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<font face="Times New Roman, Times, serif">Hey All,<br>
<br>
Here at Harvard CNS, we've got two bottles on line, each in a
"normal" 9x51 inch cylinder. One is 100% SiH4, 6x9's purity, 26
lbs when new (not sure the number of cubic feet). The other is 3%
SiH4 in Argon, 211 c.f.<br>
<br>
These have both been on line for the last 7 years or so, and
probably have a few more years left on them. We have generally
treated expiration dates as more a marketing thing than a
technical issue. It would be interesting to hear of any
experiences folks have had with gas expiration issues. We have
debated going to smaller bottles for these, but the risk balance
seems to be favor large bottles and fewer changes. <br>
<br>
We did reduce our bottle sizes on some other materials due to
Homeland Security concerns...<br>
<br>
<br>
Mac<br>
<br>
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<br>
On 1/7/2015 4:24 PM, Matthieu Nannini, Dr. wrote:
<blockquote
cite="mid:ABE82C3D-34D8-4C46-9652-E91083907D48@mcgill.ca"
type="cite">
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Bob:
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<div>Fully agreed. Most large spectacular accidents that scare the
hell of EHS dept. (at least mine) when they google « silane
safety » are from large PV solar factories where bottle changes
occur much more often that in our academic fabs. As such, danger
there might be underestimated. So smaller quantities leading to
more bottle changes might very well be less secure.</div>
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<div>Matthieu</div>
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<div>Le 2015-01-07 à 14:32, Bob Hamilton <<a
moz-do-not-send="true"
href="mailto:roberthamilton@berkeley.edu">roberthamilton@berkeley.edu</a>>
a écrit :</div>
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<div bgcolor="#FFFFFF" text="#000000">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
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<div class="moz-cite-prefix">On 1/7/2015 9:04 AM, Dennis
Schweiger wrote:<br>
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cite="mid:CAKzi2_NBMvS7SyyhGdVhwBs3vjpS4-znUJNpEGmtkRzvr78zLw@mail.gmail.com"
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<div dir="ltr">Matthie,
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<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>
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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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