<html><body><div style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900"><div>marc, <br></div><div>thanks for informing denny and bob about the <em>lead time needed to set up alternate N2 supply for the RICH aerogel</em>, (as confirmed by george) and thus concluding the matter.<br data-mce-bogus="1"></div><div>amrit<br data-mce-bogus="1"></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Marc Mcmullen" <mcmullen@jlab.org><br><b>To: </b>"dsg-hallbgas" <dsg-hallbgas@jlab.org>, "dsg-rich" <dsg-rich@jlab.org>, "Denny Insley" <dinsley@jlab.org><br><b>Cc: </b>"Patrizia Rossi" <rossi@jlab.org><br><b>Sent: </b>Monday, May 7, 2018 3:09:14 PM<br><b>Subject: </b>Re: [Dsg-hallbgas] [Dsg-internal] Pressure Systems work for Hall B N2 distribution system<br></div><div><br></div><div data-marker="__QUOTED_TEXT__"><p>Hi Denny and Bob,</p><p>Just a recap of this morning's conversation, DSG will need at least two weeks notice of any work which would cause an interruption of N2 to Hall B. This will give enough time to order high pressure LN2 dewars to be delivered to the hall. This will ensure that the Aerogel has a continuous source of N2 at all times to prevent the absorption of moisture.</p><p>Thanks,</p><p>Marc<br></p><br><div class="moz-cite-prefix">On 5/4/2018 3:57 PM, Amrit Yegneswaran wrote:<br></div><blockquote cite="mid:725120519.7985429.1525463872504.JavaMail.zimbra@jlab.org"><div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900" data-mce-style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900;"><div>thanks for the explanation george.<br></div><div>i guess we need liquid N2 cylinders for the RICH, if not high purity N2 cylinders.<br></div><div>we have to coordinate closely with denny so that we have N2 before hallB engineering starts work.<br></div><div>amrit<br></div><div><br></div><hr id="zwchr"><div><b>From: </b>"George Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org" target="_blank" data-mce-href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br> <b>To: </b>"Amrit Yegneswaran" <a class="moz-txt-link-rfc2396E" href="mailto:yeg@jlab.org" target="_blank" data-mce-href="mailto:yeg@jlab.org"><yeg@jlab.org></a><br> <b>Sent: </b>Thursday, May 3, 2018 4:02:31 PM<br> <b>Subject: </b>Re: [Dsg-internal] Pressure Systems work for Hall B N2 distribution system<br></div><div><br></div><div>Hi Amrit,<br> <br> This was work in progress that was interrupted for the run.<br> <br> I specified the requirement for a temporary alternative N2 supply to maintain the RICH aerogel purge during the outage. <br> <br> The work plus pressure testing could take a week or longer. It's important to complete all the required work to eliminate the need for subsequent N2 outages. <br> <br> The hot work, brazing the fittings for the relief valve, and it's detailed QA requirements, will drive the timing of this work. Then once all the tasks have been accomplished, pressure testing will require at least a day, maybe more.<br> <br> The bottom line is that this must be well planned.<br> <br> George<br> <br><div class="moz-cite-prefix">On 5/3/2018 1:50 PM, Amrit Yegneswaran wrote:<br></div><blockquote cite="mid:1355024141.7774475.1525369846070.JavaMail.zimbra@jlab.org"><div style="font-family: tahoma,new york,times,serif;
font-size: 14pt; color: #009900" data-mce-style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900;"><div>george,<br></div><div>was this e-mail of yours in response to a request from someone in HallB, or is it from your bucket list.<br></div><div>work must be scheduled such that there is no interruption N2 flow to the RICH.<br></div><div>more on monday.<br></div><div>amrit<br></div><div><br></div><hr id="zwchr"><div><b>From: </b>"George Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org" target="_blank" data-mce-href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br> <b>To: </b>"Bob Miller" <a class="moz-txt-link-rfc2396E" href="mailto:rmiller@jlab.org" target="_blank" data-mce-href="mailto:rmiller@jlab.org"><rmiller@jlab.org></a>, "Dave Kashy" <a class="moz-txt-link-rfc2396E" href="mailto:kashy@jlab.org" target="_blank" data-mce-href="mailto:kashy@jlab.org"><kashy@jlab.org></a>, "Volker Burkert" <a class="moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org" target="_blank" data-mce-href="mailto:burkert@jlab.org"><burkert@jlab.org></a>, "Stepan Stepanyan" <a class="moz-txt-link-rfc2396E" href="mailto:stepanya@jlab.org" target="_blank" data-mce-href="mailto:stepanya@jlab.org"><stepanya@jlab.org></a>, "dsg-internal" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-internal@jlab.org" target="_blank" data-mce-href="mailto:dsg-internal@jlab.org"><dsg-internal@jlab.org></a><br> <b>Sent: </b>Thursday, May 3, 2018 11:11:49 AM<br> <b>Subject: </b>[Dsg-internal] Pressure Systems work for Hall B N2 distribution system<br></div><div><br></div><div>Hi Bob,<br> <br> The pressure systems work for the Hall B N2 distribution system is incomplete. This work was placed on hold until after this run period. This work requires isolation of the Hall B N2 gas supply. A temporary alternative N2 supply will be required to maintain the RICH aerogel purge during the outage. <br> <br> Dave Kashy is the DA on this system. <br> <br> The following tasks are outstanding;<br> - Relief valve installation<br> - Fwd Carriage flex line replacement<br> - RICH N2 supply valve relocation<br> The following task is NEW;<br> - RICH N2 supply capacity increase (Upgrade)<span><br> </span>Re-purpose existing ½” gas line to double flow capacity to FWD Carriage to prepare for 2nd RICH N2 flow requirements<br> <br> I have attached a pdf showing the N2 supply P&I diagram with the piping changes in red. I have also attached a pdf showing the relief valve installation detail. All the components required for the relief valve installation were stored in the gas shed prior to this run. <br> <br> George<br><pre class="moz-signature">--
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" target="_blank" data-mce-href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank" data-mce-href="https://userweb.jlab.org/%7Ejacobsg">https://userweb.jlab.org/~jacobsg</a>
</pre><br> _______________________________________________<br> Dsg-internal mailing list<br> <a class="moz-txt-link-abbreviated" href="mailto:Dsg-internal@jlab.org" target="_blank" data-mce-href="mailto:Dsg-internal@jlab.org">Dsg-internal@jlab.org</a><br> <a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/dsg-internal" target="_blank" data-mce-href="https://mailman.jlab.org/mailman/listinfo/dsg-internal">https://mailman.jlab.org/mailman/listinfo/dsg-internal</a><br></div></div><br><fieldset class="mimeAttachmentHeader"></fieldset><br><pre>_______________________________________________
Dsg-internal mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Dsg-internal@jlab.org" target="_blank" data-mce-href="mailto:Dsg-internal@jlab.org">Dsg-internal@jlab.org</a>
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</pre></blockquote><br><pre class="moz-signature">--
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" target="_blank" data-mce-href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank" data-mce-href="https://userweb.jlab.org/%7Ejacobsg">https://userweb.jlab.org/~jacobsg</a>
</pre><br></div></div><br><fieldset class="mimeAttachmentHeader"></fieldset><br><pre>_______________________________________________
Dsg-internal mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Dsg-internal@jlab.org" target="_blank" data-mce-href="mailto:Dsg-internal@jlab.org">Dsg-internal@jlab.org</a>
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</pre></blockquote><br><pre class="moz-signature">--
Marc McMullen
Detector Support Group
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