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

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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to shell and tube heat exchanger.

Baffles are supported independently of the tubes by tie rods and positioned by spacers
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter
Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

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