直径323.9 mm管道全聚氨酯清管器的通过性能

为了评估小口径管道内复杂工况条件对全聚氨酯清管器通过性能的影响,分析可能造成清管器整体断裂的原因,现场截取直径323.9 mm的真实变形管道,利用三维数字扫描成像(Scan To 3D)技术和聚氨酯材料力学性能实验,分别建立直径323.9 mm全聚氨酯清管器通过直管单边变形和管内结垢管道的3D显式动力学仿真分析模型。通过对仿真模型进行求解,结果表明:全聚氨酯清管器针对直管段管道单边凹陷变形、直管段管道内壁结垢等工况均具有较高的通过能力,且清管效果良好。全聚氨酯清管器通过单边凹陷变形过程中产生的弯曲应力和接触应力不足以导致清管器表面出现严重划伤、皮碗撕裂及整体断裂等情况;在通过管道内壁结垢管段的过程中,前后皮碗间筒体上产生了轴向挤压大变形,同时严重的径向外扩撕扯是引起清管器筒体整体撕裂性断裂的主要原因。研究结果可为提高中国小口径全聚氨酯清管器清管方案设计水平提供指导,并可促进其工程应用的推广。

Passing capacity of all-polyurethane pig in pipeline with diameter of 323.9 mm

In order to evaluate the effect of the complicated working conditions in small diameter pipeline on the passing capacity of all-polyurethane pig,the possible causes for the whole fracture of all-polyurethane pig were analyzed.3D explicit dynamics simulation analysis models for all-polyurethane pig with diameter of 323.9 mm passing through a straight pipeline with single-sided deformation and scaled pipeline were established respectively with the Scan To 3D technology and the mechanical property test of polyurethane material based on the actually-deformed pipeline with diameter of 323.9 mm on site.Through simulation model solution and result analysis,it is found that the all-polyurethane pig has high passing capacity and good pigging effect under the conditions of single-sided dent deformation and internal wall scaling of straight pipeline.The bending stress and contact stress generated when the all-polyurethane pig passing through a single-sided dent deformation of pipeline are not sufficient to cause serious scratches on the surface,cup tearing or whole fracture of the polyurethane pig.In the process of pig passing through the scaled section of the pipeline,large axial compression deformation is generated on the barrel between the front and rear cups,and serious radial outward expansion and tearing is the main reason for the whole tearing fracture of the pig barrel.Generally,the above research conclusions have profound practical significance for improving the schematic design level and promoting the engineering application of small-diameter all-polyurethane pig in China.