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7.5 Compressor Oil

Compressor Oils

Compressor oils include Air Compressor Oils, Gas Compressor Oils and Refrigeration Compressor Oils
 
The table below shows the key test parameters for Viscosity, Water, Insolubles and TAN.

Compressor oil

Key Test Parameters Oil Condition Default Limit Comment
Viscosity (cSt at 40°C) Satisfactory < +/- 15% A viscosity increase is more common than decrease. It should be noted and checked at more frequent intervals. Check that the correct grade of oil is used for top-up.
  Borderline nom >15-20%  
Water (%) Satisfactory 0.05% - 0.10% Water can enter the oil via the compressor cylinders; always check that inter-cooler drains are operated effectively. Refrigeration oils cannot tolerate water at all.
  Exceeds limit > 0.10%  
Insolubles (%) Exceeds limit > 0.10% Formed by carbon from oxidised oil, high insolubles will rapidly foul air delivery valves.
TAN (mg.KOH) Exceeds limit Change of 1.0 TAN TAN should always be monitored by trend as the TAN of some oils can fall from new then rise again as the oil ages.
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