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The air supply lines in Hall B will be much shorter than 100 ft.
Most likely ~ 40 ft in length. The air flow test should be repeated
using two 40 ft long 1/2" lines in parallel. The original plan was
to use 1" supply lines for each RICH, but since 1/2 lines are easier
to deal with, let us test that first. <br>
<br>
There is no reason to re-design the system, when a simple solution
exists.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 9/13/2017 9:23 AM, Amrit Yegneswaran
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:281546505.7459807.1505308992331.JavaMail.zimbra@jlab.org">
<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>hello,<br data-mce-bogus="1">
</div>
<div>tyler's measurement of the compressed air flow showed that
the compressed airflow through the 100 ft (31 m) long 0.5 in
(13 mm) diameter tube at a working pressure of ~60 psi (4
bar) at the input regulator is at best 12 cfm (350 l/min)</div>
<div>the graph below addresses the general features.<br
data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><img src="cid:part1.96AD5339.8271B925@jlab.org" alt=""
class=""></div>
<div><br data-mce-bogus="1">
</div>
<div>it is advisable to have the potential for a higher flow
rates to cool the electronics; to this end it is suggested
that the working pressure be increased to ~ 90 psi (6 bar)
(use a different regulator) and/or increase the diameter of
the tube to 1 in (25 mm).<br data-mce-bogus="1">
</div>
<div>if there is concurrence, the regulator and the tube will be
changed.<br data-mce-bogus="1">
</div>
<div>amrit<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
</div>
<br>
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<br>
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</blockquote>
<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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