3.4 Filtration and Conditioning

Describe the purpose of fluid in a fluid power system.

Define contaminant. Identify sources of contaminants and give examples.

Describe how oil can become a contaminant.

Describe the negative effects of contaminants in a fluid power system.

Describe the unit commonly used to measure contaminants.

Describe methods of reducing contaminant entry into a system.

Define a filter and describe a filter’s construction.

Define and differentiate between the terms nominal and absolute rating for a filter.

Define a strainer and differentiate between strainers and filters. Describe common strainer locations. Describe mesh count.

Describe a clogged filter bypass and indicator

Define beta ratio.

Calculate the beta ratio for a filter that has 1000 particles greater than 10µm upstream and 10 particles greater than 10µm downstream.

List different filter locations. Discuss the pressure requirements and describe their operation.

Describe why filters are ordinarily unidirectional. Draw an arrangement of check valves that ensures unidirectional flow through a filter given a bidirectional flow path.

Describe the additional function of a kidney loop/offline filter with respect to viscosity.

List the 3 particle sizes of concern for the ISO Standard 4406:1999.

Determine the particle count for an oil with an 18/16/13 cleanliness rating

Discuss why cleanliness standards must be considered for different applications.
Describe conditioning and differentiate between it and filtration.

Describe tube in shell and baffle heat exchangers employing liquid heat transfer fluids and comment on the purpose of counter flow.
Comment on the purpose of a reservoir and how it is used to passively condition fluid.