CAT filtration studies

Collecting, filtering and dewatering of WVO SVO vegetable oil. For Biodiesel producers too.

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CAT filtration studies

Postby SunWizard » Wed Mar 05, 2008 1:42 pm

CAT recently did major studies of contaminant particle size in fuel and wear problems resulting. As a result they switched to 2 micron (absolute) filters, after their research determined 5-7 micron particles were the most abrasive.

Realize if you are filtering to 10 micron (nominal) that a large amount of particles greater than 10 microns can make it past. An absolute filter rating means 98.7% efficiency. A nominal rated filter without an efficiency rating (such as 70% of the particles down to 10 microns) is basically meaningless. A screen door could be considered a 10 micron filter, it will catch a 10 micron particle, once in a while.

If you have an older mechanical in-line injection its not as big a problem, unless you don't know the efficiency rating of your 10 micron filter. This applys both to your at home filtration, and the ones on your vehicle.

Also realize at home and in the vehicle we are running most of the filters at way beyond their designed and tested temperature and pressures, so the micron ratings may be way off.

Here are some good articles on it:
Truckings Dirty Little Secret

The conclusion, Part II
YVORMV - Your veg. oil results may vary.
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0.5 micron final filter

Postby ecojetta » Sat Mar 15, 2008 10:12 am

This was a helpful article.

My current setup filters down to 5 microns with multiple passes increasing
the statistics of the filter. Then I dewater (still learning the ropes on this),
and filter one final pass with a 2 micron Permacool and then a 0.5 micron filter. I am still developing this setup so any feeedback is welcome.
The point is that the 0.5 micron filter will probably get the last of the 5 micron particles that made it through. I am definitely NOT claiming that the oil is "filtered to 0.5 microns" like production veggie oil on the store shelf.
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