Dust Collection

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Collection System

5/6/16       
Jeff M

Ok, so I inherited a dust collection system and have a question about how it was set up (probably 1st set up around 1987). The system seems to work great, but there is no return back to the shop. Above the cyclone, there is a huge outlet that just blows out to the outside.
Should there not be a filter system of some sort and return the filtered air back to the shop?
Do you think there is something aftermarket that will fit this thing?


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5/6/16       #2: Collection System ...
Jeff M

Sorry about the pic....I was lucky to get it in the post!

5/6/16       #3: Collection System ...
Jeff M

pic


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5/6/16       #4: Collection System ...
Curt Corum

Jeff, You will need an after filter with filter bags. They are available with weather proof enclosures and can be adjacent to the cyclone with return air duct back into building or located against outside wall just inside the building. The key is proper air to cloth ratio. You would not want to be any higher than 15-1, 10-1 is good. Example, if system is moving 2,000 cfm, you would need 200 square feet of cloth area. The blower on top of cyclone can be rotated to avoid additional elbows. The after filter, pipe, and elbows will add a couple inches or so of static pressure which may reduce the current air flow that the dust collector is providing. Hopefully, the added resistance will not reduce suction to below the necessary minimum for transport of sawdust and chips.

Curt

Click the link below to download the file included with this post.

After_Filters.pdf

5/6/16       #5: Collection System ...
Jeff M

Thank you Curt!
Are there any issues with carrying fine dust back into the shop air?

5/6/16       #6: Collection System ...
Curt Corum

Jeff, Yes, if system is 5,000 cfm or higher, spark detection and return air abort gate is required (NFPA 664). Under 5,000 CFM, spark detection only may be a requirement depending upon authority having jurisdiction, such as Fire Marshall. Looks like that motor may be a 7 1/2 or 10 hp. Typically, a 15 hp to 20 hp collector will be in that 5,000 and higher range. It is still a good idea to have a sprinkler head next to after filter plenum if located inside against an outside wall.

Curt

5/6/16       #7: Collection System ...
Puzzleman Member

Is there a problem with the current setup? Is there a large vacuum pull on the building?

I have 3 cyclones set up like this which let the air go into the atmosphere. I don't have to have to worry about emptying a filter bag, just change out the bag underneath. Have a sensor set up to let me know when it is full so the bags do not overfill.

5/6/16       #8: Collection System ...
Jeff M

No vacuum. Just would rather not pull all of the heat out of the building. But also, don't want to bring find dust back in.

5/7/16       #9: Collection System ...
David R Sochar

Not running the exhausted air back into building can cause a negative draft for the heating system. That is, the combustion gasses from the heater will not go up the furnace flue or chimney, but father go into the shop. This is toxic, and can be fatal.

If you have resistance or some other type of heat, the 'exhaust to the outside' may work, but there will still be a vacuum on the doors, and a loss of heating or cooling.

5/10/16       #10: Collection System ...
rich c.

OSHA is really putting an effort into proper dust collection. Blowing the fine dust back into the shop will put a layer on top of everything. That is what they are cracking down on. Not to mention the fine dust is the stuff that is really unhealthy. It's the stuff that goes through our lungs and does the real damage.

5/10/16       #11: Collection System ...
Jeff M

Thanks for the responses.

The only real issue in the shop now is the heat loss. Heat is electric so no fumes to be sucked into the shop.

I guess the question is...is it worth returning the air to save on the heating bill vs bringing in possibly more dust.

5/10/16       #12: Collection System ...
David R Sochar

Filtration is what is missing. You do not want to return air to the shop that is not filtered. Done simply enough with filter bags and a plenum that collects the fines.

Check with Oneida or any other vendor - give them your inlet and outlet, cfm, hp, etc and let them figure it out. They can also insure you configure the fan, cyclone, return, etc correctly so you get the best performance.


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