Posted by siri (22.214.171.124) on April 08, 2003 at 08:26:32:
In Reply to: Re: Re: Pressure Vessel posted by Peter on May 08, 2002 at 15:45:03:
: This equation appears to be a derivative of the basic equation for "hoop" stress in a THIN-walled
: cylinder (t = P*r/omega) where P is internal pressure, r is the mean radius of cylinder and omega is resulting hoop(circumferential)stress. The addition of the "S*E" term acts to increase the required thickness as your E (efficiency) is lowered. The - "P*E" term can be considered a factory of safety and has the same effect.
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