Answer: First, assume that the exhaust oil content of the air compressor is 5ppm.
Under standard conditions, 1 atmosphere, temperature 273K, the weight of 1m³ air is 1.276kg.
Then the oil content per cubic meter
5/1000000*1.276kg/m³=6.38kg*10-6/m³=6.38kg/m³
That is, the oil content per cubic meter is 6.38mg.
Then the oil consumption of the air compressor per minute
6.38mg/m³*21.1m³/min=134.62mg
Oil consumption per hour
134.62mg*60=8077.20mg
Based on 24h work per day
8077.20mg*24=193852080mg
Based on 25 days of work per month, the monthly lubricant consumption
193852.80mg*25=4846.3g=4.85kg
Conclusion: Based on 5ppm oil content, the monthly oil consumption of an 21.1m³/min air compressor unit with a displacement of: is 4.85kg.
