Hey....
As a board fabricator we require dry air in almost every process
area, including electrical test. I've had water pouring out of
backplanes on my flying probes.... The issue with dry air becomes
multilayered
as there are so many variables.
Is the chiller/dryer capable of the volume (CFM) you are drawing.
What kind of air lines are you running? Maintenance folk love
galvanized pipe.... unfortunately, condensation is a big problem.
Copper is better, but more expensive, and a big pain to install.
Plastic is not reliable and/or may not be consistent with local
building codes.
Install lots of filters......place them in line so you can bypass the
filter when you change the cartridges (to avoid shutting the air system)
piece of equipment, we run fine micron filters and positive pressure traps.
These type of traps are constantly draining the lines into water drains or
catch
basins... and then we put one more filter just before the air intakes of the
equipment.
The last issue is your environment..... during our rainy season or during
unusally humid weather, we can not produce enough dry air. It's real fun on
those
type of days... We have the PM crew perform hourly inspections of the major
water traps.
Jim
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen R. Gregory
Sent: Friday, April 20, 2001 8:31 PM
To: [log in to unmask]
Subject: [TN] Compressed Air...
Hi All,
I've become involved with our facility compressed air. We seem (in my
opinion) to have an excessive amount of moisture in our air lines. There is
an air dryer installed downstream from the compressor, but the water traps
that are installed at various locations on the production floor need to be
drained regularly (sometimes daily).
My take on this is that the air drier that we have either isn't functioning
properly, or that it doesn't have the capacity that we need for the demand
of
air that we require.
I'm being told by our "Plant Engineer" that there isn't anything out there
that will eliminate the moisture from our compressed air lines, he says
we're
always going to have water in our compressed air lines...I beg to differ
with
his opinion.
Would any of you please post something that says that it is possible to have
clean, dry, compressed air on your production floor? This is air that is
supplied for our automation, and everything else.....
I know that this is possible, I've worked at too many other companies where
one of the last things I had to worry about was the quality of our
compressed
air, but I have a new challenge now...I see water in the traps throughout
the
production floor every single day that need to be drained daily (and other
things that I don't want to get into), but yet I'm told our air drier is
functioning properly, and that it just doesn't get any better....that it's
just physics.
I'm about to go crazy...please help me.
-Steve Gregory-
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