A frangible roof joint as set forth in claim 5 wherein the roof is a domed roof having a depending generally vertical lip at its periphery the upper annular plate being secured to the lip by a weld on the inside of the lip at the junction of the lip and the annular plate. The roof plates must not be welded to the tank roof structure which normally rules out externally stiffened tank roofs from being considered as being frangible. The roof plate to curb angle fillet weld must be greater than 5mm.
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