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Using ASTM 3034 - SDR35 - PVC Piping in Clearvue DC System

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Forum topic by MJCD posted 12-14-2013 12:11 AM 3286 views 0 times favorited 28 replies Add to Favorites Watch
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MJCD

483 posts in 1833 days


12-14-2013 12:11 AM

Topic tags/keywords: dust collection pvc 3034 sdr35 ducting

I’m upgrading my DC system to a Clearvue CV1800, and am researching Ducting alternatives.

I’ve read a great deal about thin-wall (ASTM 2729) white PVC piping – it’s lightweight, evidently in-expensive, and … virtually impossible to find – I’m in the Annapolis, MD area, and large plumbing supply houses won’t touch the stuff.

On the large-scale side is Schedule 40 PVC, that in the 6” diameter version is both heavy and expensive, as well as a special order from the Big Box stores.

Several Plumbing Supply professionals are recommending the interim ASTM 3034, or SDR 35 by another name, piping. While this sounds good, I can’t find comparative statistics to determine if the slightly thicker walling equates to a stronger pipe – there’s nothing that I can find which says the products are chemically, mechanically equivalent, with the only difference being additional thickness.

Has anyone used the ASTM 3034 (SDR 35) material in their DC system, and if so, can you provide commentary on how it’s handled the job?

Thanks for your input.
MJCD

-- Lead By Example; Make a Difference


28 replies so far

View Marcus's profile

Marcus

1149 posts in 1482 days


#1 posted 12-14-2013 12:32 AM

Will the PVC build up more static electricity than other pipe? My only thought when I read this was to make sure you have a grounding wire in place.

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MJCD

483 posts in 1833 days


#2 posted 12-14-2013 12:52 AM

Marcus:

Thanks for the response – fortunately, my electrical panel ground is close-at-hand, and I’ll ground the ducting to it.

MJCD

-- Lead By Example; Make a Difference

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AandCstyle

2566 posts in 1719 days


#3 posted 12-14-2013 01:02 AM

I once read that grounding PVC is pointless because plastic is an insulator so any grounding is only effective VERY close to a ground leaving the remainder unaffected. I have about 80 feet of PVC in my shop with metal blast gates and never get any static shocks from them. FWIW

-- Art

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Paul Stoops

339 posts in 2023 days


#4 posted 12-14-2013 04:30 AM

I live on the other coast of the country from where you are, so I have no idea what sources you might have for the ASTM D2729 thin wall PVC piping and fittings. That said I found these contacts as possible sources in your area, tho I don’t know how far away you are from any of these:

http://www.hellotrade.com/hardmetal-underground-supply/contact.html#
http://www.macraesbluebook.com/search/product_company_list.cfm?prod_code=3107250&region=Maryland-MD
http://www.mcmaster.com/#pvc-pipe-fittings/=psr1o3

I don’t know how the specifications for the ASTM D2729 and ASTM D3034 compare, but I suspect the latter is a little heavier wall thickness. I would think either would work for your application. I have a small shop plumbed with 6” thin wall D2729 PVC for my 3HP DC. A lot of folks who have ClearVue cyclones have used the 6” thin wall PVC ducting with great success.

Another possibility might be to contact either irrigation supply companies, or companies that install septic tank systems.

BTW, I find that static electricity build up on the PVC duct surface due to the high airflows only occurs here in the Seattle, WA area when the air is cold and the humidity is low. Annoying sometimes, but not dangerous and definitely not an explosion hazard as some folks would lead you to believe. Some folks have wrapped a grounded bare copper wire around the ducts they may come in contact with.

Hope you find what you are looking for.

-- Paul, Auburn, WA

View Fred Hargis's profile

Fred Hargis

3933 posts in 1955 days


#5 posted 12-14-2013 01:39 PM

I have a mix of both on my system. I started with the thinwall (2729) and then I moved and needed some more, but couldn’t find it. Menard’s carried the 3034, and actually had it for about the same price I paid for the 2729 so I bought it. Performance wise, you will not notice a difference, if there is one it would take laboratory instruments to measure it. The thin wall fittings still fit. Where you will notice the difference is in the weight, and maybe the cost. My system is hung from the ceiling, and I did it as a one man job. I doubt I could have done that with the 3034, it’s just a lot more awkward to deal with due to the weight. As for the cost, the thinwall I bought was quite a few years ago, at $17 per 10’ stick from a local lumber chain not known for discount prices. The 3034 I got from Menard’s for about $20 for a 10’ stick. Usually in rural areas you can find the thinwall, it’s used a lot on farms. But i live in a rural area, and it’s still tough. If you have a Hughes Supply nearby, try them.

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

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MJCD

483 posts in 1833 days


#6 posted 12-14-2013 07:34 PM

Many Thanks for the considered responses. From what I’ve researched, the 2729 has a regional availability, with Menards being one of the few big-box to have a supply, or have-supplied at one time. I’ve asked my contact at Clearvue for their opinion – Fred, my guess is they’ll be no issue. Previously, I had the shop piped with Schedule 40 (4”), so I could do the weight – not sure I could do this with 6”.

The Northeastern US temperatures fluctuates between 95 degrees and 15 degrees, and the somewhat thicker wall makes sense, on many fronts.

I’ll update this Forum Post when Clearvue responds. Thanks, again.
MJCD

-- Lead By Example; Make a Difference

View Paul Stoops's profile

Paul Stoops

339 posts in 2023 days


#7 posted 12-14-2013 07:58 PM

If you go with the 6” thin wall PVC, i highly recommend the PETG plastic duct hangers and the 6” blast gates that are sold by ClearVue Cyclones. I just finished helping a friend install his 3HP cyclone system using these products, and found they are easy to use and work extremely well. The hangers fit the ducting snugly and space the duct about 2” or so from the wall/ceiling, which was great clearance for the conduit we had installed on the ceiling for the overhead lighting.

-- Paul, Auburn, WA

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MJCD

483 posts in 1833 days


#8 posted 12-15-2013 01:03 AM

Paul, Others—

I received a fairly emphatic “NO” from Clearvue, on the SDR 35; with an equally emphatic “use the 2729”—so, I will.

The closest supplier is Cresline in Mechanicsburg, PA – a long driving-distance for me, but it’s better than paying shipping for the 10’ lengths, and boxes of fittings.

With this, Paul, I’ll look at Clearvue’s blast gates – I was going to make them; however, it may just serve me better to purchase them from the source.

MJCD

-- Lead By Example; Make a Difference

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khowarte

2 posts in 2080 days


#9 posted 12-15-2013 01:42 AM

I used the 2729 pipe that I found at a local plumbing supply house on my Clearview. The 2729 pipe has 28.27 sq in of area versus the SD35 only has 27.11 sq in which is a 4.1% reduction in cross section. To mount it I used 6” ss band clamps from Menards. I drilled a hole for a drywall screw at a location on the clamp that would put the clamp screw in a good location to tighten it. I used 2×4s fastened to the concrete wall and ceiling joist. I tried some tie wraps and they are hard to get tight. Menards had most of the thin wall fittings I needed. Used furnace 6” to 4” reducers at the equipment. Cut slots with the bandsaw in the 2729 to get 6” hose on and used band clamps to secure it.

View JJohnston's profile

JJohnston

1614 posts in 2753 days


#10 posted 12-15-2013 02:31 AM

I used nothing but SDR 35 on my Clearvue system. I couldn’t get the super-thin wall locally. It works fine. Weight is not an issue. I’ve got mine held up with small screw eyes and soft steel wire.

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

View Shawn Masterson's profile

Shawn Masterson

1297 posts in 1410 days


#11 posted 12-15-2013 01:59 PM

I used sdr35 on mine. the stuff I got was 14’ lengths and has rubber slip gaskets on the end bells and fittings. The cost was minimal compared to the cost of glue fittings. I went this route thinking it would be sealed better. I would not recommend it. the fittings were very hard to slide together, and I think they will come apart even harder.

View Fred Hargis's profile

Fred Hargis

3933 posts in 1955 days


#12 posted 12-15-2013 02:15 PM

Did CV say why they were so adamantly opposed to the heavier pipe? That 4% reduction in cross section doesn’t seem like it would make that much difference.

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

View Grandpa's profile

Grandpa

3256 posts in 2137 days


#13 posted 12-15-2013 03:20 PM

the fittings were very hard to slide together
Did you try using dish detergent for a lubricant on the rubber gaskets? This usually makes rubber components slick and it will not normally harm most gaskets. When it dries it might be even more difficult to take apart but not impossible.

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MJCD

483 posts in 1833 days


#14 posted 12-15-2013 03:21 PM

Fred, ...:

The comment from Clearvue is that SDR35 is “Thicker and Heavier”. I interpret this as resulting in the smaller ID. From an airflow perspective the different may be only 3.1% (it’s the % change in the square of the ID: 6.175 (38.1) vs. 6.095 (36.9)) – I’m not sure about this, but it’s between 4% and 3% – not much, for the wear & tear I’ve gone through to find the 2729).

I’ll trust Clearvue’s comment – from their perspective the SDR 35 is more expensive, heavier to install, and results in lower CFM & higher Static Pressure. Availability becomes my issue – no disrespect to Clearvue – they have been GREAT in addressing my questions (nice people to deal with).

The SDR35 comes in both Gasketed and Solvent Weld (attachment differences) – my plumber strongly recommends against the gasketed – once it’s together, nothing gets it apart; and the tolerances are such that I shouldn’t have to ‘solvent weld’ the fittings.

My homework is near complete: if the 2729 is available locally (I’ll find out tomorrow, Monday), my plumber can purchase it – it will be my hands-down selection. If not available locally, I’ll have to pay List Price and drive 225 miles (round trip) to get it; tipping the decision to the 3034.

Everyone, thanks for the input.
MJCD

-- Lead By Example; Make a Difference

View shipwright's profile (online now)

shipwright

7167 posts in 2260 days


#15 posted 12-15-2013 03:30 PM

Have you looked at PVC fitting prices? Check this out before you spend too much.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees. http://thecanadianschooloffrenchmarquetry.com/

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