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.
How we work
At CANATUS Engineering Group, we work closely with clients to solve complex mechanical integrity and pressure equipment challenges through practical engineering, sound judgement, and collaboration. We stay hands-on throughout the process, combining technical analysis with real-world operating experience to deliver solutions that are technically rigorous, practical to implement, and focused on long-term reliability. We also believe in transferring knowledge to our clients, helping teams build confidence and capability rather than relying on black box solutions.
Other services

You run complex industrial assets and need confidence that your equipment will perform safely and reliably.
We understand the stakes and have extensive experience tackling complex challenges. Whether you are seeking emergency support or strategic solutions to chronic problems, we are prepared to help.

Ready to talk about your asset integrity challenges?
Whether you are seeking emergency support or strategic solutions to chronic problems, we are prepared to help.