How often does the air compressor need to be filled with lubricating oil?

The replacement cycle of air compressor lubricating oil is not fixed, but is affected by many factors, including the type of lubricating oil, the type of air compressor, the working environment and the frequency of use. The following is a detailed summary of the air compressor lubricating oil replacement cycle according to different circumstances:

1. by oil type

• mineral oil:

  • it is usually recommended to replace it every 3 to 4 months.
  • It is also recommended that mineral lubricants be replaced in 2000 to 3000 hours.

• semi-synthetic oil:

  • it is generally recommended to replace it every 6 to 8 months.
  • It is also recommended to replace it after 4000~6000 hours.

• Fully synthetic engine oil:

  • it is recommended to replace it every 10 to 11 months.
  • It is also recommended to replace it after 6000 to 8000 hours.

2. by air compressor type

• newly purchased air compressor:

  • new oil must be replaced after 500 hours of first operation, followed by the normal oil change cycle.

• Screw air compressor:

  • new screw air compressors generally need to replace the lubricating oil after 500 hours of operation, and then every 2000 to 4500 hours, depending on the operating environment and the specific conditions of the machine.
  • For the displacement of 3~10m & sup3;/min medium-sized screw air compressor, in the general industrial environment, under normal working load, the lubricating oil replacement cycle is about 2000~3000 hours. However, if this type of air compressor is used in a polluted environment (such as textile mills, with fiber dust) or with high load changes (such as some small machinery manufacturing plants), the replacement cycle may be adjusted to 1500~2000 hours.
  • Large screw air compressors (displacement greater than 10m & sup3;/min) are usually used in heavy industry, such as mines, steel plants, etc. This type of air compressor has a large lubricating oil capacity, but due to the harsh working environment and high load, the lubricating oil is polluted and deteriorated faster. Under ideal conditions, the lubricant replacement cycle may be 2500 _{3500 hours, but in the actual heavy industrial conditions, such as the presence of a large amount of dust, high temperature, high humidity, etc., may need every 1500} replace the lubricating oil every 2500 hours to ensure the stable operation of the air compressor.

3. other influencing factors

• high temperature environment: High temperature will accelerate the oxidation and evaporation of lubricating oil, and at the same time reduce its viscosity and affect the lubrication effect. Under high temperature conditions, the lubricating oil replacement cycle may be 30% shorter than normal _{50%. For example, an air compressor that was originally replaced every 2500 hours under normal conditions may be 1250 under high temperature conditions.} It needs to be replaced in 1750 hours.
• High humidity environment: Moisture in the air easily enters the air compressor and is mixed into the lubricating oil, causing the lubricating oil to emulsify. The lubricating performance of the emulsified lubricating oil is reduced, which is easy to cause component wear and corrosion. In high humidity environment, the replacement cycle of lubricating oil is 20% shorter than that in dry environment _{40%. For example, an air compressor with a normal 3000-hour replacement cycle may need to be 1800 in a high humidity environment.}2400 hour replacement.
• Dusty environment: A large number of dust particles will enter the air compressor with the air intake and be mixed into the lubricating oil, which will make the lubricating oil dirty and increase wear. Under dusty conditions, the lubricant replacement cycle may need to be shortened to 50% of the normal cycle. _{70%. For example, an air compressor that normally replaces lubricating oil for 2000 hours may be 1000 under dusty conditions.} It needs to be replaced in 1400 hours.
• Frequent start and stop: For air compressors that start and stop frequently, the starting current of the motor is large each time it starts, which will impact the electrical system and mechanical parts, and also affect the performance of the lubricating oil. At the moment of starting, the lubricating oil may not form a good oil film on the surface of the component in time, resulting in local dry friction. This frequent impact and friction will accelerate the deterioration of the lubricating oil. For the air compressor with frequent start and stop (more than 10 times a day), the lubricating oil replacement cycle may be 20% ~ 30% shorter than that of the air compressor with normal continuous operation.
• chemical pollution in an environment with chemical pollution, chemical gases may enter the air compressor and react with the lubricating oil, changing the chemical properties of the lubricating oil and causing it to lose its original performance. In this case, the replacement cycle of the lubricating oil should be determined according to the type and concentration of chemical pollution, but it is usually significantly shorter than normal, and may only be 30% to 60% of the normal cycle.

4. other suggestions

• regular inspection: In addition to replacing the oil according to the above cycle, it is recommended to conduct regular oil testing to detect the deterioration of the oil in time and determine whether the oil needs to be replaced in advance based on the test results.
• Follow manufacturer's recommendations air compressors of different brands and models may have different requirements and replacement cycles for oil. Therefore, in actual operation, the recommendations and guidance of the air compressor manufacturer should be followed first.

In general, the replacement cycle of the air compressor lubricating oil should be adjusted flexibly according to the specific situation to ensure the normal operation of the air compressor and extend its service life. In actual operation, it is recommended to determine the replacement cycle of lubricating oil reasonably in combination with the detection and analysis results of lubricating oil.