Reports until 16:05, Friday 28 October 2011
H2 SEI
hugh.radkins@LIGO.ORG - posted 16:05, Friday 28 October 2011 (1638)
BSC6, EndY ISI is in the can ready for transport--Lessons
Great effort from Jim, Mitchell, Greg & Eric.

We put BSC6 ISI in the storage container to transport to EndY.

First Lesson--The ISI Cover with the hole in the top, well that hole doesn't open quite enough to get around the mounting pads that attach the lift fixture to the ISI--see first image.
So we elected to take this cover off and just use the Crane debris catch cover--see second image.
This works pretty well but the holes are just a little small to open up enough to go around the pad--I wanted to make sure we were not pinching any cloth under the lifter.  So we'll just move the ISI with the Crane Catch in place and when the lifter comes off, we'll put the full ISI cover back on.
So next image is the 3Pt Lifter being bolted into place.  Next we see where the fabrication/QC was poor.  See Image 4, where the weldment of the lifter is not flat relative to each other.  The three very flat pads on top of our very flat keel top don't mate up very well to the lifter pads.  This really needs to be addressed as the pad was no where near metal to metal.  We'll take this to a shop and have all the pads surfaced to the same plane.
Using the 12.5ton load cell, the tri-lifter weighed 400lbs; it weighed 440 on the 1.25ton load cell.  This may suggest the load cells need calibrating.  When we picked the ISI we read 7630lbs.  Less the 400 of the lifter we have 7230.  I believe this is about 770lbs less than we expected.  So the discrepancies scale, ~10% low on the big load cell.
A poor reality of the 3pt lifter design, it doesn't hang lever for a level pick of a balanced load.  The fifth image shows how the lifter hung after we adjusted it to hoist the ISI level.  With the current weight distribution, this ISI should be very well balanced.  And this out of level hang of the lifter actually puts its lift point in the center--it all hangs together, so to speak.
OK, so the ISI is on the BSC Storage Base and we remove the lifter.  Lots of debris on the debris catch from adjusting the lifter etc, we pulled the Debris Catch Cover off and reinstalled the ISI cover.  We then added a BSC Dome Tall cover (no hole in top).  So now we have two C3 layers--this is all done in the clean room and now we roll it out--See sixth image.
Finally we pick the lid up and onto the Base.  A little N2 for good measure and we are ready to go outside.  When we get in the garage, we'll add a tarp and shes ready for the road trip.
Again, thanks to the crew for working through lunch to get this completed.
Images attached to this report