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Entry  Mon Nov 19 14:59:48 2018, Chub, Update, VAC, Vent 81 
    Reply  Mon Nov 19 17:09:00 2018, Steve, Update, VAC, Vent 81 beforeVent82.pngvent81completed.png
       Reply  Mon Nov 19 22:01:50 2018, gautam, Update, VAC, Loose nut on valve IMG_7171.JPG
          Reply  Tue Nov 20 13:13:01 2018, gautam, Update, VAC, IMC alignment is okay 
       Reply  Mon Nov 26 15:58:48 2018, Steve, Update, VAC, Vent 81 
          Reply  Mon Nov 26 17:16:27 2018, gautam, Update, SUS, EY chamber work IMG_5251.JPG
          Reply  Thu Dec 20 10:28:43 2018, gautam, Update, VAC, Heavy doors back on for pumpdown 82 
Message ID: 14306     Entry time: Mon Nov 19 17:09:00 2018     In reply to: 14305     Reply to this: 14307   14318
Author: Steve 
Type: Update 
Category: VAC 
Subject: Vent 81 

Gautam, Aaron, Chub and Steve,

Quote:

Vent 80 is nearly complete; the instrument is almost to atmosphere.  All four ion pump gate valves have been disconnected, though the position sensors are still connected,and all annulus valves are open.  The controllers of TP1 and TP3 have been disconnected from AC power. VC1 and VC2 have been disconnected and must remained closed. Currently, the RGA is being vented through the needle valve and the RGA had been shut off at the beginning of the vent preparations.  VM1 and VM3 could not be actuated.  The condition status is still listed as Unidentified because of the disconnected valves. 

The vent 81 is completed.

4 ion pumps and cryo pump are at ~ 1-4 Torr (estimated as we have no gauges there), all other parts of the vacuum envelope are at atm. P2 & P3 gauges are out of order.

V1 and VM1 are in a locked state. We suspect this is because of some interlock logic.

TP1 and TP3 controllers are turned off.

Valve conditions as  shown: ready to be opened or closed or moved or rewired. To re-iterate: VC1, VC2, and the Ion Pump valves shouldn't be re-connected during the vac upgrade.

Thanks for all of your help.

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