自1922年以来，ASME一直在定义管道安全。ASME B31.5涵盖温度低至-320°F（-196°C）的制冷剂、传热部件和二次冷却剂管道，无论是安装在现场还是工厂组装。建议用户注意，其他管道规范章节可能会对其各自管辖区内的制冷管道提出要求。本规范不适用于符合美国保险商实验室或其他国家认可的测试实验室要求的任何独立或单元系统。它也不适用于水管；无论大小，设计用于外部或内部表压不超过15 psi（105 kPa）的管道；或压力容器、压缩机或泵。然而，B31.5包括从与该设备相邻的第一接头开始的所有连接制冷剂和二次冷却剂管道。 本版本的主要变更包括对法兰面、铸铁法兰螺栓以及灰铸铁和可锻铸铁材料章节的修订。B31.5规定了材料、设计、制造、装配、安装、测试和检验的全面解决方案。它也是ASME B31.1《动力管道规范》以及ASME B31系列其他规范的补充。总之，它们仍然是从事管道工作的任何人的重要参考。仔细应用这些B31规范将有助于用户遵守其管辖范围内的适用法规，同时实现从这些卷中详细介绍的许多行业最佳实践中获得的运营、成本和安全效益，以及制冷管道和传热部件的制造商。

ASME has been defining piping safety since 1922.ASME B31.5 covers refrigerant, heat transfer components, and secondary coolant piping for temperatures as low as -320°F (-196°C), whether erected on the premises or factory assembled. Users are advised that other piping Code Sections may provide requirements for refrigeration piping in their respective jurisdictions.This Code does not apply to any self-contained or unit systems subject to the requirements of Underwriters Laboratories or other nationally recognized testing laboratory. It also does not apply to water piping; piping designed for external or internal gage pressure not exceeding 15 psi (105 kPa) regardless of size; or pressure vessels, compressors, or pumps. However, B31.5 does include all connecting refrigerant and secondary coolant piping starting at the first joint adjacent to such apparatus.Key changes to this edition include revisions to sections on flange facings, bolting for cast iron flanges, and grey iron and malleable iron materials.B31.5 prescribes comprehensive solutions for materials, design, fabrication, assembly, erection, testing and inspection. It also serves as a companion to ASME's B31.1 Code on Power Piping as well as to the other codes in ASME's B31 series. Together, they remain essential references for anyone engaged with piping.Careful application of these B31 codes will help users to comply with applicable regulations within their jurisdictions, while achieving the operational, cost and safety benefits to be gained from the many industry best-practices detailed within these volumes.Intended for designers, owners, regulators, inspectors, and manufacturers of refrigeration piping and heat transfer components.