In-Line Inspection for Unpiggable Pipelines - fitness for service remaining life assessment

By: Quest Integrity Group  06-Dec-2011
Keywords: Fired Heaters, Structural Components,

Quest Integrity Group’s Fitness-for-Service (FFS) assessment is a multi-disciplinary approach to evaluate structural components to determine if they are fit for continued service. The typical outcome of an FFS assessment is a “go/no-go” decision on continued operation. An evaluation of remaining life or inspection intervals may also be part of such an assessment, along with remediation of the degradation mechanism.

Quest Integrity Group has substantial FFS assessment experience and has applied its approach on a wide range of assets. Our staff has been heavily involved in the development of the API 579-1/ASME FFS-1 FFS standard, and many serve on the committee that maintains this document.

We are also the leading provider of Fitness-for-Service software. We have released 3 commercial applications that enable end-users to perform evaluations that range from routine Level 1 to highly advanced Level 3.

Flaw Type and Damage Mechanism Experience

  • Brittle fracture
  • Corrosion
  • Crack-like flaws
  • Fatigue
  • Creep
  • Stress corrosion cracking
  • Hydrogen embrittlement
  • High-temperature hydrogen attack


  • Fired heaters
  • Reformers
  • High-energy piping
  • Pipelines
  • Boiler tubes
  • Turbines
  • Headers
  • Power lines
  • Storage tanks
  • Pressure vessels

Additional Information

Keywords: Fired Heaters, Structural Components,

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