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Analysis of Oil Leakage from the Air Filter Port of Screw Air Compressors

Analysis of Oil Leakage from the Air Filter Port of Screw Air Compressors
December 12, 2023

Screw air compressors are widely used in various industries for supplying compressed air. However, one common issue that arises with these machines is oil leakage from the air filter port. This article aims to explore the possible causes of this problem and provide an in-depth analysis of each factor.

screw air compressors

Causes of Oil Leakage:

1. Worn-out Air Filter:

The air filter plays a crucial role in removing contaminants from the intake air. Over time, the filter can become worn-out or clogged, leading to a decrease in filtration efficiency. As a result, oil particles can pass through the filter and accumulate at the air filter port, causing leakage. Regular inspection and timely replacement of the air filter can prevent this issue.


2. Excessive Oil Level:

The oil level in the compressor should be maintained within the recommended range. If the oil level exceeds the specified limit, it may find its way to the air filter port. This can occur due to overfilling or a faulty oil level sensor. Monitoring the oil level regularly and ensuring it remains within the recommended range is essential to prevent oil leakage.


3. Faulty Oil Separator:

The oil separator is responsible for separating oil from the compressed air before it enters the air filter. A defective or worn-out oil separator can fail to perform its function efficiently, leading to oil leakage. Regular maintenance and replacement of the oil separator as per the manufacturer's guidelines can help avoid this issue.


4. Improper Installation:

Improper installation of the air filter can also contribute to oil leakage. If the filter is not correctly sealed or if there are gaps in the housing, oil can leak through these openings. It is crucial to follow the manufacturer's instructions during installation to ensure a proper seal and prevent any potential leakage.


5. High Ambient Temperatures:

Operating the screw air compressor in high ambient temperatures can cause the oil to become thinner, reducing its viscosity. This can lead to oil leakage through the air filter port. Installing additional cooling systems or ensuring proper ventilation in the compressor room can help maintain the oil's viscosity within the recommended range.


6. Seal and Gasket Failure:

Seals and gaskets play a vital role in preventing oil leakage in various components of the screw air compressor. Over time, these seals and gaskets can deteriorate or become damaged, resulting in oil leakage from the air filter port. Regular inspection and replacement of worn-out seals and gaskets can prevent this issue.


Oil leakage from the air filter port of oil injected air compressor can be attributed to various factors such as worn-out filters, excessive oil levels, faulty oil separators, improper installation, high ambient temperatures, and seal and gasket failure. Regular maintenance, timely replacement of components, and adherence to manufacturer guidelines can help mitigate these issues. By addressing the root causes of oil leakage, the efficiency and longevity of screw air compressors can be significantly enhanced.

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