Flow Accelerated Corrosion Mornitoring of X65 Pipeline Based on Ring Pair Electrical Resistance Sensor

A flow accelerated corrosion test was carried out in a flow loop of pipeline with an inner diameter of 150 mm under the condition of variable flow rate, and the law of flow accelerated corrosion in X65 pipeline was monitored by ring pair electrical resistance sensor (RPERS). Computational fluid dynamics (CFD) analysis was performed on the flow field of the target pipeline segment in each flow rate state. The corrosion morphology of the measuring ring of the RPERS, that is, the circumferential direction of the pipeline, was observed using digital camera and scanning electron microscopy. The results indicate that the outer wall of the pipeline suffered more severe corrosion damage than the inner wall due to the influence of elbows. The CFD results show that the flow rates and wall shear stresses around the outer wall were higher than those of the inner wall. However, the flow accelerated corrosion did not completely depend on the distribution of flow field. The morphology results show that the accumulation of rust layer had an obvious effect on the corrosion law of X65 pipeline.