<html><head></head><body><div dir="auto">Ciao Amrit, <br></div>
<div dir="auto">Nice to hear from you, are you studying Italian? I am fine and in this moment I am having a rest after a long meeting day at the Atlas Upgrade week at CERN. <br></div>
<div dir="auto">Thanks for the email from Tyler, I did not read already... <br></div>
<div dir="auto">I understand and agree with the bullets 2,4,5.<br></div>
<div dir="auto">I guess the problem is because of a filter or if the air flow rate in the detector has not changed in time it could be a sensor drift... <br></div>
<div dir="auto">Anyway after a so long working period it is mandatory a service stop. <br></div>
<div dir="auto">Ciao<br></div>
<div dir="auto">Sandro<br><br><br></div>
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<div class="gmail_quote" >Il giorno 11 apr 2019, alle ore 17:40, Amrit Yegneswaran <<a href="mailto:yeg@jlab.org" target="_blank">yeg@jlab.org</a>> ha scritto:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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come va sandro!
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nice to hear from you.
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hmm! straight to the point.
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copy of tyler's e-mail is attached below.
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these issues
<b> have to be </b>addressed by hallb.
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perhaps marco/marco/valery can bring these issues up with hallB engineering.
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amrit
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<span style="color: rgb(200, 38, 19);">Hello,</span>
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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>
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<span style="color: rgb(200, 38, 19);">The following conclusions and recommendations were discussed:</span>
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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>
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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>
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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>
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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>
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<b><span style="color: rgb(200, 38, 19);">5.) The second compressor should be powered.</span></b>
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<span style="color: rgb(200, 38, 19);">Best regards,</span>
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<span style="color: rgb(200, 38, 19);">Tyler</span>
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<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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Hi all,
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The compressor has been working continously for a couple of years, have you ever serviced it?
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If not plan a service as soon as possible, maybe a clean filter or something else is needed.
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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.
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Sorry for my considerations
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Have a good day
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Sandro
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Il 11/04/2019 16:32, Valery Kubarovsky ha scritto:
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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">--
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Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
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