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Marco,<br class="">
<br class="">
Just as a FYI where those PVs come from and what they're measuring ...<br class="">
<br class="">
B_SYS_WEATHER_OUT_Press - data comes from a Facilities Management weather station on top of Hall B (sometimes it has drop outs) - units are in inHg (inch of mercury)<br class="">
B_SYS_WEATHER_SF_L3_Press - data from an absolute baratron inside of Hall B (as indicated by the name it's on Space Frame Level 3) - units are in inH2O (inch of water column)
<div class=""><br class="">
</div>
<div class="">Valery,</div>
<div class=""><br class="">
</div>
<div class="">I'd agree there is some correlation there, but maybe it's not particularly high (especially recently)?</div>
<div class="">However, the compressor is definitely acting differently since late Nov last year.</div>
<div class=""><br class="">
</div>
<div class="">Previously the compressor would cycle on and off continuously, then only some of the time, now it never does.</div>
<div class="">All 3 periods are shown in correlation plots (couldn't do long durations with earlier dates because MyaPlot would sample the data to reduce the number of points, which means can't export as a correlation plot)</div>
<div class="">- 2018 Apr - compressor always cycling on and off</div>
<div class="">- 2018 Oct - compressor cycling on and off & periods of it not</div>
<div class="">- 2019 Feb - compressor never cycling</div>
<div class=""><br class="">
</div>
<div class=""><img apple-inline="yes" id="D7D9AA47-5124-402F-83B0-0EBF0FECD7A0" src="cid:EF206C19-2E22-48AD-B15E-2258624836FD@jlab.org" class=""><img apple-inline="yes" id="120AECB6-CE87-489E-BA8F-E59D3CF7F107" src="cid:4FB69DF9-6DC5-41B2-BB87-243CF2715F0B@jlab.org" class=""><img apple-inline="yes" id="EAB1DB7D-987D-448A-92EF-AA9A46CCFEA0" src="cid:94DD3907-0136-4661-BDE7-A9503DF4271E@jlab.org" class=""><img apple-inline="yes" id="C3407A68-1D7F-4957-8FF1-23877010FFDC" src="cid:854622A8-D4A7-42EA-863D-557D0A7E4FA1@jlab.org" class=""><img apple-inline="yes" id="4B3E4636-39DC-4881-B0EC-71D861CF4BE5" src="cid:34E2CFD6-1ABC-4A48-82FD-28FE60E0FD9D@jlab.org" class=""><img apple-inline="yes" id="B659B0D4-5B25-4106-B361-53DB941BDD59" src="cid:90874DC9-A60A-432B-9020-FDE43D0B4AFD@jlab.org" class=""><br class="">
<br class="">
<blockquote type="cite" class="">On Apr 10, 2019, at 9:39 AM, Valery Kubarovsky <<a href="mailto:vpk@jlab.org" class="">vpk@jlab.org</a>> wrote:<br class="">
<br class="">
Marco,<br class="">
The correlation is visible. However, I noticed that Y-axis zero is suppressed.<br class="">
So, for weather the ratio of max to min is 1.03 but for the RICH_INTLK_AIRPRESSURE1 this ratio is 1.9.<br class="">
Regards,<br class="">
valery<br class="">
<br class="">
On 4/10/19, 08:16, "Dsg-rich on behalf of Marco Mirazita" <<a href="mailto:dsg-rich-bounces@jlab.org" class="">dsg-rich-bounces@jlab.org</a> on behalf of
<a href="mailto:Marco.Mirazita@lnf.infn.it" class="">Marco.Mirazita@lnf.infn.it</a>> wrote:<br class="">
<br class="">
Hi Tyler,<br class="">
I just noticed this nice correlation between the RICH pressure readout<br class="">
and what could be some Hall B environment pressure, in the mya viewer it<br class="">
is called HB_WEATHER->B_SYS_WEATHER_OUT_Press.<br class="">
Similarly if I plot WEATHER_L3_Press.<br class="">
Not sure what does it mean though.<br class="">
Marco<br class="">
<br class="">
<br class="">
Il 2019-04-09 23:30 <a href="mailto:tlemon@jlab.org" class="">tlemon@jlab.org</a> ha scritto:<br class="">
<blockquote type="cite" class="">RICH COMPRESSOR PRESSURE DECREASE INVESTIGATION [1]<br class="">
<br class="">
* Edit [2]<br class="">
* Delete [3]<br class="">
<br class="">
Lognumber 3677358 [1]. Submitted by tlemon [4] on Tue, 04/09/2019 -<br class="">
17:27 [5].<br class="">
<br class="">
LOGBOOKS:<br class="">
RICH [6]<br class="">
<br class="">
ENTRY MAKERS:<br class="">
beng, mcmullen<br class="">
<br class="">
ATTACHED FILES:<br class="">
<br class="">
RICH-air-compressor-investigation-photos_2019-04-09.pdf [7]<br class="">
<br class="">
Valery called notifying of low air pressure alarms for RICH's air<br class="">
cooling system. RICH air cooling buffer tank pressure had been<br class="">
steadily decreasing and was alarming at ~30 psi.<br class="">
<br class="">
At Valery's direction, we made an access to the hall to investigate<br class="">
the cause.<br class="">
<br class="">
In the hall, we noted that both the local pressure gauge on the<br class="">
cooling system buffer tank and the pressure readout on the compressor<br class="">
read ~80 psi (Fig 1 and Fig 2 in attachment). Because these two<br class="">
readouts match, it appears that the pressure transducer used for<br class="">
remote monitoring is not working correctly.<br class="">
<br class="">
We left the compressor running and the system as we found it because:<br class="">
1.) the cooling panel's regulators are set to lower than 80 psi (~35<br class="">
psi for airflow 1 and ~30 psi for airflow 2; Fig 4 in attachment)<br class="">
2.) airflows are close to their 500 slm and 400 slm set points (Fig 3<br class="">
in attachment)<br class="">
3.) the compressor's output pressure readback plot shows the pressure<br class="">
has been stable at ~80 for several days (Fig 2 in attachment).<br class="">
<br class="">
For now, Valery will lower the air pressure alarm and trip level to<br class="">
avoid the system giving further alarms or tripping off the detector.<br class="">
Airflow interlocks will remain at the same level.<br class="">
<br class="">
After the run, we will look into replacing the pressure transducer on<br class="">
the buffer tank and look further into why the compressor output<br class="">
pressure has dropped.<br class="">
<br class="">
As a side note, we also noticed the gauge on the compressor's output<br class="">
filter was in the red (Fig 5 in attachment). This will also be<br class="">
investigated after the run to see if the filter needs to be drained.<br class="">
<br class="">
<br class="">
Links:<br class="">
------<br class="">
[1] <a href="https://logbooks.jlab.org/entry/3677358" class="">https://logbooks.jlab.org/entry/3677358</a><br class="">
[2] <a href="https://logbooks.jlab.org/entry/3677358/edit?destination=email/send" class="">
https://logbooks.jlab.org/entry/3677358/edit?destination=email/send</a><br class="">
[3]<br class="">
<a href="https://logbooks.jlab.org/entry/3677358/delete?destination=email/send" class="">https://logbooks.jlab.org/entry/3677358/delete?destination=email/send</a><br class="">
[4] https://logbooks.jlab.org/user/tlemon<br class="">
[5]<br class="">
https://logbooks.jlab.org/entries?start_date=1554841638&end_date=1554848838&book=RICH<br class="">
[6] https://logbooks.jlab.org/book/rich<br class="">
[7]<br class="">
https://logbooks.jlab.org/files/2019/04/3677358/RICH-air-compressor-investigation-photos_2019-04-09.pdf<br class="">
<br class="">
_______________________________________________<br class="">
Dsg-rich mailing list<br class="">
Dsg-rich@jlab.org<br class="">
https://mailman.jlab.org/mailman/listinfo/dsg-rich<br class="">
</blockquote>
<br class="">
<br class="">
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</blockquote>
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