August 2020

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Maintenance: Use of finite element analysis results in a future fitness-for-service

A low-pressure separator with 139-in. (inner diameter) × 0.59-in. thickness was found to have severe external thinning due to corrosion under fire (CUF) proofing.

Tharakan, J., Suncor Energy Inc.

A low-pressure separator with 139-in. (inner diameter) × 0.59-in. thickness was found to have severe external thinning due to corrosion under fire (CUF) proofing. Cracks in the fireproofing, marine environment and the age of the vessel all led to CUF at multiple locations. The gravity of damage became clear when fire proofing was removed at one area for online inspection. The separator was a carbon steel vessel designed to 174 psig at 230°F (110°C) per ASME Section VIII-2, 1988. A Level 2 fitness for service (FFS) assessment carried out at the first area inspected did not pass the assessment for local thin area (LTA) as per rules in Part 5 of API 579-1. Parallel to inspection efforts, a Le

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