Abstract
An experimental study of the errors associated with wall sampling from a horizontal slurry pipeline has been conducted. Experiments were performed for water-sand slurries flowing in a one inch horizontal pipeline. The effects of particle size (0.08 mm to 0.4 mm), upstream slurry solids concentration (4% to 12%, by volume), upstream bulk velocity (1.8 m/s to 4.0 m/s), sampler diameter (4 mm to 25.4 mm), sampler location, and sampling velocity ratio (defined as the ratio of the sampling velocity to the upstream bulk velocity, 0 to 4.5) on the sample solids concentration and sample particle size distribution were examined. The experimental results show that the observed sample solids concentration and its particle size distribution are functions of the sampler location, sampler diameter and sampling velocity. For the case of sampling from the top or from the side of the pipe, the sampling efficiency (defined as the ratio of the sample solids concentration to the upstream solids concentration) was found to be...
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