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[CANREB-HRS] Vacuum Chamber <to:Canreb>

To:       Marco Marchetto                    August 28, 2014
          Jim Maloney

From:     George Clark

cc:       Reiner Kruecken
          Neil McLean, AAPS
          Cynthia Reis, AAPS
          Rotem Gazit, AAPS
          Rituparna Kanungo
          Rick Baartman
          Remy Dawson

Re:       [CANREB-HRS] Vacuum Chamber <to:Canreb>

Dear Marco & Jim,

You asked about wall thickness for the HRS vacuum chamber
assuming various materials.  The attached 140828A.pdf shows some

Basic Assumptions

    -separate vacuum chamber
    -poles do not form part of the chamber
    -maximum beam size 200 mm wide x 20 mm tall
    -Beam Stay Clear is 400 mm wide.
    -see the sketch on page 1 in 140828A.pdf

Calculation Assumptions

    -use max allowable stress from 1989 ASME Pressure Vessel Code
    -chamber is straight (not curved).
    -based on "Flat Plates for Vacuum tanks" by Robert Meuser,
     Radiation Laboratory Design Data #41 3-7-51.
    -deflections are based on Machinery's Handbook formula (21st
     Edition, Industrial Press, p.436).

The calculations are for the flat top plate.  You can assume the
edges of the plate are either "Fixed" or "supported."  The
results for both are shown on page 2 in the pdf.  I think corners
will act more like a fixed support than just a simple support.

For Aluminum (6061T651), one would use 11 mm thick wall and
expect about 1 mm deflection.

For Titanium (Grade 2), one would use 10 mm thick plate and
expect about 0.8 mm deflection.


Attachment: 140828A.pdf
Description: Adobe PDF document