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Hi Bob,</div>
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Currently, we don't use any nitrogen purge in the dry boxes.</div>
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The dry boxes themselves have dryers that lower the humidity when the box is powered.</div>
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-Tyler<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Bob Miller <rmiller@jlab.org><br>
<b>Sent:</b> Monday, October 12, 2020 1:30 PM<br>
<b>To:</b> Tyler Lemon <tlemon@jlab.org><br>
<b>Subject:</b> Re: RICH aerogel nitrogen purge during upcoming planned power outage in EEL</font>
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<p>Hi Tyler,</p>
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<p>Please send me a drawing of the current purge system, including the source of N2 that you are using.<br>
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<p>I will need access to the small cleanroom as well, on Wednesday this week.</p>
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<p>Regards,</p>
<p>Bob</p>
<p>822-9586<br>
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<div class="x_moz-cite-prefix">On 10/12/2020 11:49 AM, Tyler Lemon wrote:<br>
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Hello,</div>
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There is a planned power outage in the EEL building on October 24, 2020 from 7AM to 5PM.</div>
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The RICH aerogel is stored in dryboxes in the gowning area of the DSG small cleanroom and relies on power to keep the tiles in a low humidity environment.<br>
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Because of the long duration of the outage, the dryboxes should be purged with nitrogen to keep the aerogel dry.<br>
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Since RICH is a Hall B detector, Hall B should provide Design Authority-approved set up with a nitrogen bottle, regulator, relief valve, and ability to connect 1/4" gas lines to three dryboxes.<br>
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Once Hall B has provided the gas setup, DSG will make the final connections to the dryboxes using feedthroughs leftover from RICH assembly a few years ago.<br>
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Best regards,</div>
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Tyler<br>
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<pre class="x_moz-signature" cols="72">--
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586
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