Multiple 4 inch lines to second stage dust collector

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Forum topic by RobS888 posted 02-18-2015 04:20 PM 827 views 0 times favorited 2 replies Add to Favorites Watch
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2524 posts in 2086 days

02-18-2015 04:20 PM

I have a Delta 50-760 hooked up to a 50 gallon barrel as a second stage filter/collection unit and it works pretty well, emptied the bag once in 2 1/2 years, the barrel around 8 times. My wife can fill the barrel in about 3 months from her lathe. We have had this set-up for a while, but really only one of us can use it at a time.

When I test the CFMs ( I have a Pyle meter and enter the square inches of the pipe opening/144 to get square feet) going into the barrel via a 5 inch pipe from the DC, I get 500+ CFM, the 4 inch outlet of the barrel read around 300+CFMs. We only get around 150 CFM at any outlet, so I plan on redoing the main pipes.

My question is this: would running 2 separate lines from the DC (it has a 5” to 2x 4” Y connector) to the barrel or just the 5 ” pipe then 2 separate 4” lines . I plan on having 2 lines from the barrel running to 2 different area, 25’ at most in either case, just not sure what the best way between the DC and barrel would be. It seem that having 4 openings 2 in and 2 out would be less efficient than a 5” in and 2×4” out.

Anyone ever tried using more than one line out of a barrel or separator?

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

2 replies so far

View bobkberg's profile


439 posts in 3314 days

#1 posted 03-08-2015 07:10 PM

Hi Rob,

You didn’t specify whether or not you are using any corrugated tubing for the DC as opposed to smooth pipe, but that could also drop your CFM from turbulence. Additionally, the distance of piping will cut down on your effective CFM from simple air friction.

It sounds like you may want to consider the total effective distance of your DC piping and relocate where the dust collector sits. The other tradeoff is that when you widen the piping, it drops the speed of the airflow which may not be enough to keep the debris suspended in mid-air.

Hopefully, you have good blast gates to keep air loss from leaks to a minimum. I hope that’s of some help.

-- Bob - A sideline, not how I earn a living

View RobS888's profile


2524 posts in 2086 days

#2 posted 03-17-2015 08:10 PM

Thanks Bob,

The DC goes under the stairs in its own room, so the distances are set. I have smooth walled rigid pipe for most of the run maybe 18 feet..

I’ve put the 4 inch hoses back on the DC and get 440CFM from the 10 foot smooth one and 320 from the 25 foot ribbed one. I was getting 500 via the 5 inch hose. So so far it looks like I will get better performance from 2 separate 4 inch lines then one 4 inch line split to go in 2 directions. I’m actually going to try hooking the 2 4 inch lines to the 1st stage (55 gallon barrel) and then see what I get out of the 2 inlets. Did I say that correctly? 2 lines from DC to barrel then 2 lines to machines. trying to get the maximum to my wife’s lathe, then the rest for me.

So if most 1st stages have an inlet and an outlet, I’m going to try having 2 inlets and 2 outlets.

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

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