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Fitness-For-Service: The User’s Guide to API 579-1/ASME FFS-1

By Greg Garic, Managing Principal at Stress Engineering Services, Inc.. October 24, 2019

Fitness-for-service assessments, according to API 579-1/ASME FFS-1, are defined as the "quantitative engineering evaluations that are performed to demonstrate the structural integrity of an in-service component that may contain a flaw or damage, or that may be operating under a specific condition that might cause a failure.” This guide, written by Greg Garic and published by Inspectioneering, is intended to provide a general overview of the concepts and approach to fitness-for-service. 

The outline of this guide is as follows:

  1. Introduction - Setting the Stage
    1. What is "Fitness-For-Service"?
    2. "It Takes a Village..."
    3. Roles of Different Codes and Standards
    4. Three Assessment Levels
    5. Current Integrity vs. Remaining Life
    6. Importance of Damage Mechanisms
  2. Assessment Techniques
    1. Part 3 - Brittle Fracture
    2. Part 4 - General Metal Loss
    3. Part 5 - Local Metal Loss
    4. Part 6 - Pitting
    5. Part 7 - Hydrogen Blisters, HIC, & SOHIC
    6. Part 8 - Weld Misalignment & Shell Distortions
    7. Part 9 - Crack-Like Flaws
    8. Part 10 - Creep
    9. Part 11 - Fire Damage
    10. Part 12 - Dents & Gouges
    11. Part 13 - Laminations
    12. Part 14 - Fatigue
  3. Acceptance Criteria
    1. Remaining Strength Factor (RSF)
    2. Failure Assessment Diagram (FAD)
    3. Other Miscellaneous Criteria
    4. Failing an Assessment vs. Failing a Component
  4. Conclusion


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