[Dsg-mvt] [Dsg-hallbgas] micromega gas mix pressures

[Marc McMullen]

Hi Francesco, 

Your flow setpoint is 9.2 but your flow in/out is only 5.0/4.7 liter per hour. So something is restricting on your end. So your system is requesting more than your are taking, this is why pressure is building in the tank. Is it possible that something is valved off? 



Marc McMullen 
Physics Division 
Detector Support Group 
7738 


From: "Francesco Bossù" <fbossu at jlab.org> 
To: dsg-mvt at jlab.org 
Sent: Wednesday, May 16, 2018 9:26:36 AM 
Subject: Re: [Dsg-mvt] [Dsg-hallbgas] micromega gas mix pressures 

Hi Marc, 

yes, the MVT group needs gas until the end of the week for testing the BMT. 

What is the simplest solution? We need to continue our test as soon as 
possible. 

Thanks 

Francesco 


On 16/05/2018 15:19, Marc McMullen wrote: 
> Hi Morgan, 
> 
> Just for clarification, please contact the MVT group and ask them to 
> check to see if their settings are appropriate. Our system will 
> continue to supply the gas as long as it is requested, so the tank 
> pressure will not decrease. 
> 
> Thanks, 
> 
> 
> Marc McMullen 
> Physics Division 
> Detector Support Group 
> 7738 
> 
> ------------------------------------------------------------------------ 
> *From: *"Marc McMullen" <mcmullen at jlab.org> 
> *To: *"Morgan Cook" <mcookiv at jlab.org> 
> *Cc: *dsg-hallbgas at jlab.org, dsg-mvt at jlab.org 
> *Sent: *Wednesday, May 16, 2018 8:58:56 AM 
> *Subject: *Re: [Dsg-hallbgas] micromega gas mix pressures 
> 
> Hi Morgan, 
> 
> It looks like there is some issue downstream of the mixing system. The 
> signals used to supply gas to the barrel (B_DET_BMT_GAS_WANTGAS) is 
> still set to supply the gas. But the pressure in the tank is at 20psi 
> which is the interlock set point to flow 0 gas. So that pressure is 
> too high. I am not sure if the MVT is trying to flow to the barrel on 
> their end or not, but if they need flow some pressure has to be 
> relieved. They either have to flow more gas down stream of tank or 
> relieve the tank. 
> 
> The signals for the MVT forward tracker and the FTT are set so they 
> will not request gas. 
> 
> 
> 
> 
> 
> Marc McMullen 
> Physics Division 
> Detector Support Group 
> 7738 
> 
> ------------------------------------------------------------------------ 
> *From: *"Morgan Cook" <mcookiv at jlab.org> 
> *To: *dsg-hallbgas at jlab.org 
> *Sent: *Wednesday, May 16, 2018 8:22:53 AM 
> *Subject: *[Dsg-hallbgas] micromega gas mix pressures 
> 
> Hi, 
> 
> Is there any particular reason why the Mix2_Press is twice it's 2 week 
> average pressure and the Mix1_Press is running at 1/2 it's 2 week average? 
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