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

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Overview

Fitness-for-Service (FFS) 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 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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