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Help! Dust collector pipe collapsed

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Forum topic by RlPorsche posted 1751 days ago 2791 views 0 times favorited 7 replies Add to Favorites Watch
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RlPorsche

2 posts in 1751 days


1751 days ago

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?

Thanks


7 replies so far

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 2801 days


#1 posted 1751 days ago

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

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patron

12844 posts in 1842 days


#2 posted 1751 days ago

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

MedicKen

1599 posts in 1964 days


#3 posted 1751 days ago

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

View Greg The Cajun Box Sculptor's profile

Greg The Cajun Box Sculptor

4739 posts in 1810 days


#4 posted 1751 days ago

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.

-- Every step of each project is considered my masterpiece because I want the finished product to reflect the quality of my work. http://www.FineArtBoxes.com

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PurpLev

8473 posts in 2150 days


#5 posted 1751 days ago

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

ND2ELK

13495 posts in 2275 days


#6 posted 1751 days ago

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

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RlPorsche

2 posts in 1751 days


#7 posted 1750 days ago

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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