Process Equipment and Plant Design
Lug support is

Same as bracket support
The most suitable for thick vertical vessel
All of these
Provided usually for vessels of much smaller height than skirt supported vessels

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Process Equipment and Plant Design
Generally, elliptical dished heads

Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²
Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
All of these

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