Corrosion rates in model oil sands coarse tailing slurries were investigated using a linear polarization resistance probe. The study was conducted in a pilot-scale horizontal slurry flow loop. Slurry consisted of either unimodal (sand) or bimodal (sand and rocks) solid particles distribution mixed with municipal water. The sand had median size, d50 ranges from 0.240 to 0.776 mm (9.4 to 30 mils) and spread (d90 / d10) ratios in the range of 1.9 to 3.1. The rocks size ranged from 6 to 12 mm (0.25 to 0.5 inches). The study was done in a 193.7 mm (7.625 inches) carbon steel pipe flow loop with mixture velocity and solids concentration of 4.1-6.0 m/s and 19.3-29.1 v/v%, respectively. The oxygen was injected to achieve dissolved oxygen concentration of 1.0 ppm to 11.7 ppm. In general, the presence of the solids affected the corrosion rates measured using the linear polarization resistance probe. The slurry effect on corrosion was not linear but depends highly on slurry flow regime and dissolved oxygen concentration.

Subject
Water, Piping, Slurry, Flow loop, Sand, Corrosion rate, Rocks, Probes, Solids, Pipelines, Fluids, Oxygen, Dissolved oxygen
Keywords:
Corrosion, Pipeline, Slurry, Oil sands, Flow, Flow Loop
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2017
Association for Materials Protection and Performance (AMPP)
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