Abstract

The interface zone of the wall and bottom of the vertical cylindrical steel tank (VST) is the most loaded part of the structure, which operates in a complex stress state. As a result of cyclic loads in places of stress concentration due to low-cycle fatigue and corrosive wear of the metal in the joint zone of the wall and the bottom of the VST the defects inevitably occur resulting in reliability decrease and service life of the tank. It is proposed to replace the T-shaped welding joint of the wall with the bottom with a part of the toroidal ring. At the same time to ensure the stability of the tank along the entire contour of the wall under the toroidal transition it is proposed to install a thrust bearing with fixing plates. The results of the calculations of the stress-strain state in the interface zone of the wall and the bottom showed that the proposed design will significantly reduce the occurring stresses, increase reliability, increase the period between repairs and extend the service life of tanks which will significantly reduce the cost of operating tank farms.

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