[labnetwork] N2 grade for blow guns
Iulian Codreanu
codreanu at UDel.Edu
Mon Jan 14 10:25:29 EST 2013
Dear Colleagues,
Thank you very much for your feedback.
As some of you have pointed out, it would be helpful to be more specific
about the N2 grades I mentioned.
I have what I call utility N2 already installed and I am designing the
high purity system:
- Utility N2 runs in CFOS Cu piping and is shared with the rest of the
building; at best I can expect 99.999% entering that piping system from
the bulk N2 system.
- High purity N2 (99.9999%) will be generated using purifiers (I am
debating central purification vs. distributed [per chase purifiers]) and
will run in electropolished, orbitally welded 316L stainless steel
downstream of the purifiers. The purifies will be fed from the same
bulk N2 system but the pipe run (CFOS Cu) will be dedicated to the
cleanroom.
The bulk N2 system I have is not stainless steel and it does NOT have
filters after the vaporizers.
My thinking is similar to Dennis Schweiger's, i.e. anything that touches
the product should be high purity.
Iulian
iulian Codreanu, Ph.D.
Director of Operations, UD Nanofab
149 Evans Hall
Newark, DE 19716
302-831-2784
On 1/12/2013 1:29 PM, Lynn Rathbun wrote:
> Well, first you would have to define what grades you mean by utility
> nitrogen and high purity nitrogen.
>
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