Comparison of the rotating cylinder and pipe flow tests for flow sensitive CO{sub 2} corrosion
- Inst. for Energiteknikk, Kjeller (Norway)
- Statoil, Trondheim (Norway)
A study was carried out to investigate the effect of various hydrodynamic parameters on the corrosion rate of low carbon steel in CO{sub 2} environments. Two different flow geometries: rotating cylinder and pipe flow were studied simultaneously in the same electrolyte within a glass loop. The comparisons were carried out over a wide range of parameters: T = 20--80 C, pH 4--6, P{sub CO{sub 2}} = 0--1 bar, v = 0--13 m/s. The hydrodynamic conditions studied cover the range from static to highly turbulent flow. The corrosion process was monitored with the following electrochemical measuring techniques: polarization resistance, potentiodynamic sweep and electrochemical impedance. The comparison of the two flow geometries was carried out in terms of hydrodynamics, mass transfer and CO{sub 2} corrosion. The measured mass transfer rates were found to agree well with previously published correlations for the rotating cylinder and straight pipe flow. In case of CO{sub 2} corrosion it was possible to achieve good agreement between corrosion rates in the two flow geometries at low temperatures by having the same water chemistry and mass transfer conditions. This conclusion is valid for the case when no protective corrosion product, scale or inhibitor films are present. However, at higher temperatures films with a certain degree of protectiveness were observed. In that case lower corrosion rates were obtained on the straight pipe specimen due to more dense and protective films. The CO{sub 2} corrosion studied here is related to problems encountered in oil and gas production and transportation.
- OSTI ID:
- 106127
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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