Recently, Green Globe Services was approached by Camfil Farr to be a dealer for their dust collector line. My initial reaction that we needed to take on another dust collector line like we needed "another hole in the head." There are so many imitators of these basic styles that there is a high degree of "sameness" with dust collectors. However, Richard Kapcha, of Camfil Farr told me their company had grown around 600% in the recent years, contrary to our experience with the majority of other dust collector manufacturers, experiencing flat growth. Immediately I was impressed. I wondered, "What are they doing different!?" Turns out the Camfil Farr crew took a close look at a bunch of the issues you typically run into with dust collection and did something about them with unique design features. In the market of dust collectors, you essentially have a bag-and-cage style pulse jets with either 4 1/2" dia Mikropul style bags or nominal 6" diameter Flex Kleen style-either spring band seal or clamp on bags. The other prevalent styles include the Donaldson Torit style cartridges which are completely or nearly horizontal.
Another trend we had seen over the years with dust collector companies- Watch out for the companies that don't fabricate in house. Many baghouse manufacturers, pushed by the pressure to maintain a steady work flow in their shop in the face of dwindling sales PLUS the pressure to lower their sell price, have opted to subcontract to lowest bid contractors around the country to remain viable and reduce freight costs by manufacturing regionally. As a buyer of dust collectors, when we've bought contract fabricated units, the pain and expense of correcting quality problems cost far more than the savings we thought we were getting at the time of purchase.
The cleaning systems on cartridge dust collectors all use a pulse jet cleaning system that leaves a lot to be desired. REASON: Pulse jet / venturi originally was used in bag-and-cage style collectors to send a bubble of air down the inside of a FLEXIBLE bag to clean it. The shock wave cause a traveling ripple down the FLEXIBLE bag causing filter cake to momentarily separate from the bag and shift down the bag with each pulse until falling off into the hopper.
Two major problems with cartridges:
They are rigid and NOT FLEXIBLE so the force to dislodge the cake is not the same. On a flexible bag, it's not so much the reversing of the air flow with a pulse that cleans the filter, its the ripple of the shock wave.
Problem with cartridges is they use a similar pulsing mechanism which only creates a marginal reversing force the clean the cartridge
Second issue is the pleats are so close together- sometimes touching-trapping dust making it almost impossible to clean.
What the guys at Camfil Farr have done:
They looked what it takes to clean a cartridge. just take an air hose and shoot air PERPENDICULAR to the surface and watch how well it cleans.
Keep the filter media pleats from touching
Put a cone shaped cartridge on the underside of the cartridge to increase filter area
Put a dome on top of the inside cone to deflect the pulsing air PERPENDICULAR to the filter surface.