PLANTATION PIPE LINE CO

Incident Narrative

ON AUGUST 11, 2019 AT APPROXIMATELY 07:24, THE PLANTATION CONTROL CENTER RECEIVED AN EXPLOSIVE ATMOSPHERE DETECTOR (EAD) ALARM FOR THE COLLINS TANK FARM EAST MANIFOLD AREA. THE CONTROL CENTER CONTACTED THE LOCAL COLLINS O&M PERSONNEL ON SHIFT SO THEY COULD INVESTIGATE THE ALARM. THE O&M PERSONNEL WENT TO THE EAST MANIFOLD AREA AND NOTICED PRODUCT COMING FROM THE ROOFTOP OF TANK RT-2. THE O&M CONTACTED THE CONTROL CENTER TO BEGIN A SHUTDOWN OF ALL PIPELINES FOR THE AFFECTING THE EAST MANIFOLD. THE SHUTDOWN OF THE PIPELINES WERE INITIATED AT 07:26. UPON FURTHER INVESTIGATION OF THE EAST MANIFOLD AREA, THE O&M PERSONNEL NOTICED A TANK LINE RISER VALVE OPEN FOR TANK 161. HE IMMEDIATELY CLOSED THE VALVE. TANK RT-2 OVERFLOWED, RELEASING APPROXIMATELY 27.3 BBLS OF TRANSMIX. AFTER ADDITIONAL ASSESSMENT OF THE RELEASE SITE, IT WAS DETERMINED THIS INCIDENT MIGHT EXCEED THE $50,000 NATIONAL RESPONSE CENTER (NRC) REPORTING CRITERIA. THE NRC WAS PROMPTLY NOTIFIED AFTER THIS ASSESSMENT. THE SOURCE OF THE PRODUCT CAUSING THE OVERFILLING OF TANK RT-2 WAS AN OPEN SAMPLE VALVE ON THE PIPING HEADER OF TANK 161 IN THE FACILITY'S EAST MANIFOLD AREA. PRODUCT FROM THE TANK HEADER FLOWED INTO A CLOSED DRAIN SYSTEM, ACCUMULATED IN A SUMP TANK AND WAS THEN PUMPED BY AN AUTOMATED SUMP PUMP INTO TANK RT-2. THE TANK HIGH-LEVEL ALARM FAILED WHICH ALLOWED THE TANK TO OVERFILL.