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<font face="Arial">I agree with most of what Bob says, but with a
major caveat.<br>
<br>
For some gases like arsine and phospine (probably not silane -
it's too reactive), if you get above a certain level of material,
you will potentially be on a list maintained by the US Department
of Homeland Security. If you are threatened to be on that DHS list
you will have two options, to my understanding:<br>
<br>
a) Get rid of enough material to get below their thresholds (which
is what we did at Ohio State with a III-V MOCVD installation,
losing $$$ of pure gas, installed in the spirit below, which is
that cylinder change-outs are the most danger);<br>
<br>
b) Install a perimeter fence around your building and furnish a
24/7 armed guard.<br>
<br>
luck to all<br>
<br>
Bob Davis<br>
Director, Ohio State Nanotech West Lab<br>
<br>
</font>
<div class="moz-cite-prefix">On 1/7/2015 2:32 PM, Bob Hamilton
wrote:<br>
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<blockquote cite="mid:54AD89DD.6090803@berkeley.edu" type="cite">
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Fab Colleagues,<br>
<br>
I'll add, as a general policy about gas cylinder safety, given
modern gas cabinets, toxic gas monitoring systems and
orbitally-welded distribution the most likely time for a
corrosive, pyrophoric or toxic gas incident to occur is during a
cylinder change-out. <br>
<br>
My statement draws on presentations by Eugene Ngai who is often
described as the "silane guru". Retired chemical eningeer Eugene
Ngai has done an excellent job of documenting silane incidents and
safety practices. <br>
<br>
Arguing for smaller quantities of dangerous gases is in many cases
an argument for less safety.<br>
<br>
Bob Hamilton<br>
<br>
<pre class="moz-signature" cols="72">--
Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Equipment Eng. Mgr.
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:bob@eecs.berkeley.edu">bob@eecs.berkeley.edu</a>
Phone: 510-809-8600
Mobile: 510-325-7557 (Emergencies only poor cell phone service in lab)e-mail preferred
</pre>
<br>
<br>
<div class="moz-cite-prefix">On 1/7/2015 9:04 AM, Dennis Schweiger
wrote:<br>
</div>
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cite="mid:CAKzi2_NBMvS7SyyhGdVhwBs3vjpS4-znUJNpEGmtkRzvr78zLw@mail.gmail.com"
type="cite">
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<div dir="ltr">Matthie,
<div><br>
</div>
<div>good morning. Here at UofMichigan, we have two cylinders
on-line, both are about 40 cubic feet. We also have a
single spare cylinder in storage. Our current cadence for
change-out is about every 8 months. It can vary +/- 2
months with usage.</div>
<div class="gmail_extra"><br>
<div>
<div class="gmail_signature">
<div>Dennis Schweiger</div>
<div>University of Michigan/LNF</div>
<div> </div>
<div>734.647.2055 Ofc<br>
</div>
</div>
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<br>
<div class="gmail_quote">On Tue, Jan 6, 2015 at 4:30 PM,
Matthieu Nannini, Dr. <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:matthieu.nannini@mcgill.ca"
target="_blank">matthieu.nannini@mcgill.ca</a>></span>
wrote:<br>
<blockquote class="gmail_quote">Dear colleagues,<br>
<br>
first of all, happy new year to all of you ! May the
force be with you all !<br>
<br>
My EHS dept. would like to compare quantity of silane on
site in different labs. So, if you can spare 30s to
answer those 2 questions then you can go chasing the
student that left the evaporator at atmosphere during
christmas:<br>
- how much silane do you use yearly ?<br>
- what is the cylinder volume you have ?<br>
<br>
cheers<br>
<br>
Matthieu<br>
McGill Nanotools<br>
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