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<div>Good Morning,<br>
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<div><br data-mce-bogus="1">
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<div>Both George and I have manuals for the gas system to help
Hall B Mechanica/Engineering with both day to day and on-call
operations. George has written individual manuals for each
system, mine is all encompassing on the controls software.
George may have updates to the gas system hardware manuals, I
will be updating the pictures in the controls manual, everything
looks similar but some things have changed cosmetically...but
operation is the same. The DC manuals are attached.<br
data-mce-bogus="1">
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<div><br data-mce-bogus="1">
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<div>I have done demos with Morgan, Denny, and Krister on controls
operations, but there will still be formal training on system
operation conducted by the DSG. We will arrange a schedule
shortly.<br data-mce-bogus="1">
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<div><br>
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<div id="ab189264-81e5-4e73-9b7a-74ec568a5381"
data-marker="__SIG_PRE__">Marc McMullen<br>
Physics Division<br>
Detector Support Group<br>
7738</div>
<div><br>
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<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Dave Kashy"
<a class="moz-txt-link-rfc2396E" href="mailto:kashy@jlab.org"><kashy@jlab.org></a><br>
<b>To: </b>"Michael R. Zarecky" <a class="moz-txt-link-rfc2396E" href="mailto:zarecky@jlab.org"><zarecky@jlab.org></a><br>
<b>Cc: </b>"hallb-engineering"
<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><br>
<b>Sent: </b>Friday, May 19, 2017 8:52:05 AM<br>
<b>Subject: </b>Re: [Dsg-dc] [Hallb-engineering] DC-gas alarms<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">Attached is the version that we
used for the pressure systems review.<br>
I know George was or is making some further improvements to the
drawing to properly reflect more details.<br>
This will help to start to learn the system since we are
operating it but the drawing should be finalized and signed off
in document control when possible.<br>
<br>
Dave<br>
<br>
<br>
<br>
----- Original Message -----<br>
From: "Michael R. Zarecky" <a class="moz-txt-link-rfc2396E" href="mailto:zarecky@jlab.org"><zarecky@jlab.org></a><br>
To: "Morgan Cook" <a class="moz-txt-link-rfc2396E" href="mailto:mcookiv@jlab.org"><mcookiv@jlab.org></a><br>
Cc: "dsg-dc" <a class="moz-txt-link-rfc2396E" href="mailto:dsg-dc@jlab.org"><dsg-dc@jlab.org></a>, "hallb-engineering"
<a class="moz-txt-link-rfc2396E" href="mailto:hallb-engineering@jlab.org"><hallb-engineering@jlab.org></a><br>
Sent: Friday, May 19, 2017 7:47:21 AM<br>
Subject: Re: [Hallb-engineering] DC-gas alarms<br>
<br>
The drawing number is B00000-01-25-0001.<br>
Has never been sent to Document Control?<br>
Either Dave Kashy or George has the original.<br>
<br>
Mike Zarecky<br>
<br>
----- Original Message -----<br>
From: "Morgan Cook" <a class="moz-txt-link-rfc2396E" href="mailto:mcookiv@jlab.org"><mcookiv@jlab.org></a><br>
To: "George Jacobs" <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a><br>
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><br>
Sent: Friday, May 19, 2017 7:37:52 AM<br>
Subject: Re: [Hallb-engineering] DC-gas alarms<br>
<br>
<br>
Where can I find the drawings of the dc gas system? <br>
<br>
On Friday, May 19, 2017 6:58:48 Krister Bruhwel wrote:<br>
<br>
Hello,<br>
<br>
Thanks George. Just to clarify, changing dewars is a day time <br>
activity and should be regularly checked before leaving for the
<br>
evening and weekend. With the exception of the holidays and
failures, <br>
the on call shouldn't be concerned with it. Someone please
correct me <br>
if I'm wrong, but this is the way I remember it from before. <br>
<br>
Regards,<br>
Krister<br>
<br>
On Thu, May 18, 2017 at 05:02:51PM -0400, George Jacobs wrote:<br>
> There were a couple of issues;<br>
> -> Transducer Failure<br>
> There was a hihi alarm for mix#1 storage tank. The
problem<br>
> associated with too high a pressure in the tank is
typically, that the<br>
> CO2 supply pressure is too low to flow the sufficient
gas to produce a<br>
> 10% CO2 in argon mixture. The mix#1 pressure transducer
failed,<br>
> resulting in a rapidly changing signal that crisscrossed
the alarm<br>
> sepoint, resulting in multiple alarms. I have installed
a replacement,<br>
> and am waiting for the new signal to be set up in the
cRio.<br>
> -> CO2 Pressure is too low to maintain 10% mix ratio.<br>
> CO2 dewars arrive with a variety of pressures, from
pressure too<br>
> low to use as is, to some with pressure too high and
already venting<br>
> from the relief valve. The DC Gas mixing system CO2
supply must be<br>
> monitored several times daily to insure proper mixing
system operation.<br>
> If the CO2 pressure is too low, the 10% mix ratio will
not be 10%. In<br>
> order to closely monitor the CO2 supply, I have
installed a new<br>
> pressure transducer to monitor CO2 gas supply pressure
to the MFCs.<br>
> There is a lolo alarm at 100 psi. This alarm should be
turned on.<br>
> If you get this alarm, the following actions are
required.<br>
> 1) Check that the CO2 supply pressure at the CO2
pressure regulator<br>
> outlet pressure gauge on the outside wall of the gas
shed matches the<br>
> alarm value.<br>
> 2) Check the CO2 gas supply valves are open on the
connected dewars,<br>
> flex lines, and pressure regulator outlet valves<br>
> 3) Check individual CO2 dewar pressures - carefully
adjust the pressure<br>
> buildup valve to increase CO2 supply pressure (This
takes several hours<br>
> to come to an equilibrium)<br>
> 4) Replace empty CO2 dewars<br>
> 5) Verify the CO2 pressure regulators on the gas shed
wall are set<br>
> properly.<br>
> George<br>
> <br>
> On 5/17/2017 5:43 PM, Denny Insley wrote:<br>
> <br>
> Hello all,<br>
> <br>
> Krister gave me a call this evening because he was
getting constant alarms fr<br>
> om DC-Gas. I logged in and took a look at<br>
> things and found the #1 mixing tank pressure and the C02
before the MFC's in maj<br>
> or alarm. Both #1 and #2 CO2 flow indicators<br>
> show around 2lpm flow. Krister tried to call George, then
talked to Bob. It was<br>
> decided to wait till morning so I disabled both<br>
> alarms in the alarm handler so Krister could keep the phone
on.<br>
> <br>
> Denny<br>
> <br>
> _______________________________________________<br>
> Hallb-engineering mailing list<br>
> [<a class="moz-txt-link-abbreviated" href="mailto:1]Hallb-engineering@jlab.org">1]Hallb-engineering@jlab.org</a><br>
>
[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><br>
> <br>
> --<br>
> George Jacobs<br>
> Jefferson Lab (TJNAF)<br>
> STE 12<br>
> 12000 Jefferson Ave.<br>
> Newport News, VA 23606<br>
> <br>
> (office) 757-269-7115<br>
> <br>
> (cell) 757-876-0480<br>
> <br>
> (email) [<a class="moz-txt-link-abbreviated" href="mailto:3]jacobsg@jlab.org">3]jacobsg@jlab.org</a><br>
> <br>
> (website) [4]<a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a><br>
> <br>
> References<br>
> <br>
> 1. <a class="moz-txt-link-freetext" href="mailto:Hallb-engineering@jlab.org">mailto:Hallb-engineering@jlab.org</a><br>
> 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><br>
> 3. <a class="moz-txt-link-freetext" href="mailto:jacobsg@jlab.org">mailto:jacobsg@jlab.org</a><br>
> 4. <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a><br>
<br>
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<br>
<br>
-- <br>
――――――――――――――――――――――――――――――――――――――――――――――――――<br>
Krister Bruhwel : Jefferson Lab : (757) 269-7868 <br>
――――――――――――――――――――――――――――――――――――――――――――――――――<br>
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