Help! Dust collector pipe collapsed

You must have a powerful DC. What size is it?

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

you might open the line somewhere a little ,
as your 4” is choking the 6” .
and the suction is building up .

-- david ,new mexico ,allheart

Standard HVAC pipe is NOT recommended for dust collection systems because of the thin wall thickness. It can, and as you have experinced, collapse.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

If you want to use metal pipe you should use spiral pipe that is made for dust collection. HVAC pipe …as you found out…is no good for dust collection. It is for Heating Ventilation Air Conditioning, which does not have anywhere near the pressure rating as dust collection requires. You can also use schedule 40 PVC pipe which is far better than HVAC. Several woodworking supply companies sell adapters that allow you to connect it to standard 4” dust port tool fittings.
There is a lot of info out there about the numerous options of dust collection options.

-- Each and Every step of any project should be considered your masterpiece if you want the finished product to reflect the quality of your work. Greg Little

HVAC pipe is not heavy duty enough to handle air pressure of DC – as you’ve obviously noticed.

suggestion? since you have some of the layout already made – go with the spiral metal ducting that is made for DC. OR, go with ASTM 2927 PVC – it’s thiner than Schedule 40 PVC, lighter, but can withstand the high pressure of DC. however I’m not sure is it’s available in 8” diameter… it is in 6” and 4”.

what DC are you using?

-- When in doubt - There is no doubt - Go the safer route.

I used metal duct work from Penn State and it works great. Look at my layout and you can see how it turned out. Good luck!

God Bless
tom

-- Mc Bridge Cabinets, Iowa

Thanks for the input, my idea worked great!! I am running 45’ of 8” , 3/ 90s, 1/8”X6”X6” combo, 1/8”X6”X6” combo, 30’ of 6” , 2/90s 1/^”combo., 3/6”X4” reducers, 3’ of 4” ABS 4/1/4 bends and 20’ 4” flex with 5’ 0f 2” flex for a vacuum line with a total rise of 20’. My vacuum line works better than a new shop vac. With my drum-sander & planner line open, I need to make some blast gates.

After seeing the efficacy rating of spiral, the size available in PVC, ABS, cost of laser welded stainless what I have works well so far and is (I used almost no screws through my pipe) rated the same as laser welded pipe