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[PSUBS-MAILIST] Pressure hull
To all,
The idea is to construct a very simple pressure
hull out of two torispherical endcaps.
The conning "tower" is made out of a standard line pipe with
a little overdimensioned wallthickness and the smallest possible
diameter. The endcaps are made with a small cilindrical section on it but i
am afraid that the tower will intersect with the torispherical
part.
In order to keep it simple i chose a very common
steel for the endcaps. It is P265GH (yield strenght 265 n/mm^2, 38500 psi,
tensile strenght 410 n/mm^2, 59500 psi). This is an "off the shelf"
material at Afflerbach, the german manufacturer. I think you could call it soft
boiler steel.
To calculate the strenght of it (apart from
the conningtower and viewports) one can use the formulas for a sphere,
using the dishing radius of the endcap (in this case 1040
mm). Maybe it is my age, to much alcohol or lack of intelligence
but watever method i use (ABS, Lloyd's or an old pressure vessel codebook)
i get different outcommings. Can anyone of you say something sensible on this? I
am considdering a wallthickness of 12 mm, divingdepth 100
mtr?
If it is ever going to be build it will be tested
unmanned to a depth 50% more than its safe working depth. Should it
collapse i will hold no one responsible for that. So please be free to give your
advise.
Thank you very much,
Thijs Struijs
