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API 650 roof to shell joint

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I have been asked to design a small tank (10' dia.) to
meet API 650.  It seems to me that most things are
spelled out for me in the standard but I don't see
where the weld between the roof plate and the angle at
the top of the shell is specified.  My detail is
Detail C of figure F-2.  I see the information
regarding the weld having to not exceed 3/16" for a
frangible design (which I can't meet anyway because of
the area limitation), but I don't see where this weld
is calculated.
Thanks for your assistance
Ken Peoples, P. E.


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