Thread: My Clear vue installation

Originally Posted by RicB

At what point do you have to drop down to the smaller pipe Bob? If I was to make a 8-9" rectangular main duct across the shop roof is there any advantage, or for that matter disadvantage to making the drops 8-9" rectangular and then reducing down to 6" round pvc/flex for the final run into the machine?

There is no advantage because the reduction to 6" limits the flow to ~1250 cfm.
Disadvantage wise,
- a 6" flow limit of ~1250 cfm in a 8" square duct has an air speed ~2800 FPM. As this is below the 4000 fpm required to hold some sawdust in suspension so you might find a drop down of that size has problems.
- the blast gate for each of the drop downs should be as close as possible and preferably immediately prior to the main duct. If you make your own rectangular blast gates, no probs, otherwise I would just stay with the 6" for the drop downs.

OK, see if I am following this, because the drop down, which is 8" reduces down to 6" near the machine, this is a bottleneck that reduces the CFM in the 8"...correct?

Edit, I was thinking that regardless of where the 6" ducting is it would bottle neck the 8", but that is why you have two ports open on the max, yes

Originally Posted by RicB

OK, see if I am following this, because the drop down, which is 8" reduces down to 6" near the machine, this is a bottleneck that reduces the CFM in the 8"...correct?

Edit, I was thinking that regardless of where the 6" ducting is it would bottle neck the 8", but that is why you have two ports open on the max, yes

Yes that will help keep the trunk line clear but it won't help an 8" drop down stay clear.

Originally Posted by BobL

Yes that will help keep the trunk line clear but it won't help an 8" drop down stay clear.

Verstanden Bob, your understanding of things that suck is quite remarkable, you are the Proff Julius Sumner Miller of wood dust....."Why is it so, a shed full of dust, place the hard boiled egg over the Clear Vue......voila! atmospheric pressure does it's trick"

Originally Posted by RicB

Verstanden Bob, your understanding of things that suck is quite remarkable, you are the Proff Julius Sumner Miller of wood dust....."Why is it so, a shed full of dust, place the hard boiled egg over the Clear Vue......voila! atmospheric pressure does it's trick"

Not really - I've made and continue to make many mistakes. Maybe thats all it is - make enough mistakes and you might learn something - even if it is how to make mistakes.

Gents,

My understanding is that Ric will leave a 6 inch port open to scrub the air. If that is the case should he not run 8 inch from the cyclone to just past the point where is permanently open port is located at which point it would drop down to 6 inch? That way the velocity past the open port will remain above 4,000 fpm in a 6 inch duct when he is running a machine in that area.

Or have I missed something?

Originally Posted by John Samuel

. . . . Or have I missed something?

RicB is talking about using 8-9" rectangular duct as a trunk AND as the drop downs to his machines where he adapts the rectangular fitting to a 6" fitting. If he wants to keep the "drop downs" clear he will need a second port open near each machine.

Originally Posted by BobL

RicB is talking about using 8-9" rectangular duct as a trunk AND as the drop downs to his machines where he adapts the rectangular fitting to a 6" fitting. If he wants to keep the "drop downs" clear he will need a second port open near each machine.

There is no benefit in doing that, in fact just the opposite as the physical installation issues would present some real problems.

Just thinking put aloud really and weighing up the options. i think the best way is just a simple PVC setup, 8" main down the guts of the shed with 6" drops all with PVC fittings. I just need to find a place in Adelaide that doesn't make the PVC from Gold, price wise anyway.

Didn't think I was going to make it to the forums today, got the blue screen of death when I started up the PC, tried a couple of more times, got a couple of hung starts then I got on long enough to do a backup and system image copy...phew. I have been slack and haven't done a back up in a while.

Ric,

Got all of my pipes and fittings from Total Eden ... don't know if you have a local store. They were MUCH cheaper than plumbing supplies etc ... from memory, about 40% cheaper, and the pipe comes from the same factories.

Hey Russell, I've been looking back over this thread at your pipe work as I prepare to make some custom bends for my ducting. It looks like you switched from the technique of cutting wedges from the pipe and bending - to cutting all the way through and glueing the angled ring segments back together?
What's your latest opinion on best way to go for this? Is the liquid nails holding up so far?

AM
Oddy
Is the liquid nails(LN) holding,,,, yes I used hot glue in 4 spots just to hold it till the lay out was right then LN it. The hot glue is easily cut and re done if needed.
Yes I now cut all the way through it was easy in the long run. I made a jig up an run the pipe though the band saw rotating the 180 with every cut.
For a center of pipe radius of 170 app. The outside was 50mm and the inside was 25mm.
I made some bigger radius where a gentler curve would fit.
Check out the double joint pic I needed this in one spot so thing lined up better, that a 120 going into a 150mm 45 degree joint leg with horizontal angle also added.
Now go and buy one like that.

R

Ahh - the ol Wigwam for a gooses bridle joint, (As Maxwell Smart was wont to say)
Yes - tough to find those on the shelf at the hardware shop these days!

Inspirational work there!.

Hot glue & liquid nails - you say! (Mental note to self - remember this when ducting shed!).

Originally Posted by rusel

.....
Now go and buy one like that.....

Sure how much you selling it for?