Stress analysis of new tee reinforced structure for directly buried heating pipelines

Aiming at the problem of excessive stress at the stamped tee of the direct-buried heating pipeline, a new tee reinforced structure is proposed, which aims to fundamentally reduce the stress at the intersection of the tee and improve the safety of pipeline laying. Through finite element numerical simulation, the maximum stress and stress distribution law of the new tee reinforced structure and the ordinary stamped tee structure are compared and analysed. The influences of the structural parameters of the reinforced model such as the fin width, fin height, outer casing wall thickness, fin angle, etc. on the maximum stress of the stamped tee are systematically studied. The results show that the new tee reinforced structure could effectively reduce the maximum stress of the stamped tee, and the smaller the main pipe diameter and the branch-main pipe diameter ratio, the more obvious the reduction effect of the maximum stress. In addition, as the fin width, fin height and outer casing wall thickness increase, the maximum stress of the new tee reinforced structure decreases.