J. Phil Thien's Projects

Has anyone done a top hat with a six inch to the blower and four inch to the equipment? I would like six  inch everywhere but may have to use a tapered reducer at the seperator for a while

Is it possible to have too much filter area on a standard DC? I want to upgrade from the original 1 micron bag that shipped with my DC (PSI 2 HP 1500 cfm).  Wynn filters range fro 100 to 274 SF. PSI offers nano filters for their cyclones that have 350 and 226 SF at roughly the same cost. I'm not sure if the low resistance would do any damage to the motor or what the point of diminishing returns are.

Quote from: phil (admin) on January 13, 2012, 07:13:41 AM

Quote from: GMan on January 12, 2012, 07:21:06 PM
I haven't been able to find any specific recommendations on tophat diameter based upon CFM or pipe size, so any pointers there would be much appreciated.

As D increases, fine separation performance improves.  The problem you run into with too small a D is that the air mass doesn't slow enough by the time it makes a full revolution.  When it comes around and hits the incoming air, the super-fines can be pushed towards the center, where they exit the outlet pipe.

If you're worried about fines getting into a filter, then a larger D will help.  If you're exhausting outside, it is moot.  Either the 19.5" ring of your DC, or a larger shop-made unit, will exhaust minimal fines (they won't accumulate, you won't see any evidence of dust outside).

By "D" are you meaning the diameter of the vessel or the distance from baffle to actual lid. I'm using a five inch distance with a 19.5 inch diameter and four inch ports. Still get alot more fines than I'd really like in my filter bag( 1 micron)