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Dust collector question

8/26/17       
Mike Fuson

My shop is out in the sticks, I own a lot of property and no neighbors. I dump my dust collector bags about 20 feet from the shop and when I get a decent pile I spread it through a field with a tractor. Works out good. Here's the question, instead of constantly dumping bags what would it hurt to modify the dust collector to where it don't fill the bags but just get piped straight out the wall. I could do away with the bags and pipe straight off the top of the squirrel cage blower to the ceiling and out through the wall. The saw dust would end up in the same place. The pipe would have to e about 20 feet long. Are there any issues with doing this? It would seem to me that it would have maybe even more power since it wouldn't have the resistance of the top bags that filter the air. Thanks

8/26/17       #2: Dust collector question ...
Bob

What about moisture problem from humidity & rain? I would imagine the pipe would get damp and cause the fine dust to stick to the sides. This would build up over time and cause a possible fire hazard.

8/26/17       #3: Dust collector question ...
Mike Fuson

I hadn't thought about that Bob, might have to put a downward angle on it as it leaves the building or a damper.

8/26/17       #4: Dust collector question ...
Leo G

I see no real issues in doing this. Just pipe straight to the blower output to the pipe leading outside. Maybe put a large cart out there so you can carry the chips out to the area you distribute them now.

8/26/17       #5: Dust collector question ...
Steve Member

Bob's point will probably be a killer; at the end of the run sudden drop of pressure would leave a big mess around the outflow (by mess I am not speaking of pretty) but gumming up everything particularly with first light rain; lastly with 2 90's as describered and 20+ feet of run would you have enough dry pressure? The moisture referred to will cause immediate drag friction in the pipe so you would probably end up with a clogged pipe and cleaning it out will more than offset the intended gains.

8/26/17       #6: Dust collector question ...
John Member

Run the end of the pipe into the side of a plywood box with no bottom. Maybe a 2 or 3' cube. I'm sure there are similar solutions that would keep rain off the end of the pipe. It is likely your bags are causing a larger back pressure than the new lengths of pipe and elbows you will add so, yes, it's likely your motor load will increase. Just measure the amps and make sure you stay within the motor rating.

John

8/26/17       #7: Dust collector question ...
duster

I don't know about the climate in your area, but if it get's cold in the winter you're going to be sucking a lot of heat out of your shop.

8/26/17       #8: Dust collector question ...
rich c.

Just get a wagon with hydraulic lift, or manure spreader with higher sides added. Blow it directly into that and then take that out to spread it.

8/26/17       #9: Dust collector question ...
Mike Fuson

Duster, I hadn't thought about the heat issue, that probably kills the whole idea. Thanks for the input.

8/26/17       #10: Dust collector question ...
John Member

I blow the exhaust from my 1200 CFM DC outdoors. I live in western NY and it is cold here in the winter, lots of days below freezing. I sometimes have my DC on for an hour. Yes, the shop gets cool, losing maybe 5 - 10 degrees, but there is so much mass inside that it quickly warms back up when I shut off the DC. Note: I do have central heat in my shop.

Results are going to depend on how large your DC is, how large your shop is and how much mass is in it, and how long you leave the DC on. Keep in mind, if you send your DC exhaust outside you need to create a source for make-up air.

John

8/27/17       #11: Dust collector question ...
David R Sochar Member

If you are using standard heating and cooling, you will loose the air you paid to get to the right temperature. This is why the air is recirculated in most systems. That means filter socks or similar. Contact Oneida Air to get info on what it will take. My filter socks run in a plenum up in the rafters, with a clean out in the bottom.

If you want to drop shavings outside, you then need a rotory valve to keep the pressure high in the system, forcing air thru the filters. Then you can have whatever type of heat you like since the shop is not de-pressurized by the fan.

Another negative for your plan as presented is that if you have a combustion type heat - gas, oil, wood, etc. the fumes may not go out the chimney but be sucked into the shop and kill you.

The talk of moisture and clogging is not an issue - I'll bet lunch on that one.

If you proceed with your plan, I'd take it up a bit and park a trailer under the outlet and make it easier to move to where you want it. It will really improve the soil over time, especially if you can turn it a bit to get it mixed in with the existing soil.

8/27/17       #12: Dust collector question ...
Kevin Jenness

The first shop I worked in 35 years ago did just what you are contemplating. It was uninsulated and evidently leaky enough that the woodstove still had enough air to draw- but believe me, in a Maine winter we had to keep it stoked.

The best setup I have seen had a cyclone with a rotary air lock over a trailer, just as David describes. A bit of an investment but it should pay off in labor cost over time.

8/27/17       #13: Dust collector question ...
Larry

David's points are all true. We live in a cold in winter area and recirculate the dust collector air, only in winter. Our cyclone has a rotary valve that drops the chips into the dump trailer (8x10x5'.) The fines go into an 84 bag shaker house. A horse stable picks the trailer up, returns it and pays us $60. Must be careful to not let walnut go into trailer.

8/27/17       #14: Dust collector question ...
rich c.

You might consider a mechanical saw dust removal system. Something similar to a saw mill. Bring the sawdust into a hopper or pit in the shop, then a small diameter auger to move it out to the wagon. Look for sawdust or hog feed augers.

8/27/17       #15: Dust collector question ...
duster

My largest dust collector is a 10 hp cyclone with rotary air lock. With the cyclone & 2 filter bags attached to 55 gallon drums, the apparatus was 12' tall. It was too tall to fit inside my shop's 10' ceiling. So, I built an addition to the shop to house it with a return air duct so I wouldn't lose too much heat. I then attached a 1.5 hp blower to the rotary airlock to suck the chips out and blow them into my dumpster via a 4" hose and a plywood manifold that fits under the dumpster lid. I still lose a little heat with this configuration, but the labor savings from not having to constantly empty containers make it worthwhile.

9/2/17       #17: Dust collector question ...
Pete Anderson Member

Website: petesfloors.wordpress.com

I have been adding dust/wood flour to the soil in our garden for over 30 years. When wood or cellulose breaks down it takes nitrogen from the soil. I add nitrogen fertilizer to replenish what the wood draws as it decomposes. I have added more than a foot to the height of my garden. Wood adds humus, but removes nitrogen, which plants need.


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