[Dsg-rich] RICH air cooling

[Marco Mirazita]

Hi Tyler,
can we meet in the counting room at 9:15? If there is something to 
adjust, it must be done today before the hall is locked again.
Marco


Il 2018-01-16 08:11 Tyler Lemon ha scritto:
> Hello,
> 
> Looking at the archived airflow data, at the time of the issues over
> the weekend, the flows for Airflow 1 was 550 slm and Airflow 2 was 400
> slm. This is a total of 950 slm. When in EEL 124, the highest airflows
> used were 400 slm for Airflow 1 and 400 slm for Airflow 2 for a total
> of 800 slm.
> 
> The cause of the tank pressure dropping too low could be that we are
> flowing more out of the tank than the compressor can provide to the
> tank.
> 
> To resolve this, we could change the compressor's on-off cycle from
> turning on when its output pressure drops to 100 psi to turning on
> when the output pressure drops to 110 psi. This will cause the
> compressor to run more frequently and should keep the pressure in the
> air tank higher.
> 
> Changing the compressor's on-off cycle would have to be done from the
> compressor's local interface in Hall B.
> 
> Best regards,
> 
> Tyler
> 
> -------------------------
> 
> FROM: "Mirazita Marco" <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 2:38:22 PM
> SUBJECT: Re: [Dsg-rich] RICH air cooling
> 
> 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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>> 
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