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Hello. I saw a psub that was 1/2 inch thick hardened boiler plate and was
good to 1000 ft.
The builder used rolled " channel iron " at 3 inch by 1-1/2 inch. The
result was nice. The rings were rolled with the 3 inch flat to the inside, and
it was very strong while not consuming much interior space. Once welded in
place, the orientation made a " boxed " stiffener and you could crawl over them
without any discomfort. Here's a little sketch.
HULL STEEL
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CHANNEL 3 X 1-1/2
My only problem would be that you can't reach the inside to paint it or
monitor corrosion.
Frank Dalgleish.
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