<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
</head>
<body dir="ltr">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;" dir="ltr">
<p style="margin-top:0;margin-bottom:0">Hi Tyler,</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I am going to the Hall to investigate the issue.</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<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>
<br>
<br>
<div style="color: rgb(0, 0, 0);">
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><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>
<div> </div>
</div>
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Hello Bob, </div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Tyler</div>
</div>
</div>
</div>
</body>
</html>