m vakilian - M. Sc., Engineering & Design Department, Fateh Sanat Kimia Company, Great Industrial Zone, Shiraz, Iran
k kamali - M. Sc., Engineering & Design Department, Fateh Sanat Kimia Company, Great Industrial Zone, Shiraz, Iran
z Kheirandish - PhD student, School of Mechanical Engineering, Shiraz University of Technology, Shiraz, Iran

The ASME and API new construction codes and standards for pressurized equipment provide rules for the design, fabrication, inspection and testing of new pressure vessels, piping systems, and storage tanks. These codes typically do not provide rules to evaluate equipment that degrades while in-service and deficiencies caused by degradation or from original fabrication that may be found during subsequent inspections. 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 runrepair- 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.

Crack-Like Flaw, Fitness-For-Service, Pressure Vessel, API-579, ASME FFS-1, Failure Assessment Diagram.