VALERO PARTNERS OPERATING CO. LLC

Incident Narrative

TANK 1958 ROOF LISTED DURING AN UNUSUALLY HEAVY RAIN BROUGHT ON BY TROPICAL STORM IMELDA 2019. CRUDE OIL SURFACE ONTO THE TOP OF THE TANK ROOF THROUGH THE TANK ROOF SEALS.THE TANK ROOF REALIGNED AS THE RAINWATER AND CRUDE OIL RELEASED THROUGH THE OPEN RAINWATER ROOF DRAINS. THE CRUDE OIL AND RAINWATER WAS CONTAINED INSIDE VALERO'S TANK BERM. CRUDE OIL WAS RECOVERED BACK INTO THE TANK AND CONTAMINATED SOIL WILL BE DISPOSED IN ACCORDANCE WITH STATE AND FEDERAL REGULATIONS. THE TANK WAS STATIC DURING THE RAIN STORM. VALERO INITIATED AN INCIDENT INVESTIGATION. AFTER THE CRUDE OIL WAS RECOVERED THE TANK WAS INSPECTED FOR INTEGRITY. NO INTEGRITY ISSUES WERE FOUND DURING THE INSPECTION. VALERO'S INCIDENT INVESTIGATION IS CURRENTLY ONGOING. TANK 1958 HAS AN EXTERNAL FLOATING ROOF WITH DUAL ARTICULATED TYPE ROOF DRAINS WITH PIVOT MASTER JOINTS. VALERO HAS TAKEN THIS TANK OUT OF SERVICE ON NOVEMBER 6, 2019 TO ASSESS THE INTEGRITY OF THE ROOF DRAINS. ON DECEMBER 5, 2019, VALERO COMPLETED THE INTERNAL CLEANING OF THE TANK TO ASSESS THE INTERNAL ROOF DRAINS AND REPLACE ALL JOINTS WITH NEW PIVOT MASTERS. UPON VISUAL INSPECTION OF THE ROOF DRAIN LINES, IT WAS DETERMINED THAT ONE OF THE SUPPORT CHAINS ON THE NORTH DRAIN LINE CONNECTING THE ARTICULATING JOINTS WAS COMPROMISED. ALL PIVOT MATER JOINTS WILL BE REMOVED AND SENT TO A THIRD PARTY FOR A PRESSURE TEST AND INTEGRITY ASSESSMENT. THE INCIDENT INVESTIGATION WILL REMAIN OPEN UNTIL ALL INSPECTION DATA OF THE ROOF DRAINS IS COMPLETE. 1/24/2020 CAUSE WAS DETERMINED THE SUPPORT CHAIN ON THE NORTH DRAIN LINE CONNECTING THE ARTICULATING JOINT WAS COMPROMISED. A SPLIT LINK CONNECTOR SPREAD APART AND DETACHED. REPAIRED THE ROOF DRAIN CHAIN ON THE ARTICULATING JOINT BY WELDING THE SPLIT LINK.