<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi Valery,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
To establish a naming convention for the RICH compressors since there are two of them:</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<ul>
<li>Compressor 1 is the compressor that has run in Hall B for previous experimental runs, was serviced recently by Hall B Engineering, and was turned on yesterday.<br>
</li></ul>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<ul>
<li>Compressor 2 is the other compressor currently sitting unused and without power also on the top deck of the Forward Carriage.<br>
</li></ul>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
If you want to see how the Compressor 2 behaves, we can plan to switch to and test Compressor 2.<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
If after the switch to Compressor 2, we see the same behavior as in April 2018, it may mean that Compressor 1 needs to be serviced beyond what anyone other than Atlas Copco can do.
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Considering this, it may be a good idea to plan to optimize the settings for Compressor 2 and also the air-cooling panel. Anything that can be done to limit the time the compressor is running or the number of times it has to switch on or off will only serve
to extend the life of the compressor.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Best regards,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Tyler<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Valery Kubarovsky <vpk@jlab.org><br>
<b>Sent:</b> Tuesday, October 8, 2019 4:23 PM<br>
<b>To:</b> Tyler Lemon <tlemon@jlab.org>; Marco Mirazita <Marco.Mirazita@lnf.infn.it><br>
<b>Cc:</b> dsg-rich@jlab.org <dsg-rich@jlab.org>; Valery Kubarovsky <vpk@jlab.org>; Marco Contalbrigo <mcontalb@fe.infn.it>; Patrizia Rossi <rossi@jlab.org><br>
<b>Subject:</b> Re: [Dsg-rich] [EXTERNAL] Re: [New Logentry] RICH compressor ON after maintenance</font>
<div> </div>
</div>
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Calibri}
@font-face
{}
p.x_MsoNormal, li.x_MsoNormal, div.x_MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
a:link, span.x_MsoHyperlink
{color:blue;
text-decoration:underline}
a:visited, span.x_MsoHyperlinkFollowed
{color:purple;
text-decoration:underline}
p.x_msonormal0, li.x_msonormal0, div.x_msonormal0
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
span.x_EmailStyle18
{font-family:"Calibri",sans-serif;
color:windowtext}
.x_MsoChpDefault
{font-size:10.0pt}
@page WordSection1
{margin:1.0in 1.0in 1.0in 1.0in}
div.x_WordSection1
{}
-->
</style>
<div lang="EN-US" link="blue" vlink="purple">
<div class="x_WordSection1">
<p class="x_MsoNormal"><span style="font-size:14.0pt">Hi Tyler,</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">Please take a look to the attached report dated on April 11, 2019.</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">Page 2 presented the compressor performance from April 4, 2018 to April 10, 2019.</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">As you see, we noticed the significant degradation of it.</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">I hoped that the service that was done this year will improve the situation.</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">However, it looks like it did not. We may get a serious problem in the coming fall run.
</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">We can try another compressor to compare with the old one.</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">Regards,</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt">Valery</span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:14.0pt"> </span></p>
<div style="border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0in 0in 0in">
<p class="x_MsoNormal"><b><span style="font-size:12.0pt; color:black">From: </span>
</b><span style="font-size:12.0pt; color:black">Dsg-rich <dsg-rich-bounces@jlab.org> on behalf of Tyler Lemon <tlemon@jlab.org><br>
<b>Date: </b>Tuesday, October 8, 2019 at 13:36<br>
<b>To: </b>Marco Mirazita <Marco.Mirazita@lnf.infn.it><br>
<b>Cc: </b>"dsg-rich@jlab.org" <dsg-rich@jlab.org><br>
<b>Subject: </b>Re: [Dsg-rich] [EXTERNAL] Re: [New Logentry] RICH compressor ON after maintenance</span></p>
</div>
<div>
<p class="x_MsoNormal"> </p>
</div>
<div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Hi Marco,</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Is there a set schedule for the tests where the compressor is needed? We can plan to have the compressor turned back on in time for that if there is.</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Looking at the archived compressor data since it has been turned on and running steadily, we can see that the compressor is not doing its typical "saw-tooth" pattern that we saw this past April.
All other cooling parameters are similar to previous experimental runs.</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Attached are plots of archived data: one from the past ~24 hours, and one from about one year ago in September 2018. The one from September 2018 shows the typical "saw-tooth" pattern we expect,
but the one from the past 24 hours does not.</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">The only difference between the two plots is the ambient pressure is higher (411 inches-H2O vs 408 inches-H2O) in the one from September 2018, but I am unsure if this is a big enough difference
to cause the saw-tooth pattern to not occur.</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Best regards,</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Tyler</span></p>
</div>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<p class="x_MsoNormal"> </p>
<div class="x_MsoNormal" align="center" style="text-align:center">
<hr size="2" width="98%" align="center">
</div>
<div id="x_divRplyFwdMsg">
<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Marco Mirazita <Marco.Mirazita@lnf.infn.it><br>
<b>Sent:</b> Tuesday, October 8, 2019 12:04 PM<br>
<b>To:</b> Tyler Lemon <tlemon@jlab.org><br>
<b>Cc:</b> dsg-rich@jlab.org <dsg-rich@jlab.org><br>
<b>Subject:</b> [EXTERNAL] Re: [Dsg-rich] [New Logentry] RICH compressor ON after maintenance</span>
</p>
<div>
<p class="x_MsoNormal"> </p>
</div>
</div>
<div>
<div>
<p class="x_MsoNormal">Hi Tyler,<br>
I completed this first test on the RICH (elog <br>
<a href="https://logbooks.jlab.org/entry/3733786">https://logbooks.jlab.org/entry/3733786</a>) and the detector is now off.<br>
I would ask you to turn the compressor also off, unless you need to make <br>
some further test.<br>
The compressor on and electronics off is a condition we want to avoid, <br>
because it generates an increase of the humidity inside the RICH.<br>
Thank you,<br>
Marco<br>
<br>
<br>
Il 2019-10-07 20:20 tlemon@jlab.org ha scritto:<br>
> RICH COMPRESSOR ON AFTER MAINTENANCE [1]<br>
> <br>
> * Edit [2]<br>
> * Delete [3]<br>
> <br>
> Lognumber 3733741 [1]. Submitted by tlemon [4] on Mon, 10/07/2019 -<br>
> 14:16 [5].<br>
> <br>
> LOGBOOKS:<br>
> RICH [6]<br>
> <br>
> ENTRY MAKERS:<br>
> ambrown, campero, mealer<br>
> <br>
> The compressor in the RICH air-cooling system has been turned on after<br>
> maintenance on and replacement of the buffer tank PT.<br>
> <br>
> All compressor settings are the same as during the spring physics run:<br>
> Compressor internal on-off settings: on at 104 psi; off at 113 psi<br>
> (highest output range allowable on compressor)<br>
> Airflow 1: 500 slm<br>
> Airflow 2: 400 slm<br>
> <br>
> The new PT installed on the buffer tank appears to match the pressure<br>
> indicated by the buffer tank's local pressure gauge. Because of this,<br>
> the PT reading may be a little different than before.<br>
> <br>
> Since the cooling system is back online, RICH electronics can now be<br>
> powered.<br>
> <br>
> <br>
> Links:<br>
> ------<br>
> [1] <a href="https://logbooks.jlab.org/entry/3733741">https://logbooks.jlab.org/entry/3733741</a><br>
> [2] <a href="https://logbooks.jlab.org/entry/3733741/edit?destination=email/send">
https://logbooks.jlab.org/entry/3733741/edit?destination=email/send</a><br>
> [3] <br>
> <a href="https://logbooks.jlab.org/entry/3733741/delete?destination=email/send">
https://logbooks.jlab.org/entry/3733741/delete?destination=email/send</a><br>
> [4] <a href="https://logbooks.jlab.org/user/tlemon">https://logbooks.jlab.org/user/tlemon</a><br>
> [5]<br>
> <a href="https://logbooks.jlab.org/entries?start_date=1570468581&end_date=1570475781&book=RICH">
https://logbooks.jlab.org/entries?start_date=1570468581&end_date=1570475781&book=RICH</a><br>
> [6] <a href="https://logbooks.jlab.org/book/rich">https://logbooks.jlab.org/book/rich</a><br>
> <br>
> _______________________________________________<br>
> Dsg-rich mailing list<br>
> Dsg-rich@jlab.org<br>
> <a href="https://mailman.jlab.org/mailman/listinfo/dsg-rich">https://mailman.jlab.org/mailman/listinfo/dsg-rich</a></p>
</div>
</div>
</div>
</div>
</body>
</html>