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Hi Tyler,<br>
<br>
I found the RICH N2 supply valve closed. I opened the valve and the flow now is 40 LPM.<br>
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All of the back up bottles are empty. <br>
<br>
There is a tool bag up here in front of the RICH gas manifold. Denny and I will investigate this issue tomorrow.<br>
<br>
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.<br>
<br>
Regards,<br>
Bob
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Bob Miller<br>
<b>Sent:</b> Thursday, June 6, 2019 8:06:37 PM<br>
<b>To:</b> Tyler Lemon<br>
<b>Cc:</b> dsg-rich<br>
<b>Subject:</b> Re: RICH N2 flow at 0 slm</font>
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<p style="margin-top:0; margin-bottom:0">Hi Tyler,</p>
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<p style="margin-top:0; margin-bottom:0">I am going to the Hall to investigate the issue.</p>
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<p style="margin-top:0; margin-bottom:0">Regards,</p>
<p style="margin-top:0; margin-bottom:0">Bob </p>
<p style="margin-top:0; margin-bottom:0">822-9586</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Tyler Lemon<br>
<b>Sent:</b> Thursday, June 6, 2019 7:55 PM<br>
<b>To:</b> Bob Miller<br>
<b>Cc:</b> dsg-rich<br>
<b>Subject:</b> RICH N2 flow at 0 slm</font>
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Hello Bob, </div>
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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.</div>
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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.</div>
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N2 flow 1 is at 0 slm and N2 panel pressures for main N2 supply and backup supply are at 0 psi. (see attached).</div>
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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.</div>
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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.</div>
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Tyler</div>
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