[Dsg-rich] [New Logentry] RICH compressor pressure decrease investigation

[Tomassini Sandro]

Ciao Amrit, 
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. 
Thanks for the email from Tyler, I did not read already... 
I understand and agree with the bullets 2,4,5.
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... 
Anyway after a so long working period it is mandatory a service stop. 
Ciao
Sandro


⁣Inviato da BlueMail ​

Il giorno 11 apr 2019, 17:40, alle ore 17:40, Amrit Yegneswaran <yeg at jlab.org> ha scritto:
>come va sandro!
>nice to hear from you.
>hmm! straight to the point.
>
>copy of tyler's e-mail is attached below.
>these issues have to be addressed by hallb.
>perhaps marco/marco/valery can bring these issues up with hallB
>engineering.
>
>amrit
>
>Hello,
>
>During today's DSG weekly meeting, we discussed the problem with the
>RICH air pressure and compressor.
>
>The following conclusions and recommendations were discussed:
>
>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.
>
>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.
>
>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.
>
>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.
>
>5.) The second compressor should be powered.
>
>Best regards,
>Tyler
>
>
>________________________________
>From: Dsg-rich <dsg-rich-bounces at jlab.org> on behalf of Tomassini
>Sandro <sandro.tomassini at lnf.infn.it>
>Sent: Thursday, April 11, 2019 10:57 AM
>To: dsg-rich at jlab.org
>Subject: Re: [Dsg-rich] [New Logentry] RICH compressor pressure
>decrease investigation
>
>Hi all,
>The compressor has been working continously for a couple of years, have
>you ever  serviced it?
>If not plan a service as soon as possible, maybe a clean filter or
>something else is needed.
>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.
>Sorry for my considerations
>Have a good day
>Sandro
>
>Il 11/04/2019 16:32, Valery Kubarovsky ha scritto:
>
>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" <beng at jlab.org><mailto:beng at jlab.org>
>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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>
>--
>-----------------------------------------
>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
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