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51318-10996-Applicability of the Shields Number for Prediction of Particle Movements in Oil Transmission Pipelines

Picture for Applicability of the Shields Number for Prediction of Particle Movements in Oil Transmission Pipelines
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The current work explores the dimensionless Shields number, including the applicability domain, to predict particle movement in oil transmission pipelines. Multiple scenarios are considered to compare the model’s prediction to actual pipeline experience.

 

Product Number: 51318-10996-SG
Author: Alfonso Garcia / Trevor Place / Fabio Rodriguez Corredor
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
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Corrosive conditions can develop where pipeline sediments accumulate in crude transmission pipelines. The accumulation of sediment at pipeline over bends occurs when inertial forces in the pipe flow cause a thickening in the boundary layer at the pipe floor, which decreases the shear stresses responsible of mobilizing solids. The Shields method has been proposed to predict the accumulation of solid particles taking into account the critical role that shear stress plays in transportation of solids.

The Shields method was originally developed as a river model, a simple dimensionless diagram that can be used to forecast solid particle bed formation in open channels and Newtonian fluid. The model predicts the required minimum viscous shear stress to initiate movement of a particle bed. The dimensionless Shields number provides a ratio of the hydrodynamic drag forces (viscous shear stress) to the net submerged forces of gravity and buoyancy acting on a particle in a loose sediment bed. This meaningful physical number provides useful information about the onset of bed particle movement in pipe flow. The current work explores this dimensionless number, including the applicability domain, to predict particle movement in oil transmission pipelines. Multiple scenarios are considered to compare the model’s prediction to actual pipeline experience.

Corrosive conditions can develop where pipeline sediments accumulate in crude transmission pipelines. The accumulation of sediment at pipeline over bends occurs when inertial forces in the pipe flow cause a thickening in the boundary layer at the pipe floor, which decreases the shear stresses responsible of mobilizing solids. The Shields method has been proposed to predict the accumulation of solid particles taking into account the critical role that shear stress plays in transportation of solids.

The Shields method was originally developed as a river model, a simple dimensionless diagram that can be used to forecast solid particle bed formation in open channels and Newtonian fluid. The model predicts the required minimum viscous shear stress to initiate movement of a particle bed. The dimensionless Shields number provides a ratio of the hydrodynamic drag forces (viscous shear stress) to the net submerged forces of gravity and buoyancy acting on a particle in a loose sediment bed. This meaningful physical number provides useful information about the onset of bed particle movement in pipe flow. The current work explores this dimensionless number, including the applicability domain, to predict particle movement in oil transmission pipelines. Multiple scenarios are considered to compare the model’s prediction to actual pipeline experience.

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