Effect of PIG's physical parameters on dynamic behavior of above ground pipeline in pigging operation

摘要

in this paper, the effects of PIG (Pipeline Inspection Gauge) parameters on dynamic response of a simply supported Above-Ground pipeline are investigated during pigging operation. The approach is based on finite element modeling verified by the experimental modal analysis (EMA). In the author's previous study, the governing equations of motion for system (Pipe, PIG as a moving vibrational sub-system, and conveyed fluid) were obtained using Hamilton's principle. In the present study, extracted equation are developed based on PIGs with different geometric parameters. The modal parameters of the pipeline system are calculated in the intermittent passage of PIGs along the pipe under different flow rates and their variations are extracted. Theoretical and experimental studies are performed to determine the effect various PIG parameters have on dynamic behavior of pipeline system. Changes in the system natural frequencies due to the speed and position of PIG in the pipe are also investigated. Moreover, displacement analysis for the mid-span of the considered pipe during the pigging operation is conducted using suggested theoretical model. Both numerical and experimental results show the substantial effects of PIG physical parameters, especially disc number and material, on dynamic behavior of the pipe system.