This solution is often referred to as “technically oil-free air”. However, even under optimum conditions and with several stages of oil removal, the air quality with regard to oil is suspect. To achieve even barely acceptable air quality with oil-injected compressors, it is necessary to have air-cooling devices and several stages of oil removal with multiple components. A failure of any of these components or inadequate maintenance can result in oil contamination of a process. With oil-injected compressors, there will always be a risk of contamination and the possibility of severe consequences for the business.