<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi Manish,</p>
<p>I tend to concur with that statement. We leave all of our gases
on 24/7 and we have automatic shut-offs on the toxics if there are
issues (gas leak, power loss, excess flow, etc.). We only close
the valve when we are changing cylinders, and that is followed by
leak checks in case there is a valve failure. Constant use of the
valves is a potential failure point, though I'm sure the cylinders
are built for it.</p>
<p>Thanks,<br>
Nathanael<br>
</p>
<div class="moz-cite-prefix">On 2020-12-04 2:11 p.m., Manish Keswani
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:DC751C50-C65F-48DF-8198-848F0BB70786@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div dir="ltr"><span></span>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;">Happy Friday everyone,<o:p></o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;"><br>
</p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;">I have a question related to toxic gases in our
nano fabrication center.</p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;"><o:p> </o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; 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.<o:p></o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;"><o:p> </o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; 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.”<o:p></o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;"><o:p> </o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;"><o:p> </o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;">Thanks in advance,<o:p></o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;">Manish Keswani<o:p></o:p></p>
<p class="MsoNormal" style="-webkit-text-size-adjust: auto;
margin: 0in; font-size: 11pt; font-family: Calibri,
sans-serif;">Lawrence Livermore National Laboratory</p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
labnetwork mailing list
<a class="moz-txt-link-abbreviated" href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>
<a class="moz-txt-link-freetext" href="https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork">https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork</a>
</pre>
</blockquote>
</body>
</html>