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Models that correctly pbkp_redict the potential for corrosion in three pipelines

Abstract:

Using a theoretical outline, the potential for corrosion is calculated for three pipelines that transmit gas containing CO2, H2S, and water. The object is to determine the profiles of the corrosion rate in each of three pipelines that emulate the respective hydrodynamic and operating conditions. Having determined the pressure, temperature, and superficial velocity profiles of the phases, semiempirical models are used to estimate profiles of the corrosion rates. The pipelines are in the south of Monagas state, Venezuela. Corrosion rates using De Waard & Williams and Intevep correlations are given for the 6, 8, and 12 in. external dia pipelines at 1400, 500, and 1400 psi, respectively. The Intevep correlation gives much lower results than those using the DW&M correlation because DW&M accounts for liquid velocity in calculating the corrosion rate. The simulation shows that the corrosion rate is relatively high for the 6 and 12 in. pipelines and much lower for the 8 in. pipeline because of the relatively low pressure of 500 psi in the 8 in. pipeline.