51314-4382-Top of Line Corrosion- Impact of MEG and Organic Acid in the Gas Phase

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Product Number: 51314-4382-SG

ISBN: 4382 2014 CP

Author: Arne Dugstad

Publication Date: 2014

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The Top of Line Corrosion (TLC) rate depends on a number of parameters and a lot of publications discuss the effect of temperature CO2 partial pressure organic acid content in the gas and the condensation rate. Two parameters that have not been given much attention are how glycol and the consumption and replenishment rate of organic acids in the condensed water affects the corrosion rate. When MEG is used for hydrate control in gas condensate pipelines MEG vapor will be present in the gas phase and MEG will condense together with the water. The MEG concentration in the condensing phase depends on how far the system is from equilibrium.The presence of MEG and organic acids will affect the protective properties of the corrosion product film that form in the top of the line. The film formation process has been studied in small scale experiments where steel pipes are exposed to an aqueous phase and where various condensation rates are simulated by varying the replenishment rate of the test liquid.The organic acid in the condensing water is consumed in the corrosion process and the corrosion rate will depend on how fast the organic acid is replenished. The replenishment rate has been studied in loop experiments and the results have shown that the corrosion rate can be directly related to the replenishmentment rate under certain conditions.The paper discusses the experimental approaches and the results obtained in the corrosion film formation and organic acid replenishment studies.