Reports until 16:39, Thursday 07 January 2016
LHO VE
kyle.ryan@LIGO.ORG - posted 16:39, Thursday 07 January 2016 - last comment - 16:50, Thursday 07 January 2016(24754)
Manual overfill of CP3 
Manually filled CP3 -> Opened exhaust check valve bypass -> Opened LLCV bypass valve 1/2 turn ccw -> LN2 evident at exhaust after 29 minutes 30 seconds -> Closed LLCV bypass -> Closed exhaust bypass valve after several minutes -> Confirmed with Gerardo that we are performing this exercise following the same prodedure -> I cannot explain the discrepancy between the fill times between today vs. the previous fill unless the LLCV bypass valve's stop-to-stop is very course and our "1/2 turns" differ significantly.  

Next manual over fill of CP3 is scheduled for Saturday before 4:00 pm
Comments related to this report
kyle.ryan@LIGO.ORG - 16:50, Thursday 07 January 2016 (24755)
Link 

Several minutes prior to filling CP3, I had used an SS wire brush to remove the Q putty that had been applied during our leak hunting of the GNB spool a few months ago (in the VEA) to see if, by doing so, it changed the pressure in the Y-mid -> no change -> I then applied Vacseal to the previously repaired leak site on the GNB spool -> no change -> Finally, I applied Vacseal to the area around the repaired leak site -> no change 

This effort was an attempt to explain the ongoing slow pressure rise observed in the Y-mid station which began shortly after the problems with CP3 which required manual filling of CP3