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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>
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cite="mid:1735821927.3449471.1502737089499.JavaMail.zimbra@jlab.org">
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<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 data-mce-style="width: 487px; table-layout:
fixed;">
<tbody>
<tr>
<td data-mce-style="text-align: center;">Manual
Pressure Regulator [psi]<br>
</td>
<td data-mce-style="text-align: center;">Manual
Rotameter [L/min]<br>
</td>
<td data-mce-style="text-align: center;">Mass
Flow Meter Measurement [L/min]<br>
</td>
</tr>
<tr>
<td data-mce-style="text-align: center;">30<br>
</td>
<td data-mce-style="text-align: center;">200<br>
</td>
<td data-mce-style="text-align: center;">200<br>
</td>
</tr>
<tr>
<td data-mce-style="text-align: center;">50<br>
</td>
<td data-mce-style="text-align: center;">300<br>
</td>
<td data-mce-style="text-align: center;">300<br>
</td>
</tr>
<tr>
<td data-mce-style="text-align: center;"><span
data-mce-style="background-color: #ffff00;
color: #ff0000;">60</span><br>
</td>
<td data-mce-style="text-align: center;"><span
data-mce-style="background-color: #ffff00;
color: #ff0000;">400</span><br>
</td>
<td data-mce-style="text-align: center;"><span
data-mce-style="background-color: #ffff00;
color: #ff0000;">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>
<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>
</div>
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<br>
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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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