Free water prediction for corrosion protection of NGL pipelines

J. J. Puthuvelil, Saudi Aramco

Natural gas liquids (NGL) separated from natural gas carry varying concentrations of water in the form of free water, water emulsion and soluble water. Typically, free water will form once the total water concentration of NGL rises above its solubility level, and it can be separated out more efficiently by separators or coalescers. The solubility of water in the NGL is dependent on the fluid temperature and on the composition of the condensate; as a consequence, it typically ranges between 50 ppmw and 650 ppmw. Moist NGL becomes cool, and the dissolved water in it can freeze and eventually block the pipeline. Free water can also combine with corrosive gases like H2S and CO2 to form acids, wh


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