API 579-1 ASME FFS-1-2007 Fitness-for-Service-Second Edition

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API 579-1 ASME FFS-1-2007 Fitness-for-Service-Second EditionPractice 579， Fitness-For-Service.
In contrast to the straightforward and conservative calculations that are typically found in design codes，
more sophisticated assessment of metallurgical conditions and analyses of local stresses and strains can
more precisely indicate whether operating equipment isfit for its intended service or whether particular
fabrication defects or in-service deterioration threaten its integrity. Such analyses offer a sound basis for
decisions to continue to run as is or to alter， repair， monitor， retire or replace the equipment.
The publication of the American Petroleum Institutes Recommended Practice 579， Fitness-For-Service，
in January 2000 provided the refining and petrochemical industry with a compendium of consensus
methods for reliable assessment of the structural integrity of equipment containing identified flaws or
damage. API RP 579 was written to be used in conjunction with the refining and petrochemical industrys
existing codes for pressure vessels， piping and aboveground storage tanks (API 510， API 570 and API
653). The standardized Fitness-For-Service assessment procedures presented in API RP 579 provide
technically sound consensus approaches that ensure the safety of plant personnel and the public while
aging equipment continues to operate， and can be used to optimize maintenance and operation practices，
maintain availability and enhance the long-term economic performance of plant equipment.
Recommended Practice 579 was prepared by a committee of the American Petroleum Institute with
representatives of the Chemical Manufacturers Association， as well as some individuals associated with
related industries. It grew out of a resource document developed by a Joint Industry Program on Fitness-
For-Service administered by The Materials PropertiesCouncil. Although it incorporated the best practices
known to the committee members， it was written as a Recommended Practice rather than as a mandatory
standard or code.
While API was developing Fitness-For-Service methodology for the refining and petrochemical industry，
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