Air Lubricators generally use a venturi effect to produce very fine mist (almost like smoke) of liquid oil which is picked up with the demand air flow and carried downstream. The finer the droplets the further it can be carried. Turbulence in the valve or cylinder causes the mist to recombine into larger useful droplets. Air turbulence at other locations can cause the mist to recombine too soon. Low spots in airlines after the lubricator should be avoided because of liquid oil laying in that spot.
Lubricator operation can be affected by water in the air, weight of the oil, piping configuration, length of the line and more.
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