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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: 12195
Entry time: Fri Jun 17 15:22:31 2016
In reply to: 12174
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Author: |
gautam |
Type: |
Update |
Category: |
VAC |
Subject: |
N2 supply line restored after retiling |
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Quote: |
The drill room floor will be retiled Thursday, June 16. Temporary nitrogen line set up will allow emptying the hole area.
Ifo room entry will be through control room.
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The retiling work has finished, Steve and I restored the N2 supply configuration to its normal state. The sequence of steps followed was:
- Went to the X end and closed the following valves, roughly in this order: VAEE, VAEV, VABS, VABSCI, VASV, VASE, V4, V1.
- Checked the RPM on the various turbo pump controllers to make sure they were in their nominal states
- Disconnect the electrical connections to V1, V4, V5 and VA6 - just to make sure some spurious signal doesn't unintentionally open any of these valves while we are mucking around with the N2 supply
- Close the valves on the N2 cylinders in the drill room. Disconnect the temporary nitrogen line (at this point, the N2 pressure to the IFO valves goes down from ~7-PSI to 0), reconnect the old supply chain, taking care that we aren't unintentionally loosening any of the Swagelock connections while unscrewing stuff
- Replaced one of the N2 cylinders that was running low.
- Reopen the cylinders, restore N2 pressure to IFO valves to ~70PSI.
- Do steps 1-3 in reverse: i.e. reconnect power to all valves, open them in the reverse order we closed them while monitoring the state of the various turbo pumps.
- Acknowledged the error message on the C0VAC medm screen
Note: the valve isolating the RGA automatically shutoff during this work, possibly because it detected a pressure above its threshold - after checking the appropriate pressure gauges, we reopened this valve as well.
The attached screenshot suggests that everything went as planned and that the vacuum system is back to normal...
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