(lots and lots of people)....and I want to thank ALL these people for all their help today. Everybody was willing to pitch in and help, and was fantastic that that happened.
Its been another long day and I am tired so this will be quick (more detailed report to come)....also apoogies if this alog makes no sense. My mind is mush now.
HAM5 was closed up today. ISI balance was rechecked and slightly altered, clean of chamber happened, had also to pause for some time where we had to wait until particle counts dropped to level happy to peel FC off SR3 but eventually got both doors on. We did notice that when FC pulled immediately it looked awesome, and then in the time before door went on, started to see small amounts of particulate already coming back. After doing some quick TFs in a couple DOF's it was given the okay to put doors on and they were put on as quickly as we could. We did learn various things on how to speed up, etc.
Rough timeline: 1st contant removed 11.20am 1" optic. 11.44am first contact removed from SR3 optic. North door on ~12.37pm, South door on ~13.14pm.
Changed up the order for HAM4 door and ISI was half unlocked and North door went on before started anything (discovered after door went on that first contact is still on the inside of the viewports :-(...after discussion with Mike L we will pull off the viewports at a later date to remove). From that we had to wait an awful long time trying to wait for particle counts to drop out of the hundreds. Things learned is we found counts spike when door gets put on, couldnt have the BSC chamber cross flow on as would make counts in the hundreds in HAM4, same with people trying to work in BC1, or even lifting a cover elsewhere. Eventually counts went down and we pulled FC on SR2. Unfortunately right at the end of the pull the gas bottle ran dry on the top gun :-( :-(. And immediately looking at the SR2 optic it looked bad...as if we had never used FC. After a bit of back and forth and a round table discussion it was decided we would try to first contact again with everything its its present state. That is to try to re-spray FC using the hold on cone and if that didnt work to paint on FC after first trying blow off anything that we could. We found the cone didnt work (wouldnt fit) and so we painted. Was a pain as coulndt really see it, but we got it done in the end (well done Kate and Rich for staying behind with me to get this done..your help is appreciated more than can express). So will try to pull FC again in the morning and we will see what we see.
Hopefully others will make alogs regarding particle counts, etc. ...and I may try to write a more detaield report at a later date with some photos etc depending on if they turned out when look at.
Following up on Matt's alog above and to expand on a few items.
Before we agreed to "try again" with FC at SR2 in HAM4 we had a round table with Calum, Matt, Jeff, Rich, Kate and Mike Landry. Based on the gas and the issue of higher counts in chamber we decided to try again. (We could left and dumped to bug list but we thought worth to try again.) As Matt mentions we discussed several options including re-doing it with bolt on cone, using handheld cone or brushing. To use bolt-on cone we would needed to have locked ISI, removed suspension stops etc ... and would have lost ~ 1 days work. So we gave team option of handheld cone or brushing. We went through details associated with brushing i.e. 1) clean with gas from top gun first prior to brushing 2) use new and many brushes 3) only brush if guys happy with visible inspection with green light prior to brushing 4) use new batch of FC which just arrived st LHO on 21st July 2014.
I should also add that regardless of what happens today they will move ahead with close i.e. if successful we will move on and if still "dirty" we will take photos then write up a bug report and move on.
Two recommendations from this (while not responsible for issue they are good lessons): -
1) During pulling etc ... one person should be on gas bottle / top gun duty and watching bottle pressure. I was doing this while present but didn't do a great job re-assigning it i.e. I asked Matt to re-assign rather than doing it myself. (Betsy had got 2x bottles re-filled as well so they were available.)
2) Colored or different bottles for 1:1 mix versus cleaning mix or other. Why? Later (at 4am) I remembered that Kate and I had observed that the FC spray on SR2 looked different and that particle count had been low. I wonder if I grabbed the wrong bottle from the table and perhaps sprayed with a mixture that had more thinner than polymer? This has since turned out not to be the case as was reminded we pump before use to check consistency. (Should also mention we do label bottles with mix date, mixer and exp date.) Still worth a look though on colored or different bottles.
PLEASE LOOK OUT FOR FULL ALOG ON THIS FROM KATE.
Celebrating SR2 being repainted and what an epic work week its been