[Dsg-rich] URGENT: RICH alarm

Tue Sep 18 14:26:18 EDT 2018

yes, I agree with Amrit.
Thank you Tyler for the excellent analysis!
---------------------------------------------------
# Patrizia Rossi
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> On 18/set/2018, at 14:22, Amrit Yegneswaran <yeg at jlab.org> wrote:
> 
> thanks for the excellent analysis tyler.
> this helps us set a baseline and endorses the fact that prior to scheduled work, we have to take appropriate action.
> for instance, the rich detector must have emergency nitrogen in the hall to switch to prior to scheduled work.
> 
> detectors are like trust,
> takes years to build , seconds to destroy, and forever to repair.
> 
> 
> From: "Tyler Lemon" <tlemon at jlab.org>
> To: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>, "dsg-rich" <dsg-rich at jlab.org>
> Cc: "Robert Miller" <rmiller at jlab.org>, "Denny Insley" <dinsley at jlab.org>
> Sent: Tuesday, September 18, 2018 2:09:09 PM
> Subject: Re: [Dsg-rich] URGENT: RICH alarm
> 
> Hello,
> 
> In addition to the relative humidity sensors, we have the moisture transducer measuring the water concentration at the N2 Exhaust line.
> 
> When N2 flow stopped there was 41.77 ppm of H2O.
> When N2 flow restarted, water concentration had increased to 46.72 ppm (4.95 ppm, or 11.86% overall, increase).
> One hour later, water concentration dropped to 44.17 ppm (2.55 ppm, or 5.46% overall, decrease).
> 
> Attached is an updated table with the moisture transducer added in the last row in blue. Also attached is a plot during this time period for the moisture transducer.
> 
> Best regards,
> Tyler
> From: "Tyler Lemon" <tlemon at jlab.org>
> To: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>, "dsg-rich" <dsg-rich at jlab.org>
> Cc: "Robert Miller" <rmiller at jlab.org>, "Denny Insley" <dinsley at jlab.org>
> Sent: Tuesday, September 18, 2018 1:44:49 PM
> Subject: Re: [Dsg-rich] URGENT: RICH alarm
> 
> Hello,
> 
> From the attached plot and table, it looks like during the time with no N2 flow, humidity increased by 0.28% RH (~ 30% overall increase from before flow loss).
> 
> After flow had been restored for one hour, the humidity had decreased by 0.18% RH (~ 16% overall decrease from when flow was restored).
> 
> Best regards,
> Tyler
> 
> From: "Amrit Yegneswaran" <yeg at jlab.org>
> To: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>
> Cc: "dsg-rich" <dsg-rich at jlab.org>, "Robert Miller" <rmiller at jlab.org>, "Denny Insley" <dinsley at jlab.org>
> Sent: Tuesday, September 18, 2018 11:02:43 AM
> Subject: Re: [Dsg-rich] URGENT: RICH alarm
> 
> denny, bob 
> in future, for scheduled work please let the RICH group know before hand.
> amrit
> 
> From: "Marco Mirazita" <Marco.Mirazita at lnf.infn.it>
> To: "Robert Miller" <rmiller at jlab.org>
> Cc: "dsg-rich" <dsg-rich at jlab.org>, "Denny Insley" <dinsley at jlab.org>
> Sent: Tuesday, September 18, 2018 10:56:28 AM
> Subject: Re: [Dsg-rich] URGENT: RICH alarm
> 
> Hi all,
> it is back now.
> Marco
> 
> 
> Il 2018-09-18 16:54 Robert Miller ha scritto:
> > Hi Tyler,
> > 
> > The N2 was stopped to add a valve; it will be back within the next 10
> > minutes.
> > 
> > Bob
> > 
> > Sent from my iPhone
> > 
> > On Sep 18, 2018, at 10:51 AM, Tyler Lemon <tlemon at jlab.org> wrote:
> > 
> >> Hello Bob and Denny,
> >> 
> >> Is there any work being done on the forward carriage nitrogen supply
> >> line?
> >> 
> >> RICH lost N2 flow and the aerogel needs to stay constantly purged by
> >> N2 to stay dry.
> >> 
> >> Tyler
> >> 
> >> -------------------------
> >> 
> >> FROM: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it>
> >> TO: rich at jlab.org, "dsg-rich" <dsg-rich at jlab.org>
> >> SENT: Tuesday, September 18, 2018 10:39:21 AM
> >> SUBJECT: [Dsg-rich] URGENT: RICH alarm
> >> 
> >> Hi all,
> >> it seems that few minutes ago the N2 flow dropped to 0.
> >> Can someone please check what is going on?
> >> Thank you
> >> Marco
> >> 
> >> _______________________________________________
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> >> Dsg-rich at jlab.org
> >> https://mailman.jlab.org/mailman/listinfo/dsg-rich [1]
> > 
> >> <n2flow.png>
> > 
> > 
> > Links:
> > ------
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> > 
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