As the lubricant of the hydraulic system, the main function of lubricating oil is to reduce the wear of mechanical components. Therefore, it is very important to reduce the concentration of hard particle pollutants in the system circulation, especially for precision systems with small gaps. Particulate contaminants are generally removed through the use of filters. The ability of hydraulic oil to pass through a filter of a certain size without clogging is called filterability.

Analysis of Lubricating Oil Pollution Sources

The production of lubricating oil mainly includes four processes: raw material entering the factory, blending, filling and storage of finished products. The blending process basically realizes pipeline-type closed production, and the storage of finished products after filling is mainly in closed packaging. The main source is the introduction of raw materials, while the pollution caused by the operation process (including maintenance) is a secondary source. The pollution sources of refined oil include inherent pollutants, internally generated pollutants, external intrusion pollutants and pollution caused by maintenance.

1. Inherent pollutants
Inherent pollution of refined oil includes:

(1) The raw material oil itself contains impurities, such as the use of adsorbents in the processing of the base oil, which will be mixed into the base oil if improperly disposed of, resulting in base oil pollution;

(2) Improper cleaning of base oil storage tanks, truck tankers, trains, oil tankers and other means of transport, resulting in impurities in the base oil;

(3) Affected by the production process, impurities are mixed in the packaging.

2. Internal generation of pollutants
The main pollutants generated inside the lubricating oil are:

(1) Deterioration of oil products, such as precipitation of additives, mixing of different oil products, etc.;

(2) The inner wall of the oil tank is polluted by corrosive substances, such as the inner wall of the Q235 A material oil tank is rusted due to corrosion, causing oil pollution, especially the top of the tank and the tank wall above the safe liquid level and other parts that do not contact the oil;

(3) Impurities are generated by wear of conveying pumps and pipelines.

3. External intrusion of pollutants
The external intrusion pollutants come from the pollution caused by the breathing valve, the gauge port, the light transmission hole and the filling process.

4. Pollution caused by maintenance
The pollution caused by maintenance comes from the disassembly and assembly of the transfer pump and pipeline, and the pollution caused by welding.

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