Atmospheric Distillation Tower Repair

• Description of the Damage: Uniform and localized thickness loss, pitting and cracks in several areas on the top of the tower.
• Damage Mechanism: HCI Corrosion.
• Capacity: Dimensions: 70’-6” S/S X 72” OD
• Original Construction Code: ASME BPVC Sec. VIII Div. 1.
• Repair Code: NBIC Part 3.
• Original Materials: Shell and Heads SA-285-Gr. C with corrosion resistant integral cladding SS410.
• Solution: Replacement of the top of the tower with SA-516-70 material with corrosion resistant integral cladding ALLOY 400 (Monel).
• Scope: Project management, preparation of repair procedures and drawings to replace the top of the tower manufactured by others, ITP, qualification of welding procedures (for cladding and corrosion resistant weld overlay), welder qualification, NDE, Bakeout, PWHT, API-510 Inspection, API 579 FFS Assessment, quality assurance and quality control activities.
• Results: Safe return of atmospheric distillation tower to operation within the deadline.