期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2019
卷号：2
期号：1
页码：28-38
DOI：10.15587/1729-4061.2019.164351
语种：English
出版社：PC Technology Center
摘要：The technology of trenchless reconstruction of pipeline communications has been developed by pulling a new polyethylene pipeline into a worn-out steel traction by the pig. The pig moves under the pressure of air supplied into the trans-pig space by the compressor.Mathematical and CFD modeling of the process of pulling the pipeline by a pig is performed. Formulas for calculating the resistance forces acting on the moving system, the pressure at the compressor outlet, at which the pig will extend a new polyethylene pipeline with the entire length of the reconstructed worn steel pipeline, are derived. The resistance forces acting on the moving system on horizontal sections of the route are: the force of mechanical friction of the pig cuffs against the walls of the steel pipeline; friction force of polyethylene pipe to steel; friction force of the polyethylene pipe in the ring cuffs of the sealing system.The results of CFD simulations are visualized in the postprocessor of the Ansys Fluent software package by drawing flow lines, speed vectors, pressure fields on the contours and in the longitudinal section of the annular and rotary space. The exact values of speed, pressure at various points of the annular and rotary space are determined. The structure of the air flow in the trans-pig and annular space is investigated. Places slowing down and accelerating the flow of air, falling and rising pressure are identified. The pressure losses in the annular space are determined.After performing experimental tests, it is found that the developed «Pulling pigP» technology can be used for the reconstruction of pipeline communications. According to the results of experimental measurements, graphs of changes in air pressure at the beginning of the pipeline in time are constructed when the pulling a polyethylene pipe into worn-out steel by the pig. The pressure at the beginning of the pipeline before the start of pulling increases, due to the force of static friction. After the start of pulling, the pressure decreases by a small amount, and during pulling, its slight increase occurs. The graphs of dependence of the pulling speed on the air volume flow and on the length of the pulled section of the polyethylene pipe are constructed. At the initial stage, the pulling speed increases dramatically and after such growth stabilizes
