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Temperature and Material Effects on Slurry Wear

Erosion–corrosion is a complex material degradation mechanism involving mechanical erosion and electrochemical corrosion. For components in waste or mineral processing plants, erosion-corrosion wear (wall thinning) is associated with the transport of liquids containing slurry particles. Slurry-induced wear is of significant importance in determining the service life of the major components handling liquids with hard abrasives in waste and chemical handling equipment, exposed parts in marine environments, turbine blades of hydro-electric power plants, mineral processing and mining systems for example. Furthermore, the slurry wear model is able to quantify particle shape, relative hardness and temperature effects on liquid-particle induced wear over a range of particle hardness and temperatures. These insights can assist material selection and plant operations at waste processing facilities. A total degradation loss model caused by flowing liquid-particle slurries was developed to predict component reliability over time. The slurry wear model for piping components calculates the total wear rate from the superposition of the major parameters including erosion, general corrosion, and the synergy between erosion and general corrosion. By classifying each of the major parameters it is possible to predict component total degradation and failure life time using distributions of parameters and statistical methods. Probabilistic calculations were performed to quantify the combined effect of particle shape, relative hardness and temperature on liquid-particle induced erosion-corrosion. Average wear rates over 40 years were calculated for stainless steel and nickel alloy materials exposed to different particle hardness and particle shapes, and temperatures. The probabilities of exceeding a predefined wear allowance indicate that harder target materials are not necessarily more wear resistant. Material selection should consider both corrosive and mechanical stressors to minimize total wear associated with erosion-corrosion. Erosion-corrosion probabilistic calculations will support the safe, efficient, and reliable operation of processing components over the design life. For more information please contact Consuelo Guzman-Leong at cguzman-leong@lpiny.com or 509-420-7684

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