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I have attached the DCGAS operators manual, operators manual
appendix, and system P&I diagram. <br>
<br>
I recommend training sessions for this system. Depending on
individual experience and knowledge levels, some folks will
obviously require more training than others. In my experience,
operators cannot properly troubleshoot what they do not understand.<br>
<br>
Marc McMullen has made a manual for the cRio controls interface.<br>
<br>
George<br>
<br>
<div class="moz-cite-prefix">On 5/19/2017 7:49 AM, David Anderson
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2107023043.5356718.1495194598999.JavaMail.zimbra@jlab.org">
<pre wrap="">To follow-up Morgan's question, I would like to propose a manual of sorts be prepared with all the drawings, possible alarms and proper responses
required to deal with each alarm state.
We are flying blind without reference material......
Thanks,
David
----- Original Message -----
From: "Morgan Cook" <a class="moz-txt-link-rfc2396E" href="mailto:mcookiv@jlab.org"><mcookiv@jlab.org></a>
To: "George Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a>
Cc: "Hallb-eng" <a class="moz-txt-link-rfc2396E" href="mailto:hallb-engineering@jlab.org"><hallb-engineering@jlab.org></a>, "dsg-dc" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-dc@jlab.org"><dsg-dc@jlab.org></a>
Sent: Friday, May 19, 2017 7:37:52 AM
Subject: Re: [Hallb-engineering] DC-gas alarms
Where can I find the drawings of the dc gas system?
On Friday, May 19, 2017 6:58:48 Krister Bruhwel wrote:
Hello,
Thanks George. Just to clarify, changing dewars is a day time
activity and should be regularly checked before leaving for the
evening and weekend. With the exception of the holidays and failures,
the on call shouldn't be concerned with it. Someone please correct me
if I'm wrong, but this is the way I remember it from before.
Regards,
Krister
On Thu, May 18, 2017 at 05:02:51PM -0400, George Jacobs wrote:
</pre>
<blockquote type="cite">
<pre wrap=""> There were a couple of issues;
-> Transducer Failure
There was a hihi alarm for mix#1 storage tank. The problem
associated with too high a pressure in the tank is typically, that the
CO2 supply pressure is too low to flow the sufficient gas to produce a
10% CO2 in argon mixture. The mix#1 pressure transducer failed,
resulting in a rapidly changing signal that crisscrossed the alarm
sepoint, resulting in multiple alarms. I have installed a replacement,
and am waiting for the new signal to be set up in the cRio.
-> CO2 Pressure is too low to maintain 10% mix ratio.
CO2 dewars arrive with a variety of pressures, from pressure too
low to use as is, to some with pressure too high and already venting
from the relief valve. The DC Gas mixing system CO2 supply must be
monitored several times daily to insure proper mixing system operation.
If the CO2 pressure is too low, the 10% mix ratio will not be 10%. In
order to closely monitor the CO2 supply, I have installed a new
pressure transducer to monitor CO2 gas supply pressure to the MFCs.
There is a lolo alarm at 100 psi. This alarm should be turned on.
If you get this alarm, the following actions are required.
1) Check that the CO2 supply pressure at the CO2 pressure regulator
outlet pressure gauge on the outside wall of the gas shed matches the
alarm value.
2) Check the CO2 gas supply valves are open on the connected dewars,
flex lines, and pressure regulator outlet valves
3) Check individual CO2 dewar pressures - carefully adjust the pressure
buildup valve to increase CO2 supply pressure (This takes several hours
to come to an equilibrium)
4) Replace empty CO2 dewars
5) Verify the CO2 pressure regulators on the gas shed wall are set
properly.
George
On 5/17/2017 5:43 PM, Denny Insley wrote:
Hello all,
Krister gave me a call this evening because he was getting constant alarms fr
om DC-Gas. I logged in and took a look at
things and found the #1 mixing tank pressure and the C02 before the MFC's in maj
or alarm. Both #1 and #2 CO2 flow indicators
show around 2lpm flow. Krister tried to call George, then talked to Bob. It was
decided to wait till morning so I disabled both
alarms in the alarm handler so Krister could keep the phone on.
Denny
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--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) [<a class="moz-txt-link-abbreviated" href="mailto:3]jacobsg@jlab.org">3]jacobsg@jlab.org</a>
(website) [4]<a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a>
References
1. <a class="moz-txt-link-freetext" href="mailto:Hallb-engineering@jlab.org">mailto:Hallb-engineering@jlab.org</a>
2. <a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/hallb-engineering">https://mailman.jlab.org/mailman/listinfo/hallb-engineering</a>
3. <a class="moz-txt-link-freetext" href="mailto:jacobsg@jlab.org">mailto:jacobsg@jlab.org</a>
4. <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a>
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">_______________________________________________
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<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/hallb-engineering">https://mailman.jlab.org/mailman/listinfo/hallb-engineering</a>
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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