The replacement cycle of air compressor screw oil shall be comprehensively judged according to the oil type, operating environment, equipment working conditions and manufacturer's recommendations, usually 2000-8000 hours.. The following is a specific analysis:
1. the key factors affecting the replacement cycle
- oil type
- mineral oil: The replacement cycle is short, usually 2000-3000 hours.
- semi-synthetic oil: The performance is better than mineral oil, the replacement cycle is about 4000-6000 hours.
- synthetic oil: The oxidation resistance and high temperature resistance are the best, and the replacement cycle can reach 6000-8000 hours.
- Operating environment
- high temperature (>40 ℃): Accelerate oil oxidation and shorten life.
- High humidity or corrosive gas: Easy to cause oil emulsification or pollution.
- More dust: Increase the impurity content of the oil and replace it in advance.
- Equipment working condition
- continuous operation: Oil aging faster than intermittent operation.
- Load rate: Long-term high-load operation will aggravate oil deterioration.
- Manufacturer's recommendations
- different brands of air compressors have different requirements for screw oil, and the recommended cycle in the equipment manual must be strictly followed.
A Practical Method of 2. Judging the Timing of Replacement
- regular oil testing
- viscosity: If the viscosity changes by more than ± 10%, replace it.
- acid value when the acid value exceeds 2mgKOH/g, it indicates that the oil is severely oxidized.
- Moisture: When the moisture content is> 0.1%, check the condensed water and consider changing the oil.
- Pollutants: When metal particles or impurities exceed the standard, replace and check the equipment immediately.
- Observe the running state
- exhaust temperature: If the temperature continues to rise and exceeds the set value, the deterioration of the oil may cause insufficient lubrication.
- Noise and vibration: Abnormal noise or vibration may be caused by the deterioration of the lubrication performance of the oil.
3. measures to extend the life of screw oil
- optimize the operating environment
- keep the room ventilated, control temperature ≤ 40 ℃, humidity ≤ 60%.
- Install an air filter to reduce dust entering the air compressor.
- Specification of maintenance operations
- regularly clean the oil cooler, oil filter and oil-gas separator.
- Avoid mixing different brands or models of screw oil.
- Choose high quality oil
- according to the requirements of the equipment, select the appropriate grade of screw oil, preferably synthetic oil or semi-synthetic oil.
4. Summary
- regular cycle mineral oil 2000-3000 hours, semi-synthetic oil 4000-6000 hours, synthetic oil 6000-8000 hours.
- Dynamic adjustment: Adjust the replacement cycle flexibly in combination with oil test results and operation status.
- Core Principles: It is better to be early than late to avoid equipment failure caused by oil deterioration.
Recommendations: For the first oil change, refer to the manufacturer's recommended cycle, and then optimize according to the actual test data. For example, if the test shows that the oil index is good, the cycle can be extended appropriately; if the index is close to the critical value, it needs to be replaced in advance.
