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Qualitative Assessment of Corrosion Rate in Oilsands Slurry Pipeline

Corrosion rates in model oil sands coarse tailing slurries were investigated using a linear polarization resistance probe. Pilot-scale horizontal slurry flow loop of either unimodal (sand) or bimodal (sand and rocks) solid particles distribution mixed with municipal water.

Product Number: 51317--8951-SG
ISBN: 8951 2017 CP
Author: Kofi Freeman Adane
Publication Date: 2017
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Slurry pipeline systems are used for the extraction of bitumen from mined ore in the oil sands industry. The handling and processing of slurry results in significant pipe wall material losses. These losses are attributed to the combined effects of erosion and corrosion due to the exposure of pipe wall materials to an aerated mixture of solids (mostly silica) bitumen and water containing a high concentration of chlorides. Therefore understanding the synergistic effects of corrosion and erosion will help in developing mitigation strategies and aid in process-based maintenance schedules. This will lead to an informed design decision thereby reducing capital expenditure (CAPEX) and operation and maintenance (OPEX) cost.To contribute to the understanding of the above-mentioned challenge corrosion rates from a slurry flow loop were collected at several slurry flow conditions. The corrosion rates were estimated from linear polarization resistance (LPR). The results from LPR measurements will be presented and discussed in relation to slurry compositions solid concentration slurry flow regime and dissolved oxygen concentration. These corrosion rates provide qualitative insight into the contribution of corrosion mechanisms in pipe wall material loss rates.

Key words: Corrosion; Pipeline; Slurry; Oilsands; Flow; Flow Loop

Slurry pipeline systems are used for the extraction of bitumen from mined ore in the oil sands industry. The handling and processing of slurry results in significant pipe wall material losses. These losses are attributed to the combined effects of erosion and corrosion due to the exposure of pipe wall materials to an aerated mixture of solids (mostly silica) bitumen and water containing a high concentration of chlorides. Therefore understanding the synergistic effects of corrosion and erosion will help in developing mitigation strategies and aid in process-based maintenance schedules. This will lead to an informed design decision thereby reducing capital expenditure (CAPEX) and operation and maintenance (OPEX) cost.To contribute to the understanding of the above-mentioned challenge corrosion rates from a slurry flow loop were collected at several slurry flow conditions. The corrosion rates were estimated from linear polarization resistance (LPR). The results from LPR measurements will be presented and discussed in relation to slurry compositions solid concentration slurry flow regime and dissolved oxygen concentration. These corrosion rates provide qualitative insight into the contribution of corrosion mechanisms in pipe wall material loss rates.

Key words: Corrosion; Pipeline; Slurry; Oilsands; Flow; Flow Loop

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