<div dir="ltr">A couple of items that no one has yet mentioned, or at least I haven't seen them, are;<div><br></div><div>1) The installation of an RFO (Restrictive Flow Orifice) at the cylinder connection. This is just another level of protection/safety, that minimizes the exposure risk in the event that there is a failure. Especially in the higher cylinder pressure gases, like Silane, Arsine, and Phosphine. These can be either installed at your vendors facility (best practice, but you have to be confident of the size), or can be installed at the time of cylinder installation.</div><div><br></div><div>2) The use of DISS cylinder connections for all HPM gases, versus the use of CGA. The DISS, with it's gasket interface, is by far the best choice for any HPM gas.</div><div><br></div><div>About two years ago we were visited/audited by DHS because of the combination of gases we had on hand. It wasn't the pure gases that put us on the list, but the premixes for the HPM's, the Silane/Phosphine dopants to be exact. There were some additional things we had to do to become "more compliant" (three levels of security on the cylinders, primary key card access, chain of custody documentation, limiting the number of individuals that can access cylinders, etc..), all of them were relatively small changes in our "handling of HPM's, and some we already had in place.</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div>DennisSchweiger</div><div>University of Michigan/LNF</div><div> </div><div>734.647.2055 Ofc</div><div> </div><div>"People can be divided into 3 groups - those that make things happen, those that watch things happen, and those that wonder what happened." Within which group do you belong?</div></div></div>
<br><div class="gmail_quote">On Wed, Jan 7, 2015 at 4:24 PM, Matthieu Nannini, Dr. <span dir="ltr"><<a href="mailto:matthieu.nannini@mcgill.ca" target="_blank">matthieu.nannini@mcgill.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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 href="mailto:roberthamilton@berkeley.edu" target="_blank">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.
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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.
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Arguing for smaller quantities of dangerous gases is in many cases an argument for less safety.<br>
<br>
Bob Hamilton<br>
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Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Equipment Eng. Mgr.
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
<a href="mailto:bob@eecs.berkeley.edu" target="_blank">bob@eecs.berkeley.edu</a>
Phone: <a href="tel:510-809-8600" value="+15108098600" target="_blank">510-809-8600</a>
Mobile: <a href="tel:510-325-7557" value="+15103257557" target="_blank">510-325-7557</a> (Emergencies only poor cell phone service in lab)e-mail preferred
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<div>On 1/7/2015 9:04 AM, Dennis Schweiger wrote:<br>
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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>
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<div>Dennis Schweiger</div>
<div>University of Michigan/LNF</div>
<div> </div>
<div><a href="tel:734.647.2055" value="+17346472055" target="_blank">734.647.2055</a> Ofc<br>
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<div class="gmail_quote">On Tue, Jan 6, 2015 at 4:30 PM, Matthieu Nannini, Dr. <span dir="ltr">
<<a 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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