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Matt:<br>
<br>
While our facility is older than most, we have lots of bent SS
coaxial lines. We have a total of about 12 coaxial lines going from
our bunkers into our clean room. My guess is that we have on the
order of 100 coaxial 90 degree bends before our lines enter the
building, another 100 as they are routed under our subfab, and
probably another 25-50 once they are in the clean room. In the
great majority of cases, these were bent on a 1 1/2" radius mandel
... even though I suspect that new facilities will have used a
larger radius bender. Note: while we have a handful of welded tees,
I don't believe that we have a single welded coaxial elbow.<br>
<br>
A simple test would be to bend a piece of 1/4" tubing (well,
possibly the 6 mm ...) in a tubing bender with a 1/2" mandrel (or
metric equivalent). I presume that you are worried about kinking,
but I believe that you'll find that the 1/2" mandrel works fine on
the smaller diameter tubing and that when you are bending coaxial
tubing, the inner wall of the larger diameter tubing (which is
typically 0.0.98" (over 2 mm) smaller than the 1/2" mandrel) serves
as the mandrel for the inner tubing.<br>
<br>
At least that is our experience. Good luck,<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 12/16/2014 8:33 PM, Matthieu
Nannini, Dr. wrote:<br>
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<div style="word-wrap:break-word">Dear colleagues,
<div><br>
</div>
<div>A local company is proposing to bend coaxial SS tubing to
install a double containment gas line thus removing the need
for welded 90° elbows. did you ever see that ? Any comment
would be helpful ! </div>
<div><br>
</div>
<div>Thanks</div>
<div><br>
</div>
<div>Matthieu Nannini<br>
<div><br>
<div>Début du message réexpédié :</div>
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<span style="font-family:'Helvetica'"><b>De: </b></span><span
style="font-family:'Helvetica'">"Matthieu Nannini,
Dr." <<a moz-do-not-send="true"
href="mailto:matthieu.nannini@mcgill.ca">matthieu.nannini@mcgill.ca</a>><br>
</span></div>
<div style="margin-top:0px; margin-right:0px;
margin-bottom:0px; margin-left:0px">
<span style="font-family:'Helvetica'"><b>Objet: </b></span><span
style="font-family:'Helvetica'"><b>Bending coaxial</b><br>
</span></div>
<div style="margin-top:0px; margin-right:0px;
margin-bottom:0px; margin-left:0px">
<span style="font-family:'Helvetica'"><b>Date: </b></span><span
style="font-family:'Helvetica'">15 décembre 2014
15:31:10 UTC−5<br>
</span></div>
<div style="margin-top:0px; margin-right:0px;
margin-bottom:0px; margin-left:0px">
<span style="font-family:'Helvetica'"><b>À: </b></span><span
style="font-family:'Helvetica'">Tom Britton <<a
moz-do-not-send="true"
href="mailto:tbritton@criticalsystemsinc.com">tbritton@criticalsystemsinc.com</a>><br>
</span></div>
<br>
<div>Hi tom,<br>
<br>
A local company here can bend coaxial tubing. They
quoted me 4800$ for the 2 lines BCl3 and SiCl4.<br>
<br>
What do you think of bending ? They told me the 1/4
wasn’t kinked at all.<br>
<br>
Matthieu<br>
<br>
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