[Dsg-dc] dc gas system

[Morgan Cook]

Okay.  I set the controls back to automatic this morning.  We probably shouldn't keep in in manual mode overnight again, at least not with a high set point.  Mix 1 is showing 150 psi on the tank gauge.  I'd hate for that relief valve to get frozen open.  


----- Original Message -----
From: "Brian Eng" <beng at jlab.org>
To: "Morgan Cook" <mcookiv at jlab.org>
Cc: "Marc McMullen" <mcmullen at jlab.org>, "dsg-dc" <dsg-dc at jlab.org>, "George Jacobs" <jacobsg at jlab.org>
Sent: Tuesday, January 2, 2018 11:57:57 AM
Subject: Re: dc gas system

I increased the mix flow even more to try and fill the buffer tanks quicker. One of the other things we noticed was that the R1 MFC wasn't flowing the requested amount (which was seen by the valve % being very unstable around the lowest value (~8%).

The temperature in the equipment side of the gas shed was ~42F this morning, I set the thermostat to 55F.

Shortly after it got above 50F the R1 MFC appears to be working correctly (valve % is higher [currently 28% and rising] and more stable).

> On Jan 2, 2018, at 9:38 AM, Morgan Cook <mcookiv at jlab.org> wrote:
> 
> 
> Hi Brian and Marc,
> 
> Happy New Year!
> 
> So I came in this morning expecting to have to change a couple of CO2 dewars but this was not the case.  Looking at the mix tank pressure trends, the system has not been keeping up with the demand on the buffer tanks.  I set the controls to 'manual' this morning in order to refill the buffer tanks.  Will you please look into it?  
> 
> Thanks,
> Morgan