Checking for D.C. Air leaks.

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Forum topic by leftcoaster posted 03-16-2017 05:49 PM 727 views 0 times favorited 6 replies Add to Favorites Watch
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229 posts in 1024 days

03-16-2017 05:49 PM

I have a new laguna c|flux 1.5 for one machine at a time. I’ve plumber ABS 4” pipe on the ceiling with blast gates. The D.C. Is connected with a 10’ flex hose so I can pull it out for maintenance. It’s a lot of hose for normal use and drops straight off the D.C. Before doing a 170 degree turn back up to the ceiling.

The abs goes immediately into a wye. All other turns are long 45s.longest distance to a blast gate is 25 feet. Shortest is 10 feet.

CFM feels weak though I am getting most of it.

Are there easy tests for leaks at the friction fit points? I have not used tape or caulk.

Is that flex hose bend at the start a giant problem? Should I shorten the hose and add a quick disconnect for maintenance? Other suggestions? I’d rather not jump to the 6” pipe everywhere right away please.

6 replies so far

View Andre's profile


2068 posts in 1954 days

#1 posted 03-16-2017 08:01 PM

I went with 2 – 4” runs of the machine, hard piped to every machine with gates except my planer(only moveable machine)
my jointer(6” Laguna) has a short(24”) flex connector to allow some movement when doing longer pieces.
Jointer and Tablesaw share a Veritas dust collector(hard piped).
My air flow measured in CFMs actually increased from running only flex hose, long way of saying get rid of as much flex hose as possible!

-- Lifting one end of the plank.

View leftcoaster's profile


229 posts in 1024 days

#2 posted 03-16-2017 09:09 PM

First of all you guys are awesome. So much good advice!

I grabbed a rockler quick fit handle and am going to use that to lose the extra flex hose while still giving me the disconnect. If that’s not enough I will do a smoke test – cigar is hilarious and appealing. If that doesn’t do it I have some more flex I can optimize out.

View TungOil's profile


1034 posts in 643 days

#3 posted 03-16-2017 10:09 PM

Agree with Andre- I’d start by reducing as much of that flex hose as possible. Maybe as a test you could connect the shortest possible length and see if performance improves. That stuff is really a flow killer.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View Mike_D_S's profile


482 posts in 2362 days

#4 posted 03-23-2017 03:02 AM

While the flex hose itself adds significant pressure compared to hard pipe, the fact you are essentially making a 90 degree bend immediately outside the inlet and then a 180 bend to come back up is not helping you much.

If you use some rough numbers, in that first ten feet of flex hose you have 2.8 in SP (10ft flex x .28 in SP/ft) + 1.5 in SP (3 90s x 0.45 in SP ea). So 4.3 in static pressure just at your DC.

Anything you can do to minimize the flex hose and therefore remove those bends has to help you quite a bit.


-- No honey, that's not new, I've had that forever......

View woodbutcherbynight's profile


5559 posts in 2557 days

#5 posted 03-23-2017 03:21 AM

I can’t help with your set up issues for advice. But to find a leak borrow a fog machine and hook it up, it will show you where they are and quick.
Or buy one for less than 40$

Even if you use it once for this purpose it is a great gag to have around. You can really mess with someone coming to the door with a plume of fog as they reach for the doorbell. LOL

-- Live to tell the stories, they sound better that way.

View DirtyMike's profile


637 posts in 1050 days

#6 posted 03-23-2017 04:51 AM

go buy a cheap cigar and let the good times roll.

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