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Fitness for Service Level II Calculations (FFS Level II)

Fitness-For-Service ( FFS ) assessments are 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. These calculations provide guidance that can be used to make run-repair-replace decisions to help determine if components in pressurized equipment containing flaws that have been identified by inspection can continue to operate safely for some period of time. These FFS assessments are currently recognized and referenced by the API Codes and Standards (510, 570, & 653), and by NB-23 as suitable means for evaluating the structural integrity of pressure vessels, piping systems and storage tanks where inspection has revealed degradation and flaws in the equipment.  FFS methodology has multiple levels with each successive level 1-3 requiring increasing amounts of data, calculations, expertise and cost to attain the most precise outcome of the asset’s remaining life.

Benefits of performing a FFS Calculation Level II:

  • Operation of a vessel safely for a determined amount of time
  • Increased remaining life of the equipment
  • Continued use of equipment despite small flaws
  • Cost savings for unnecessary repairs or replacement of vessels
  • Lowers the potential risks to personnel
  • Can produce improved yields

 


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