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Hi Matt,<br>
<br>
The gas cylinder heater blanket is a stand alone unit. Typically,
the power pigtail is connected to power via a on/off switch. <br>
<br>
With both the gas cylinder and rack internal piping heated, perhaps
insulation alone will suffice on the line between the C4H10 cylinder
and rack enclosure. Alternatively, the end section of the line used
to heat the enclosure could be used to heat the c4h10 line.<br>
<br>
A heater cable will require it's own switch or plug on a ground
fault protection circuit. The heater cable will require a
thermostat. A thermostat such as Cromalox E121 to control heater
cable such as Cromalox HSRL low temp self regulating cable. The
Target tanks utilize this type of temperature control.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 9/14/2017 11:34 AM, Matthew Marchlik
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1618821666.7687302.1505403249477.JavaMail.zimbra@jlab.org">
<pre wrap="">Hi Marc,
I met with Walt Akers, Tim Minga and Paul Powers this morning to discuss installation of the system into 96B. The consensus is that there is not way to modify the shed for flammable gas service without spending significant time and money. Installing into 96C, hall C's gas shed, was also discussed but would not work out.
So, the mixing system and gas supply bottles will be installed on the gas pad. Could you please reply to this email and list the items/steps necessary for installation from DSG's standpoint we discussed yesterday?
Hall B will create a small insulated foam box to house the MFCs with a segment of directly controlled heat tape within to keep the temperature above 50F. It will have holes for the cables. Is there any need to regularly access the MFCs after commissioning?
The C4H10 line from the bottle to the MFCs will need to be wrapped with insulation and heat tape set to 90F, same as the bottle blanket. (George, can this be powered/controlled in series with the heater blanket?)
Hall B and I will update all of the PS documentation, drawings, models and P&IDs.
Thanks,
Matt
----- Original Message -----
From: "Marc McMullen" <a class="moz-txt-link-rfc2396E" href="mailto:mcmullen@jlab.org"><mcmullen@jlab.org></a>
To: "Matthew Marchlik" <a class="moz-txt-link-rfc2396E" href="mailto:marchlik@jlab.org"><marchlik@jlab.org></a>, "Bob Miller" <a class="moz-txt-link-rfc2396E" href="mailto:rmiller@jlab.org"><rmiller@jlab.org></a>, <a class="moz-txt-link-abbreviated" href="mailto:dsg-mvt@jlab.org">dsg-mvt@jlab.org</a>
Sent: Wednesday, September 6, 2017 3:53:29 PM
Subject: MVT gas mixing electronics/network equipment
Hi Matt and Bob,
Is there a firm plan on the location of the MVT mixing instrumentation,
electronics, and network equipment. If the equipment cannot be located
in the Hall, I understand that the gas pad may be the next logical
choice. The instrumentation which will have to be at the gas panel are
the MFCs, which are temperature sensitive. The MFCs communicate via the
network, so under normal circumstances we would like to have a switch at
the location. We would also like to put the power for the MFCs (a
chassis containing a power supply) in that location if possible. To
house all of these components, may require large enclosure, or rack
which can be enclosed and climate controlled to keep all components
running and in good shape for the long run. At any rate, please let us
(DSG) know as soon as a decision is made, so that we can plan accordingly.
Thanks,
</pre>
</blockquote>
<br>
<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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