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| 40m Log |
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 Fri Dec 26 17:45:21 2014, Steve, Update, VAC, vac pressure rose to 1.3 mTorr 
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 Sun Dec 28 07:29:16 2014, Steve, Update, VAC, vacuum is normal
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Tue Feb 3 15:20:13 2015, Steve, Koji, Update, VAC, Pneumatic pressure is being read again
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Sun Mar 22 18:42:40 2015, Steve, Update, VAC, vac pressure rose to 1.2mTorr
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Mon Mar 23 10:36:55 2015, ericq, Update, VAC, Pressure watch script
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Fri Apr 24 17:30:32 2015, Jenne, Update, VAC, Pressure watch script broken
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Sat Apr 25 18:50:47 2015, ericq, Update, VAC, Pressure watch script broken
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Sat Apr 25 22:17:49 2015, rana, Update, CDS, MXstream restart script working (beta)
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Tue May 19 17:03:34 2015, Koji, Update, CDS, MXstream restart script working (beta)
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Tue May 19 18:38:33 2015, rana, Update, CDS, MXstream restart script working (beta)
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Mon Apr 27 14:37:55 2015, Steve, Update, VAC, N2 pneumatic pressure watch
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Thu Apr 30 16:30:25 2015, Steve, Update, VAC, N2 pneumatic pressure watch set up
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Tue Jan 31 14:14:29 2017, rana, Update, VAC, Pressure watch script
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Sun May 15 19:48:08 2016, Steve, Update, VAC, run out of N2
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Tue Jun 14 10:13:34 2016, Steve, Update, VAC, temporary N2 supply line
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Fri Jun 17 15:22:31 2016, gautam, Update, VAC, N2 supply line restored after retiling
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Message ID: 11156
Entry time: Sun Mar 22 18:42:40 2015
In reply to: 10843
Reply to this: 11159
12117
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| Author: |
Steve |
| Type: |
Update |
| Category: |
VAC |
| Subject: |
vac pressure rose to 1.2mTorr |
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| Quote: |
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We run out of N2 for the vacuum system. The pressure peaked at 1.3 mTorr with MC locked. V1 did not closed because the N2 pressure sensor failed.
We are back to vac normal. I will be here tomorrow to check on things.
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We run out of N2 for the vacuum system 6 hrs ago. The pressure rose to 1.2 mTorr with V1 closed. The interlock worked! See Nirogen presure reading fixed at http://nodus.ligo.caltech.edu:8080/40m/10968
The vacuum interlock: Nitrogen pressure transducer is reading the pneumatic pressure continously at the pump spool and c1vac1 processing it. When it drops below 60 PSI it closes V1 gate valve and V4 & V5. Gate valve V1 needs minimum 60 PSI to close. It is critical that V1 is closed before you run out of Nitrogen so the IFO pressure is contained.
IFO vacuum is back to Vac Normal. The MC is locked.
cc4 = 2E-6 Torr with VM1 open.
Daily N2 consumption measured to be 530PSI as 3 days on 3-27-2015 but note: it does vary !
I have seen it as high as 900 psi The long term average ~750 psi |
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