CALCULATION OF THREE-LAYER LARGE DIAMETER PIPES ON THE PC «LIRA»

Objectives This article discusses the evaluation of the possibility of application of three-layer pipelines. For this purpose, the stress-strain state of three-layer pipes under the action of internal pressure is investigated. The largest in the modern world are considered to be the main pipewater. They are mainly used to transport oil and gas from production sites to processing plants. Pipelines are intended for movement of liquid, gases and other environments and first of all it is water pipelines. As you know, main and technological pipelines are IP-elite club that cares only metal buildings, the construction of which consume Xia millions of tons of steel. On the other hand, one of the main indicators of efficiency of trunk pipelines is their material consumption. As a rule, trunk pipelines have a long length, and therefore an unreasonable increase in the even thickness of the pipe walls by at least 1 mm leads to an overspending of steel by de-siyatki and even hundreds of thousands of tons. In this regard, to the calculations of the main pipe wires for strength should be given the most serious attention.

Methods The calculation is carried out by numerical methods, namely with the help of finite element meto-da (FEM), implemented in the PC "LIRA".

Results The calculation of the pipes is performed on the load from the transported medium applied to the inner contour of the pipe. In this case, for the three-layer pipe (the first option) and for the pipes of the second and third options, the ring tensile stresses and strains were determined. The isofields of tensile and shear stresses are given, the comparative graphical dependence of ring tensile stresses is constructed.

Conclusion. The obtained numerical results showed that the selected calculation scheme (var.1), that is, the representation of the continuous section of the pipe in the form of a three-layer, is correct. The discrepancies between the data obtained are related to the rotation of the section along the radius of the pipe. In General, the results of calculations showed the possibility of using a three-layer pipe wall for transportation of various media.

Acknowledgment. This work was supported by a grant from the President of the Russian Federation (MK-6112.2018.8)

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