How do you calculate the thickness or guage of a given metal (304 Stainless Steel for example) for a 36" dia. round, vertical cylinder water holding tank? If filled say the tank would be 25-30 feet tall. No physical pressure (pumps or vacuum) on this vessel (vented to atmosphere). Flat bottom, not a bulkhead style base. Not sure if water temp matters but for the sake of measurements if needed. Let say an air temp of 80 deg. F. and a water temp of 130 deg. F. also not sure if it matters but elevation at roughly 1000ft. above sea level.