ASME FFS 1 2021

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ASME FFS-1 – 2021 Fitness-for-Service

Published By	Publication Date	Number of Pages
ASME	2021	1478

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Category: ASME

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Description

Fitness-For-Service (FFS) Assessments are quantitative engineering evaluations that are performed to demonstrate the structural integrity of an in-service component that may contain a flaw or damage, or that may be operating under a specific condition that might cause a failure. This Standard provides guidance for conducting FFS Assessments using methodologies specifically prepared for pressurized equipment. The guidelines provided in this Standard can be used to make run-repair-replace decisions to help determine if components in pressurized equipment containing flaws that have been identified by inspection can continue to operate safely for some period of time. The methods and procedures in this Standard are intended to supplement and augment the requirements in API 510, API 570, API 653, and other post construction codes that reference FFS evaluations such as NB-23. The assessment procedures in this Standard can be used for FFS Assessments and/or rerating of equipment designed and constructed to the following codes: ASME BPV Codes – Section I, Section VIII Division 1, & Section VIII Division 2; ASME Piping Codes – B31.1, B31.3, B31.4, B31.8, & B31.12; API Standards 530, 620, & 650. The assessment procedures in this Standard may also be applied to pressure containing equipment constructed to other recognized codes and standards, including international and internal corporate standards. This Standard has broad applications since the assessment procedures are based on allowable stress methods and plastic collapse loads for non-cracklike flaws, and the Failure Assessment Diagram (FAD) Approach for crack-like flaws. The FFS Assessment procedures in this Standard cover both the present integrity of the component given a current state of damage and the projected remaining life. Qualitative and quantitative guidance for establishing remaining life and in-service margins for continued operation of equipment are provided in regards to future operating conditions and environmental compatibility. Assessment methods as well as material properties, Nondestructive Examination (NDE) guidelines, and documentation requirements are included to evaluate flaws including: general and localized corrosion, widespread and localized pitting, blisters and hydrogen damage, weld misalignment and shell distortions, crack-like flaws including environmental cracking, laminations, dents, and gouges. In addition, evaluation techniques are provided for condition assessment of equipment including resistance to brittle fracture, creep damage, and fire damage. The FFS Assessment procedures in this Standard can be used to evaluate flaws commonly encountered in pressure vessels, piping, and tankage. The procedures are not intended to provide a definitive guideline for every possible situation that may be encountered. However, flexibility is provided to the user in the form of an advanced assessment level to handle uncommon situations that may require a more detailed analysis.

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