"Trail-out" is defined as the trailing of coarse solids in the water following a slurry batch. The slurry/water interface is a dilute heterogeneous mixing zone, which allows coarser particles to settle. The trail-out solids could cause bottom wear, cross-contamination in a multiple-product pipeline, and plugging due to rising concentration of the ensuing slurry batch. A correlation based on field data was developed to predict the water/slurry mixing zone length. The exponential distribution characteristic of solids concentration was analyzed to estimate the quantity of trailed-out solids for determining the cross-contamination in the multiple-product slurry pipeline system.
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