Bill Jepson wrote:

Paul, One method we have used in our vacuum equipment to prevent cracks
is to provide a flex path for items that show a high enough delta T.  We
have heaters providing 400° C next to cold traps running LN2. The
solution for the muffler is to make the 3 120° ribs look like the
following JPEG. I understand the tangents into the can problem we would
just have to use good materials there. Bill Jepson

 
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