Filter tests dirt capacity test

Membrane filters Down to submicrometre sizes Low mechanical strength and poor dirt capacity. Main use is for extreme cleaning of test rigs, etc., or oil reclaiming. 

If laboratory tests using a disc of the filter membrane indicate that the filter will have insufficient throughput or life then prefiltration ould be considered. Ideally both filters should come to the end of their service life together, i.e. the dirt holding capacity of both filters should be exhausted at the same time. This enables both filters to be replaced together. A duplex system switching over both prefilter and fine filter is available. 

There are a wide range of liquid filters used in industries, especially in the filtration of fuel, lubricants, and water. Oil filters are required to compliance with international contamination code of cleanliness for the fluid contamination levels (ISO 4406) and corresponding filtration standards (eg, ASTM D3948-14). The required filtration efficiency and dirt holding capacity for the removal of solid particles, water droplets, and water moisture from oil fuel/lubricants depend on the filtration system used, the required cleanliness levels of the oil, and the oil properties (eg, viscosity and surface tension), which influence the fibre wetting process in liquid filtration. Examples of the standards defining the performance requirements and testing methods for fuel and lubricant filtrations are as follows. 

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