SAE J3291涵盖了用于在汽车空调系统中容纳和循环润滑剂、液体和气态制冷剂的软管和连接软管组件。本推荐实践将用于建立软管、软管组件或非金属管路组件的验证要求，以及考虑用于汽车空调系统的任何新制冷剂或制冷剂混合物。 本文件涵盖的新制冷剂和混合物不包括当前的制冷剂R134a、R1234yf和R152a。本文件不涵盖以前使用的制冷剂R12，也不涵盖跨临界系统中使用的制冷剂，如R744。 系统制造商有责任确保对新的制冷剂、混合物和润滑剂组合以及预期的软管材料进行充分的兼容性测试。推荐的测试包括但不限于体积膨胀、分层和快速减压。这些测试不包括在本推荐实践的范围内。 如果最终标准中的测试方法或验收标准未发生实质性变更，则根据本推荐实践进行测试时收集的数据应适用于最终标准发布时的最终标准。 根据SAE J2911认证的详细信息将包含在未来的修订版中。

SAE J3291 covers hoses and coupled hose assemblies intended for containing and circulating lubricant, liquid, and gaseous refrigerant in automotive air-conditioning systems. This recommended practice will be used to establish requirements for the validation of hoses, hose assemblies, or nonmetallic line assemblies with any new refrigerant or refrigerant blend being considered for use in automotive air-conditioning systems. The new refrigerants and blends covered by this document do not include current refrigerants R134a, R1234yf, and R152a. This document does not cover previously used refrigerant R12 nor refrigerants used in transcritical systems, such as R744. It is the system manufacturer’s responsibility to ensure that adequate compatibility testing is completed with new refrigerants, blends, and lubricant combinations together with intended hose materials. The recommended tests include, but are not limited to, volume swell, delamination, and rapid decompression. These tests are not included in the scope of this recommended practice. Data gathered while testing to this recommended practice shall be acceptable as applied to the final standard when released, providing that no substantive changes to the test methods or acceptance criteria have been made in the final standard. Details for certification per SAE J2911 will be included in a future revision.