Dr. Aidan O'Donoghue, Pipeline Research Limited, UK, illustrates how to determine pig dynamics through modelling. Pigging in gas pipelines can result in unsteady velocity or motion due to the compressibility of the gas and variations in pig friction with the pipe wall. Local accelerations and decelerations are known as 'velocity excursions' and such events can cause out-of-specification velocities for inspection tools, dangerous loads on bends, possible pig damage or difficult receipt conditions. Combined with changes in product flowrates, the velocity of the pig can change continuously as the pig negotiates the pipeline, making prediction of the arrival time difficult and overall control of the pigging operation less than optimal.
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机译：英国Pipeline Research Limited博士艾丹O'Donoghue博士说明了如何通过建模来确定猪动力学。 由于气体的可压缩性和与管壁的猪摩擦的压缩，输出气体管道中的流速可能导致不稳定的速度或运动。 当地加速和减速称为“速度偏移”，此类事件可能导致检查工具的规范速度，弯曲危险载荷，可能的猪损坏或难以收入条件。 结合产物流量的变化，猪的速度可以随着猪谈判管道而连续变化，使得预测到达时间困难，整体控制的流量小于最佳。
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