Thread: 150mm Flex hose's

I'm sure I read somewhere (could be on here?) that a 2hp extractor wouldn't produce enough flow for 6" "ducting". The air seeder hose at 5kg/metre will be very heavy, and not all that "flexible" but should be smooth on the inside. The other corrugated hose, if the airflow is insufficient, may trap dust in the corrugations? Both seem hugely expensive though! Are you sure you can't get away with 5" hose, from H&F it's waaayyy cheaper at $18/metre...

Edit: I'm a farmer, and I've used air seeder hose but not that big. It's not super flexible, and as I said it is heavy. It's designed to be flexible enough to be fitted in a smooth arc and then absorb vibrations. It's not designed to be "flexible" in the same way a hose pipe is flexible!

Try eximo speedlok

http://www.speedlock.com.au/pdfs/CLEARFLEX.pdf

This is their very flexible hose but they do a heavier duty one. I have bought my last two lots from them.

Beware, their measured lengths are hose which is stretched to the max.

honestly, just go with the usual guys.

carbatec (normally have it) and don't be fooled by the price they will sell it by the meter and just cut it for you
10 metres of 6" Plastic Collection Hose | Carbatec

timbecon will probably do the same thing
https://www.timbecon.com.au/flexible-dust-hose

Originally Posted by Warb

I'm sure I read somewhere (could be on here?) that a 2hp extractor wouldn't produce enough flow for 6" "ducting".

Generic 2HP DCs have be modified )as per the sticky thread at the top of this forum) to take advantage of 6" ducting.
The all black high temperature hose hose has corrugations that are too large and will interfere with the flow.
The air seeder hose is much better corrugation wise but very steeply priced.

Many years ago I managed to pick up some 6" hose similar in profile to the air seeder hose but for only $50 for 6m length..
Mine is designated as high temperature hose, coloured green and black, and is quite stiff.
I've used a couple of meters of this in a few places in my ducting system.

In this situation it provides the flexible connection for the lathe BMH
IMG_3621p.jpg

Here its the hose for a 10" planer thicknesser.
IMG_3623p.jpg

My testing has shown it is superior to either of the Timbecon/Carbatec hose but of course normal pricing is "ouch".
On high flow systems the stiffer the hose the better it seems to work so the stiffer Timbercon PVC stuff is slightly better than the softer PU hose from Carbatech.
On a 2HP DC you won't notice much difference.

Many thanks gents

The heavy duct was really only going to be used from the Thein baffle input down to the floor and the two 90deg bends getting from the DC output to the roof duct. I might also have used it around the Combo Table saw just for ease. I will be chasing up the other options, the price/performance difference isn't worth it.

I have a fair bit of work ahead of me.

I have read through the sticky, most of more than once as I try to get my head around it all. Ideally a Clearvue would be on it way, it's not an option I have available to me until the Lotto people remember where they put my phone number. Until then I will have to try and get the best out of what I have and I think I can get much better results with some effort on my part.

Thanks again

I like the Thein set up in the drum. It would be nice to get some flow figures on the system.

That much flex and that junction high up in the roof will result in major choke points in the system
I'd recommend combining those two ducts into one using a PVC Y (and a PVC 45º bend) and replace the flex with PVC ducting.

Also highly restrictive is using 4" ducting - with a 2HP DC and a thein baffle you will be lucky to get 300 CFM through that DC.

To remove fine dust at source you need to increase the flow.
The CFM rating on they side of that DC is basically bollocks - its just for the impeller performed using a flawed measurement standard.
To max the flow modify the DC as per the sticky at the top of this forum and don't use a cyclone or Thein.
Then use 6" ducting and open up the machine ports to make use of the 6" ductings.

Lappa

As a separator it works pretty well, only fine dust gets past it. Until I flooded the drum and ejected a couple of bucket fulls of thicknesser shavings into the back yard. They mowed in.
I would like flow figures as well but a lack of suitable test equipment, and I can't justify spending the money, means I will continue to fly as is. I will try and come up with a test of some kind but it will be indicative only and won't provide numbers.

BobL

I put the system together before I joined the forum and I really had no idea what I was doing. The flex will be coming down when the spray booth is removed, I am almost done with it, and 6" PVC will be used almost all the way through. I will use a short section for the 90deg bend off the back of the DC, I am looking forward to taking to the machines to open up and improve the air flow. None of them are in warranty so no issues there.

The Thein separator is my only filter, I put the pic of the ring in simply because it had some info on it. Currently the exhaust from the DC is fed up and along the roof and directly outside.

Is the Thein a bigger choke than the bag filter?


Jase

Originally Posted by Jasethebeginner

I put the system together before I joined the forum and I really had no idea what I was doing. The flex will be coming down when the spray booth is removed, I am almost done with it, and 6" PVC will be used almost all the way through. I will use a short section for the 90deg bend off the back of the DC, I am looking forward to taking to the machines to open up and improve the air flow. None of them are in warranty so no issues there.

That sounds better

The Thein separator is my only filter, I put the pic of the ring in simply because it had some info on it. Currently the exhaust from the DC is fed up and along the roof and directly outside.

That sounds like a long ducting path which will reduce flow which further adds to reduced flow.

Is the Thein a bigger choke than the bag filter?

The degree of choke depends on a bunch of things.
The lower the starting flow (eg a stock 2HP DC with 4" ducting) the less of a choking effect the thein and filters will have.
This sounds good but all that means is you are not collecting enough air and fine dust at the source of the dust.
As one tries to get more performance (flow) out of a (especially a small) DC the max flow is always obtained using no separator/cyclone/thein and keeping the filters clean.
The amount of invisible dust (not visible sawdust) needed to send a small to medium size shed above a safe health limit is about 3 match heads worth.

If you use a separator/cyclone/thein on a small DC because you don't want to clean filters then I recommend adding forced ventilation.
Somewhere between a few bath room fans and this should do it.
IBigAssFan2.jpg