Case Study

Level 3 Assessment for Geometric Imperfections

Fitness For Service

Level 3 Assessment for Geometric Imperfections

Problem

An owner-operator identifies distortion in a vessel as a result of a poorly engineered PWHT layout.

Solution

Implement an API 579-1/ASME FFS-1 (API 579) Part8 Level 3 Fitness-For-Service (FFS) assessment to assess the risk for plastic collapse, buckling, and local failure (i.e., cracking). For equipment operating in cyclic service, evaluate the reduction in fatigue life due to the elevated local bending stresses imposed by the geometric imperfections. For equipment operating in high temperature applications, evaluate the reduction in creep life due to the elevated local bending stresses imposed by the geometric imperfections.

Value

  • Identify any risks associated with continued operation without repairs.
  • Avoid turnaround extensions due to unplanned repairs.
  • Gain an understanding of whether the damage will affect the remaining life of the equipment.

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