Modeling and assessment of the stress-strain state of above-ground pipelines at different types of compensation sections

Z.A Besheryan,I.F Kantemirov,V.S Litvinenko

doi:10.1051/e3sconf/202126601022

Z.A Besheryan, I.F Kantemirov + Show 1 more

Open Access

https://doi.org/10.1051/e3sconf/202126601022

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Abstract

The development of Russian fuel and energy complex in the short term is connected with the development of new hydrocarbon field in the permafrost zone and the need to build Arctic pipelines north of the 60th parallel. The ground-based structural scheme of pipeline laying is the most optimal while constructing trunk pipelines in permafrost areas in the Arctic and subarctic latitudes. The actual operating conditions of these systems are insufficiently studied. The above-ground pipeline in permafrost is in an complex stress-strain state. This study presents the results of the assessment of the stress-strain state of linearly extended above-ground pipelines at different compensation sections (triangular compensator; trapezoidal compensator; U-shaped compensator) under actual operating conditions. Using the finite element method on mathematical models, the dependences of the transverse displacements of the pipeline on movable supports and stresses arising in dangerous sections of the typical pipeline section during self-compensation of deformations on the variable design parameters of the system for various load combinations were established (the simulation was carried out in the ANSYS software package).

Highlights

Construction of modern pipelines and ensuring their operational reliability are priority tasks of the whole hydrocarbon trunk pipeline transport system
This study shows the main results of work simulation and assessment ofthe stress-strained state of above-ground pipelines on various forms of compensation sections and includes general conclusions
The study of the deformability and stress state of above-ground pipelines on permafrost soils by simulating the operation of a typical section of above-ground laying in a universal software system of finite element analysis - ANSYS made it possible to establish new dependences of lateral displacements of the pipeline on the supports and the maximum stresses in the hazardous sections on possible variables of the system design parameters and with different coefficients of friction on the supports

Summary

Introduction

Construction of modern pipelines and ensuring their operational reliability are priority tasks of the whole hydrocarbon trunk pipeline transport system. Quite often trunk pipelines cross permafrost areas on their way from the field to the consumer. Temperature below freezing point (of air and soil), the unstable bearing power of most of the soils when thawed, caused by an abrupt changein their mechanicalandphysical properties,are the main factors determining the specific conditionsin permafrost environment [2]. There is an indicative shift of hydrocarbon production centers to regions with difficult permafrost conditions in the Arctic and subarctic latitudes [3]. The above-ground structural layout of pipeline construction is most optimal for such regions. The actual operating conditions of linearly extended above-ground pipelines in permafrost and the factors the ensure the operational reliability of these systems are not well studied [4]

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Discussion

Conclusion