Contributing Authors: Eileen Chant, Greg Epremian, Ranjan Nadarajah, Mark Stonehouse
Summarized herein are the substantial changes to API 579-1/ASME FFS-1, Fitness for Service, that were incorporated in the 2016 edition, as reviewed by Becht Fitness for Service experts.
API 579-1/ASME FFS-1 is a Standard jointly published by API and ASME. The purpose of the document is to provide a consensus of methods to quantitatively evaluate commonly observed damage to in-service pressure equipment. Since it was first issued by API in 2000, this Fitness-For-Service standard has been used worldwide as a means of evaluating whether pressure equipment was fit for continued service, and in many cases, for how long. This standard has been used to avoid costly and unnecessary unplanned outages, while maintaining safe and reliable equipment.
The Second Edition was released in 2007, followed by the most current release of the document in June of 2016. In addition to the many clarifications, updated references to codes and standards, several changes and additions have been made to improve the standard in its most recent update. A change log has not been provided by the Joint API/ASME FFS Committee and this blog post aims to highlight the substantial changes.
In the 2007 edition, material properties needed for FFS assessments were provided in Annex F. In the 2016 edition, the material properties are no longer in a separate annex, but are instead moved to the assessment part where they are mostly referenced. For example, material data needed for creep assessments - Part 10 – are now found in Annex 10B. Another example is the previous Annex B1, which contained the procedures for demonstrating protection against various failure modes using stress analysis, which is now under Part 2 in Annex 2D.
Several of the assessment methodologies are no longer shown in full, e.g. plastic collapse analysis. Instead, the user is pointed to the corresponding Design-By-Analysis paragraphs of ASME BPVC Section VIII Division 2. Only differences between these two standards are explicitly addressed in API 579-1/ASME FFS-1, e.g. use of Remaining Strength Factor (RSF), β-factor in elastic-plastic analyses, etc.
Becht Engineering has extensive experience and expertise in the conduct of Fitness-For-Service. We have performed evaluations for all damage mechanisms covered in API 579-1/ASME FFS-1 for clients around the world. Our wealth of knowledge and experience enables us to provide authoritative, practical, knowledge based answers, and to solve your problems.
Additionally, our FFS experts developed and optimized our proprietary BechtFFS software. BechtFFS software is an API 579-1/ASME FFS-1 (2016 edition compliant) web-based software designed to assist operators/owners in evaluating equipment items which have developed defects in service. Read more about the software HERE.
If you are interested in trying out BechtFFS Software, please contact Eileen Chant (CLICK) to receive a free, 30-day trial.
Magnus Gustafsson has over 10 years experience in the design and analysis of mechanical components and systems in the Petrochemical and Railway industries. His experience includes Fitness-for-service assessments and design support of pressurized equipment including elastic-plastic Finite Element Analysis, transient heat transfer analysis, creep, high-and low cycle fatigue, fracture mechanics, fluid surge and piping flexibility analysis.
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