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A good example of this is manufacturing of automotive catalytic converters which fills an ambient area with a high concentration of very small fines. Today, most units use dry filter cellulose paper, however on large units with relatively stable inlet flows there still may be oil wetted screen filters in use.Ī major, not so obvious problem with compressor inlet air is not the visible high dust, but rather when the inlet air ambient area has very small fines (<3 microns smaller) which pass through the standard filters. When high dust applications are encountered such as corrugator plants, mineral processing, etc., the high dust will usually be quite visible and a multi-stage high dust version of the inlet filter is used which usually includes a pre-cleaning area where the heavier dust loads fall out and are removed before they get to the main filter element. Normal life of these elements is expected to be two months to six months. The compressor OEM installs an inlet air filter (Figure 1) usually rated for “standard conditions” which most often means 99% removal of all particulate 5-micron and larger, and 95% removal of all particulate 3-micron and larger. Just as many ambient air issues with regard to the actual equipment operating environment are created by personnel and can be corrected by personnel, inlet air contamination is always created by humans and there is almost always a correction that will either eliminate the issue or mitigate the effect.Īirborne particles are usually a very straightforward contaminant that is often ignored.
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Product contamination cannot only lead to expensive scrap levels but even worse, very expensive recalls. Line speeds and productivity continue to accelerate anything that stops production or significantly slows it down can have very expensive aftereffects. As production machinery and processes continue to evolve more, and more industries are requiring cleaner and drier air for both machinery reliability and product integrity.