Erosion-Corrosion of 90° Carbonsteel Elbow in Potash Brine-Sand Slurries

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Abstract: Erosion-corrosion causes severe damage to potash processing pipes and usually results in more damage than the damage caused if erosion and corrosion were to act independently. In this research work, the slurry erosion-corrosion behavior of 1018 steel 90° elbows (schedule 40 – long radius) was investigated in a flow loop. Experiments were conducted using a slurry consisting of saturated potash brine as the corrosive fluid and silica sand as the erodent. The effect of flow velocity and solids concentration on the erosion-corrosion behavior of the elbow was investigated. It was found that the weight loss per unit area of tested elbows increased with increasing slurry velocity and particle concentration. Scanning electron microscopy (SEM) analysis of the exit section of the elbow showed that both corrosion and erosion contributed to the material removal process at a particle concentration of 10 wt.%. However for tests when the solids concentration was 30 wt.%, the majority of the damage was attributed to erosion. It was observed that there was a 25% synergy during erosion-corrosion at 10 wt.% particle concentration, but the synergy level decreased to 21% at 30 wt.% particle concentration.

Authors: Raheem Elemuren, Richard Evitts, Ikechukwuka Oguocha, Glyn Kennell, Akindele Odeshi, and Regan Gerspacher

Keywords: Erosion-corrosion, Potash brine, Sand, Carbon steel, Elbow, Slurry

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Page Count

8 pages

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