Fitness-For-Service (FFS) assessments are quantitative engineering evaluations, which are performed to demonstrate the structural integrity of an in-service component containing a flaw or damage. FFS is a methodology whereby flaws contained within a structure are assessed in order to determine the adequacy of the structure for continued service without failure.

Assessment Levels:

Level 1 Assessment
The assessment procedures included in this level are intended to provide conservative screening criteria that can be utilized with a minimum amount of inspection or component information.

Level 2 Assessment
The assessment procedures included in this level are intended to provide a more detailed evaluation that produces results that are more precise than those from a Level 1 assessment. In a Level 2 Assessment, inspection information similar to that required for a Level 1 assessment is needed; however, more detailed calculations are used in the evaluation.

Level 3 Assessment
The assessment procedures included in this level are intended to provide the most detailed evaluation that produces results that are more precise than those from a Level 2 assessment. In a Level 3 Assessment the most detailed inspection and component information is typically required, and the recommended analysis is based on numerical techniques such as the finite element method or experimental techniques when appropriate.

LifeTech Engineering have several FFS specialists who are able to implement FFS assessments using API 579-1/ASME FFS-1, 2016 in all levels. We have developed a software solution called FITest which covers all parts of API 579 including assessment of:

  1. Brittle Fracture
  2. General Metal Loss
  3. Local Metal Loss
  4. Pitting Corrosion
  5. Hydrogen Blisters and Hydrogen Damage Associated with HIC and SOHIC
  6. Weld Misalignment and Shell Distortions
  7. Crack-Like Flaws
  8. Components Operating in The Creep Range
  9. Fire Damage
  10. Dents, Gouges, And Dent-Gouge Combinations
  11. Laminations
  12. Fatigue Damage

 

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