<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Wingdings 2";
panose-1:5 2 1 2 1 5 7 7 7 7;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hello Kamal<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I’d like to add my view as a certified welding engineer to this. Not about the piping, but the welding.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">It should be considered an essential requirement if making a pressurized system to be using certified procedures, welders and equipment. The standards ASME IX, ASME B31.3 and
SEMI 81:1103 all detail the requirements needed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">If they require certified procedures, welders and equipment in industries like dairy or pharmaceutical, then for certain it should be considered the pre-requisite for piping
with gases as toxic as these.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">International Welding Engineer IWE/GB/00273<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#17365D;mso-fareast-language:EN-AU">Simon Doe
</span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#17365D;mso-fareast-language:EN-AU">Facility Manager, Australian National Fabrication Facility-SA
Node</span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#17365D;mso-fareast-language:EN-AU">University of South Australia | Mawson Lakes SA 5095</span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.0pt;font-family:"Wingdings 2";color:gray;mso-fareast-language:EN-AU">'</span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#17365D;mso-fareast-language:EN-AU">:
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><a href="tel:%2B61%208%208302%205226" target="_blank"><span lang="EN-AU">+61 8 8302 5226</span></a><span style="color:#17365D">
</span></span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#17365D;mso-fareast-language:EN-AU">|
</span><span lang="EN-AU" style="font-size:10.0pt;font-family:Wingdings;color:gray;mso-fareast-language:EN-AU">*</span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#17365D;mso-fareast-language:EN-AU">:
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><a href="mailto:simon.doe@unisa.edu.au" target="_blank"><span lang="EN-AU">simon.doe@unisa.edu.au</span></a><span style="color:#17365D">
</span></span><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-AU"><a href="http://www.anff-sa.com/">www.anff-sa.com</a><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> labnetwork-bounces@mtl.mit.edu <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Leif Steen Johansen<br>
<b>Sent:</b> Tuesday, 15 September 2020 5:43 AM<br>
<b>To:</b> Kamal Yadav <kamal.yadav@gmail.com>; labnetwork@mtl.mit.edu<br>
<b>Subject:</b> Re: [labnetwork] Toxic Gases tubing<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="DA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hello Kamal,
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Like University of Michigan we also run all toxic and pyrophoric gases in coaxial pipes. The inner pipe is made of electro polished 316L stainless steel with
a surface roughness of 0.25μm. All welding is orbital welding performed by certified welders using certified equipment. We allow our welders to bend the tubes with a dedicated tool. Some sites don’t allow this, since this theoretically could cause a larger
surface roughness in the bends. Such sites buy pre-made bends that are welded onto the straight pipes.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The outer pipe of the coax line is monitored for gas leaks. We have two systems: One system constantly pumps on the outer pipe and monitors the pumped air for
toxics. In the other type of system the outer pipe is pumped to vacuum, sealed off, and then monitored by a vacuum gauge. A coax monitor alarm (sensed gas or loss of vacuum in outer pipe) automatically shuts down the gas line, evacuates the building and calls
the fire brigade. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">All connections are of the VCR type and are placed inside a vented and gas monitored enclosure.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We have all the four gases you mention, and all of them are nasty in their own way, so please take good care of yourself.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best regards,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Leif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="400" style="width:300.0pt">
<tbody>
<tr>
<td width="400" style="width:300.0pt;padding:0cm 0cm 0cm 0cm">
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="400" style="width:300.0pt;border-collapse:collapse">
<tbody>
<tr>
<td width="50" valign="top" style="width:37.5pt;padding:0cm 0cm 0cm 0cm">
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="50" style="width:37.5pt">
<tbody>
<tr>
<td width="50" valign="top" style="width:37.5pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><span style="color:#1F497D"><img border="0" width="36" height="53" style="width:.375in;height:.552in" id="_x0000_i1025" src="http://www.dtu.dk/-/media/DTU_Generelt/Andet/mail-signature-logo.png" alt="http://www.dtu.dk/-/media/DTU_Generelt/Andet/mail-signature-logo.png"><o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
</td>
<td width="350" valign="top" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="350" style="width:262.5pt;border-collapse:collapse">
<tbody>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:120%"><b><span style="font-family:"Arial",sans-serif;color:black">Leif Steen Johansen<o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Head of Operations, Ph.D.<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Dir. +45 45 25 57 13<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Mob. +45 25 34 89 92<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"><a href="mailto:lesjo@dtu.dk"><span style="color:black;text-decoration:none">lesjo@dtu.dk</span></a>
<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Ørsteds Plads, Byg. 347<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Building 347<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">2800 Lyngby<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width="350" style="width:262.5pt;padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"><a href="https://www.dtu.dk/english"><span style="color:black;text-decoration:none">www.dtu.dk/english</span></a>
<o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">
<a href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a> <<a href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a>>
<b>On Behalf Of </b>Kamal Yadav<br>
<b>Sent:</b> 14. september 2020 18:43<br>
<b>To:</b> <a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> [labnetwork] Toxic Gases tubing<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Dear All,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">We will be installing SS gas tubing for Cl2, BCl3, HBr, SiH4.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">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<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">My queries are: <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">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]. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">2. Also if you do orbital welding or just bending of the tubes?<br clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I have been informed it is based on the fire code of the city or county, but it's not apparent from those documents.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks for your help.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Kamal <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>