Pressure vessel in a (near) vacuum

AI Thread Summary
The discussion focuses on determining the minimum thickness of a polycarbonate hemispherical head subjected to an internal pressure of 8 psi in a near vacuum environment of 2.8 torr. The user expresses confusion about the analysis required for this calculation. They note that the shell is thick and seamless, alleviating concerns about structural integrity. It is suggested to add 1 bar to the internal pressure to account for the external vacuum force. The conversation emphasizes the importance of accurate calculations in pressure vessel design.
CaptainofIron
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I don't know if its daylight savings or what, but I just can't seem to wrap my head around this analysis.

There is a polycarbonate hemispherical head with 8 psi in a near vacuum environment (2.8 torr)

Im trying to figure out what the minimum thickness is for the head.

The shell is super thick and seamless so I am not worried about it.

The OD is 3.5"
 
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Just add 1 bar to the pressure inside the head to account for the extra force due to the vacuum outside.
 

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