Why do I Have Water in My Compressed Air Line?

When air is compressed to approximately 1/7 of it atmospheric volume (for 100 PSIG applications), there is a rise in temperature during the compression phase. This temperature rise allows water vapor in the air to be held in suspension during the compression stage. As a general rule of thumb, air will hold almost double the amount of water vapor in suspension with every 20ºF in temperature rise. This temperature rise is normally anywhere from 170 to 400ºF (76 – 205ºC) depending upon the type of air compressor being used. After compression, the air will cool as it travels through piping, air receivers, and other devices. As the air cools, at some temperature level, (dependent upon the relative humidity of the air at the compressor intake), it will reach its saturation level (100% RH), and further temperature reduction past that point will result in condensate forming in the air line. Most … Read the rest