Help With Pressure Vessel Design Question Please??

I am utilizing the Engineers Edge Calculator to determine the required wall thickness of a steel pressure vessel.
There are two (2) calculators, one is called "Longitudinal Shell" and the other is "Circumferential Shell"

My pressure vessel is a vertical cylindrical steel tank, 96" diameter shell, by approximately 10' tall (domed top and bottom). it will have four (4) welded legs.

Does anyone know which type of shell i have? And if you can explain the difference, i would greatly appreciate it!!

first all I need to know the material type, grade, thicknes.

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