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<p class="MsoNormal">Hi Tyler and Cavin,<o:p></o:p></p>
<p class="MsoNormal">Thanks for the testing the RICH cooling system.<o:p></o:p></p>
<p class="MsoNormal">I am very happy that you found and fixed the reason of the weird air pressure behavior that we noticed at the end of the spring run.<o:p></o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Valery<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Tyler Lemon <tlemon@jlab.org><br>
<b>Date: </b>Wednesday, October 9, 2019 at 10:47<br>
<b>To: </b>Bob Miller <rmiller@jlab.org>, Valery Kubarovsky <vpk@jlab.org>, Calvin Mealer <mealer@jlab.org>, Marco Battaglieri <battagli@jlab.org>, Stepan Stepanyan <stepanya@jlab.org>, dsg-rich <dsg-rich@jlab.org><br>
<b>Subject: </b>Re: RICH compressor after maintenance<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hello,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Calvin and I went to Hall B and he showed me how to operate the power transfer switch.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">We then started Compressor 2 and observed the same behavior as with Compressor 1. At this point, we leak checked the air-cooling system's panel and found that the hose from the valve panel to that
supplies the buffer tank was leaking (picture attached).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">After depressurizing the system, Calvin tightened that fitting and also the fitting for the hose from the buffer tank to the valve panel. Before tightening, both fittings were barely hand-tight.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">The compressor was then started and we verified the compressor kept building pressure until while flowing 900 slm total to RICH.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Attached is a plot of archived data showing the first "saw-tooth" cycle after turning the compressor back on. I will check the pressure data again this afternoon to check that the saw-tooth pattern
continues.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Tyler<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Bob Miller <rmiller@jlab.org><br>
<b>Sent:</b> Wednesday, October 9, 2019 8:29 AM<br>
<b>To:</b> Valery Kubarovsky <vpk@jlab.org>; Tyler Lemon <tlemon@jlab.org>; Calvin Mealer <mealer@jlab.org><br>
<b>Cc:</b> Stepan Stepanyan <stepanya@jlab.org>; Marco Battaglieri <battagli@jlab.org><br>
<b>Subject:</b> Re: RICH compressor after maintenance</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Tyler,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Please meet with Calvin and learn how to operate the power switch to transfer power between compressors. Then work with Valery to update the RICH procedure to include operation of both compressors.
After that, you and Valery can test the compressors as you please.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Bob<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Valery Kubarovsky <vpk@jlab.org><br>
<b>Sent:</b> Tuesday, October 8, 2019 6:27 PM<br>
<b>To:</b> Bob Miller <rmiller@jlab.org><br>
<b>Cc:</b> Valery Kubarovsky <vpk@jlab.org>; Stepan Stepanyan <stepanya@jlab.org>; Marco Battaglieri <battagli@jlab.org><br>
<b>Subject:</b> RICH compressor after maintenance</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="xxmsonormal">Hi Bob,<o:p></o:p></p>
<p class="xxmsonormal"> <o:p></o:p></p>
<p class="xxmsonormal">We tested old compressor (let me call it compressor 1). Please read message below from Tyler.<o:p></o:p></p>
<p class="xxmsonormal">It turns out that the compressor performance may be degraded. It looks like the maintenance did not help.<o:p></o:p></p>
<p class="xxmsonormal">At least the tank air pressure behaves differently from what we had in 2018-2019.<o:p></o:p></p>
<p class="xxmsonormal">We need to test the new compressor (N2) with two goals:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="xxmsolistparagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Test it’s performance<o:p></o:p></li><li class="xxmsolistparagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Compare with the compressor 1.<o:p></o:p></li></ol>
<p class="xxmsonormal"> <o:p></o:p></p>
<p class="xxmsonormal">Please let me know when you can connect the compressor 2 to power.<o:p></o:p></p>
<p class="xxmsonormal"> <o:p></o:p></p>
<p class="xxmsonormal">Thanks,<o:p></o:p></p>
<p class="xxmsonormal">Valery<o:p></o:p></p>
<p class="xxmsonormal"> <o:p></o:p></p>
<p class="xxmsonormal"> <o:p></o:p></p>
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<p class="xxmsonormal"><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><o:p></o:p></p>
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<p class="xxmsonormal"> <o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black">Hi Marco,</span><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"><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><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"><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><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"><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><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"><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><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black">Best regards,</span><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black">Tyler</span><o:p></o:p></p>
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<p class="xxmsonormal"><span style="font-size:12.0pt;color:black"> </span><o:p></o:p></p>
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<p class="xxmsonormal"> <o:p></o:p></p>
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<p class="xxmsonormal"><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>
<o:p></o:p></p>
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<p class="xxmsonormal"> <o:p></o:p></p>
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<p class="xxmsonormal">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><o:p></o:p></p>
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