The pressure shown is the gauge pressure.
(a) The hoop stress is given as
(b) The axial stress is found by
(c) The maximum shear stress is determined as
If the pressure was increased to 20 psi, the new skin thickness to maintain the same level of hoop stress would be found as follows
Therefore, it takes 36% more skin thickness to carry 36% more pressure for the same level of stress in skin.
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