Options for Removing Water in Oil

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Options for Removing Water in Oil
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• Water, water, everywhere . . . Water is ever
  present in the environment. Unless you live in an
  arid region, it is a fundamental fact of life.
  Water co-exists in oil in essentially the same
  way it co-exists in the atmosphere.

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• It starts off in the dissolved phase - dispersed
  molecule-by-molecule throughout the oil. Just
  like water present in the air, it cannot be seen
  in oil, which may appear clear and bright.
  However, once the saturation point is exceeded,
  water is typically present in the emulsified
  phase creating a milkiness or fog in the oil,
  just like moist air on a cool day.

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• When sufficient water exists, or when the oil has
  adequate demulsibility, free water will collect.
  Because water is typically heavier than oil, it
  settles below the oil, at the bottom of sumps and
  reservoirs.

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• The point at which an oil contains the maximum
  amount of dissolved water is termed the
  saturation point. The saturation point is
  dependent on the oils temperature, age and
  additive composition.

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• The higher the temperature, the higher the
  saturation point and hence more water held in
  solution, in the dissolved phase.

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• This is the same as being able to dissolve more
  sugar in hot water, than in cold water.
  Similarly, the older the oil, the higher the
  level of water that can be dissolved.

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• This is due to polar by-products of oxidation in
  the oil, which act as hooks holding on to the
  water molecules and keeping them in solution.

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• Likewise, highly additized oils, like crankcase
  oils, have a higher saturation point than lightly
  additized oils like turbine oils, because the
  additives - many of which are polar - also hold
  the water in solution.

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