Numerical analysis on compensation ability of several Z-shape pipes in direct-buried heating system

Simulates several horizontally symmetrical Z-shape compensation pipes in direct-buried heating system by the finite element analysis software ANSYS. The results show that the maximum length of compensated arm increases significantly with the increase of the bend radius of curvature while the pipe diameter and the compensable arm length are the same for Z-shape compensation pipes, the maximum length of compensated arm increases significantly with the increase of the pipe diameter while the bend radius of curvature and the multiples of the elastic arm length are the same for Z-shape compensation pipes. Gains the maximum length of compensated arm while the compensable arm length is from two elbows directly connected to two times of the elastic arm length, which can be used in directly buried heating pipeline engineering projects. Fills the gap of the regulation about the maximum length of compensated arm under various compensable arm length for the Z-shape compensation pipes including the pipe diameter of DN800, DN1000 and DN1200.