EXPERIMENTAL STUDY OF LOAD EFFECT ON DEFORMED STATE OF ADJACENT PIPELINE SECTIONS WHEN USING A SUPPORT-CENTERING DEVICE

Abstract

The relevance of the study is due to the testing of the results of the numerical calculation of the stress-strain state of the support-centering device and pipeline in ANSYS software through an experimental study. The purpose of the work is to experimentally study the effect of the support-centering device on the pipeline when centering the boundary sections when cutting out a defective coil during emergency repairs. The object of the study is an experimental bench of a pipeline with diameter Dн = 40 mm, chosen as a prototype of a pipeline with diameter Dн = 1020 mm. Research methods: mathematical modeling, experimental research, processing of experimental data.The following results were obtained:- the maximum deformation of the end of the pipeline in a computer model of a full-scale pipeline with an applied load of 10 kN is 62.9 mm, the maximum stress is 87.2 MPa;- factors identified: load F = 0–50 N, length of the free end of the pipeline l = 0.5–1.5 m, depth of the pipeline h = 50–80 mm) and experimental response - deformation u;- during the processing of experimental values of deformations, it was revealed that the depth of the pipeline does not affect the results of measuring the displacement of the pipeline axis from applied transverse forces, therefore, it was decided to carry out measurements at a constant depth of 0.08 m;- based on the results of the experiment, graphs of theoretical and experimental dependences of the movement of the pipeline axis on the longitudinal load were constructed: the difference between the two schemes for securing the pipeline is 41 %, in the calculations it is necessary to take into account the part of the pipeline located in the ground;- the relative error of the experimental results, taking into account theoretical errors, is no more than 10 %.