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<p>Dear Amrit,</p>
<p>Thank you for your reply. The 10 premix bottles will be useful
indeed. <br>
</p>
<p>I agree that the temperature for the isobutane must be stabilized
since it is killing MFCs because of the condensation. I noticed
that the insulation has been improved. <br>
</p>
<p>Our premix consumption depends highly on the beam availibility.
We did the last two weeks with only two premix bottles because
accelerator had issues. But I can only hope the beam will be fully
available in January. Using 24/24 premix, one premix bottle is
expected to last 3.5 days. 10 bottles will then last about 5-6
weeks, accounting for some downtime of Hall or accelerator. We
will have to decide quite soon in January which MFCs to buy if
there is nothing we can do before.</p>
<p>Thanks everyone for your help. I wish you all a merry christmas
and see you next year.</p>
<p>Kind regards,</p>
<p>Maxime<br>
</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">Le 20/12/2017 à 17:27, Amrit
Yegneswaran a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:1438354255.168180.1513808874190.JavaMail.zimbra@jlab.org">
<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>hello maxime,<br>
</div>
<div><br data-mce-bogus="1">
</div>
<div>your concerns are understandable.<br data-mce-bogus="1">
</div>
<ol style="list-style-type: undefined;">
<li>Since the C4H10 temperature problem hasn't been solved, by
buying new MFCs nothing is gained. If the gas condenses, the
new MFC will stop working. Right?<br data-mce-bogus="1">
</li>
<li>Even if Marc, whose last day is tomorrow, orders the MFC
tomorrow, the procurement department has to place the order
for the MFCs, which by the time it is done, will be
Januar2018.</li>
<li> Lead time for these MFCs is between 6 and 8 weeks, so the
earliest you can expect them to arrive is mid/end of
February 2018.</li>
<li>C4H10 temp. must be stabilized. On this matter much advise
has been provided by George and much effort has been taken.
<br data-mce-bogus="1">
</li>
<li>Marc has given the spare MFC to be installed. Hopefully,
this works. <br data-mce-bogus="1">
</li>
<li>Upon their return in Jan, 2018, Marc and George will
research other types of MFCs, which hopefully are impervious
to condensation; recall even these will have a lead time of
6-8 weeks.</li>
<li>As a contingency, because the MVT gas system was so, so
delayed, I asked George to order 10 premix bottles in
November. As per Marc, these should arrive mid January. We
can only hope that the come in time for the January run.</li>
<li>For the future, please e-mail your usage days/cylinder, so
that George can order and adequate number of cylinders, at
least until the MFC issue is resolved, or should one say
solved? <br data-mce-bogus="1">
</li>
</ol>
<div>amrit<br data-mce-bogus="1">
</div>
<div> <br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div> <br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Maxime Defurne"
<a class="moz-txt-link-rfc2396E" href="mailto:mdefurne@jlab.org"><mdefurne@jlab.org></a><br>
<b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:dsg-mvt@jlab.org">dsg-mvt@jlab.org</a>, "Bob Miller"
<a class="moz-txt-link-rfc2396E" href="mailto:rmiller@jlab.org"><rmiller@jlab.org></a>, "burkert" <a class="moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org"><burkert@jlab.org></a>,
"Yuri Gotra" <a class="moz-txt-link-rfc2396E" href="mailto:gotra@jlab.org"><gotra@jlab.org></a><br>
<b>Sent: </b>Wednesday, December 20, 2017 4:34:33 PM<br>
<b>Subject: </b>Re: [Dsg-mvt] News about Isobutane MFC<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">
<p>Hi Marc, Hi Bob,<br>
</p>
<p>Thank you for the information. We do not have much time to
think and we need to take quickly action. Indeed SVT is in
critical shape and without Micromegas, the CVT will be
inefficient. If there is no gas for January, it will be a
major issue for CLAS12 commissioning.</p>
<p>Maybe is it better to order these new MFCs resisting to
condensation. How much are they? I think we should do the
maximum to order MFCs before the christmas holiday.<br>
</p>
<p>Maxime<br>
</p>
<br>
<div class="moz-cite-prefix">Le 20/12/2017 à 11:23, Marc
McMullen a écrit :<br>
</div>
<blockquote
cite="mid:1982328490.89036.1513786994953.JavaMail.zimbra@jlab.org">
<div style="font-family: arial, helvetica, sans-serif;
font-size: 12pt; color: #000000"
data-mce-style="font-family: arial, helvetica, sans-serif;
font-size: 12pt; color: #000000;">
<div>Hi Maxime,<br>
</div>
<div><br>
</div>
<div>I have been running argon through the c4h10 mfc which
was removed from the mixing system. It is not
functioning properly after hours of purging. We will
need to replace it. I'll contact MKS today to see if
they will repair it. We need to buy at least two more
(~$1600 per), because I believe the mix 1 c4h10 was not
acting properly and was exposed to condensed gas during
the same time, although to a lesser extent. Testing
shows that the valve will no longer seat, so that if
there is any pressure (10-15psi) the mfc will flow 35 -
50 sccm. If I close off the argon valve at the
regulator, the flow bleeds off, so I believe it's
leaking through the internal valve seat. If the mfc is
mechanically isolated from gas, it measures no flow, so
the sensor seems to be ok. So a repair of the internal
components may be the fastest way to have a second
perfectly running mfc (4 week lead time on purchase). <br>
</div>
<div><br>
</div>
<div>The other focus needs to be on insuring the gas will
not condense in the mfc. You should address this with
the system owner (Bob) and tech (Todd) on the best way
to keep the gas > 70degF. Although the mfcs are
specified to operate down to 50F, the gas may condense
due to the small amount of flow. The mfcs are sized
correctly. So unless there is an objection I will
request the same size. <br>
</div>
<div><br>
</div>
<div>We may also consider going with an mfc which may have
a better recovery from this kind of issue. I read an
article on a different brand which may provide some
solution in the future.<br>
</div>
<div><a class="moz-txt-link-freetext"
href="http://www.alicat.com/alicat-blog/products-and-services/liquid-in-a-gas-flow-controller-how-bad-is-it-doc/"
target="_blank"
data-mce-href="http://www.alicat.com/alicat-blog/products-and-services/liquid-in-a-gas-flow-controller-how-bad-is-it-doc/"
moz-do-not-send="true">http://www.alicat.com/alicat-blog/products-and-services/liquid-in-a-gas-flow-controller-how-bad-is-it-doc/</a><br
data-mce-bogus="1">
</div>
<div><br>
</div>
<div>Finally, I have requested a status update from the
premix vendor. When he responds I'll forward the info.<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Marc McMullen<br>
Physics Division<br>
Detector Support Group<br>
7738</div>
<div><br>
</div>
<hr id="zwchr">
<div><b>From: </b>"mdefurne" <a
class="moz-txt-link-rfc2396E"
href="mailto:mdefurne@jlab.org" target="_blank"
data-mce-href="mailto:mdefurne@jlab.org"
moz-do-not-send="true"><mdefurne@jlab.org></a><br>
<b>To: </b><a class="moz-txt-link-abbreviated"
href="mailto:dsg-mvt@jlab.org" target="_blank"
data-mce-href="mailto:dsg-mvt@jlab.org"
moz-do-not-send="true">dsg-mvt@jlab.org</a><br>
<b>Sent: </b>Tuesday, December 19, 2017 11:26:33 PM<br>
<b>Subject: </b>[Dsg-mvt] News about Isobutane MFC<br>
</div>
<div><br>
</div>
<div>Hi Marc,<br>
<br>
What is the schedule for the mixing system? Let me know
if you need <br>
anything or think I could speed up one or two things.<br>
<br>
We are on the last premix bottle. We have to be ready
for January 12th <br>
with either the gas mixing system or premix bottles
(when will the ten <br>
bottles delivered?).<br>
<br>
Cheers,<br>
<br>
Maxime<br>
<br>
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