Describes research that evaluated the ability of the present design criteria api 650 to ensure the desired frangible joint behavior. A frangible roof joint forming a flexible gastight connection between a tank shell and a roof comprising an annular link mechanism sealingly secured at or adjacent a first edge thereof to a rim of the tank and sealingly secured at or adjacent a second edge thereof to the periphery of the roof. This can be accomplished by following design guidelines in american petroleum institute standard 650 which can be used to ensure that the roof to shell joint is frangible and that the roof will detach from the tank if over pressurized.
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