Page 9 - Parker - The Handbook of Hydraulic Filtration
P. 9
Contamination Types and Sources
Water
Contamination
Types
There is more to proper fluid
maintenance than just removing Typical Saturation Points
particulate matter. Water is virtually a
universal contaminant, and just like Fluid Type PPM %
solid particle contaminants, must be
Hydraulic Fluid 300 .03%
removed from operating fluids. Water
can be either in a dissolved state or in
a “free” state. Free, or emulsified, Lubrication Fluid 400 .04%
water is defined as the water above the
saturation point of a specific fluid. At Transformer Fluid 50 .005%
this point, the fluid cannot dissolve or
hold any more water. Free water is
generally noticeable as a “milky”
discoloration of the fluid.
Visual Effects Of Water In Oil
1000 ppm 300 ppm
(.10%) (.03%)
50 PPM 2000 PPM
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