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<p>Hello,</p>
<p>If this is the most "convenient" back-up system, then I would say
go for it. Nevertheless mixing system must be the priority. If it
can be ready by the time we move the MVT in the Hall, then let's
forget about this pre-mix gas supply.</p>
<p>I do not know the time scale. George, how long do you need to
have this pre-mix system ready? Matt, how long to you need to
approve this system if we need it? If you tell me X days, then
let's check the mixing system status X days before the MVT
installation. If we think the mixing system will be ready, then
there will be no need to spend time on the premix supply in the
Hall. <br>
</p>
<p>Apparently premix bottles will not be ordered anymore. But we
will keep 2-3 of them in case the mixing system is not ready (one
bottle lasts 6 days if no leak between the detector and the
bottle). <br>
</p>
<p>Have a good day,</p>
<p>Maxime<br>
</p>
<br>
<div class="moz-cite-prefix">Le 08/09/2017 à 13:35, George Jacobs a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:3a314958-6b65-a9d5-8f67-b49556f1485a@jlab.org">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
There was a plan earlier this year to test the FT with pre-mix, so
I produced the attached diagram for testing the FT with pre-mix in
the hall at that time. This setup uses the pre-existing lines that
run from the target gas pad to the downstream end of the space
frame. Replacing the FT chassis in the diagram with the MVT
chassis is all that is required to make it the MVT pre-mix gas
supply. This setup is quite similar to the one in EEL rm 124, but
still requires a DA.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 9/8/2017 12:14 PM, mdefurne wrote:<br>
</div>
<blockquote type="cite"
cite="mid:88027a9d-835d-320f-2346-bcb0bd296852@jlab.org">Hi
Marc, <br>
<br>
Thank you for the update. Before inserting the MVT in the
solenoid, we will have to check that everything has been plugged
back properly. To do so, we will need gas. <br>
<br>
A back-up plan will be to have the gas line ready and plug a
premix bottle on it. What is the procedure to follow to have
this back up plan ready for the MVT installation in the Hall?
Unfortunately it is necessary to prepare this back-up plan
because we won t insert the CVT in the solenoid without checking
that everything is OK. <br>
<br>
Kind Regards, <br>
<br>
Maxime <br>
<br>
<br>
Le 08/09/2017 à 10:09, Marc McMullen a écrit : <br>
<blockquote type="cite">Hi Maxime, <br>
<br>
Currently the MVT mixing system is being evaluated by the
Pressure Systems authority and a location is being discussed
by the fire safety authority. If the location is moved
outdoors, consideration must be given for the mass flow
controllers. The controllers purchased are not specified to
operate at a temperature lower than 50F. <br>
<br>
DSG is currently looking into another option for an MFC, while
Hall B is looking into locations and climate control
possibilities for the MFCs. <br>
<br>
With that said, Amrit and I have discussed the possibility for
the mixing system to be completed by 9/15 (possibly not even
10/15) and we think it is not likely. George can provide
further confirmation. If it is necessary to run a premix by
then, that option needs to be expedited. <br>
<br>
Regards, <br>
<br>
Marc <br>
<br>
<br>
<br>
On 9/6/2017 1:41 PM, mdefurne wrote: <br>
<blockquote type="cite">Dear George, <br>
<br>
Will the mixing system be ready for October 1st? If not when
do you expect to have it ready? <br>
<br>
If it is not ready before the 15th, we will absolutely need
the gas line ready so that we can plug a premix bottle to
run tests: We will not be able to enter the CVT in the
solenoid if we do not check the electronics connexion and
gas lines. Indeed, once the CVT inside the solenoid, the
micromegas tiles and disks will not be accessible anymore. <br>
<br>
If there is any administrative paperwork to have a premix
bottle plugged on the gas line, please let me know. <br>
<br>
Thank you, <br>
<br>
Kind regards, <br>
<br>
Maxime <br>
<br>
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<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org" moz-do-not-send="true">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" moz-do-not-send="true">https://userweb.jlab.org/~jacobsg</a></pre>
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