Frangible Tank Roof Design

That is of course if the tanks are built according to the rules for frangible roofs.

Frangible tank roof design.

This paper presents the results of an investigation into the frangible joint behavior of tanks designed to api 650 rules. Failure of the roof to shell junction can be expected to occur when the stress in the compression ring area reaches the yield point says f 6 calculated failure pressure. Api 650 gives rules for the design of frangible roof joints in fluid storage tanks. 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.

F 4 1 establishes the maximum design pressure p for a tank that has been constructed or that has had its design details established. The api 650. In such tanks the roof to shell joint is intended to fail in the event of overpressurization venting the tank and containing any remaining fluid. See figures 7 and 8.

In the event of over pressurization the frangible roof to shell joint is designed to fail before the tank shell or the shell to bottom joint. The concept of frangible roof only applies to flat bottom cone roof tanks with limited roof apex angle. 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 failure is intended to vent the tank and contain any remaining fluid.

This video documents the research and testing on frangible joint storage tanks performed at kansas state university and thunderhead engineering.