Erosion-corrosion of a carbon steel elbow in CO{sub 2} environment
- Univ. of Tulsa, OK (United States)
It is well known that for many conditions erosion-corrosion can produce much higher wall penetration rates than erosion or corrosion acting alone. While flow velocity generally is believed to be an important factor in erosion-corrosion, more needs to be learned about how flow conditions influence erosion-corrosion. Toward this end, a flow loop was used to study erosion-corrosion of carbon steel elbows in a CO{sub 2} 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 on elbow surfaces by sand particles entrained in the flow prevented protective scales from forming anywhere in the elbow. Corrosion rates for this case 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 the impinging sand particles prevented scale formation. Deep pits formed at these points and wall penetration rates were extremely high. These conditions are very damaging but can be avoided, if recognized in advance, by reducing or increasing the flow velocities. A computational model for predicting sand erosion in piping systems was used to simulate the experiments to explain the three observed behaviors and to predict conditions defining the boundaries between them.
- OSTI ID:
- 106120
- Report Number(s):
- CONF-950304-; TRN: IM9542%%208
- Resource Relation:
- Conference: Corrosion `95: National Association of Corrosion Engineers (NACE) international annual conference and corrosion show, Orlando, FL (United States), 26-31 Mar 1995; Other Information: PBD: 1995; Related Information: Is Part Of Corrosion/95 conference papers; PB: 5788 p.
- Country of Publication:
- United States
- Language:
- English
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