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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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Related Topics

API 560 - Fired Heaters for General Refinery Service API 594 - Check Valves: Flanged, Lug, Wafer, and Butt-Welding API 620 - Design and Construction of Large, Welded, Low-Pressure Storage Tanks API 650 - Welded Tanks for Oil Storage API 660 - Shell-and-Tube Heat Exchangers API 661 - Petroleum, Petrochemical, and Natural Gas Industries Air-Cooled Heat Exchangers API RP 1173 - Pipeline Safety Management Systems API RP 1176 - Assessment and Management of Cracking in Pipelines API RP 538 - Industrial Fired Boilers for General Refinery and Petrochemical Service API RP 571 - Damage Mechanisms Affecting Fixed Equipment in the Refining Industry API RP 576 - Inspection of Pressure-Relieving Devices API RP 580 - Risk Based Inspection (RBI) API RP 581 - Risk Based Inspection Technology API RP 75 - Developing a Safety and Environmental Management Program for Offshore Operations API RP 939-C - Guidelines for Avoiding Sulfidation (Sulfidic) Corrosion Failures in Oil Refineries API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures International Organization for Standardization (ISO)

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Articles about API 579 - Fitness-For-Service (FFS)
  • September/October 2018 Inspectioneering Journal
    By Greg Garic at Stress Engineering Services, Inc.

    In this column, I touch on what I see as an underused FFS technique for corrosion assessment: point assessment of corrosion – a technique that does NOT require a thickness grid. The reason I find this technique useful is largely because it’s so easy and cheap to implement.

  • July/August 2018 Inspectioneering Journal
    By Greg Garic at Stress Engineering Services, Inc.

    API 579-1 is a complex document covering several different types of equipment that may contain flaws or damage. Due to its complexity, this article condenses it into six things you need to know.

  • May/June 2002 Inspectioneering Journal
    By Greg Alvarado at Inspectioneering Journal, and C.P. Hsiao

    We have discussed various factors that can affect the reliability of NDE techniques (i.e., probability of detection - POD and sizing accuracy) in Part 1. In general, it is difficult to quantify these uncertainties. In fact, it is impossible to fully quantify the uncertainties in NDE results. However, one can achieve a higher level of reliability by reducing or minimizing the uncertainties. We will discuss some of the steps one can take to minimize the uncertainties in NDE results. By minimizing or reducing the uncertainties in NDE results, FFS assessments can be less conservative, and thus provide more margin to the serviceability of the equipment.

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