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Overview of API 579 - Fitness-For-Service (FFS)

API 579-1 / ASME FFS-1, Fitness-For-Service, Third Edition, is a standard developed and published by the American Petroleum Institute (API) that describes several fitness-for-service (FFS) assessment techniques for pressurized equipment used in the oil & gas, petrochemical, and chemical industries. The latest edition was published in June of 2016.

API 579 gives procedures for performing proper fitness for service evaluations and ensuring the safe and reliable operation of older plants and existing facilities. This standard contains numerous sections on assessment procedures for calculating the impact of damage mechanisms such as brittle fracture, general metal loss and local metal loss, pitting corrosion, blisters and laminations, weld misalignment and shell distortion, crack-like flaws, creep damage, and fire damage.

This standard has procedures for several different types of equipment that may contain flaws or damage. These include the evaluation and rerating of pressure vessels designed based on the the ASME Boiler and Pressure Vessel Code, and piping systems that were constructed to either the ASME B31.3 Piping Code or those constructed under API 650 and 620, along with pressure containing equipment constructed to any other codes that are recognized in the publication. The assessments laid out in this RP can provide information on the current state of damage, as well as offer an estimate for the projected remaining life.

API 579 also has appendices on several other important topics, such as equations for determining MAWP, thickness, and stress in components, methods of stress analysis for Level 2 and Level 3 FFS assessments, a compendium of stress intensity solutions, guidance on material properties, failure modes and damage mechanisms, validation of assessment procedures, and information on submitting technical inquiries to API, among other things.


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              Inspectioneering Staff, January 3, 2019

              The 2019 API Inspection and Mechanical Integrity Summit is just around the corner. The conference presentations, panel discussions, and exhibition kick off on Tuesday, January 29th and run through Thursday, January 31st at the Galveston Convention Center. However, on Monday, January 28th, there will be 14 training courses provided by well-known experts in their respective fields of endeavor. Don’t miss out on these great training opportunities at prices below what other training sources normally charge!

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