The scope A major operator found that an isolation plug that was intended to stay in the pipework on a platform had broken free from its position and was thought to have made its way into the pipeline. Concern was raised that the plug had the potential to travel through the pipeline as far as a critical wye piece. This could be detrimental as the wye connected the pipeline with another pipeline system transporting gas from another facility. The operator asked us to carry out an assessment of the likely behaviour of the plug in the pipeline and in the wye piece. The solution We developed ANSYS CFX models to simulate the scenarios in the pipeline. From this, we determined whether the platform could be restarted without risk of pushing the plug from the pipeline into the wye. We also consider

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