[Dsg-rich] [New Logentry] RICH compressor pressure decrease investigation

[Marco Mirazita]

Hi Tyler,
I just noticed this nice correlation between the RICH pressure readout 
and what could be some Hall B environment pressure, in the mya viewer it 
is called HB_WEATHER->B_SYS_WEATHER_OUT_Press.
Similarly if I plot WEATHER_L3_Press.
Not sure what does it mean though.
Marco


Il 2019-04-09 23:30 tlemon at jlab.org ha scritto:
> RICH COMPRESSOR PRESSURE DECREASE INVESTIGATION [1]
> 
> 	* Edit [2]
> 	* Delete [3]
> 
>  Lognumber 3677358 [1]. Submitted by tlemon [4] on Tue, 04/09/2019 -
> 17:27 [5].
> 
> 		LOGBOOKS:
> 		RICH [6]
> 
> 		ENTRY MAKERS:
> 		beng, mcmullen
> 
> 		ATTACHED FILES:
> 
> RICH-air-compressor-investigation-photos_2019-04-09.pdf [7]
> 
> Valery called notifying of low air pressure alarms for RICH's air
> cooling system. RICH air cooling buffer tank pressure had been
> steadily decreasing and was alarming at ~30 psi.
> 
> At Valery's direction, we made an access to the hall to investigate
> the cause.
> 
> In the hall, we noted that both the local pressure gauge on the
> cooling system buffer tank and the pressure readout on the compressor
> read ~80 psi (Fig 1 and Fig 2 in attachment). Because these two
> readouts match, it appears that the pressure transducer used for
> remote monitoring is not working correctly.
> 
> We left the compressor running and the system as we found it because:
>  1.) the cooling panel's regulators are set to lower than 80 psi (~35
> psi for airflow 1 and ~30 psi for airflow 2; Fig 4 in attachment)
>  2.) airflows are close to their 500 slm and 400 slm set points (Fig 3
> in attachment)
>  3.) the compressor's output pressure readback plot shows the pressure
> has been stable at ~80 for several days (Fig 2 in attachment).
> 
> For now, Valery will lower the air pressure alarm and trip level to
> avoid the system giving further alarms or tripping off the detector.
> Airflow interlocks will remain at the same level.
> 
> After the run, we will look into replacing the pressure transducer on
> the buffer tank and look further into why the compressor output
> pressure has dropped.
> 
> As a side note, we also noticed the gauge on the compressor's output
> filter was in the red (Fig 5 in attachment). This will also be
> investigated after the run to see if the filter needs to be drained.
> 
> 
> Links:
> ------
> [1] https://logbooks.jlab.org/entry/3677358
> [2] https://logbooks.jlab.org/entry/3677358/edit?destination=email/send
> [3] 
> https://logbooks.jlab.org/entry/3677358/delete?destination=email/send
> [4] https://logbooks.jlab.org/user/tlemon
> [5]
> https://logbooks.jlab.org/entries?start_date=1554841638&end_date=1554848838&book=RICH
> [6] https://logbooks.jlab.org/book/rich
> [7]
> https://logbooks.jlab.org/files/2019/04/3677358/RICH-air-compressor-investigation-photos_2019-04-09.pdf
> 
> _______________________________________________
> Dsg-rich mailing list
> Dsg-rich at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-rich
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