Screw type air compressor is widely used in various industries, such as glass industry, food processing industry, textile industry, ceramic industry, metal manufacturing industry, electronic industry, etc. An efficient air compressor is a piece of essential general equipment. However, when users use the screw type air compressor, they will encounter some problems more or less. The large differential pressure of oil is one of the common faults. So, what are the reasons for the oil differential pressure failure of screw type air compressor? The following is a list of five common causes of differential pressure failure of screw type air compressor.
1. The air intake system is not tightly sealed.
The environment around the station of screw type air compressor requires clean air and good ventilation. However, some users (such as some cement plants, concrete mixing plants, garbage power plants, etc.) have much dust in the working environment of screw type air compressors due to their poor production environment. When the particulate impurities exceed the air filter load of the screw type air compressor, they will enter the screw type air compressor through suction and compression action. Part of the dust and particulate impurities will be intercepted by the oil, resulting in the rapid rise of the oil’s precise differential pressure, thus causing the failure.
Solution： The intake system of the screw type air compressor should be sealed tightly in time. Add a pre-filter device before air filter intake or switch to a nano heavy-duty air filter. At the same time, replace the air filter of the screw type air compressor in advance.
2. Inappropriate engine oil selection
Improper selection of engine oil, incomplete maintenance and oil change, residual old engine oil mixed with new engine oil, or poor lubricating oil may cause the oil differential pressure fault of screw type air compressor.
Solution：After using the screw type air compressor, you should observe whether the lubricating oil is abnormal. If there are viscous substances, carbon deposition, and peculiar smell in the lubricating oil, it likely deteriorates. You are recommended to clean the oil system, drain it thoroughly, and then replace high-quality lubricating oil. At the same time, you should choose the glass fiber oil filter with higher filtration efficiency and stronger pollutant absorption capacity for the screw air compressor.
3. Oil deterioration caused by the high temperature of screw type air compressor.
Oil deterioration caused by the high temperature of screw type air compressor will lead to large oil partial pressure difference. The service life of screw type air compressor lubricating oil is generally 6000-8000 hours. However, the oil’s service life will be significantly reduced if the screw type air compressor’s temperature is too high. Suppose the screw type air compressor’s cooling effect is not good, and the exhaust temperature is higher and higher. In that case, the oil will deteriorate and accumulate carbon when it is serious. Simultaneously, as separating engine oil and compressed air, the deteriorated oil or carbon pollutants also stay on the oil filter material, blocking the small holes of the oil filter material, resulting in increased resistance and differential pressure.
Solution： Avoid long-term high-temperature operation of screw type air compressor and change the deteriorated oil in time.
4. Long-term low-temperature operation of screw type air compressor.
When the screw type air compressor’s operating temperature is lower than 75 ℃, the condensation water in the oil separator will coalesce. When water permeates into the oil filter paper, the oil filter paper will be affected by moisture. The air permeability of the filter paper will decrease, which will increase the resistance of the oil filter paper. The oil differential pressure will give an alarm.
Solution： Increase the operating temperature of the screw type air compressor, preferably at 80-95℃.
5. The sensor system of oil differential pressure falsely reports oil differential pressure.
When the panel shows that the differential pressure of oil is negative or the initial differential pressure exceeds 0.2kg, and the differential pressure of oil rises rapidly when the oil is in good condition, most of which are false reports from the differential pressure detection system.
Solution：Replace the sensor of oil differential pressure.
I believe the above analysis and suggestions can answer many questions for you. However, although it is essential to pay attention to maintenance and timely find fault problems, choosing a high-quality screw air compressor can reduce the probability of failure and help you reduce much trouble. How to choose an efficient air compressor? B&D is the best choice. B&D is a professional air compressor supplier. We provide one-stop screw air compressor solutions for the glass industry, food process industry, textile industry, ceramic industry, metal fabrication industry, and electronics industry. Our product series includes the TK series, popular PM VSD EPM series, energy-saving PM-Ⅱ series, LPM-Ⅱ series，and LPM series, unique LS series in trend. We are your best cooperative partner.