Process Equipment and Plant Design
The necessary wall thickness for a metallic storage vessel is a function of the

All of these
Operating pressure and welding/joint efficiency
Ultimate tensile strength (or yield point) of the material and operating temperature
Diameter of the vessel

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Remains same throughout
Decreases upwards
May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Increases upwards

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