<div dir="ltr"><div dir="ltr">Thanks Shimon for your response. We have sensors at multiple locations (for the same gas) in the cleanroom so if one sensor fails, other sensors would be able to detect the leak. However, if there is only one sensor for a gas, I understand the risk if that sensor fails. </div><div dir="ltr"><br></div><div dir="ltr">We have annual maintenance of the TGM system during which time the sensors are tested. I may have to reach out to Hoenywell to understand how this testing is done and what happens if one or more sensors stop working.</div><div dir="ltr"><br></div><div>Happy holidays to everyone!</div><div><br></div><div>Manish</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Dec 16, 2020 at 12:55 AM Shimon Eliav <<a href="mailto:shimonel@savion.huji.ac.il">shimonel@savion.huji.ac.il</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi Manish,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">From time it is nice to hear what others are doing related to safety issues.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">The summary table you sent us about toxic gases lines made me think: perhaps am I exaggerating on my protocol? A legitimate question after being the only one
closing the gas lines in the end of the day. This question remained “in the corner of my mind” since then.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">We periodically check our leak sensors. Yesterday we received the results of the last check: two sensors need to be replaced. They were not responsive at all.
Once I received those results I got the answer to that question in my mind: our protocol is solid! It builds one more layer of protection over the one depending on the leak sensors.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">When the clean room is closed, the poison/corrosive gas lines are empty. When those lines is under use, we have portable sensors near the user(s), in case of
leak and the building leak sensors fail, the user will shut down all the gas lines using the emergency shutdown button nearby.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">I can soundly sleep in the night
</span><span style="font-size:11pt;font-family:Wingdings;color:rgb(31,73,125)">J</span><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">I take this opportunity to wish everybody Merry Christmas and Happy New Year!!!<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Shimon<u></u><u></u></span></p>
<p class="MsoNormal"><a name="m_-1123242307504813375__MailEndCompose"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></a></p>
<p class="MsoNormal"><b><span style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt;font-family:Calibri,sans-serif"> <a href="mailto:labnetwork-bounces@mtl.mit.edu" target="_blank">labnetwork-bounces@mtl.mit.edu</a> [mailto:<a href="mailto:labnetwork-bounces@mtl.mit.edu" target="_blank">labnetwork-bounces@mtl.mit.edu</a>]
<b>On Behalf Of </b>Manish Keswani<br>
<b>Sent:</b> Sunday, 6 December 2020 22:26<br>
<b>To:</b> <a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> Re: [labnetwork] Toxic gases<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif">Thank you so much everyone for such an enthusiastic response. It seems clear that at most facilities (if not
all), the gas cylinders are always kept open. We also have TGMS in our cleanroom which allows monitoring of the toxic gases at multiple locations (source and delivery point) and will shut off the ESO valve in the event of a leak.
<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif">We will work with our safety and ES&H teams to change our current practice of turning off the gases when not in
use.<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif"> <u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif">Regards,<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif">Manish <u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><img width="780" height="1076" id="gmail-m_-1123242307504813375Picture_x0020_1" src="cid:176843f150e5b16b21" alt="image.png"><u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:8pt;line-height:105%"><span style="font-size:11pt;line-height:105%;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
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<p class="MsoNormal">On Fri, Dec 4, 2020 at 2:11 PM Manish Keswani <<a href="mailto:manish.keswani01@gmail.com" target="_blank">manish.keswani01@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Happy Friday everyone,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">I have a question related to toxic gases in our nano fabrication center.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">We typically shut off our toxic gases at the source when not in use, using the in line valves on the Safety Manifolds, the ESO valves, and the cylinder valve. This is to comply
with the administrative control stated in our gas safety notes. The following question came up for toxic gases. I would like to understand how this is being done at other facilities and the reasoning behind it.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">“Is there a good reason we turn off the toxic gases at the end of the day instead of just leaving them on? It seems like if there is a risk, it would be wear and tear on the
valves etc, plus someone going in vault often to do it.”<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Thanks in advance,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Manish Keswani<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Lawrence Livermore National Laboratory<u></u><u></u></span></p>
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