[Dsg-mvt] Gas systems

[George Jacobs]

The mixing buffer is also the pressure control buffer. As you believe the volume is currently too large, at some point the volume will become too small for proper pressure control. 

The purpose of the check valves in the mixing system is to limit purge flow to the lines requiring the purge and to prevent the back flow of flammible gas into the argon supply. 

I am on vacation today and Monday and will return Wend. 5 July 


George 


From: "Aune Stephan" <stephan.aune at cea.fr> 
To: "Matthew Marchlik" <marchlik at jlab.org>, "George Jacobs" <jacobsg at jlab.org> 
Cc: "Bob Miller" <rmiller at jlab.org>, "BERTRAND Quentin" <Quentin.BERTRAND at cea.fr> 
Sent: Friday, June 30, 2017 8:25:35 AM 
Subject: RE: Gas systems 

Hi Matt 

For the mixing volume: 
2 gal is very very large in fact 
The mini is around 0.4 l. 
1/10 of a gal is enough, it depends of what is easily available and space for all valve/tube on it. 

For the return lines (exhaust gas outside) 
We had an issue (no circulation) in the eel building for the Diam4 mm was too small for our low pressure (atm + 50 mbar) and also due to the fact that we have reduce the flow on each line to 1.5 l/h. 
We had to put diam 25 mm diameter on exhaust to avoid pressure drop on exhaust 
25 mm was available on site, I do not know the smallest value, especially for the length to go outside 

So for the exhaust in hall B I would advise a large tube, ~ 10 inch internal diameter 

Thanks 
Stephan 



-----Message d'origine----- 
De : Matthew Marchlik [mailto:marchlik at jlab.org] 
Envoyé : jeudi 29 juin 2017 22:39 
À : Aune Stephan <stephan.aune at cea.fr> 
Cc : Bob Miller <rmiller at jlab.org> 
Objet : Fwd: Gas systems 

Hi Stephan, 

George's most recent MVT gas mixing P&ID is attached. I'm working to select and size all of the components. 

It shows 2 gal mixing buffer tanks. I believe this size was selected because the smallest readily available ASME code tank was 2 gal. What is the minimum required volume of the mixing tanks? 

Thanks, 
Matt 


----- Forwarded Message ----- 
From: "Robert Miller" <rmiller at jlab.org> 
To: "Stepan Stepanyan" <stepanya at jlab.org> 
Cc: "Matthew Marchlik" <marchlik at jlab.org> 
Sent: Wednesday, June 21, 2017 9:15:35 AM 
Subject: Re: Gas systems 

Hi Stepan, 

Target - purchasing relief valves, finishing calculations on scattering chamber and target cell. Expect to be finished by July 15th. 

HTCC, N2 in Hall - these are simple systems and should be reviewed by July 30. 

MVT / MM - Brian Eng has ordered some components, Matt Marchlik (Design Authority) will look at the pressure system in July and finish by Aug 30 

LTCC - George is making a drawing for a temporary system to fill one detector. Matt will look at this system in September. We are not planning to review the full LTCC system until we find out if it will be used. 

Regards, 
Bob 


----- Original Message ----- 
From: "Stepan Stepanyan" <stepanya at jlab.org> 
To: "Bob Miller" <rmiller at jlab.org> 
Sent: Wednesday, June 21, 2017 7:59:37 AM 
Subject: Gas systems 

Hi Bob, 

Can you please summarize where we are with approval of and finishing the gas systems for everything, target, HTCC, LTCC, FT, MM, ... and whatever I forgot. 

Thanks, Stepan 

-- 
George Jacobs 
Physics Detector Support Group 
Jefferson Lab 
12000 Jefferson Ave. 
STE 12 
Newport News, VA 23606 

(office) 757-269-7115 

(cell) 757-876-0480 

(email) jacobsg at jlab.org 

(website) https://userweb.jlab.org/~jacobsg 

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