[Dsg-rich] RICH air cooling

[Tyler Lemon]

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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