To conduct a complete engine life test is a very expensive venture. What is used instead is the multipass test. Basically the filters are hooked up to a test stand and 6606 aviation hydraulic fluid is ran through them. 6606 is the standard test fluid. Then, basically a "puff" of test dust is added to the flow of a known particle distribution. A particle counter down stream analyzes the distribution of particles that gets through the filter. The filter is then subject to a series of these cycles (hence multipass). There is a single pass test, but it isn't quite as realistic. You'd be surprised how accurate the test is. If the threads on the tap plate of the filter are not formed right, you will see that leakage in the results.
So, the short answer is that standard tests have been created to normalize data collected from one filter to the next.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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