<html><body><div style="font-family: arial,helvetica,sans-serif; font-size: 14pt; color: #000000"><div>Hi George,</div><div><br data-mce-bogus="1"></div><div>Thanks for showing me the manifold today. You are correct that this is indeed a problem. This manifold was also not part of the original design an open ended tube was. This manifold is significantly restricted. With these restrictions the new components will need to be rated at or near 90 psi and designed, fabricated, installed, examined, tested and inspected as required by the Code of construction.</div><div><br data-mce-bogus="1"></div><div>In my opinion this is an alteration of an existing system. This means that any JLAB design authority can be responsible for it. They will simply need to file the documentation in an alteration folder below the main pressure system folder in DocuShare.</div><div><br data-mce-bogus="1"></div><div>There will be some work involved but the original system will not have to be inspected or tested if work proceeds this way.</div><div><br data-mce-bogus="1"></div><div>Unfortunately I most likely will not be able to work on this much. A simple fix would be OK but, most of my time (really all) will be dedicated to the tritium target for the next 3 months. Your solution to the problem seems like a reasonable path forward and I can help with that if everyone agrees to it. More complicated solutions will require another DA to handle the alteration.</div><div><br data-mce-bogus="1"></div><div>Thanks and good luck</div><div><br></div><div data-marker="__SIG_PRE__">David Meekins<br>Staff Scientist<br>Thomas Jefferson National Accelerator Facility<br>12000 Jefferson Ave<br>Newport News Va. 23606<br><br>Office: 757-269-5434<br>Cell: 757-968-9076</div><br><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"George Jacobs" <jacobsg@jlab.org><br><b>To: </b>"David Meekins" <meekins@jlab.org>, "dsg-rich" <dsg-rich@jlab.org>, "Amrit Yegneswaran" <yeg@jlab.org>, "Patrizia Rossi" <rossi@jlab.org><br><b>Sent: </b>Thursday, September 21, 2017 3:20:38 PM<br><b>Subject: </b>Fwd: Re: [Dsg-rich] RICH air cooling pressure system update - Supply Lines and Internal Air Distribution Manifolds<br></div><br><div data-marker="__QUOTED_TEXT__">Hi Dave,<br>
<br>
Bob Miller directed me to you on this.<br>
<br>
The RICH air cooling pressure system does not include the air supply
line from the valve panel to the RICH or the distribution manifolds
inside the electronics module installed inside the RICH. Pressure in
the internal distribution manifold could be as high as 60 psi at
full design air flow. Assuming a worse case scenario of the supply
pressure regulator failure, it could be as high as 90 psi.<br>
<br>
Plan is to run two 1" OD, 0.813" ID nylon tubes from the panel to
the detector, L=60 ft each, to supply the two 1/2" OD internal
supply lines and distribution manifolds internal to the detector,
L=16 ft each. see attached diagram.<br>
<br>
The manifold will be made from a section of 1/2" OD SS tubing that
has the 2mm holes, orifices, drilled in it.<br>
<br>
The 1" OD Nylotube is rated at 230 psi. The 1/2" OD tubing and 1/2"
OD SS tubing are both rated > 120 psi. All components have
pressure rating greater than the worse case failure scenario.<br>
<br>
Due to the accelerated schedule, we should quickly determine a way
forward to complete any remaining pressure system requirements.<br>
<br>
Thanks,
<div class="moz-forward-container">George<br>
<br>
-------- Forwarded Message --------
<table class="moz-email-headers-table" cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
</th>
<td>Re: [Dsg-rich] RICH air cooling pressure system update -
Supply Lines and Internal Air Distribution Manifolds</td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Thu, 21 Sep 2017 14:52:47 -0400 (EDT)</td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Robert Miller <a class="moz-txt-link-rfc2396E" href="mailto:rmiller@jlab.org" target="_blank"><rmiller@jlab.org></a></td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td>George Jacobs <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org" target="_blank"><jacobsg@jlab.org></a></td>
</tr>
</tbody>
</table>
<br>
<br>
<div>Hi George,</div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Dave Meekins is the design authority
for the RICH. Please meet with him to discuss this issue.</div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Bob<br>
<br>
Sent from my iPhone</div>
<div><br>
On Sep 21, 2017, at 1:22 PM, George Jacobs <<a href="mailto:jacobsg@jlab.org" target="_blank">jacobsg@jlab.org</a>>
wrote:<br>
<br>
</div>
<blockquote>
<div>
Hi Sandro,<br>
<br>
I think the simplest solution is to replace the metric tubing
with 1/2" OD nylon tubing to route the air from the patch
panel to the air distribution manifold. Then use 1/2" SS tube
for the manifolds. These materials are in house.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 9/21/2017 11:02 AM, Sandro
Tomassini wrote:<br>
</div>
<blockquote cite="mid:b2d20f09-4ac5-2b2a-ea7b-bfe2c6f0da7d@lnf.infn.it">
<p>Hi Jeorge,</p>
<p>you mentioned the two 10 mm ID internal supply lines and
distribution manifolds internal to the detector,
unfortunately the OD for these lines is 10 mm and not the
ID.</p>
<p>Best regards</p>
<p>Sandro<br>
</p>
<br>
<div class="moz-cite-prefix">Il 21/09/2017 16:54, George
Jacobs ha scritto:<br>
</div>
<blockquote cite="mid:933c2230-14c6-769c-8168-02085e306858@jlab.org">
Hi Bob,<br>
<br>
The RICH air cooling pressure system does not include the
air supply line from the valve panel to the RICH or the
distribution manifolds inside the electronics module
installed inside the RICH. Pressure in the internal
distribution manifold could be as high as 60 psi at full
design air flow. Assuming a worse case scenario of the
supply pressure regulator failure, it could be as high as
90 psi.<br>
<br>
Plan is to run two 1" OD, 0.813" ID nylon tubes from the
panel to the detector, L=60 ft each, to supply the two 10
mm ID internal supply lines and distribution manifolds
internal to the detector, L=16 ft each. see attached
diagram.<br>
<br>
The distribution manifold was designed by INFN and
produced by a 3D printer. These manifolds are questionable
at best. I have suggested that these be replaced with a
section of SS tubing that has the 2mm holes, orifices,
drilled in it.<br>
<br>
The 1" OD Nylotube is rated at 230 psi. The 10mm ID tubing
and 10mm SS tubing are rated > 120 psi. All components
have pressure rating greater than the worse case failure
scenario.<br>
<br>
Due to the accelerated schedule, we should quickly
determine a way forward to complete any remaining pressure
system requirements.<br>
<br>
Thanks,<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">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank">https://userweb.jlab.org/~jacobsg</a></pre>
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<pre class="moz-signature">--
-----------------------------------------
Dr. Eng. Sandro Tomassini
Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
---Research Division---
P.O.Box 13 00044 Frascati (RM) Italy
Tel. office: +39 06 9403 2919/8089
Fax: +39 06 94032256
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:sandro.tomassini@lnf.infn.it" target="_blank">sandro.tomassini@lnf.infn.it</a>
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<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">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/%7Ejacobsg" target="_blank">https://userweb.jlab.org/~jacobsg</a></pre>
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