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Fuel transfer/polishing pump
Please appreciate that I dont want to appear to be an arrogant
know-it-all after being in on and aroud critical filtration/separation most of mworking life ... and yet give just enough information that each can take and arrive a result that is based on current or state-of-the-art results. ANY filter media (including compressed pubic hair) thats used in a recirculation polishing system will work ... its all a matter of degree. Whats wrong with TP, etc. is that the material used to filter is not bonded, can digest (make more particles) in the presence of water --- thus to do the exact opposite of what you are trying to do. If doesnt matter if rust, bacteria or broken up toilet paper fibers blocks the final filter to your engine... expecially during an emergency. Unbonded cellulose is notorious for unloading particles or allowing the particles to migrate through the filter .... OK if the main system is not drawing fuel thats OK as the recirculating slurry will probably be recaptured; but, if all hell breaks loose and you have a high fuel demand at the time when the TP decides to unload itself or its already trapped debris .... the whole system can catastrophically fail .... My objection to TP - very poor efficiency, migrates particles, migrates fibers, unloads at increasing differential pressure, larger first cost due to need for larger diameter housing, no constancy of retention, knife edge seals of 'cartridge' - very limited in retention and VERY prone to bypass. Short life due to low surface area. TP will ' deform' - wrinkle into a smaller mass when heavily laden and differential pressure is high (remember those knife edge seals) then unload and bypass. As far as experience ..... the high tech/high purity industry used such devices for many years: loose fiberglass, Kotex pads, string wound cylinders, TP, chopped cellulose ....... until after WWII the world started using captured German technology: membranes, cartridges, etc. If TP were any good, industry would still be using it. The last such system I personally replaced/upgraded was in the mid 70s. ..... as a cost cutting measure!!!!! DO NOT depend on filters to remove the crud in your system. If they plug it means that you are contaminated and need to clean your fuel system. Such plugging clearly indicates a **symptom**, the filters prevented the symptom from becoming an extremis situation. If your system is plugging filters, they did do their job as they are supposed to .... but now go back in and clean the system! Resident particles form and agglomerate into more particles. Bacterial scums feed other bacteria, etc. Your symptoms of plugging filters means your system is contaminated.... a filtration system is a band-aid or a 'condom' to prevent stoppage. Consider to thoroughly mechanically CLEAN the tank. ;-) In article , Steven Shelikoff wrote: Rich, I appreciate that you seem to be an expert on filtering theory even though you also seem to lack the practical experience of actually using the TP or PT depth filters we're talking about. I realize you don't think they work. Even so, I'd love to hear your expert opinion (absolutely no sarcasm intened) on why my Racor 2uM filter has lasted so long (2 years now and still not clogged) after installing a TP prefilter when I completely clogged two of the same filters in 20 minutes each before installing the TP prefilter. Steve |
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