PVC sewer pipe

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Forum topic by Jwhite2418 posted 03-01-2018 02:50 PM 912 views 0 times favorited 12 replies Add to Favorites Watch
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23 posts in 698 days

03-01-2018 02:50 PM

Topic tags/keywords: question

I choose to use 4” PVC sewer pipe (SDR35) for my dust collection system, which is working great. However I am upgrading my dust collector and I’m going to need 6” pipe for the main runs along with 6” fittings. Does anyone have a online source for pipe and fittings for this application. I have searched but not really having much luck. I have found a few items here and there but no single supplier for all.


12 replies so far

View WhyMe's profile


1209 posts in 2172 days

#1 posted 03-01-2018 03:23 PM

If you are just asking about SDR pipe look here…

View Thalweg's profile


103 posts in 4017 days

#2 posted 03-01-2018 03:57 PM

View ArtMann's profile


1462 posts in 1427 days

#3 posted 03-01-2018 05:01 PM

You may have to go to a plumbing supply company instead of a big box store. That is what I had to do. My HD and Lowes both have 4 inch pipe but no 6 inch. Plumbing supply places will also have S&D fittings, which are much cheaper.

View Fred Hargis's profile

Fred Hargis

5932 posts in 3105 days

#4 posted 03-01-2018 05:12 PM

Yeah, either the plumbing supply (first choice) or possibly a farm type store might have it. I did fall into a few sticks of it (6” 2729, which I prefer) at the local Restore. If you do have a Menards in your area, they stock the 6” 3034, and the fittings at about as good a price you’ll find.

-- Our village hasn't lost it's idiot, he was elected to congress.

View GrantA's profile


2134 posts in 2019 days

#5 posted 03-01-2018 05:21 PM

In the 6” arena you might find that galvanized hvac duct and fittings are more economical

View EarlS's profile


3436 posts in 2959 days

#6 posted 03-01-2018 06:10 PM

Do you really need a 6” duct for your DC? Going from 4” to 6” will reduce your air velocity by 1/2 which means your chips and saw dust may start falling out of the air stream in the pipe and not make it to your DC. Of course your pressure drop is less for the 6” line than the 4”. There are plenty of online calculators that you can use to figure out flow rates, pressure drops and velocities for different pipe sizes.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

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Combo Prof

3999 posts in 1889 days

#7 posted 03-01-2018 06:53 PM

It is likely he is now reducing from 6” down to 4” so it is better to go 6” for as long as he can and then reduce near the machine if needed.

-- Don K, (Holland, Michigan)

View Jwhite2418's profile


23 posts in 698 days

#8 posted 03-01-2018 07:23 PM

I am purchasing a Laguna C-Flux 2 HP cyclone DC. The inlet is 8” but the tool comes with a 6-8 reducer. The DC would be choked down too far with running only 4” mains. I still will have drops in 4”. However to keep the CFM at or near the optimum level the main trunk should be at least 6” according to the flow charts at Laguna

View Andre's profile


3021 posts in 2417 days

#9 posted 03-01-2018 08:57 PM

I ran 2 – 4” runs off the 6” inlet on my D.C.? LOL, found out that it will collapse a HD plastic garbage can real fast on the separator! This after 30+ ft. overhead line of 4” pipe, 4 – 90 deg. and 1- 45 deg. .

-- Lifting one end of the plank.

View Crashcup's profile


53 posts in 1811 days

#10 posted 03-02-2018 04:55 AM

I am purchasing a Laguna C-Flux 2 HP cyclone DC.

- Jwhite2418

Hope you post a review after you’ve used it for awhile. I’d really like to get one. That or the Jet 2hp cyclone. Not enough headroom in my shop for the taller units. Did you consider the Jet also? And if so, what made the decision for you for the Laguna?

On the SDR35, like someone else mentioned, Menards carries 6” also, but I believe they are in midwest states only. Not sure what you have in Oregon. I would think you could get it somewhere locally. Shipping charges might be high for 10 foot sections of pipe. A plumbing contractor maybe, or a local hardware store that does special orders?

Also, there’s another type of 6” PVC sewer and drain – ASTM D2729. It’s a thinner wall than SDR 35, but same OD and uses the same fittings. Cheaper and lighter too.

Good luck..

View WoodES's profile


162 posts in 2302 days

#11 posted 03-02-2018 06:19 AM

Another local source could be a landscape supply that stocks 6” drain pipe.

View Paul Mayer's profile

Paul Mayer

1089 posts in 3677 days

#12 posted 03-02-2018 12:54 PM

However to keep the CFM at or near the optimum level the main trunk should be at least 6” according to the flow charts at Laguna

Can you provide a link to this flow chart? I would guess that this machine would maintain adequate air speed with a short 6” trunk, but not a very long one. And I can’t imagine that you could run anything larger than a 6” pipe and maintain adequate air speed in the main trunk. Performance wise these are just a bit burlier than the 1.5 HP Flux, and those are nowhere near capable of maintaining adequate flow in a 6” main. Based on my recollection of the fan curve, I would lean toward running perhaps the first 10’ of duct with 6” pipe and then dropping down to 4”. If you want to extend your 6” pipe beyond that, I would consider moving up to the 3 HP system.

-- Paul Mayer,

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