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Hi Maxime,<br>
<br>
Pre-mix supply system assembly can happen in 1-3 days after all
pressure systems requirements have been completed, as long as all
components are in house.<br>
<br>
It's the pressure system requirements that require a long lead time.
More time is also required if we need to order anything such as
orifices or relief valves that have lead times.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 9/10/2017 10:38 PM, mdefurne wrote:<br>
</div>
<blockquote type="cite"
cite="mid:39f6770f-9f2f-49f7-4b0b-e1285fa4d90b@jlab.org">
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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>
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<blockquote type="cite"
cite="mid:3a314958-6b65-a9d5-8f67-b49556f1485a@jlab.org">
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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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<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">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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