Fitness for Services (FFS)

Fitness for Services (FFS)

FFS assessments are quantitative engineering evaluations that are performed to demonstrate the structural integrity of an in-service component that may contain a flaw or damage.

FFS assessments are currently recognized and referenced by the API Codes and Standards (510, 570, & 653), and by NB-23 as suitable means for evaluating the structural integrity of pressure vessels, piping systems and storage tanks where inspection has revealed degradation and flaws in the equipment.

Flaws that can be assessed (API-579):
  • Brittle Fracture
  • General Metal Loss
  • Local Metal Loss
  • Pitting Corrosion
  • Blisters and HIC/SOHIC Damage
  • Weld Misalignment and Shell Distortions
  • Crack-Like Flaws
  • High Temperature Operation and Creep
  • Fire Damage
  • Dent, Gouge, and Dent Gouge Combinations
  • Laminations

FFS assessments are performed in compliance with standards ASME B31G, BS 7910, etc.


  • Identification of the main damage mechanisms and FFS analysis evaluation based on best approach and applicable standards (API 579, BS 7910, etc.)
  • Issue of recommendations in terms of remedial actions and/or a mitigation plan to run safely the equipment/plant
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