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API 579-1 / ASME FFS-1
Fitness-for-service assessment of in-service equipment
This page describes fitness-for-service assessment of in-service equipment and the associated engineering assessment topics. Project use requires qualified inputs and engineering review.
Assessment topics
- Run a Level 1 / Level 2 general and local metal-loss assessment from wall-thickness readings against the design pressure.
- Estimate remaining strength and the maximum allowable working pressure.
- State the assumptions and where a Level 3 (detailed) assessment would be needed.
Related standards
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Questions
What is fitness-for-service?
A quantitative check of whether equipment with damage — corrosion, cracks, dents — is still fit to operate. API 579-1/ASME FFS-1 gives the assessment levels and acceptance criteria.
What assessment outputs are described?
General and local metal loss at Levels 1 and 2 from wall-thickness readings against the design pressure, returning the remaining strength and the allowable pressure, with the assumptions traced.
Discuss a API 579-1 / ASME FFS-1 assessment
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