Thread: New Timbecon cyclones all seem to be 5 inch

Interestingly 5" ducting is as common as mud in a wet paddock, it's a standard metal duct size for ventilation and range hood exhaust etc

Here's the 6" to 5" in plastic Blauberg 150 - 125mm Fan Exhaust Duct Reducer | Bunnings Warehouse
Better yet is the metal one Pacific Air 125 - 150mm Duct Adapter | Bunnings Warehouse
Even the semi rigid in 3m lengths is cheapish in 125 and 150

I am pretty sure that expandable semi-rigid tubing is unsuitable for a suction system that is under vacuum.
But happy to be corrected if this is wrong.

I don't know anywhere which does 5" pipe (at reasonable price).
And I want to avoid reducing everything to 4" ducting.

Originally Posted by John G

I am pretty sure that expandable semi-rigid tubing is unsuitable for a suction system that is under vacuum.
But happy to be corrected if this is wrong.

Anything that's going to move or vibrate under air flow is going to cause more turbulence and reduce flow.

And don't forget , under the same pressure, 5" ducting has about 1.8x the air flow of 4", and 6" has 2.9x.

The Timbecon cyclone looks like an old design and, like any 3rd party cyclone, not being specifically matched to any single impeller is likely to result in significant pressure losses.

Originally Posted by BobL

Anything that's going to move or vibrate under air flow is going to cause more turbulence and reduce flow.
And don't forget , under the same pressure, 5" ducting has about 1.8x the air flow of 4", and 6" has 2.9x.

I meant more that the expandable duct tubing is too thin and weak, and would likely collapse. The airflow and negative pressure from a rangehood exhaust fan is nothing like the airflow from your DC. Hence not suitable for use as DC ducting. Hence, unless piping is readily available, cyclones with 5" inlets and outlets are pretty pointless?

Originally Posted by John G

I meant more that the expandable duct tubing is too thin and weak, and would likely collapse. The airflow and negative pressure from a rangehood exhaust fan is nothing like the airflow from your DC. Hence not suitable for use as DC ducting. Hence, unless piping is readily available, cyclones with 5" inlets and outlets are pretty pointless?

Yeah the flexible pipe is definitely a bit thin, the point though is the 125mm gal fittings are common and 125mm to 150mm adapters can be bought so you could adapt to 6" without much trouble and 125mm gal pipe (not flexible) is not hard to buy.

I agree the flexible would likely crush under suction but how about the pressure side in 200mm size to exhaust air outside..... just trying to think outside the box here

5” gal ducting is industry standard, my system is main trunk 10” and the droppers are 5” then a gate and either 5” or 4” flexible to the machine outlet.

Originally Posted by riverbuilder

5” gal ducting is industry standard, my system is main trunk 10” and the droppers are 5” then a gate and either 5” or 4” flexible to the machine outlet.

Where from???
I must be doing something wrong - if I google 5" industrial ducting, all I get is rangehood accessories. I can't find anywhere which does 3-6m rigid piping...

All Hammer machines are equipped with 5”/125mm outlets. Contact Felder.

Regards from Perth

Derek

I get mine from Indux, at Brookvale in NSW, or ezi-duct, in Sefton. Both are specialists in industrial dust and fume extraction systems. They could recommend someone in Melbourne or just courier you what you need, they know all about it.

heres one at carrum downs. Industrial Dust Collectors, Fume Extractors, Dust Control Service, Fume Extraction Systems | Dust Extraction Solutions

The galvanised systems we have had a look at in comercial use are 150mm. Best stick to 150mm as blast gates are either 150 or 100mm from all suppliers that I know of. I am sure that the DE could be modified to 150mm if you felt inclined to do it.

Ezi-Duct have 125mm duct available ex-stock at their Melbourne branch. Contact details are:


VIC, SA, TAS, WA – 03 9793 0007
Unit 1, 2 - 4 Kirkham Road,
Dandenong South Victoria
Tel: 03 9793 0007
Fax: 03 9793 0037
[email protected]
David 0402 921 597

It's going to be pretty expensive though, you would probably be better off using 6" PVC and transitioning to 5" with a metal adaptor at the cyclone inlet.

Originally Posted by aldav

It's going to be pretty expensive though, you would probably be better off using 6" PVC and transitioning to 5" with a metal adaptor at the cyclone inlet.

Yeah, that gets back to my original point - 5" might be industrial standard, but not suitable (too exy) for domestic use.
Which is a shame, cause I got pretty excited when I saw these as it would be a hell of a lot easier/quicker than me trying to make my own.

I don't think 6" transitioning to 5" would work really well because then you are trying to duct through 6" but all being constrained through a 5" bottleneck. The only other option would be to transition down from 5" into 4" ducting, but that doesn't sound like a great idea either.

Forget 4", 5" has 50% more flow than 4" and that's before you take in to account the increased drag of the smaller diameter on the airflow. Provided the airflow is sufficient to keep the dust in suspension (it should be as long as you keep the DE filter cleanish) then there would be no problem using 6" PVC and transitioning to 5".

Your best chance to get 5" gal duct at a more reasonable price would be to try a heating and cooling specialist or a sheetmetal manufacturing place. You don't need anything too heavy and it doesn't need to stand up to the treatment it would possibly get in an industrial situation.

I might be misunderstanding your requirements, but 5” flexible pvc ducting and fittings are available from Carbatec.

ducting 5 metres of 5" Plastic Collection Hose | Carbatec
fitting Dust Y-Junction - 5" | Carbatec
Metal blast gate Carbatec 5" Blast Gate - Metal | Carbatec