ISO 10439-4:2015规定了最低要求，并为石油，石油化工和天然气工业中处理天然气或加工空气的特殊用途应用的轴流压缩机，单轴和整体齿轮式离心压缩机和膨胀机 - 压缩机提出建议。除了ISO 10439-1:2015中规定的一般要求外，ISO 10439-4:2015还规定了膨胀机 - 压缩机的要求

ISO 10439-4:2015 specifies minimum requirements and gives recommendations for axial compressors, single-shaft, and integrally geared process centrifugal compressors and expander-compressors for special purpose applications that handle gas or process air in the petroleum, petrochemical, and natural gas industries. ISO 10439‑4:2015 specifies requirements for expander-compressors, in addition to the general requirements specified in ISO 10439‑1:2015.