Thread: Extraction System Men Shed

Originally Posted by Brian45

At this stage the inlet is 225 mm metal which we have punched through the block wall into the woodworking workshop. From here we were looking at running 225 PVC around the side and end walls if we can get this size, if not 200 mm. From there we will junction off to all the machines and also install a couple spares, just in case outlets.

225 or 200 mm PVC ducting is as rare as hens teeth.
If you want to use PVC you will have to use 9" which is actually 240mm unless you go for other ducting.
Even if you can get other sizes the price of the junctions will be a killer compared to using the PVC 9">6" Y's
The 240mm PVC will be fine for a trunk line,

Next, reduce down from 225 /200 to 150 mm, run the 150 down as close as possible to the machines and then couple with flex tube to the machines. Somewhere in the 150 mm section of PVC we will install blast gates at each machine

Keep the flex to as short a length as you can - if possible hard pull the machines in with hard PVC.
The best place to locate gates is at the junction between the 9 and 6" PVC _ i realise this may be high up but this is where ROCKER style gates come in handy - do a search for these and you will see plenty of examples.

Hi,

I had not really looked into what is available in PVC. It is more than likely it will be run in 150 mm as this is more readily available. I will check out the Rocker style gates.

I noticed a comment you make on a shed build where he has run his extraction system, about the location of the gates so have taken this on board.

Brian

Originally Posted by Brian45

Hi,
I had not really looked into what is available in PVC. It is more than likely it will be run in 150 mm as this is more readily available. I will check out the Rocker style gates.

If you use only 150 mm then you really can only extract dust from one machine at at time. The principle of using larger ducting for a trunk line is so you can run more than one machine at a time. A 7Hp DC with 240mm ducting can easily run multiple machines.

Most mens sheds I have visited run 240 mm trunk lines and 150 mm down to machines.

Well I contacted a local supplier and they do have PVC in 225 up to 450 so this looks like being the option to explore in more detail, as there is no metal fabricators of ducting in Darwin. Not sure the cost difference between metal and PVC, however I do know which will be easier to work with and if we need an extra elbow/s just going down the road is much easier then getting one ordered from interstate.
Even more surprising everything is in stock.

What's your thoughts on installing something like this

iVac pro blast gates - is there a brand you know of, made in Australia?

I feel having the blast gates automated will solve a few issues.

Dusty penertration.jpgFrom here we will junction to the right and then run over the top of the roller doors. IMG_3786.jpg we have installed brackets to support C section channel. The C section channel will run the full length over both roller doors and act as cable tray and support for the dust extractors trunk line. IMG_3790.JPGwe will also put supports in along this wall to hold the dust extraction trunk line. IMG_3792.jpgWe will continue the trunk line the same over the doors as mentioned previous.

As this is an old fire station the black is just the soot from the fire engine exhaust.

Brian

For what it's worth I suggest that you get rid of that throttle point on your main duct

Originally Posted by Brian45

Dusty penertration.jpg

run a full diameter main past as many machines as possible

Hi,

Yes that was only a test piece made up by a local air conditioning group. Its just sitting there. What you see will need to be cut back to the wall and then the main trunk line can be run around the building with junctions where tools will be placed.

As usual before we can start the ducting a lot of other matters need to be addressed. It will happen as soon as we can manage to get all our ducks in line.

This are starting to ramp up and we are getting rather close to starting our extraction system.

Dusty penertration.jpg

Having a bit of a discussion today on how to branch off from this metal dusting. Don't worry about the reducer it not being used.

The size of this workshop is 9 x 11 metres, if we branch of here with a 90 bend to the roller door and by the time we get around the shed to the end of the system we would have used 4 x 90 bends and a total length of say 27 m. I feel this is a long run although we do have a 7.5 HP extraction system and the main will be 225 / 240.

The main tools that will cause the most dust will be within the first 14 m - Sliding TS - Bandsaw - Thicknesser - Jointer - Drum sander. After the 14 metres will be a drop saw and a couple of lathes.

If we don't use 90 bend we could branch off with a 45 bend and use them instead of 90 bends in the corners which will shorten the overall length by a few metres, bit more work involved. This would require drilling into the ceiling, and its asbestos.

Of course the simplest would be to run straight across the 9 m to the other wall and branch off picking up the tools on the way. This would mean drilling into the ceiling maybe 20 times, this could be done just have to be suited and masked correctly.

Any thoughts? As I would like to start drawing the system up and organise what we need and look at getting this started.

Draw the various options up showing machine locations and post the drawings. It's much easier to post comments on these as opposed to the descriptions.

I am sure you have some members who are kicking up a stink about all this.

Make the duct big enough to fit one old sods head in if he starts cracking a fruity. The others will quickly fall into line after that.

Hi Bobl,

Will do as soon as I get the opportunity.

Brian - I have a couple of 10M lengths of high quality flexible PVC/PE ducting in 250mm diameter, available for sale. It's NOS, but it's been laying around for about 12-18 mths.

It is made in Italy, and has a spiral copper wire wound into the construction for static charge reduction, or for a communication system.

The ducting is located in Perth, and it's bulky, so I'm not sure if the cost of transport to Darwin would kill any purchase plan.

I guess you know this stuff is super-expensive to buy from industrial suppliers - about $130 a metre, as I understand.

I'm not looking for anything like new price for it, around a quarter of new price would keep me happy.

Ducting.jpg

Hi,

Thanks for the offer, the cost of transport would be a killer. I priced some metal from Brisbane and it was a little dearer than PVC and then we had the delivery cost. I dare say we will stay with PVC and wrap it with copper wire or run copper internal to combat static electricity. Things are moving rather quickly now our major tools have been ordered and I expect in about a month they should arrive. So I need to get my butt into gear and finish the drawing so I can get a plan of what we need. There is a lot of work to do to not only install the extraction system but to run the electrical wiring.

We will not be installing automatic gates at this stage, so all will be manually operated.

If anyone is interested I will take some photos and post as we start our system install.

Originally Posted by Brian45

I dare say we will stay with PVC and wrap it with copper wire or run copper internal to combat static electricity.

This is completely unnecessary and a waste of time and money - the amount of static that can discharge from PVC ducting is just enough to be felt, but nowhere near enough to cause any other problems. This is not just hearsay, there's solid physics behind it as well.
In addition, running the wire internally is a sure fire way for shavings to get caught up inside and block the ducting enough to restrict the flow..

In addition, running the wire internally is a sure fire way for shavings to get caught up inside and block the ducting enough to restrict the flow..

Ahhh, it may not be clear in the photos, but the copper wire in the ducting I have, is molded inside the PVC, so I can't see where it could get shavings caught up in it. The copper wire is relatively fine, it plays no part in strengthening the ducting, as you may have thought. The ducting strength comes from the PU ribs.