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Jon,
I'm
surely not the one to answer your question but I know Carsten's point of
view on this is that it is easier to go with the "I" beam (or "H" beam) since
welding to the pressure hull is not as critical. With the "T" beam the
other side of the "T" is the pressure hull so welding is necessary.
Using the "H" beam could be considered over
kill since you are doubling the one side of the "H" but over kill can be a
good thing, but it also adds weight ( but maybe you need weight?)
I don't think that you would be able to find
available "I" beams in a circular configuration in the size you
need.
My comment
Brian
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