From: Arthur W. Brooks
Sent: Tuesday, November 07, 2006 11:27 AM
To: Thomas G. Brown
Cc: Wayne T. Reiersen
Subject: Gravity deflections of Modular Coils

Attachments: Coil Gravity Displacements.xls

Tom,

FYI - I took a look at the deflections of each of the Modular Coils just due to gravity in the vertical and 
horizontal orientations to give us an idea of how stiff the coils are and how well we need to hold them. 
For the vertical orientation, the coils are just sitting on their legs (the B has only a partial leg so 
it wants to lean to one side). The size of the deflections should be comparable but opposite in direction 
if hung from the crane at the same top locations. For the horizontal orientation I looked at two 
cases: one where it is perfectly supported along a flange face and one where it is supported at the 
four corners where the flange meets the legs. 

If the fixture for station 2 HP assembly is stiff enough, we approach the "perfectly supported along a 
flange" case where deflections are less tha .001" However, if we need to support the coil at descrete 
points, deflections could be large (.007") relative to our tolerance (.010"?). Also, if we prefit A-A 
in the horizontal orientation, we may have difficulty realigning in the vertical, particularly if one HP 
is hung and the other supported from the base.

Art