[labnetwork] Recirculating DI water spray guns?

[Dennis Schweiger]

Mary,

I don't understand your question.  If you're recirculating the water in the
guns, you're not really losing it, it's just being returned to the storage
tank to be polished and sent back out on your DI loop.  Or, are your guns
"bleeding" water off to drain to keep the water at the nozzle "fresh"?

Here at UofM, all of the newer wet benches have recirculating guns.  The
older benches are just single pass (and these are gradually being
replaced).  There doesn't appear to be any problems with the older style
operation.  The thing to remember is that you're building a fab for the
future, at some point you may need the cleanliness that recirculation
offers.  If your benches aren't set up that way now, modifying them, or
replacing them, to get that functionality at a later date is expensive.

Thanks,
Dennis Schweiger
Facilities Manager
Lurie Nanofabrication Facility
Unifersity of Michigan

734.647.2055 Ofc

On Thu, Jan 17, 2013 at 2:09 PM, Mary Tang <mtang at stanford.edu> wrote:

> Dear labnetwork members --
>
> Our wet benches have "recirculating" DI guns to avoid stagnant water
> lines.  WIth 10 wet benches, this adds up to 50K gallons of DI water each
> year.  We are in the process of replacing our wet benches.  All of the wet
> bench providers we've spoken with have said that most of their customers
> are choosing to use non-recirculating DI spray guns to save water.   But I
> wonder if this may be feasible in certain lab environments.  Does anyone
> have advice and insight to offer?
>
> Mary
>
> --
> Mary X. Tang, Ph.D.
> Stanford Nanofabrication Facility
> Paul G. Allen Room 136, Mail Code 4070
> Stanford, CA  94305
> (650)723-9980
> mtang at stanford.edu
> http://snf.stanford.edu
>
>
>
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