The effect of in-service degradation on the deformation behavior of the material of gas mains in soil acid electrolytes has been studied, and it has been shown that depending on the concentration of the corrosive components of the environment, the strain increment can be up to 20-30%. It has been found that in soil acid electrolytes, degraded pipeline steel shows a tendency to sudden strain jumps, which can cause spontaneous depressurization of the pipeline.
The analytical models for calculating the performance of vehicles used to transport fertilizers have been developed. The durability of undercarriages elements is estimated with consideration of kinetic equations for determining the periods of nucleation and propagation of cracks. The formulas for determining the durability of П-shaped thin-walled sections as the sum of the periods of nucleation and subcritical growth of corrosion-fatigue cracks in metal structures of vehicles, depending on the conditions of operation, are applied as well.
Purpose: To investigate the strength of tees with regard to their erosion wear, it is necessary
to consider the complex three-dimensional geometric shape of the erosion worn inner
surface of the tee. In addition, the study of the strength of the erosion worn tees of the main
gas pipelines is complicated by the occurrence of additional stresses caused by changes in
the direction of movement of the gas stream, resulting in an uneven pressure distribution in
the inner cavity of the tee, and the temperature difference in its walls.
Design/methodology/approach: Methodology for complex numerical three-dimensional
simulation of the stressed state of tees of the main gas pipelines, taking into account the
gas-dynamic processes that occur in the places of these defects, erosion wear of the tee
wall, temperature difference in the tee walls.
Findings: The acceptable parameters of erosion defects of tees of gas pipelines, and
residual life of tees with erosion defects of the wall should be determined.
Research limitations/implications: The developed model does not take into account
internal corrosion and corrosion products as an additional erosion factor. Further studies
plan to develop a model of corrosion-erosion wear of pipeline elements.
Practical implications: The developed technique allows determining the location of
erosion defects, estimating the strength and determining the residual life of tees with erosion
wear of the wall in order to ensure their reliability, to rank such defects according to the
degree of danger, to determine which of them are critical and need an immediate repair.
Originality/value: Based on the gas-dynamic processes occurring in the internal cavity of
the main gas pipelines’ tees, the complex three-dimensional geometric form of wall erosion
defects, and temperature difference, the technique of three-dimensional simulation of stress
state of the main gas pipelines’ tees is developed.
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