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Thread: Recommendation for 3HP dusty?
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5th June 2012, 08:54 AM #1
Recommendation for 3HP dusty?
Looks like I'm going for a 3HP dust collector in an outside enclosure.
Its going to have to pull debris through 20m of 6" duct with elbows, gates, etc.
By the time it gets to the dusty there's not going to be a lot of suck left.
Wondering if its possible to get a 3HP dusty that doesn't have the twin bags (which I guess won't be needed as the pressure at the dusty will be so derated), just to save some space.
Other than that, what recommendations do people have on a good 3HP dusty that is designed and built well.
And also -- what if I put a cyclone inline in the duct before the duct leaves the garage (but the dusty is still outside) because I'm a bit concerned that if the duct clogs on the run outside, I'll have a hard time geting access to clear it.
The cyclone might the remove sticks + woolly stuff which together seem to cause blockages at elbows and such? Or is that not a concern with 6" duct?
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5th June 2012 08:54 AM # ADSGoogle Adsense Advertisement
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8th June 2012, 01:27 PM #2
I have a 1hp dusty sitting on top of a home made cyclone (2 x 44 gallon drums, top drum has funnel and is cyclone, bottom drum is collector) I vent the air that has been through the cyclone directly outside the shed with no filter bag so no loss of suction and it works very well. but I am not pulling air through such a long tube and have few elbows. there is a lot more suck with the filters removed.
Doug
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9th June 2012, 12:05 PM #3
Thanks Doug. I am finding this to be a demanding quest, getting dust collection right, at least for the sub-micron dust concerns. So far I've established that an impeller of about 14 to 15" diameter powered by 3HP seems to be the minimum requirement for that. But there is very little true performance data out there for good design decisions. Most of my concerns and queries are now in the thread "External DC - finding the best of bad options?", where, all due to the help of fellow forumites, there is some good progress.
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14th June 2012, 12:01 AM #4Senior Member
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Have you had a look at the Felder, 4hp 3 kw. Only problem is a wiring upgrade
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14th June 2012, 12:30 AM #5
Anodyne, is that what you've got? I had a serious look at the model below that, the Felder AF22 which is 2.2kW. 3 phase is no prob for me, nor is total current draw. But the prices start to edge up, as does the size of the thing. I've shifted my attention to the idea of an outdoor cyclone extractor, to save some shed space, possibly keep prices down, and besides that since it all has to vent outside, I'm thinking I might as well put the whole thing outside.
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14th June 2012, 05:39 AM #6SENIOR MEMBER
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A suggestion that might work ( I haven't tried it though). Could you attach a 1 hp portable dusty directly onto the machine to push the the flow toward the dusty outside? Like a booster. I would have thought it should solve the problem. Something like this:
http://www.carbatec.com.au/carba-tec...-compact_c1400
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14th June 2012, 09:03 AM #7
It's an interesting idea. There's a nice illustration of the effect of putting two fans in series in the free download link below. Basically, if you put two similar fans one after another in a duct, then the pressure will double, while flow stays the same.
So maybe fans in series, like putting a Carbatec DC impeller unit into the duct near the woodwork machinery, then the actual dust extractor (an impeller plus bins and filters) outside could be a solution if you have a long duct line that would normally kill your pressure through resistance. Could it be a way to use more 4" ducting too? What would be the down side of this idea? I wonder if anyone has tried it.
M.J. McPherson, Fans. In "Subsurface Ventilation Engineering", Mine Ventilation Services, Inc., see pp.26-27.
Fans by McPherson
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14th June 2012, 11:42 AM #8
This is the one I have and very happy with it. I have tall pleated filters, not the small ones shown.
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14th June 2012, 12:24 PM #9.
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Pushing air means pressurising ducting and blowers. PVC Ducting can be permanently sealed with something like PVC glue but there's little that can be done with a cheap blowers. Unless some care is taken they will leak fine dust out into the shed. If this extra ducting and the blower are outside the shed then it should be OK part from the extra noise. I have found little difference between the noise made by cheap small and larger blower/motors
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