2026-06-11Views：
The conclusion is that the oil in the pipeline of the oil-injected air compressor generally takes tens to hundreds of hours to be basically cleaned, while there will be no oil in the pipeline of the water-lubricated oil-free air compressor, only the problem of water needs to be dealt.
Let's start with the traditional fuel injection air compressor. When the new machine is installed and turned on for the first time, some oil mist will remain in the pipeline, which is normal. Because the oil and gas separator inside the machine needs a running-in process, the separation effect is not so thorough at first, and some oil will follow the gas into the pipeline. Generally, after 50 to 150 hours of operation, the oil content will be significantly reduced. However, to be completely clean depends on the state of the oil and gas separation core. It is usually recommended to check it every 1,000 to 2,000 hours, and it should be changed after about 4,000 to 8,000 hours.
Then water lubricated oil-free air compressor. When this kind of machine works, water is used instead of oil for lubrication and sealing. During the compression process, water participates in to help cool down and fill the gap, but the discharged gas does not contain oil, so there is no problem of oil residue in the pipeline. You don't have to worry about the pipes getting greasy. However, the water will come out with the gas, and there will be water vapor in the pipeline, which needs to be treated separately. According to the need to add a dryer to remove the remaining water vapor on the line.
To sum up, it takes tens to hundreds of hours for the oil injection machine pipeline to clear the oil, and regular maintenance is required in the follow-up. There is no oil in the water-lubricated oil-free pipeline. It is only necessary to solve the water problem.
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