Appendix F
Hydraulic System Target Cleanliness Levels
51
Hydraulic System Target
Cleanliness Levels
Where a hydraulic system user has been able to check cleanliness levels over
a considerable period, the acceptability, or otherwise, of those levels can be
verified. Thus if no failures have occurred, the average level measured may
well be one which could be made a bench mark. However, such a level may
have to be modified if the conditions change, or if specific contaminant-sen-
sitive components are added to the system. The demand for greater reliability
may also necessitate an improved cleanliness level.
The level of acceptability depends on three features:
•
the contamination sensitivity of the components
•
the operational conditions of the system
•
the required reliability and life expectancy
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