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

[Amrit Yegneswaran]

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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