Page 11 - Parker - The Handbook of Hydraulic Filtration

Contamination Types and Sources

Effect Of Water In Oil On Bearing Life

250 0.0025% = 25 ppm

200
% Bearing Life Remaining 150 0.05% = 500 ppm
=
0.01%
100 ppm
=
0.10%
1000 ppm
0.15%
=
1500 ppm
=
0.25%
2500 ppm
0.50%
=
5000 ppm
100
50

0
0.0025 0.01 0.05 0.10 0.15 0.25 0.50
% Water In Oil

Effect of water in oil on bearing life (based on 100% life at .01% water in oil.)
Reference: ”Machine Design” July 86, ”How Dirt And Water Effect Bearing Life” by Timken Bearing Co.

Sources Fluids are constantly exposed to water Water can enter a system through worn

▼ Worn actuator seals and water vapor while being handled cylinder or actuator seals or through
and stored. For instance, outdoor stor- reservoir openings. Condensation is
▼ Reservoir opening leakage
age of tanks and drums is common. also a prime water source. As the fluids
▼ Condensation
Water may settle on top of fluid con- cool in a reservoir or tank, water vapor
▼ Heat exchanger leakage tainers and be drawn into the contain- will condense on the inside surfaces,

er during temperature changes. Water causing rust or other corrosion
may also be introduced when opening problems.
or filling these containers.

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