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Questions on 6” trunk line

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Forum topic by SweetTea posted 03-14-2018 11:38 AM 275 views 0 times favorited 7 replies Add to Favorites Watch
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SweetTea

352 posts in 776 days


03-14-2018 11:38 AM

Hey fellows, I could use a little bit of help with my new dust collection setup that I am trying to make. First off, I am using a 3HP Grizzly d/c vented straight outdoors. I will have a (d2729) 6” pvc trunk line that will have approx 3 drops. The trunk line will be approx 25ft long.

My first question is, what are the best ways to implement the drops? Wye fittings or ??

My next question is how do I add blast gates to the 6” trunk line itself? I plan to transition down to 4” flex hose as close to each machine as possible, using the 6” pvc down each drop to approx 2ft to 4ft from each machine. I know that I can put blast gates in the 4” flex hose, but I would like to have a 6” blast gate in two places so that the d/c doesn’t have to pull air through all that unnecessary space. Does anyone make a 6” blast gate that will fit over (d2729) 6” pvc pipe?

Any advice on my questions would be greatly appreciated. Thanks.


7 replies so far

View Sparks500's profile

Sparks500

197 posts in 447 days


#1 posted 03-14-2018 12:07 PM

Wye fittings, double 45 fittings with at least a 12” straight in between. There are lots of plans for wood blast gates. Mine are plywood and hardboard. Cut up 6” couplings and used gorilla glue to bond it to the plywood. I think Woodcraft may have 6” gates, IDK if Rockler does.

-- A good day is any day that you're alive....

View SweetTea's profile

SweetTea

352 posts in 776 days


#2 posted 03-14-2018 01:18 PM



Wye fittings, double 45 fittings with at least a 12” straight in between. There are lots of plans for wood blast gates. Mine are plywood and hardboard. Cut up 6” couplings and used gorilla glue to bond it to the plywood. I think Woodcraft may have 6” gates, IDK if Rockler does.

- Sparks500

Ok so wye fittings for the drops. Where would the double 45’s go?

View jimintx's profile

jimintx

820 posts in 1701 days


#3 posted 03-14-2018 01:24 PM

Double 45: a 45, a short straight, and another 45, to turn a corner in the layout.
Less flow disturbance than if a single 90 deg elbow was used.

-- Jim, Houston, TX

View ArtMann's profile

ArtMann

1043 posts in 933 days


#4 posted 03-14-2018 04:12 PM

I hope I am understanding you correctly. If the other blast gates are closed, the dust collector won’t be pulling any air through those hoses. After a momentary pressure drop, the air will be still unless you have a leak. You may be going to a lot of trouble locating the gates in inconvenient places for not much benefit.

View AZWoody's profile

AZWoody

1396 posts in 1341 days


#5 posted 03-14-2018 04:24 PM

In my opinion you only need a blast gate at the point of the machine or from the transition of hard pipe to hose.
That’s where I have mine. If there is a blast gate at every machine, there won’t be any air being pulled from them if they’re closed.

Now, if you split the main trunk into a couple of branches that are long then there is theoretically a benefit of having a gate at the start of each branch but still, the benefit might not be worth the trouble.

As far as gates, they can be made but Clearvue sells 6” clear plastic gates that I use and are well made. They will fit around a 6” S&D pipe perfectly. They also sell transitions that change a 6” to double 4” fittings which works well for table saws and other dual port machines.

If possible, instead of going to 4” to the machines, see if it’s possible to adapt them to 6” and use all the capacity of your blower. The dust collector will pick up much more of the fine particles if you don’t choke it down to 4”

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jimintx

820 posts in 1701 days


#6 posted 03-14-2018 05:16 PM

about time for the flow volume versus flow velocity discussion to break out

-- Jim, Houston, TX

View Redoak49's profile

Redoak49

3450 posts in 2105 days


#7 posted 03-14-2018 05:28 PM

I think a 3 hp dust collector will be fine with 6” duct.

You can look at my blogs and see my 6” ducts and blast gates that I built.

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