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Appendix A
Measuring Water Content 63
Measuring Water in Hydraulic
and Lubricating Fluids
From North Notts Fluid Power Centre
In mineral oils and non aqueous fire resistant fluids water is undesirable. Mineral
oil usually has a water content of 50-300 ppm which it can support without adverse
consequences.
Once the water content exceeds about 500ppm the oil starts to appear hazy. Above
this level there is a danger of free water accumulating in the system in areas of low
flow. This can lead to corrosion and accelerated wear. Similarly, fire resistant fluids
have a natural water content which may be different to mineral oils.
Saturation Levels
Since the effects of free (also emulsi-
fied) water is more harmful than those
of dissolved water, water levels should
remain well below the saturation point.
However, even water in solution can cause
damage and therefore every reasonable
effort should be made to keep satura-
tion levels as low as possible. There
is no such thing as too little water. As
a guideline, we recommend maintain-
ing saturation levels below 50% in all
equipment.
100%
75%
50%
0%
25%
Emulsified
Saturation point
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