API 579-1 | ASME FFS-1 Part 9 Fracture Mechanics Evaluations

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Combined ASME Section VIII, Div 3 and API 579-1/ASME FFS-1 Part 9 Fracture Mechanics Evaluations

Becht has its own proprietary spreadsheet-based analysis tool to determine the number of design cycles for pressure vessels, piping systems and storage tanks. The tool can be used for new construction or to evaluate crack-like flaws discovered in service. The unit of measure of life used in each workbook is years. The workbooks can manage up to three sets of finite element analysis results for different types of loading (e.g. pressure, thermal and transportation loads). Each of the three loads can be scaled using up to eight scale factors per load for a total of 24 load ranges. The total number of cycles per year for each load range is input as part of the cycle definitions section of the workbook. This provides the user with a

great deal of flexibility in defining the load cases and allows consideration of multiple simultaneous loads in crack growth modeling.

The method for fracture mechanics evaluation outlined in ASME Section VIII Division 3, 2010 Edition with the 2011 Addenda, Article KD-4 and Appendix D is the basis for the general calculation approach. The stress intensity factor and the reference stress solutions provided by API 579-1 / ASME FFS-1, 2007 Edition, Appendices C and D are used in conjunction with the ASME method. Most components are analyzed using a weight function approach for an arbitrary stress distribution in the uncracked component.

Crack growth rate factors for materials listed in ASME Section VIII Division 3 are built in to the program. In addition, provision is made for user input of crack growth factors for other materials and for hydrogen charging services. These factors may be entered as a function of the range of crack tip stress intensity or the minimum to maximum stress ratio.

ASME Section VIII, Div 3 and API 579-1/ASME FFS-1 Part 9 Fracture Mechanics Evaluations Combined Subscribe or View

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becht.comAPI 579-1 | ASME FFS-1 Part 9 Fracture Mechanics Evaluations

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