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Grant, in the design you posted 99% of the flexure will be in the bottom flange plate. There are two easy ways to avoid this; make the flange plate as thick as you can (20mm is not too thick) and put the bolt holes in the flange as close to the webbing as you can, leaving just enough clearance for a ring spanner. The top plate should be at least 10mm.
Incidentally, there is a popular misconception with respect to the primary function of the webbing plates in a permanent pier. They are not just there to add strength but also to disrupt standing waves. If the strength of the pipe varies along its length, it will not resonate.
If it were me, I would make them no less than 400mm high.
Regards
c
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