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March 2004

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Subject:
From:
Lee Whiteman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 10 Mar 2004 09:33:17 -0500
Content-Type:
text/plain
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text/plain (70 lines)
Dave,

In a prior life, we considered putting in a nitrogen generator, using
shop air. Our shop air was terrible, with oils, water, and metals, so we
never tried it. If you trust your shop air, then my gut tells me to go
for it. You may want to consider adding some level of filtration to
clean out the air lines.

I remember that some equipment manufacturers had nitrogen generators
that can provide nitrogen at various levels of purity. However, that
also depends on your nitrogen consumption. I remember meeting somebody
(APEX?, IPC Works?) who made it work in his facility so I know it is
feasible.

Lee


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Hillman
Sent: Tuesday, March 09, 2004 1:00 PM
To: [log in to unmask]
Subject: [TN] Nitrogen Purity Question/Survey

Hi folks! Question for those folks using nitrogen for an inert
atmosphere
in their reflow processes or as a blanket gas on their wave solder
processes. Cryogenic nitrogen is typically 99.998% purity (in terms of
O2
content). On-site nitrogen generation equipment can deliver N2 gas
ranging
from 99.5% to 99.99% purity (again, in terms of O2 content). What gas
purity level are you using in your processes and do you have a rationale
for selecting that purity level?  The reason for the question is that I
am
involved in an exercise of comparing on-site nitrogen generation versus
cryogenic nitrogen supplies.

Thanks in advance for you assistance.

Dave Hillman
Rockwell Collins
[log in to unmask]

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