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Research Papers: Petroleum Transport/Pipelines/Multiphase Flow

Prediction of Solid Particle Erosive Wear of Elbows in Multiphase Annular Flow-Model Development and Experimental Validations

[+] Author and Article Information
Quamrul H. Mazumder

Department of Computer Science, Engineering Science and Physics,  University of Michigan-Flint, Flint, MI 48502qmazumde@umflint.edu

Siamack A. Shirazi, Brenton S. McLaury

 The University of Tulsa, 600 S. College Avenue, Tulsa, OK 74104

J. Energy Resour. Technol 130(2), 023001 (May 02, 2008) (10 pages) doi:10.1115/1.2824284 History: Received March 08, 2006; Revised August 29, 2007; Published May 02, 2008

Erosion damage in the pipe wall due to solid particle impact can cause severe problems in fluid handling industries. Repeated impact of the suspended small solid particles to the inner wall of process equipment and piping removes material from the metal surface. The reduced wall thickness of high pressure equipment and piping can no longer withstand the operating pressure that they were originally designed for and may cause premature failure of the system components. This results in production downtime, safety, and environmental hazards with significant loss to the industry and economy. Prediction of erosion in single-phase flow with sand is a difficult problem due to the effect of different parameters and their interactions that cause erosion. The complexity of the problem increases significantly in multiphase flow where the spatial distribution of the liquid and gas phases and their corresponding velocities change continuously. Most of the currently available erosion prediction models are developed for single-phase flow using empirical data with limited accuracy. A mechanistic model has been developed for predicting erosion in elbows in annular multiphase flow (gas-liquid-solid) considering the effects of particle velocities in gas and liquid phases of the flow. Local fluid phase velocities in multiphase flow are used to calculate erosion rates. The effects of erosion due to impacts of solid particles entrained in the liquid and gas phases are computed separately to determine the total erosion rate. Erosion experiments were conducted to evaluate the model predictions. Comparing the model predicted erosion rates with experimental erosion data showed reasonably good agreement validating the model.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Vertical annular flow with entrained liquid droplets and sand

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Figure 2

Roll wave mechanism of entrainment formation in annular flow (24)

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Figure 3

Comparison of measured entrainment (35) with Ishi (24) model predictions

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Figure 4

Comparison of measured film thicknesses (37,42,44-45) with calculated film thickness (27)

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Figure 5

Comparison of measured film velocity (46) with model predictions

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Figure 6

Comparison of calculated droplet velocity with Dukler experimental measurement (28)

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Figure 7

Schematic of multiphase erosion test loop

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Figure 8

Elbow erosion specimen in test cell

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Figure 9

Comparison of experimental erosion data at Vsl=0.03m∕s with model predictions

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Figure 10

Comparison of experimental erosion data at Vsl=0.30m∕s with model predictions

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Figure 11

Comparison of model predictions with experimental erosion data at Vsg=18.9m∕s

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Figure 12

Comparison of model predictions with experimental erosion data at superficial gas velocity of 34.1m∕s

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Figure 13

Comparison of measured erosion (48) with mechanistic model predictions for multiphase flow

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