MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

AT 20:52 ON MARCH 21ST, 2021, MAGELLAN OPERATIONS CONTROL INITIATED A STOP COMMAND FOR THE HENRIETTA UNIT. THE UNIT CONTINUED TO SHOW A RUN STATUS AND A MAGELLAN TECHNICIAN WAS IMMEDIATELY DISPATCHED TO TROUBLESHOOT THE ISSUE. AT 21:52, OPERATIONS CONTROL RECEIVED A CALL FROM A 3RD PARTY REPORTING A FIRE AT THE HENRIETTA PUMP STATION. A CODE RED EVENT WAS INITIATED AND THE HENRIETTA FIRE DEPARTMENT ARRIVED ONSITE AND EXTINGUISHED THE FIRE. A DE MINIMUS VOLUME OF PRODUCT WAS RELEASED AND THERE WERE NO INDICATIONS THAT PRODUCT REACHED THE GROUND. AN INCIDENT INVESTIGATION WAS PERFORMED AND DETERMINED THE CAUSE OF THE FAILURE TO BE A FAILURE WITH THE RUN RELAY. THE RUN STATUS IN THE PLC WAS A REFLECTION OF THE RUN CONTROL OUTPUT STATUS. A STOP COMMAND FROM THE CONTROLLER CAUSED THE RUN RELAY OUTPUT TO DROP OUT, HOWEVER, THE RUN RELAY FAILED AND WELDED IN THE CLOSED POSITION. THIS CAUSED THE MOTOR STARTER TO NOT RESPOND TO THE STOP COMMAND FROM THE PLC SYSTEM. THE SUCTION AND DISCHARGE VALVES ON THE UNIT CLOSED AS EXPECTED DURING THE SHUTDOWN SEQUENCE. THE UNIT CONTINUED TO OPERATE AGAINST THE CLOSED VALVES, INCREASING THE TEMPERATURE OF THE PRODUCT, WHICH ULTIMATELY CAUSED THE INBOARD MECHANICAL SEAL TO FAIL. TO PREVENT FUTURE OCCURRENCE, THE RUN AND STOP RELAY OUTPUTS FROM THE MAINLINE STARTER WILL BE SEPARATED. ADDITIONALLY, EMERGENCY SHUTDOWN RELAYS WILL BE INSTALLED AND WIRED DIRECTLY INTO THE CIRCUIT BREAKER FEEDING THE MOTOR STARTER FOR ALL ACTIVE STATIONS ON THE ORION PIPELINE SYSTEM. A PROCESS WILL ALSO BE DEVELOPED TO EVALUATE THE CONTROLS SYSTEM ARCHITECTURE FOR ALL ASSETS OWNED BY THE PREVIOUS OPERATOR. SUPPLEMENTAL/FINAL (09-20-2021) PART G, H