[Dsg-rich] [EXTERNAL] Re: RICH compressor after maintenance

Thu Oct 10 03:50:08 EDT 2019

Hi Tyler and Calvin,
thank you for your good job!
It would be nice, if you didn't already do and if you have time, to 
check that also compressor 1 is working normally.
Then if you don't have planned any other test, I would ask you to turn 
the compressor off.
The humidity inside the RICH increased a bit since the compressor was 
started few days ago, but the good thing is that it is now slowly 
decreasing after your intervention.
See elog https://logbooks.jlab.org/entry/3733981.
Best regards,
Marco

Il 2019-10-09 20:18 Marco Battaglieri ha scritto:
> Tyler, Calvin,
>  good job!
>  Thanks!
>  Marco
> 
>> On 9 Oct 2019, at 10:47, Tyler Lemon <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>
>> SENT: Wednesday, October 9, 2019 8:29 AM
>> TO: Valery Kubarovsky <vpk at jlab.org>; Tyler Lemon
>> <tlemon at jlab.org>; Calvin Mealer <mealer at jlab.org>
>> CC: Stepan Stepanyan <stepanya at jlab.org>; Marco Battaglieri
>> <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>
>> SENT: Tuesday, October 8, 2019 6:27 PM
>> TO: Bob Miller <rmiller at jlab.org>
>> CC: Valery Kubarovsky <vpk at jlab.org>; Stepan Stepanyan
>> <stepanya at jlab.org>; Marco Battaglieri <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:
>> 
>> * Test it’s performance
>> * 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> on behalf of Tyler Lemon
>> <tlemon at jlab.org>
>> DATE: Tuesday, October 8, 2019 at 13:36
>> TO: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
>> CC: "dsg-rich at jlab.org" <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>
>> SENT: Tuesday, October 8, 2019 12:04 PM
>> TO: Tyler Lemon <tlemon at jlab.org>
>> CC: dsg-rich at jlab.org <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 [1]) 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 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]
>>> [2]
>> https://logbooks.jlab.org/entry/3733741/edit?destination=email/send
>> [3]
>>> [3]
>>> 
>> 
> https://logbooks.jlab.org/entry/3733741/delete?destination=email/send
>> [4]
>>> [4] https://logbooks.jlab.org/user/tlemon [5]
>>> [5]
>>> 
>> 
> https://logbooks.jlab.org/entries?start_date=1570468581&end_date=1570475781&book=RICH
>> [6]
>>> [6] https://logbooks.jlab.org/book/rich [7]
>>> 
>>> _______________________________________________
>>> Dsg-rich mailing list
>>> Dsg-rich at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/dsg-rich [8] <RICH
>> buffer tank pressure 2019-10-09 103827.png><leaky hose fitting on
>> RICH buffer tank 2019-10-09.jpg>
> 
> 
> 
> Links:
> ------
> [1] https://logbooks.jlab.org/entry/3733786
> [2] https://logbooks.jlab.org/entry/3733741
> [3] https://logbooks.jlab.org/entry/3733741/edit?destination=email/send
> [4] 
> https://logbooks.jlab.org/entry/3733741/delete?destination=email/send
> [5] https://logbooks.jlab.org/user/tlemon
> [6]
> https://logbooks.jlab.org/entries?start_date=1570468581&amp;end_date=1570475781&amp;book=RICH
> [7] https://logbooks.jlab.org/book/rich
> [8] https://mailman.jlab.org/mailman/listinfo/dsg-rich
> 
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