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quote:Originally posted by Luis Velasco:
Hymat,
This is not a very accurate method, however it will give you some thougs.
1. fill a new unused filter with the same oil the equipment is using
2. Let the filter drain during a fix time period and weight it
3. Take the used filter out of the equipmente and let them drain for the same period of time. Then weight it.
Once again is just a field unacurate estimation.
quote:Originally posted by d1pae:
Dave @ Hymat,
I do not know what type of contaminant you are stopping with your filter but there is no way of accurately determining “Dirt Holding Capacity” from a used element. If you use a method like dipping the element into oil for a set time and then drying it for a set time, you must be able to accept a very low degree of accuracy because each time the contaminated filter is flooded with oil, you will be removing some of the contaminant that had caused it to reach its’ terminal, or change-out, pressure. You can demonstrate this to your self by re-installing a “plugged” filter after it has been removed from the system and seeing how much more time you can get on the used filter before the filter needs to be changed. Also, you must realize that much of the filters’ “plugging” is due to the filter stopping extremely small particles, those that you probably cannot visibly see; you may not see these particles as they are getting washed off of the filter.
The dirt holding capacity that the filter manufacturer is referring to is as a direct result of multiple “Multi-Pass” tests per ISO 16889, using a tightly controlled type of contamination with a tightly controlled particle size distribution administered in a tightly controlled fashion using Mil-Spec oil at a tightly controlled viscosity. Unfortunately a filters’ dirt holding capacity is a function of the contaminant being caught, the contaminants particle size distribution, the oils’ viscosity range, the oils’ purity (with respect to other fluids in the mix) as well as cyclic oil flow conditions.
A filter that works well with one particle size distribution and dirt concentration will not necessarily work well with another particle size distribution / concentration. The same is true about changes in oil viscosity; performance with low viscosity oil to the performance with high viscosity oil. Nothing is linear in filtration…
Doug
