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Fitness-For-Service (FFS)

Is the Equipment Safe to Operate?

Fitness-For Service (FFS) is the engineering approach used to determine whether equipment is safe to continue to operate with damage or defects.
The result of an FFS assessment is a determination of remaining life and a decision to run, repair, or replace the equipment. API 579-1/ASME FFS-1 (API 579) is the international Code that provides guidance on how to assess various types of damage, including:

Volumetric Damage (General Metal Loss, Local Metal Loss, or Pitting)
Fatigue and Fracture (Brittle Fracture or Cracking)
Geometric Imperfections (Distortion, Weld Misalignment, Dents, or Gouges)
High Temperature Creep
Hydrogen Damage

Although traditionally FFS technology tends to be utilized in a reactionary mode after damage is found, there are many ways that FFS technology can be employed proactively to enhance decisions made at every phase of the equipment life cycle.

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Case Studies

Level 3 Assessment for Geometric Imperfections

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

Level 3 Assessment for Cracking

An owner-operator identifies cracking in a vessel during on-stream inspections. The vessel is known to be susceptible to low temperature hydrogen damage (i.e., wet H₂S damage).

Level 3 Assessment for Volumetric Damage

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.

Proactive Fitness-For-Service for Wall Loss

Prior to executing an inspection of a process column for potential corrosion under insulation (CUI) damage, an owner-operator desires to establish go/no-go criterion to expedite run, repair, replace decisions.

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