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Periodic cleaning of sales gas lines often yields large quantities of material known as black powder. This paper describes a research study that was conducted to provide estimates for corrosion rates of carbon steel in TEG-water mixtures with TEG content in the range 0.0 wt% to 99.5 wt%.
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Black powder is a generic term used to describe entrained corrosion products that can accumulate in sales gas pipelines. This study was to evaluate the efficiency of model inhibitor compounds.
Black powder production is poorly understood. Steel specimens were systematically exposed to a range of CO2, H2S, and O2 partial pressures at differing water condensation rates. Hygroscopic material assisting black powder formation was also investigated.