[labnetwork] N2 grade for blow guns

[Iulian Codreanu]

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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