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come va sandro!</div>
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nice to hear from you.</div>
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hmm! straight to the point.</div>
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copy of tyler's e-mail is attached below.</div>
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these issues<b> have to be </b>addressed by hallb.</div>
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perhaps marco/marco/valery can bring these issues up with hallB engineering.</div>
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amrit<br>
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<span style="color: rgb(200, 38, 19);">Hello,</span></div>
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<span style="color: rgb(200, 38, 19);">During today's DSG weekly meeting, we discussed the problem with the RICH air pressure and compressor.</span></div>
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<span style="color: rgb(200, 38, 19);">The following conclusions and recommendations were discussed:</span></div>
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<span style="color: rgb(200, 38, 19);">1.) For the past few months, there has been a correlation between ambient air pressure and RICH pressure and airflows. However, this correlation does not appear to be significant since the tank pressure and airflow only
changes slightly with ambient pressure.</span></div>
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<span style="color: rgb(200, 38, 19);"><b>2.) The filter at the compressor's output should be changed/drained by Hall B since its pressure drop gauge is in the red and if the filter is saturated, it may be preventing the compressor from outputting at its full
capacity. The compressor will need to be powered off and the entire air-cooling system depressurized to do this.</b></span><br>
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<span style="color: rgb(200, 38, 19);">3.) The PT used for alarms and interlocks should be replaced. Again, the compressor will need to be powered off and the entire air-cooling system depressurized to do this.</span><br>
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<span style="color: rgb(200, 38, 19);"><b>4.) It would be good to determine what routine maintenance the compressor should undergo. If any is needed, Hall B would have to arrange this with Atlas Copco.</b></span></div>
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<b><span style="color: rgb(200, 38, 19);">5.) The second compressor should be powered.</span></b></div>
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<span style="color: rgb(200, 38, 19);">Best regards,</span></div>
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<span style="color: rgb(200, 38, 19);">Tyler</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Dsg-rich <dsg-rich-bounces@jlab.org> on behalf of Tomassini Sandro <sandro.tomassini@lnf.infn.it><br>
<b>Sent:</b> Thursday, April 11, 2019 10:57 AM<br>
<b>To:</b> dsg-rich@jlab.org<br>
<b>Subject:</b> Re: [Dsg-rich] [New Logentry] RICH compressor pressure decrease investigation</font>
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<div class="x_moz-cite-prefix">Hi all,</div>
<div class="x_moz-cite-prefix">The compressor has been working continously for a couple of years, have you ever serviced it?</div>
<div class="x_moz-cite-prefix">If not plan a service as soon as possible, maybe a clean filter or something else is needed.</div>
<div class="x_moz-cite-prefix">Looking at the attached plots it seems it is working at 50% of its setpoint pressure and never stops, it sounds like there is a loss of efficiency in the device.</div>
<div class="x_moz-cite-prefix">Sorry for my considerations<br>
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<div class="x_moz-cite-prefix">Have a good day</div>
<div class="x_moz-cite-prefix">Sandro<br>
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<div class="x_moz-cite-prefix">Il 11/04/2019 16:32, Valery Kubarovsky ha scritto:<br>
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<pre class="x_moz-quote-pre">Hi Brian,
I also noticed that the compressor changed the behavior during the last year.
Take a look to the attached plots. In April 2018 the frequency of oscillations is different from October 2018. The time range is 8 hours, one shift.
In April 2019 the compressor is working all the time.
Regards,
Valery
On 4/10/19, 11:12, "Brian Eng" <a class="x_moz-txt-link-rfc2396E" href="mailto:beng@jlab.org"><beng@jlab.org></a> wrote:
- 2018 Apr - compressor always cycling on and off
- 2018 Oct - compressor cycling on and off & periods of it not
- 2019 Feb - compressor never cycling
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<pre class="x_moz-quote-pre">_______________________________________________
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<pre class="x_moz-signature" cols="72">--
-----------------------------------------
Dr. Eng. Sandro Tomassini
Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
---Research Division---
P.O.Box 13 00044 Frascati (RM) Italy
Tel. office: +39 06 9403 2919/8089
Fax: +39 06 94032256
e-mail: <a class="x_moz-txt-link-abbreviated" href="mailto:sandro.tomassini@lnf.infn.it">sandro.tomassini@lnf.infn.it</a>
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-- </pre>
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