API 579-1/ASME FFS-1《服务适用性》中的服务适用性（FFS）评估是一种工程评估，旨在证明在役部件的结构完整性，该部件可能存在缺陷或损坏，或可能在可能导致故障的特定条件下运行。API 579-1/ASME FFS-1提供了使用专门为加压设备准备的方法进行FFS评估的指南。本标准中提供的指南可用于做出运行-维修-更换决定，以帮助确定含有通过检查发现的缺陷的承压设备是否可以在一段时间内继续安全运行。API 579-1/ASME FFS-1的这些FFS评估目前被API规范和标准（510、570和653）以及NB-23认可和引用为评估压力容器结构完整性的合适方法，检查发现设备退化和缺陷，或运行条件表明可能存在故障风险的管道系统和储罐。 本文件提供了API 579-1/ASME FFS-1中描述的适用性评估所需的使用和计算示例问题。以国际单位制和美国惯用单位制为所有计算程序提供了示例问题。本标准第2部分介绍了本文件中的示例问题。本文档的其余部分包含示例问题。本文件中的零件与API 579-1/ASME FFS-1中的零件一致。例如，本文件第5部分提供了说明局部薄面积计算的示例问题。这与API 579-1/ASME FFS-1第5部分中包含的局部薄区域评估程序一致。

Fitness-For-Service (FFS) assessments in API 579-1/ASME FFS-1 Fitness-For-Service are 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 specific conditions that could produce a failure. API 579-1/ASME FFS-1 provides guidance for conducting FFS assessments using methodologies specifically prepared for pressurized equipment. The guidelines provided in this standard may be used to make runrepair-replace decisions to help determine if pressurized equipment containing flaws that have been identified by inspection can continue to operate safely for some period of time. These FFS assessments of API 579-1/ASME FFS-1 are currently recognized and referenced by the API Codes and Standards (510, 570, & 653), and by NB-23 as suitable means for evaluating the structural integrity of pressure vessels, piping systems and storage tanks where inspection has revealed degradation and flaws in the equipment or where operating conditions suggest that a risk of failure may be present.Example problems illustrating the use and calculations required for Fitness-For-Service Assessments described in API 579-1/ASME FFS-1 are provided in this document. Example problems are provided for all calculation procedures in both SI and US Customary units.An introduction to the example problems in this document is described in Part 2 of this Standard. The remaining Parts of this document contain the example problems. The Parts in this document coincide with the Parts in API 579-1/ASME FFS-1. For example, example problems illustrating calculations for local thin areas are provided in Part 5 of this document. This coincides with the assessment procedures for local thin areas contained in Part 5 of API 579-1/ASME FFS-1.