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A B C D E F H I K M N O P R S T V W
Fa Fi Fo Fr
Fib Fit

Fitness for Service

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Definition: Fitness for Service (FFS) is the systematic assessment of whether a damaged or defective component can continue to be operated safely. It is based on analytical methods for evaluating corrosion, cracks or wall thickness loss. API 579-1/ASME FFS-1 is particularly internationally recognised.

Practical relevance: The assessment takes into account the damage mechanism, remaining wall thickness, material characteristics, loading and safety factors. Typical types of damage are local corrosion, crack formation or deformation. FFS analyses avoid unnecessary shutdowns, provided that structural integrity has been demonstrated by calculation.

Decision-making perspectives:

  • Technical decision-makers: Defining continued-operation, repair or replacement strategies.
  • Purchasing/project management: Economic trade-off between repair and replacement investment.
  • Science: Application of fracture mechanics models and remaining service life calculations.
  • Insurance/law: Demonstrating safe continued use despite documented damage.

Typical testing or verification methods: Wall thickness measurement (UT), fracture mechanics assessment, RBI analysis, materials testing.

FAQ:

  • When is a fitness-for-service assessment carried out?
  • When damage has been identified and the safe continued use of a component is to be assessed by calculation.
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