Case Study

Level 3 Assessment for Volumetric Damage

Fitness For Service

Level 3 Assessment for Volumetric Damage

Problem

An owner-operator identifies volumetric damage (i.e., wall loss) due to internal or external corrosion that exceeds the design corrosion allowance for the equipment or piping system. The damage does not satisfy the API 579-1/ASME FFS-1 (API 579) Part 4 or Part 5 Level 1 or Level 2 acceptance criterion.

Solution

Generate a finite element analysis (FEA) model of the equipment and map the corrosion damage onto the model. Perform a Level 3 FFS assessment in accordance with API 579-1/ASME FFS-1 Part 2 and Part 5.

Value

  • Justify continued operation without repairs or minimize the extent of repairs necessary to achieve another operational run.
  • Establish a future corrosion allowance and corresponding remaining life.
  • Prevent unplanned outages.
  • Maintain turnaround schedule and budget.

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