[Dsg-rich] RICH N2 flow at 0 slm

[Bob Miller]

Hi Tyler,

I found the RICH N2 supply valve closed.  I opened the valve and the flow now is 40 LPM.

All of the back up bottles are empty.

There is a tool bag up here in front of the RICH gas manifold.  Denny and I will investigate this issue tomorrow.

We will need to put a supply pressure alarm on this system so we know when the pressure is low and the back up system has taken over.

Regards,
Bob
________________________________
From: Bob Miller
Sent: Thursday, June 6, 2019 8:06:37 PM
To: Tyler Lemon
Cc: dsg-rich
Subject: Re: RICH N2 flow at 0 slm


Hi Tyler,


I am going to the Hall to investigate the issue.


Regards,

Bob

822-9586


________________________________
From: Tyler Lemon
Sent: Thursday, June 6, 2019 7:55 PM
To: Bob Miller
Cc: dsg-rich
Subject: RICH N2 flow at 0 slm

Hello Bob,

I got a call from someone from Hall B engineering (Sandesh I think?) saying that RICH N2 flow was at 0 slm and if I could check the RICH slow controls.

Looking at the EPICS for it, everything seems fine in regards to cRIO operation, all values were reading and all but N2 flow and N2 panel pressures looked normal. I rebooted the cRIO for good measure and nothing changed.

N2 flow 1 is at 0 slm and N2 panel pressures for main N2 supply and backup supply are at 0 psi. (see attached).

Since Sandesh said there was pressure on the main N2 supply  dewar, it seems that the flow between the dewar and N2 panel has been stopped and the back-up bank is empty.

It could be something as simple as something got valved off to RICH, or it could be that a gas line is pinched or broken somewhere. If either is the case, there isn't anything that can be done with slow controls.

Tyler
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