Effect of hydrodynamics and laser surface melting on erosion-corrosion of X70 steel pipe elbow in oilfield slurry
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Date
2022
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Publisher
Elsevier Ltd
Abstract
Erosion-corrosion (EC) is a significant cause of pipeline failure in the petrochemical industry. The influence of laser surface melting (LSM) on the EC of API X70 steel was investigated with simulated oilfield slurry (1.5 wt% silica sand). The slurry was circulated continuously in a closed-loop apparatus at 3 m/s velocity and EC tests were performed using electrochemical corrosion and weight loss measurements for the untreated and LSM (2.5 kW) samples located at a 90⁰ pipe elbow. Since the erodent particle velocity and the flow rate are low, the EC was dominated by corrosion. LSM samples exhibited higher EC resistance and hardness due to the surface metallurgy alteration and the EC rate varies within the pipe elbow. The primary reasons for the severe EC rates of electrodes placed at the downstream side of the elbow's extrados (outer face) are the secondary flow effect and higher sand concentration. © 2022 Elsevier Ltd
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Keywords
Computational fluid dynamics, Electrochemical corrosion, Erosion, Melting, Oil fields, Pipeline corrosion, Silica sand, Steel corrosion, Velocity control, Computational fluid dynamic, Electrochemical analysis, Erosion-corrosion, Flow loop system, Laser surface melting, Multiphase turbulent flow, Multiphases, Pipe elbow, Surface metallurgy, X70 steel pipes, Silica
Citation
International Journal of Pressure Vessels and Piping, 2022, 199, , pp. -