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In normal operation the compressor will operate in automatic. There
should be no issue with the compressor running at it's maximum set
point. Lowering operating pressure also reduces the cooling capacity
of the system due to a power outage.<br>
<br>
The receiver relief valve is set to 175 psi, it is not possible for
the compressor to overpressure the receiver or panel.<br>
<br>
The 90 psi relief valve on the panel is to protect the glass flow
meters from overpressure in case of pressure regulator failure.
These reliefs do not see receiver pressure unless the regulators
fail in what would be a worse case scenario. <br>
<br>
Resistance to flow in a gas line is linear with length. For a
realistic test, 50 ft lengths should be used. We may find that 2
tubes may be required per sector to maximize cooling flow.<br>
<br>
There are certain critical system design parameters that should be
verified. These critical parameters all deal with the cooling flow
capacities. IMO, the following should be measured in order to verify
the system will work in the hall as expected when installed.;<br>
-> Max cooling flow rate for 1 detector<br>
-> Max cooling flow rate for 2 detectors<br>
-> Max Power outage flow and time for 1 detector<br>
-> Max Power outage flow and time for 2 detectors<br>
-> Min Power outage flow and time for 1 detector<br>
-> Min Power outage flow and time for 2 detectors<br>
<br>
George<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/15/2017 11:38 AM, Tyler Lemon
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2089561222.3579521.1502811528523.JavaMail.zimbra@jlab.org">
<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt; color: #000000">
<div>Hello George,<br>
</div>
<div><br data-mce-bogus="1">
</div>
<div>Since it was a proof of concept test, we only went up to an
output pressure of 75 psi. Also, the OSP says the pressure in
the tank should be 80 psi so we did not want to go over 80psi
in the event the compressor did not shut off right when its
output pressure reached the set point. </div>
<div><br data-mce-bogus="1">
</div>
<div>There are also relief valves on the gas panel that are
rated for 90 psi. Since we know the compressor does shut off
immediately when the output pressure set point is reached, we
could set the output pressure to be 80 psi.<br
data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>For the length of the 1/2" OD tube, in April, Amanda,
Pablo, and I did a rough measurement on the Forward Carriage
(FC) for how long cables should be. We measured that roughly
110 feet would allow a cable to stretch from the location of
the gas panel on the FC top deck to where RICH will be on the
FC. I can go with Mindy to do a more precise measurement so we
have a more precise length.<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>Best regards,<br data-mce-bogus="1">
</div>
<div>Tyler<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Amrit Yegneswaran"
<a class="moz-txt-link-rfc2396E" href="mailto:yeg@jlab.org"><yeg@jlab.org></a><br>
<b>To: </b>"George Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
<b>Cc: </b>"dsg-rich" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-rich@jlab.org"><dsg-rich@jlab.org></a><br>
<b>Sent: </b>Tuesday, August 15, 2017 11:06:43 AM<br>
<b>Subject: </b>Re: [Dsg-rich] RICH gas panel test results<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">
<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>hello george,<br>
</div>
<div>and here i was thinking you as the gas expert and would
know all the answers or <em>find out these answers</em>,
but apparently i was wrong.<br>
</div>
<br>
<div>here, some comments.<br>
</div>
<br>
<div>with regards to the length, since we know where the
detector goes in the hall and where the compressor and air
tank go, i suggest you determine the length to the best
of your ability.<br>
</div>
<div>100 ft was a good guess; also adequate length to run it
around the clean room.<br>
</div>
<div>mindy please assist george in this endeavor. <br>
</div>
<br>
<div>the goals of the test was <em>basically proof of
principle that the system works.</em><br>
</div>
<div>we learned that the system does indeed work, but not
100% as we expected.<br>
</div>
<br>
<div>we learned that the wrong pressure gas was either
ordered/delivered.<br>
</div>
<div>then there were the issues with connections/ fittings.<br>
</div>
<div>issues with cables.<br>
</div>
<div>we learned that the output N2 temperature was 68F to
72F<br>
</div>
<div>we learned that the flow never quite reached 400 l/m<br>
</div>
<div>and so on and on...<br>
</div>
<br>
<div>so we learned all the stuff which wasn't right and all
the stuff that needed to be learned,<br>
</div>
<div><strong>one cannot know what one has to know before one
knows it.</strong><br>
</div>
<div>or to quote amanda: i don't know what i don't know till
i don't know.<br>
</div>
<br>
<div>with regards to the compressor set point tyler will
explain it to you.<br>
</div>
<br>
<div>yes, there were two pre-test meetings on two
consecutive wednesdays during the dsg meeting.<br>
</div>
<div>i was requesting <em>t<span style="text-decoration:
underline;" data-mce-style="text-decoration:
underline;">he test to demonstrate proof of principle
that the system works.</span></em><br>
</div>
<br>
<div>so, the end<br>
</div>
<div>amrit<br>
</div>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<hr id="zwchr">
<div><b>From: </b>"George Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
<b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:dsg-rich@jlab.org">dsg-rich@jlab.org</a><br>
<b>Sent: </b>Tuesday, August 15, 2017 8:53:43 AM<br>
<b>Subject: </b>Re: [Dsg-rich] RICH gas panel test
results<br>
</div>
<br>
<div>I have a couple questions on the air cooling system
test performed yesterday;<br>
1) What is the length of the 1/2 OD line that goes from
the air panel outlet to the RICH inlet? It started out as
a 100ft length.<br>
2) Absent a written test procedure, what were the specific
goals of this test?<br>
3) Why is the air compressor outlet pressure setpoint so
far below the rated output of the compressor?<br>
4) Was there a pre-test meeting or discussion prior the
test?<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 8/14/2017 2:58 PM, Tyler
Lemon wrote:<br>
</div>
<blockquote
cite="mid:1735821927.3449471.1502737089499.JavaMail.zimbra@jlab.org">
<div>
<div>
<div>
<div>
<div>
<div>Hello,<br>
</div>
<br>
<div>This morning Mindy, Marc, George, and I
tested the RICH gas panel. Both the nitrogen
purge instrumentation and air cooling
instrumentation were tested.<br>
</div>
<br>
<div>For the nitrogen purge system, we
connected the nitrogen dewar to the gas
panel. Initially, we were not able to get
over 4 liters per minute (L/min) of nitrogen
flow as the dewar was not a high-pressure
dewar, as ordered. George has already
arranged for the correct, high-pressure
dewar to be delivered on Wednesday August
16. After noting the dewar was a
low-pressure dewar, we swapped the installed
pressure regulator with an orifice for a
regulator without an orifice. The new
regulator without the orifice allowed the
nitrogen flow to be set to ~15 L/min. We set
the nitrogen flow to 6 L/min and measured
the temperature of the gas on the very end
of the gas line in EEL 124 cleanroom. The
output nitrogen temperature at the end of
the gas line was ~69 degrees Fahrenheit. The
ambient temperature of EEL 124 was ~72
degrees Fahrenheit.</div>
<br>
<div>For the air-cooling system, we connected
the air lines to the gas panel. We set the
compressor to automatically turn off if its
output pressure reached 70 psi and to
automatically turn on if its output pressure
drops to 58 psi. The values set on manual
instrumentation and the values measured by
the mass flow meter are in the table below.
To get the flow output to be higher, we had
to also increase the pressure to the
rotameter using the manual pressure
regulator.</div>
<br>
<div>
<table>
<tbody>
<tr>
<td>Manual Pressure Regulator [psi]<br>
</td>
<td>Manual Rotameter [L/min]<br>
</td>
<td>Mass Flow Meter Measurement
[L/min]<br>
</td>
</tr>
<tr>
<td>30<br>
</td>
<td>200<br>
</td>
<td>200<br>
</td>
</tr>
<tr>
<td>50<br>
</td>
<td>300<br>
</td>
<td>300<br>
</td>
</tr>
<tr>
<td><span>60</span><br>
</td>
<td><span>400</span><br>
</td>
<td><span>350</span><br>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<br>
</div>
<div>We were not able to get 400 L/min when the
manual rotameter was set to 400 L/min. We tried
increasing the output pressure at which the
compressor turns off from 70 psi to 75 psi, but
the pressure at the manual pressure regulator
did not go above ~60 psi and the measured flow
above ~350 psi. If during the cooling tests, 350
L/min is not enough to sufficiently cool the
electronic panel, we could further adjust the
output settings of the compressor to try to
reach 400 L/min.</div>
<br>
<div>Best regards,<br>
</div>
<div>Tyler<br>
</div>
</div>
<br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
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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" data-mce-href="mailto:jacobsg@jlab.org" moz-do-not-send="true">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/~jacobsg" moz-do-not-send="true">https://userweb.jlab.org/~jacobsg</a>
</pre>
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<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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