Experimental study on stress calculation of directly buried heating L-shape elbows

In order to verify the accuracy of stress calculation with the finite element method for the L-shaped elbow of directly buried heating pipe, develops a DN800 directly buried heating pipeline experimental rig, and tests the strain of the L-shaped elbow at five different supply water temperatures. Compares the test values with finite element solution. The results show the correctness of the finite element model and the boundary conditions. The finite element method verified by experiment can be applied to the stress calculation of directly buried heating L-shape elbows with the arms shorter than the length of the expansion leg and pipe diameter of DN600 to DN1200.