Steel Structures 

Fitness-for-Service (FFS) is an assessment that is carried out using standardized methods and criteria, that evaluates the structural integrity of an asset/component to determine whether the asset/component is suitable for its intended use.

The Fitness-for-Service (FFS) assessment provides a quantitative measure of structural integrity and is part of asset integrity management. The assessments are used to highlight the need for replacement or repair of assets/components.

Two of the most commonly used are the recommended practice for assessing fitness-for-service published by the American Petroleum Institute (API) in API 579 and the guidance for the assessment of defects metallic structures published by British Standards in BS 7910.

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BS 7910 - Guide to methods for assessing the acceptability of flaws in metallic structures

2015

This British Standard gives guidance and recommendations for assessing the acceptability of flaws in all types of structures and components. Although emphasis is placed on welded fabrications in ferritic and austenitic steels and aluminium alloys, the procedures may be used for analyzing flaws in structures made from other metallic materials and in non-welded components or structures. The methods described are applicable at the design, fabrication and operational phases of a structure’s life.

BSI

Upon Request

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BS ISO 27306 - Metallic materials - Method of constraint loss correction of CTOD Fracture toughness for fracture assessment of steel components

2016

This International Standard specifies a method for converting the CTOD (crack-tip opening displacement) fracture toughness obtained from laboratory specimens to an equivalent CTOD for structural components, taking constraint loss into account. This method can also apply to fracture assessment using the stress intensity factor or the J-integral concept

This International Standard deals with the unstable fracture that occurs from a crack-like defect or fatigue crack in ferritic structural steels. Unstable fracture accompanied by a significant amount of ductile crack extension and ductile fractures are not included in the scope hereof

BSI

Upon Request

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BS 7608 -Guide to fatigue design and assessment of steel products

2015

This Standard provides methods for assessing the fatigue life of parts of steel products that are subject to repeated fluctuations of stress.

BSI

 Upon Request

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Inspectioneering Journal - FFS Forum - What is a Major Structural Discontinuity

2019

This document discusses the major structural discontinuity ,what a major structural discontinuity is, and why it is so important in fitness-for service (FFS) assessments.

Greg Garic

Upon Request