GB50341-2014: Torque on the joint between the tank wall and bottom plate due to internal pressure
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On page P79 of the specifications, the torque generated by internal pressure is described as the torque resulting from the lifting force exerted by internal pressure. What I don’t understand is that internal pressure exerts an upward force on the top of the pipe, while at the same time exerting a downward force on the bottom of the pipe; since the forces are in balance, where does the torque due to internal pressure come from?
Under internal pressure, the flat bottom bulges and develops into a spherical shape; therefore, the so-called lifting force refers to the effect on the large gusset joints and the anchoring of the storage tank. When the lifting force is less than the weight of the empty tank (excluding the tank bottom plate), the tank body, under internal pressure, has no effect on the large corner joints or the anchoring elements.