Help! Dust collector pipe collapsed

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Forum topic by RlPorsche posted 07-03-2009 05:28 AM 4581 views 0 times favorited 7 replies Add to Favorites Watch
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2 posts in 3484 days

07-03-2009 05:28 AM

Topic tags/keywords: dust collector

Just hooked up my new dust collector & about 15’ of the 8” metal pipe collapsed flat. I used HVAC standard ga. Due to price & viability over spiral. I had a 6” opening in the pipe while running drum sander with 4” connection, it was getting every little spec then wham. Three sections of pipe collapsed flat. I realized this HVAC pipe dis-connects by pushing in on the seam, my current thought is to use 12” plywood squares with 8” holes in them, then place then every so often so the pipe can’t distort then collapse, screw the seams to the plywood with a “L” tab plus tape the seams. This is a lot of work for an untried idea, any suggestions?


7 replies so far

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 4533 days

#1 posted 07-03-2009 05:58 AM

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.

View patron's profile


13641 posts in 3575 days

#2 posted 07-03-2009 06:00 AM

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

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View MedicKen's profile


1615 posts in 3696 days

#3 posted 07-03-2009 06:27 AM

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

View longgone's profile


5688 posts in 3542 days

#4 posted 07-03-2009 06:43 AM

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.

View PurpLev's profile


8548 posts in 3882 days

#5 posted 07-03-2009 06:57 AM

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.

View ND2ELK's profile


13495 posts in 4008 days

#6 posted 07-03-2009 07:59 AM

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

-- Mc Bridge Cabinets, Iowa

View RlPorsche's profile


2 posts in 3484 days

#7 posted 07-04-2009 05:05 AM

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

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