Monoethylene glycol (MEG) is often used to prevent formation of solid gas-hydrates in wet natural gas pipelines when low operating temperatures are expected (e.g. sealines). Glycols have a slightly inhibiting effect on CO2 corrosion, however, corrosion control methods such as pH-stabilisation or corrosion inhibition must be applied unless the CO2 partial pressure is very low. During handling and transportation the glycol may be exposed to air. Injection of oxygen-containing glycol may cause corrosion problems near the inlet of the pipeline. An experimental program has therefore been carried out to study and qualify the use of pH-stabilisation in sweet gas pipelines with oxygen ingress. Four loop experiments were performed to study the effect of dissolved O2 on CO2 corrosion of carbon steel in CO2-saturated MEG solutions with pH-stabilisation.

Subject
Films, Steel surfaces, Corrosion rate, Steel coupons, Sodium chloride, Pipelines, Corrosion loops, Corrosion reactions, Film formation, Glycol, Corrosion coupons, Risk reduction, Corrosion potential
Keywords:
CO2 corrosion, hydrate preventer, pH stabilisation, pipelines
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2005
Association for Materials Protection and Performance (AMPP)
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