Difficulties that often arise when planning the use of pigs for cleaning the internal cavity of various pipeline systems from liquid and solid contamination are considered. Cylindrical cleaning pigs are made from various hyperelastic materials (polyurethane foam of different densities, elastic polymer composition, silicone sealant and silicone compound). The value of the modulus of elasticity for bending and stretching of the materials from which the pigs are made is determined. In order to assess the risks of jamming and destruction of pigs made of various hyperelastic materials in shaped elements of pipelines, laboratory experimental installations of glass and metal pipes, bends of different radii and bend angles, and reducers from larger to smaller pipe diameters were developed and assembled. The dynamics of the movement of pigs made of hyperelastic materials through bends and pipeline reducers were experimentally studied. The forces acting on the pig during its movement by such pipeline elements are described. In bends, pipeline reducers, the dynamics of pig movement is determined by the force of friction between the side surface of the cylindrical pigs and the inner wall and the force of inertia. The movement of the pig in the bend, the reducer slowed down, stopped due to the greater force of friction, which is caused by the bending and compression of the pig. On the basis of the analysis of the dynamics of the movement of the pigs by bends, reducers, the analysis of the forces acting on them, the causes of temporary stoppage, jamming, and the mechanisms of the destruction of the pigs are described. The possible negative consequences that can be caused by the temporary stoppage of pigs made of hyperelastic materials in bends, reducers of pipelines have been determined. The obtained results make it possible to understand the patterns of movement of cleaning pigs made of various hyperelastic materials through bends, pipeline reducers, to understand the reasons for their jamming and destruction in such elements
Received 18.05.2022
Revised 03.10.2022
Accepted 28.11.2022
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