[Dsg-rich] RICH air cooling

[Marco Mirazita]

Hi George,
it seems that the flow is going up again.
Should I try to adjust it again? Do we need to adjust the pressure 
regulator too?
Marco


Il 2018-01-16 09:48 George Jacobs ha scritto:
> Hi Marco,
> 
>  Looking at the air pressure strip chart, all I see is what I would
> expect to see. Except for when you shut the valves. That is the air
> compressor in it's normal cycle.
> 
>  Looking at the air flow cycling, this may indicate the pressure
> regulators on the air panel are turned all the way up. These should be
> adjusted to 40-50 psi to minimize the effect of the tank supply
> pressure variations on flow.
> 
>  George
> 
> On 1/16/2018 9:21 AM, Marco Mirazita wrote:
> 
>> Hi George,
>> when the flow drops to zero in the graphs, it's because I closed
>> the lines to the RICH for a while.
>> After that, the flow was more stable, but the air pressure still
>> has large fluctuations, larger than what I see on the manometer on
>> the tank.
>> Marco
>> 
>> Il 2018-01-16 09:12 George Jacobs ha scritto:
>> This may not be an air compressor issue. Flow would not go from 500
>> 
>> to 0 instantly, there would be a gradual decline. It is more likely
>> 
>> this could be a cRio or crate issue with the flow and pressure
>> interlock signals.
>> 
>> George
>> 
>> On 1/15/2018 4:59 PM, Marco Mirazita wrote:
>> 
>> Here:
>> https://logbooks.jlab.org/entry/3514198 [1] [1]
>> 
>> Il 2018-01-15 16:35 Valery Kubarovsky ha scritto:
>> Marco,
>> Could you please post the oscillation of the air pressure today
>> morning in more detail?
>> Thanks,
>> Valery
>> 
>> -------------------------
>> 
>> FROM: "Marco Mirazita" <Marco.Mirazita at lnf.infn.it>
>> TO: "Valery Kubarovsky" <vpk at jlab.org>
>> CC: "dsg-rich" <dsg-rich at jlab.org>
>> SENT: Monday, January 15, 2018 3:38:45 PM
>> SUBJECT: Re: [Dsg-rich] RICH air cooling
>> 
>> Please have a look at this logbook entry
>> https://logbooks.jlab.org/entry/3513977 [2] [2]
>> Marco
>> 
>> Il 2018-01-15 14:41 Valery Kubarovsky ha scritto:
>> Could you please post the time history for pressure and air flow?
>> Thanks,
>> Valery
>> 
>> On Jan 15, 2018, at 14:38, Marco Mirazita
>> <Marco.Mirazita at lnf.infn.it>
>> 
>> wrote:
>> 
>> I don't know exactly what happened. This morning I reduced the
>   air
> 
>>> flow of the line A from 550 to 500 and after a while the air flow
>   and
> 
>> the pressure started to go up and down.
>> Marco
>> 
>> Il 2018-01-15 14:31 Valery Kubarovsky ha scritto:
>> Hi Marco,
>> Did you investigate what happened?
>> I saw the drop in the air pressure in the tank. Was compressor
>   on
> 
>> when
>> you were in the Hall?
>> Valery
>> On Jan 15, 2018, at 14:26, Marco Mirazita
>> <Marco.Mirazita at lnf.infn.it> wrote:
>> Hi all,
>> in the last couple of days we experienced some instability in
>   the
> 
>> RICH air cooling system, resulting in the interlock shutting
>   down
> 
>> the electronics power supply.
>> The interlock limits have now been changed to avoid that.
>> Since the hall is now open till tomorrow at noon, it would be a
>   good
> 
>> opportunity to check the system.
>> Marco
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> 
>  --
>  George Jacobs
>  Jefferson Lab (TJNAF)
>  STE 12
>  12000 Jefferson Ave.
>  Newport News, VA 23606
> 
>  (office) 757-269-7115
> 
>  (cell) 757-876-0480
> 
>  (email) jacobsg at jlab.org
> 
>  (website) https://userweb.jlab.org/~jacobsg [4] [4]
> 
>  Links:
>  ------
>  [1] https://logbooks.jlab.org/entry/3514198 [1]
>  [2] https://logbooks.jlab.org/entry/3513977 [2]
>  [3] https://mailman.jlab.org/mailman/listinfo/dsg-rich [3]
>  [4] https://userweb.jlab.org/~jacobsg [4]
> 
> --
> George Jacobs
> Jefferson Lab (TJNAF)
> STE 12
> 12000 Jefferson Ave.
> Newport News, VA 23606
> 
> (office) 757-269-7115
> 
> (cell) 757-876-0480
> 
> (email) jacobsg at jlab.org
> 
> (website) https://userweb.jlab.org/~jacobsg [4]
> 
> 
> Links:
> ------
> [1] https://logbooks.jlab.org/entry/3514198
> [2] https://logbooks.jlab.org/entry/3513977
> [3] https://mailman.jlab.org/mailman/listinfo/dsg-rich
> [4] https://userweb.jlab.org/~jacobsg
> 
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