Typical Fluid Cleanliness Level
Requir ements
Many manufacturers of hydraulic components
have established uid cleanliness levels for their
components . Using a portable lter cart can be a very
eective way to reach and maintain these cleanliness
levels.
Filter Cart Performance
Fluid cleanliness levels are a function of initial
contamination levels, contamination ingression rates,
reservoir size and lter element eciency. e chart
below lists approximate time requirements to achieve
certain cleanliness levels based on the assumptions
noted.
Notes:
The results in the chart are based on the following assumption:
Initial contamination level is 500,000 particles greater than1.
10 micrometers per 100 ml of fluid (10MFP cart).
Inlet filter fitted with 40SA element; outlet with 20Q element.2.
System ingression rate equal to 1 X 103.
6
particles greater
than 10 micrometers entering the system per minute.
Reservoir Time Projected
Capacity Required Cleanliness
(Litres) (Hours) Level (ISO)
190 0.5 20/18/15
190 1.0 17/15/12
190 2.5 16/14/11
378 1.5 18/16/13
378 2.5 17/15/12
378 4.0 16/14/11
757 2.5 19/17/14
757 3.5 18/16/13
757 5.0 17/15/12
Component ISO Cleanliness Level
Servo control valves 16/14/11
Proportional valves 17/15/12
Vane and piston
pumps/motors 18/16/13
Directional and pressure
control valves 18/16/13
Gear pumps/motors 19/17/14
Flow control valves
cylinders 20/18/15
New fluid 20/18/15
Filter Cart Element
Performance
Media Filter Capacity
Code Media (Grams)
40W Woven Wire *
40SA Synthetic *
20Q Microglass III 140
10Q Microglass III 135
05Q Microglass III 130
02Q Microglass III 110
Notes: Multipass test run @ 80 gpm to 50 psid terminal - 5 mg/l BUGL.
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