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Screw air compressors are widely used in various industrial applications for their efficiency and reliability in providing compressed air. However, one common issue that arises with these compressors is the presence of oil in the discharged air. This raises the question: why does the gas discharged from a screw air compressor contain oil?

The presence of oil in the discharged gas from a screw air compressor can be attributed to several factors. One of the primary reasons is the lubrication system of the compressor itself. Screw air compressors require lubrication to reduce friction and wear between the moving parts, such as the rotors and bearings. The lubricant used in these compressors is typically oil-based, and a small amount of this oil can be carried over into the compressed air during the compression process. This oil carryover can occur due to the close proximity of the rotors and the lubricant, as well as the high pressures and temperatures involved in the compression process.

Additionally, the design and condition of the compressor's air/oil separation system can also contribute to the presence of oil in the discharged gas. If the separation system is not functioning properly or if it is not well-maintained, it may allow oil to pass through and mix with the compressed air. This can result in the contamination of the discharged gas with oil particles, leading to potential issues in downstream equipment and processes.

Furthermore, the type of oil used in the compressor can also play a role in the oil carryover into the discharged gas. Some compressor oils are more prone to carryover than others, depending on their viscosity, volatility, and chemical composition. Using the correct type of oil and ensuring proper maintenance of the compressor and its components can help minimize oil carryover and reduce the contamination of the discharged gas.

In conclusion, the presence of oil in the gas discharged from a oil injected air compressor is a common issue that can be attributed to various factors such as the lubrication system, air/oil separation system, and the type of oil used. Understanding these factors and implementing proper maintenance and operational practices can help mitigate the issue of oil carryover and ensure the delivery of clean, oil-free compressed air for industrial applications.