Why is Filtration Important?
The Chain Reaction of Wear
Particles generated as a result of abrasive wear are work hardened; thus they become harder than the parent surface. If these particles are not removed by proper filtration, they will recirculate and cause additional wear. This "chain reaction of wear" will continue and result in premature system component failure unless high-performance filtration is applied to break the chain.
Pall Ultipor III ® filters with ß x= 1000 removal efficiency ensure cleaner fluids for long component life, maximum system reliability, and lower operating costs.
View Chain Reaction of Wear and Wear Mechanisms Video
Particles enter the clearance space between a component's two moving surfaces, bury themselves in one of the surfaces, and act like cutting tools to remove material from the opposing surface. The particle sizes causing the most damage are those equal to and slightly larger than the clearance space. Ultimately, abrasive wear will result in dimensional changes, leakage and lower efficiency. Left uncontrolled, more particles will be generated which will result in a chain reaction of abrasive wear -- a chain reaction that will continue and cause premature system component failure unless adequate filtration is implemented to break the chain. To protect components from abrasive wear, particles of approximately the dynamic clearance size range must be removed.
Excessive load, low speed, and/or reduction in fluid viscosity can reduce oil film thickness to a point where metal-to-metal contact occurs. Surface asperities are "cold welded" together and particles are sheared off as surfaces move.
Water and Air Contamination in Oil
Dissolved air and other gases in oils can cause foaming, slow system response with erratic action, a reduction in system stiffness, higher fluid temperatures, pump damage due to cavitation, an inability to develop full system pressure, and an acceleration of oxidation.
Control Contamination With Pall Oil Purification Systems.
Measuring Filter Performance - The Multi-Pass Performance Test
The multi-pass filter performance test is internationally recognized as the most reliable means to obtain consistent and repeatable information on a filter's ability to control specific-sized particles.
The multi-pass 'beta' (ß) test challenges the filter in a similar manner as an operating system would!
- Fresh contaminant is introduced in a slurry form into the test reservoir, mixed with the fluid in the reservoir, and pumped through the test filter
- Contaminant not captured by the filter is returned to the reservoir for another pass through the filter (thus the name "multi-pass")
- Upstream and downstream fluid samples are analyzed to determine their respective particle counts