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Sandblasting Filtration Techniques

Sandblasting Filtration Techniques

Sandblasting Filtration Techniques

(OP)
Does anyone have any suggestions for me?      

The company I work for is going to sandblast two very large floors in a building we recently purchased.  I am looking for some cheap and easy design solutions that will help me to filter the air during the sandblasting operation.  We currently own a large number of Torit Cyclones and a wide assortmant of high cfm fans.  I am interested if anyone else has any ideas on how to control the air flow in a dusty environment.  We cannot just blow the dust outside, of course and must pull it down somehow out of the air.  Keep in mind we do not have a budget to purchase new equipment.  Does anyone have good experience with any particular filter medium?  Also, any ideas on how to seal and convert rooms adjacent into these areas into a large-scale cyclone/filtration unit using the aforementioned requirements?  Thanks.

RE: Sandblasting Filtration Techniques

If you have cyclones and blowers. You could use tarpaulins to enclose the blasting area then draw from there.
 Depending upon how fine the resulting dust is you may need a volute on the cyclone to catch the fines or a secondary bag. A system that works quite well if you have enough water gauge is to run the exhaust into a 55 gallon drum with water in it so that it bubbles through the water.
This takes the fines out of the air quite well.However you now have the probem of getting rid of the contaminated water.
B.E.

RE: Sandblasting Filtration Techniques

One thing I did not mention in my first reply.
 Ohsa does not allow air that contains silica dust to be recirculated in a building where people may breathe it.
B.E.

RE: Sandblasting Filtration Techniques

A uk Company called Blastrac make a machine for floor blasting - -like a ginormous Hoover - - -it blasts and sucks and filters all at same time - - used for cleaning decks on aircraft carriers, etccan be hired or bought.Sounds like this is what you need.       DW

RE: Sandblasting Filtration Techniques

If you utilize the adjacent rooms you can most definately filter the air there, keep in mind that silcates, dust whatever will setle (due to gravity) when the velocity of air drops below thier specific gravity/surface area resistance. Lot of physics calulations to determine what the speed of air flow required to keep particulates afloat is. Anyways. Use the cyclones to suck the air from the sandblast area through the adjacent room. Use the adjacent room as an "air box" where the high cfm in the small tube drops into the room it will obviously slow down due to the air volume. A couple of baffles made out of steel wool or the like will colect the particulates effectively if the air flow through them is slow enough.

RE: Sandblasting Filtration Techniques

The key is to use tarps or other dividers to make 'rooms'.  You may want to make low false ceilings also to reduce the total volume of the space and help the air turnover rate.

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