. FAILURE WAS ATTRIBUTED TO VIBRATION. THE NIPPLE WAS REPLACED AND THE SYSTEM RETURNED TO SERVICE. FURTHER ANALYSIS DETERMINED THAT THE FAILURE OCCURRED DUE TO THE TRANSMIX TRANSFER PUMP CONTINUING TO RUN AFTER INTENDED SHUTDOWN WHICH FILLED THE HEADER WITH PRODUCT CAUSING THE PUMP TO DEADHEAD AGAINST THAT PRESSURE RESULTING IN THE VIBRATION. ALL PROGRAMMING LOGIC WAS REVIEWED AND NO PROBLEMS WERE DISCOVERED. TO PREVENT RECURRENCE THE TRANSFER PUMP DISCHARGE SHUTDOWN SET POINT WILL BE LOWERED FURTHER WHICH WILL ENHANCE THE SECONDARY PROTECTIVE PROGRAMMING LOGIC IN PLACE CURRENTLY AND PREVENT CONTINUED PUMP OPERATION ONCE THE LOWER SET POINT IS REACHED.