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Technical Brief

Erosion Mechanism and Sensitivity Parameter Analysis of Natural Gas Curved Pipeline

[+] Author and Article Information
Jie Zhang

School of Mechatronic Engineering,
Southwest Petroleum University,
Chengdu 610500, China;
National Joint Engineering Research Center for
Abrasion Control and Molding of Metal Materials,
Luoyang 471000, China
e-mail: longmenshao@163.com

Hao Yi, Jiadai Du

School of Mechatronic Engineering,
Southwest Petroleum University,
Chengdu 610500, China

Zhuo Huang

School of Mechanical and Electrical Engineering,
University of Electronic Science and Technology of China,
Chengdu 611731, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 3, 2018; final manuscript received February 12, 2019; published online April 4, 2019. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 141(3), 034502 (Apr 04, 2019) (11 pages) Paper No: PVT-18-1268; doi: 10.1115/1.4043011 History: Received December 03, 2018; Revised February 12, 2019

With the deepening of natural gas exploitation, the problem of sand production in gas wells is becoming more and more serious, especially in high-yield gas wells. The solid particles in natural gas are very likely to cause erosion and wear of downstream pipelines and throttling manifolds, which makes the pipeline ineffective. Once the pipeline is damaged, the natural gas leaks, which may cause serious catastrophic accidents. In this paper, the impact of sand particles on the pipeline wall is predicted by the analysis of the research on bent and continuous pipeline combined with particle collision model. The parameters of different particles (particle shape factor, particle velocity, and particle diameter), different bent parameters (angle, diameter, and curvature-to-diameter ratio), and the influence of different continuous pipeline parameters (assembly spacing and angle) are explored on the erosion and wear mechanism of curved pipeline. The results show that the shape of the particles has a great influence on the wear of the curved pipeline. As the shape factor of the particles decreases, the wear tends to decrease. The bent area is subject to erosion changes as the particle parameters and piping parameters. The increase in pipeline diameter is beneficial to reduce the maximum and the average erosion wear rate. When the bent angle of the pipeline is less than 90 deg, the maximum erosion wear rate is basically the same. But when it is greater than 90 deg, it decreases with the increase in the bent angle. When the assembly angle of double curved pipeline is between 0 deg and 60 deg, the elbow is subject to severe erosion wear. At the same time, increasing the assembly spacing is beneficial to reduce the erosion wear rate. The research can provide a theoretical support for subsequent engineering applications.

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Figures

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Fig. 1

Schematic diagram of particle collision with wall surface

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Fig. 2

Schematic diagram of elbow structure and grid

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Fig. 3

Erosion rate contours of verification of grid independence

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Fig. 4

Verification of grid independence

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Fig. 5

Flow field velocity and pressure distribution of a single elbow

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Fig. 6

Variation of maximum erosion rate and average erosion rate with different particle velocities

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Fig. 7

Erosion rate contours of the pipeline with different particle velocity

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Fig. 8

Variation of maximum erosion rate and average erosion rate with particle diameters

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Fig. 9

Erosion rate contours of the pipeline with different particle diameters

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Fig. 10

Variation of maximum erosion rate and average erosion rate with curvature-to-diameter ratios

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Fig. 11

Erosion rate contours of the pipeline with different curvature-to-diameter ratios

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Fig. 12

Variation of maximum erosion rate and average erosion rate with bending angles

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Fig. 13

Erosion rate contours of the pipeline with different bending angles

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Fig. 14

Particle trajectories of the pipeline with different bending angles

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Fig. 15

Variation of maximum erosion rate and average erosion rate with bending diameters

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Fig. 16

Erosion rate contours of the pipeline with different bend diameters

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Fig. 17

Schematic diagram of double elbow bend

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Fig. 18

Variation of maximum erosion rate and average erosion rate with different assembly angles

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Fig. 19

Erosion rate contours of the pipeline with different assembly angle

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Fig. 20

Particle trajectories of pipeline in different assembly angles

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Fig. 21

Variation of maximum erosion rate and average erosion rate with different assembly distances

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Fig. 22

Erosion rate contours of the pipeline with different assembly distances

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