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<p>Hi Kamal,</p>
<p>We used electropolished SS for all of our high purity gas lines.
Double wall was used for all toxics, including Cl2, BCl3, and
SiH4. The sheath is exhausted through the gas cabinet so we can
sense any leaks. I believe that it is a combination of welded and
bends depending on the area. We didn't end up heat wrapping any
of the lines.</p>
<p>Our worksafe code doesn't appear to specify double-walls, but as
far as I know it is best practices.</p>
<p><a class="moz-txt-link-freetext" href="https://www.worksafebc.com/en/law-policy/occupational-health-safety/searchable-ohs-regulation/ohs-regulation/part-06-substance-specific-requirements#SectionNumber:6.116">https://www.worksafebc.com/en/law-policy/occupational-health-safety/searchable-ohs-regulation/ohs-regulation/part-06-substance-specific-requirements#SectionNumber:6.116</a><br>
</p>
<p>I hope that helps!</p>
<p>Thanks,</p>
<p>Nathanael<br>
</p>
<div class="moz-cite-prefix">On 2020-09-14 12:02 p.m., Kamal Yadav
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAOfoCyhT-_sC_xCeG2ncHVMMOLKGF_7hLUxaqvMsNgDWkckfag@mail.gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div dir="ltr">Dear All,
<div><br>
</div>
<div>Another query in continuation for gas tubing-</div>
<div><br>
</div>
<div>3. How does heat trace constraint impact choosing of single
of double contained tubing for Cl2/BCl3. Is the heat tracing
as effective on double contained tubing as single. Is the need
for heat trace tube length dependent.</div>
<div>4. All process gases with 5N or higher purity are with
electropolished tubings?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Kamal</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Sep 14, 2020 at 9:43
AM Kamal Yadav <<a href="mailto:kamal.yadav@gmail.com"
moz-do-not-send="true">kamal.yadav@gmail.com</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">
<div dir="ltr">Dear All,
<div><br>
</div>
<div>We will be installing SS gas tubing for Cl2, BCl3, HBr,
SiH4.</div>
<div><br>
</div>
<div>I have some experience in how industry does it, but
wanted to know how different universities do this. From
some prior posts, I got to know University of Michigan has
co-axial tubing for all these gases and every connector
location for these gases is exhausted as well at their
facility</div>
<div><br>
</div>
<div>My queries are: </div>
<div>1. Is this how most of the Universities do it or there
are places where these gases are in single tubing [non
co-axial or double contained]. </div>
<div>2. Also if you do orbital welding or just bending of
the tubes?<br clear="all">
<div><br>
</div>
<div>I have been informed it is based on the fire code of
the city or county, but it's not apparent from those
documents.</div>
<div><br>
</div>
<div>Thanks for your help.</div>
<div><br>
</div>
-- <br>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Thanks,<br>
</div>
<div>Kamal </div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Thanks,<br>
</div>
<div>Kamal </div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
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