[Dsg-rich] RICH compressor after maintenance

Wed Oct 9 14:18:09 EDT 2019

Tyler, Calvin,
good job!
Thanks!
Marco

On 9 Oct 2019, at 10:47, Tyler Lemon <tlemon at jlab.org<mailto:tlemon at jlab.org>> wrote:

Hello,

Calvin and I went to Hall B and he showed me how to operate the power transfer switch.

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).

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.

The compressor was then started and we verified the compressor kept building pressure until while flowing 900 slm total to RICH.

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.

Best regards,
Tyler
________________________________
From: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>
Sent: Wednesday, October 9, 2019 8:29 AM
To: Valery Kubarovsky <vpk at jlab.org<mailto:vpk at jlab.org>>; Tyler Lemon <tlemon at jlab.org<mailto:tlemon at jlab.org>>; Calvin Mealer <mealer at jlab.org<mailto:mealer at jlab.org>>
Cc: Stepan Stepanyan <stepanya at jlab.org<mailto:stepanya at jlab.org>>; Marco Battaglieri <battagli at jlab.org<mailto:battagli at jlab.org>>
Subject: Re: RICH compressor after maintenance

Tyler,

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.

Regards,
Bob
________________________________
From: Valery Kubarovsky <vpk at jlab.org<mailto:vpk at jlab.org>>
Sent: Tuesday, October 8, 2019 6:27 PM
To: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>
Cc: Valery Kubarovsky <vpk at jlab.org<mailto:vpk at jlab.org>>; Stepan Stepanyan <stepanya at jlab.org<mailto:stepanya at jlab.org>>; Marco Battaglieri <battagli at jlab.org<mailto:battagli at jlab.org>>
Subject: RICH compressor after maintenance

Hi Bob,

We tested old compressor (let me call it compressor 1). Please read message below from Tyler.
It turns out that the compressor performance may be degraded. It looks like the maintenance did not help.
At least the tank air pressure behaves differently from what we had in 2018-2019.
We need to test the new compressor (N2) with two goals:

  1.  Test it’s performance
  2.  Compare with the compressor 1.

Please let me know when you can connect the compressor 2 to power.

Thanks,
Valery

From: Dsg-rich <dsg-rich-bounces at jlab.org<mailto:dsg-rich-bounces at jlab.org>> on behalf of Tyler Lemon <tlemon at jlab.org<mailto:tlemon at jlab.org>>
Date: Tuesday, October 8, 2019 at 13:36
To: Marco Mirazita <Marco.Mirazita at lnf.infn.it<mailto:Marco.Mirazita at lnf.infn.it>>
Cc: "dsg-rich at jlab.org<mailto:dsg-rich at jlab.org>" <dsg-rich at jlab.org<mailto:dsg-rich at jlab.org>>
Subject: Re: [Dsg-rich] [EXTERNAL] Re: [New Logentry] RICH compressor ON after maintenance

Hi Marco,

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.

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.

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.

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.

Best regards,
Tyler

________________________________
From: Marco Mirazita <Marco.Mirazita at lnf.infn.it<mailto:Marco.Mirazita at lnf.infn.it>>
Sent: Tuesday, October 8, 2019 12:04 PM
To: Tyler Lemon <tlemon at jlab.org<mailto:tlemon at jlab.org>>
Cc: dsg-rich at jlab.org<mailto:dsg-rich at jlab.org> <dsg-rich at jlab.org<mailto:dsg-rich at jlab.org>>
Subject: [EXTERNAL] Re: [Dsg-rich] [New Logentry] RICH compressor ON after maintenance

Hi Tyler,
I completed this first test on the RICH (elog
https://logbooks.jlab.org/entry/3733786) and the detector is now off.
I would ask you to turn the compressor also off, unless you need to make
some further test.
The compressor on and electronics off is a condition we want to avoid,
because it generates an increase of the humidity inside the RICH.
Thank you,
Marco

Il 2019-10-07 20:20 tlemon at jlab.org<mailto:tlemon at jlab.org> ha scritto:
> RICH COMPRESSOR ON AFTER MAINTENANCE [1]
>
>        * Edit [2]
>        * Delete [3]
>
>  Lognumber 3733741 [1]. Submitted by tlemon [4] on Mon, 10/07/2019 -
> 14:16 [5].
>
>                LOGBOOKS:
>                RICH [6]
>
>                ENTRY MAKERS:
>                ambrown, campero, mealer
>
> The compressor in the RICH air-cooling system has been turned on after
> maintenance on and replacement of the buffer tank PT.
>
> All compressor settings are the same as during the spring physics run:
>  Compressor internal on-off settings: on at 104 psi; off at 113 psi
> (highest output range allowable on compressor)
>  Airflow 1: 500 slm
>  Airflow 2: 400 slm
>
> The new PT installed on the buffer tank appears to match the pressure
> indicated by the buffer tank's local pressure gauge. Because of this,
> the PT reading may be a little different than before.
>
> Since the cooling system is back online, RICH electronics can now be
> powered.
>
>
> Links:
> ------
> [1] https://logbooks.jlab.org/entry/3733741
> [2] https://logbooks.jlab.org/entry/3733741/edit?destination=email/send
> [3]
> https://logbooks.jlab.org/entry/3733741/delete?destination=email/send
> [4] https://logbooks.jlab.org/user/tlemon
> [5]
> https://logbooks.jlab.org/entries?start_date=1570468581&end_date=1570475781&book=RICH
> [6] https://logbooks.jlab.org/book/rich
>
> _______________________________________________
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> Dsg-rich at jlab.org<mailto:Dsg-rich at jlab.org>
> https://mailman.jlab.org/mailman/listinfo/dsg-rich
<RICH buffer tank pressure 2019-10-09 103827.png><leaky hose fitting on RICH buffer tank 2019-10-09.jpg>

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