What causes air compressor oil contamination?

1 Oil ingress

One of the main causes of oil contamination is oil ingress, which means that oil enters the compressed air system from external sources. This can happen due to leaks, spills, or improper connections in the oil supply lines, filters, or lubricators. Oil ingress can also occur if the air intake is located near an oil-contaminated area, such as a workshop, a garage, or a road. To prevent oil ingress, you should regularly inspect and maintain the oil supply lines, filters, and lubricators, and ensure that they are properly sealed and aligned. You should also place the air intake away from any potential sources of oil contamination and install a coalescing filter to remove any oil droplets from the incoming air.

2 Oil carryover

Another cause of oil contamination is oil carryover, which means that oil passes through the compressor and enters the compressed air system. This can happen due to excessive oil consumption, inadequate oil separation, or high operating temperatures. Oil carryover can affect the performance and quality of the compressed air and cause problems such as fouling, corrosion, or fire hazards. To prevent oil carryover, you should check and adjust the oil level, pressure, and viscosity according to the manufacturer's specifications. You should also use a high-quality oil separator and install a condensate drain to remove any oil residue from the compressed air.

3 Oil degradation

A third cause of oil contamination is oil degradation, which means that oil breaks down due to chemical or physical factors. This can happen due to oxidation, thermal stress, moisture, or contamination by dirt, dust, or metal particles. Oil degradation can reduce the lubrication and cooling properties of the oil and produce harmful by-products such as acids, sludge, or varnish. These by-products can cause wear and tear, clogging, or corrosion in the compressor components and affect the air quality and safety. To prevent oil degradation, you should use a synthetic oil that has a longer service life and better resistance to oxidation and thermal stress. You should also monitor and change the oil regularly and use a filter to remove any contaminants from the oil.

4 Oil migration

A fourth cause of oil contamination is oil migration, which means that oil moves from one part of the compressor to another due to pressure differences or gravity. This can happen due to faulty valves, seals, or gaskets, or improper installation or orientation of the compressor. Oil migration can cause uneven distribution of oil in the compressor and affect the lubrication and cooling functions. It can also cause oil leakage or overflow in the compressor or the compressed air system. To prevent oil migration, you should ensure that the valves, seals, and gaskets are in good condition and replaced when needed. You should also follow the manufacturer's instructions for installing and positioning the compressor and avoid tilting or shaking it.

5 Oil mist

A fifth cause of oil contamination is oil mist, which means that oil is aerosolized and dispersed in the air due to turbulence or friction. This can happen due to high air velocity, low oil viscosity, or small oil droplets. Oil mist can reduce the visibility and air quality in the compressor environment and pose health and safety risks for the workers and the equipment. It can also cause deposits or stains on the surfaces or objects near the compressor. To prevent oil mist, you should use a low-noise and low-emission compressor that has a smooth and efficient airflow. You should also use an oil mist eliminator or a venting system to capture and remove any oil mist from the air.

6 Here’s what else to consider

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