![]() If allowed to run too hot, thermal expansion can result in increased rates of seal wear. Some oil-free compressors will go longer, depending on the design and type of sealing material used.Ī particular issue is temperature. For many compressors, this can be between 2,000 and 8,000 hours of operation, depending on how the equipment is used. ![]() However, the seals will wear and eventually need replacement. Providing an oil-free compressor is maintained in accordance with the manufacturer’s recommendations, it should run trouble-free for a long time. Always ensure external surfaces, especially fins, are kept clean for efficient heat radiation and conduction. In addition, bearings will need greasing, if the compressor is designed that way.įurthermore, as oil-free compressors have no oil to take away the heat of compression, thermal protection takes on greater importance. However, and this is a critical point, any gearbox and driving engine will still be lubricated and that will need periodic maintenance. In addition, the oil separator is eliminated. The principal difference between oil-free and oil-injected compressor maintenance is that the former has no oil to check and replace. In both designs, these materials seal and lubricate motion, although there is nothing to take away heat. Rotary screw compressors have special sealing elements or materials applied to the screw tips. Reciprocating compressors, use PTFE (Teflon) seals between piston and bore. Achieving this means the piston or screws need a different means of sealing and lubrication. What it means is that no oil is introduced into the air compression chamber. The oil-free designation does not mean the compressor runs without lubricating oil. Arguably, compressed air can be filtered to the required purity, but many compressor purchasers in these industries prefer to buy a compressor that has been designed so it will not put oil into the air. Food and beverage and medical industries are the main examples. In some industries, it is essential that compressed air used in production is completely free of contaminants. This may sometimes appear as a buildup on the exhaust ports of air-powered tools and equipment. A separator after the compressor pulls out most of this oil, leaving a very small amount that is carried into the air distribution network. In addition, it provides lubrication and takes away heat.Īs air moves through the compressor some of this oil becomes entrained. Its main function is to seal the gap between the piston ring and cylinder wall or screw tips and housing. In both of these designs, oil is injected into the compression chamber. In a rotary screw design, compression is performed by a meshed pair of helical screws that suck air in and squeeze it into a reducing volume. Air is drawn in on the downstroke and compressed on the upstroke. In a piston compressor, also called a reciprocating compressor, a piston moves up and down in a cylinder. How Oil Gets Into Compressed AirĮvery air compressor is a pump, the two most common types being piston and rotary screw. First, though, it is important to be clear about what “oil-free” means and why it can be important. Here we’ll discuss the maintenance and repairs needed by oil-free compressors, and how this differs from oil-injected designs. What’s more, while oil-free compressors may need less frequent attention it might be argued that they need overhauling more often. While there are differences in what oil-free and oil-injected compressors need, neither type will provide reliable operation with no maintenance at all. More wonderful scenery is waiting for you to find.One of the benefits touted for oil-free air compressors is reduced maintenance. Thanks to the Art Project, you can visit The Palace of Versailles, stroll around the White House and enjoy the National Museum of Tokyo. You are welcome to visit the world's famous scenic spots. Looking for a place to eat? It's all in Google Maps: browse nearby restaurants, find one you like, check out the dining environment, and even make reservations. The wonderful world is all around you, waiting for you to discover. Or even better, join a local guide program to share your favorite stores. Torn between two businesses? You can start by looking at comments and photos shared by locals to make a more informed decision. You can see everything from the highest peak to the lowest canyon. If a map is no longer just a map, what is it? It’s a trip to the moon, a ticket to Mars, a bird's eye view of the Earth. Revisit the world around you in ways you've never seen before With street view and indoor maps, you can take a peek before you go in person. See 'Perspective' the internal environment of the stores
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