Oil Free Compressors

[LubeOiler]

I bought a 22 gal. Compressor that is oil free. I just wondered how heat can be disapated on a compressor without oil anyway. They make both types with and without oil. Does this mean the compressor will run just as long with the lube they supply during assembly.I hope so and would like a few answers which is better or equal.

 

[tom slick]

often the piston is made of some type of graphite or plastic composite of some type. that is why it doesn't need oil.

 

[McKittrick]

Probably has teflon rings, we have some reciprocating compressors here that are oil free, they last about 6 to 9 months before needing an overhaul. 25 hp and run 24x7.

We now have rotary screw oil free compressors to replace the reciprocating ones.

 

[ewetho]

In the Navy we hand 6 stage 3000 PSI 30 CuFt/Min oil free compressors that used bronze infused silicon rings. Cooler between stages to allow the seal to not over heat and cooling flow around the wet-sleeves too.

 

[1040 WreckerMan]

I don't have much knowledge on air compressors, the biggest thing I've any experience with are the 50hp rotaries we run at work. I've worked on some big HP diesel driven air compressors, but mostly just PM on the compressors, but a lot of work on diesel power units. With the stuff I've worked with I find that oiled compressors tend to last longer, but that will probably change as materials advance. Most homeowner type usages won't see any difference in LTO I don't think. In some applications oil free compressors have advantages such as in coating process like automotive and industrial painting.

 

[bmwtechguy]

Oil-free compressors for the homeonwner are typically direct drive and rather loud and obnoxious while running. Some of the newer designs are better now. My personal experience has been that the oil-free designs can last as long as a comparable oiled, direct drive compressor. Neither of these direct drive (high rpm/loud) types is designed for heavy, continuous use, but will do fine for the average homeowner's compressed air needs and last many years with this type of use. To go up a step in quality, I believe you would need to get a lower rpm, twin cylinder, belt driven air compressor. These are usually rated for continous use (100% duty cycle), and you will able to carry on a conversation next to it while it is running. This has been my personal experience.