Erosion-corrosion of a carbon steel elbow in a carbon dioxide environment
- Univ. of Tulsa, OK (United States)
For many conditions, erosion-corrosion can produce higher wall penetration rates than erosion or corrosion alone. While flow velocity generally is believed to be an important factor, more information is needed on the influence of flow conditions. A flow loop was used to study erosion-corrosion of carbon steel elbows in a carbon dioxide environment with sand entrained in the flowing liquid. Three typical behaviors were found. At low velocities, a protective iron carbonate scale formed over all surfaces of the elbow, and corrosion rates were very low. At high velocities, impingement in elbow surfaces by sand particles entrained in the flow prevented protective scales from forming in the elbow. Corrosion rates were high and uniform over the entire surface. Corrosion rates were high and uniform over the entire surface. At intermediate velocities, protective scales formed over all of the elbow surface except at very localized points, where impinging sand particles prevented scale formation. Deep pits formed at these points, and wall penetration rates were extremely high. These conditions are damaging but can be avoided by reducing or increasing flow velocities. A computational model for prediction of sand erosion in piping systems was used to simulate experiments to explain the three observed behaviors and predict conditions defining boundaries between them.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 376289
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 9 Vol. 52; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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