Answer / isaac

Sperical vessels is 2 times stronger than cylindrical. But
that is only in design point of view. When it comes to
manufacturing(rolling,forging,welding) it becomes
complicated and expensive. So they prefer Cylinderical
(doesn't have sharp Edge so stress concentration is less).
Hope u have a great day.

Answer / vira bhadarka

doesn't have sharp Edge so stress concentration is less and
can resist more pressure

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