|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alumina & Bauxite
||Fitness-for-service Assessment and Re-rating of Flawed Alumina Feeding Vessels
||Maher Al-Dojayli, Kyle Chomyn, Hamid Ghorbani, Patrice Barriault
|On-Site Speaker (Planned)
In aged alumina processing plants, existing equipment are often operating near the ends of their design lives. Metal loss, structural distortion and crack-like flaws may also be detected in these equipment, which can cause equipment failures and operational safety hazards. Replacement and/or major repair of aged equipment may incur high capital cost and losses in production revenue. Fitness-for-service (FFS) assessment based on API 579-1/ASME FFS-1 code is a robust approach to reliably assess the remaining life of existing equipment. This paper presents an application of this FFS assessment for rerating and life extension of alumina feeding vessels with metal loss and crack-like flaws. Minimum thickness requirements, allowable remaining fatigue life, and permissible crack sizes were specified based on Non-destructive testing (NDT) results. This assessment allowed the plant to identify and safely repair high-risk vessels without major production outage, and provided valuable information for planning future NDT, monitoring and repair works.
||Planned: Light Metals