What is a common failure mechanism for above ground atmospheric storage tanks?

What is a common failure mechanism for above ground atmospheric storage tanks?
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Answer :

Tanks constructed prior to the 1950’s are notorious for failing along the shell-to-bottom seam or on the  side seam. The principle reason for this is that these tanks were constructed before there were  established procedures and codes for such a tank (Ex/ API-650 “Welded Steel Tanks for Oil Storage”).  One of the key features of these codes and procedures was to make sure that tanks were designed to  fail along the shell-to-seam such that the liquid remained largely contained.
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