<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear Marc and DSG,<div class=""><br class=""></div><div class="">Thank you very much for sending this e-mail out. </div><div class="">As you have correctly written, an uninterrupted N2 supply is mandatory for the RICH thus I am sure that Denny and Bob will take as soon as possible the necessary actions in order to implement the secondary N2 supply.</div><div class=""><br class=""></div><div class="">Best regards</div><div class=""><br class=""></div><div class="">Patrizia<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 21, 2018, at 2:02 PM, Marc McMullen <<a href="mailto:mcmullen@jlab.org" class="">mcmullen@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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</p><p class="MsoNormal"><font size="+1" class="">Hi Denny, Bob, Marco C. and
Marco M.</font></p>
<font size="+1" class="">
</font><p class="MsoNormal"><font size="+1" class="">As you are aware, the RICH
detector requires an uninterrupted
gas supply. The moisture content of the detector shell volume,
which houses the
Aerogel tiles, increases rapidly with the cessation of N2, as
shown by the
observations presented by Tyler Lemon (DSG RICH contact). The
maintenance
outage, to install the isolation valves (9/21), has presented
us with information
on just how much the humidity in the detector volume can
change in just 27
minutes. Unfortunately, what cannot be measured is the amount
of absorption
into the tiles, or the efficiency degradation due to moisture.</font></p>
<font size="+1" class="">
</font><p class="MsoNormal"><font size="+1" class="">What can be done is taking
preventative measures to ensure
the safety of the detector for future events. To that end, DSG
has discussed
the design and implementation of a secondary N2 supply. In
previous discussions
DSG and Hall B planned to use high pressure LN2 dewars to
supply the detector
during a planned outage. This would still be a viable solution
for an outage
lasting many hours or longer. </font></p>
<font size="+1" class="">
</font><p class="MsoNormal"><font size="+1" class="">For unplanned outages or very
short planned outages, a supplementary
N2 circuit (see attached) developed by G. Jacobs and the DSG
could use multiple
high pressure N2 bottles in parallel. Gas flow can be
triggered using a
pressure controlled switch, and check valves will ensure the
gas flows to the
detector instead of back towards the standard N2 source. <span style="mso-spacerun:yes" class=""> </span>DSG has already procured
eight 255cf bottles
of N2, which are currently located on the gas pad outside of
the gas shed. <span style="mso-spacerun:yes" class=""> </span>We have
calculated 2 to 3 hours of gas per
cylinder at the current flow rate (40Lpm). </font></p>
<font size="+1" class="">
</font><p class="MsoNormal"><font size="+1" class="">Once this plan is approved,
DSG can source all necessary
components and provide diagrams. Hall B Engineering should
evaluate the system
for integration/installation with the current Hall B N2
system, and provide all
required safety documentation/inspections (including Jlab
pressure systems
compliance). DSG can assist with installation, at the
direction of the Hall
work coordinator to ensure all Hall B/Physics work governance
procedures are
observed.</font></p>
<font size="+1" class="">
</font><p class="MsoNormal"><font size="+1" class=""><span style="mso-spacerun:yes" class=""> </span>With pre-assembly,
planning,
and coordination between Hall B and the DSG, work in the hall
can be minimized
so that installation can be completed in a short amount of
time.<br class="">
</font></p><p class="MsoNormal"><font size="+1" class="">Regards,<br class="">
</font></p><div class=""><br class="webkit-block-placeholder"></div>
<pre class="moz-signature" cols="72">--
<font size="+1" class="">Marc McMullen
Detector Support Group
757-269-7738</font></pre>
</div>
<span id="cid:00D1B43C-32F8-45F4-9CC0-EF91ABF93F5F"><RICH-N2-valve panel-REV2-AUTOCHANGE.pdf></span>_______________________________________________<br class="">Dsg-rich mailing list<br class=""><a href="mailto:Dsg-rich@jlab.org" class="">Dsg-rich@jlab.org</a><br class="">https://mailman.jlab.org/mailman/listinfo/dsg-rich<br class=""></div></blockquote></div><br class=""></div></body></html>