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Research Papers: Materials and Fabrication

Influence of Internal Corrosive Defect on the Burn-Through of In-Service Welding on Pipelines

[+] Author and Article Information
Wu Qian

College of Mechanical and
Electrical Engineering,
China University of Petroleum,
No. 66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: upcwuqian@163.com

Wang Yong

College of Mechanical and
Electrical Engineering,
China University of Petroleum,
No. 66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: wangyong@upc.edu.cn

Han Tao

College of Mechanical and
Electrical Engineering,
China University of Petroleum,
No. 66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: upchantao@163.com

Ding Ling

College of Mechanical and
Electrical Engineering,
China University of Petroleum,
No. 66, Changjiang West Road,
Huangdao District,
Qingdao 266580, China
e-mail: ding_ling0425@163.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 26, 2017; final manuscript received March 20, 2018; published online May 10, 2018. Assoc. Editor: Akira Maekawa.

J. Pressure Vessel Technol 140(4), 041401 (May 10, 2018) (11 pages) Paper No: PVT-17-1194; doi: 10.1115/1.4039843 History: Received September 26, 2017; Revised March 20, 2018

In the course of the service of long-distance oil/gas pipelines, due to corrosion, abrasion, and other reasons, the possibility of pipeline leakage is growing. In-service welding is an advanced technique employed in the repair of pipelines, and it has wide application in guaranteeing the safe transmission of petroleum or gas. The present studies on in-service welding, including experiments and numerical simulations, all assumed that the inner wall of the pipeline was in good condition without considering the influence of defects. This paper started from internal corrosive defects, through the finite element simulation method, investigated how the pressure of inner medium and defect size influence the burn-through of in-service welding. The results show that, compared with the intact pipe, pipeline with internal corrosive defect is more prone to burn-through. With the increase of medium pressure, the maximum radial deformation, the von Mises stress, and hoop stress at the defect area increase. The radial deformation has a certain time effect. The depth of defect has an evident impact on the radial deformation and the stresses. The radial deformation, the von Mises stress, and hoop stress increase with the deepening of the defect, while the impacts of the defect's length and width are less obvious.

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References

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Figures

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Fig. 1

Temperature-dependent material properties: (a) thermal properties and (b) mechanical properties

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Fig. 2

The weld joint of in-service welding: (a) macromorphology and (b) schematic diagram

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Fig. 3

Morphology of the defect

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Fig. 4

Three-dimensional model of pipeline with defect: (a) overall model and (b) local model for weld joint and defect

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Fig. 5

Schematic of double ellipsoid heat source model

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Fig. 6

Comparison of cross section of experimental and simulated molten pool

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Fig. 7

Thermal cycling curves

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Fig. 8

Mechanical constraint schematic

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Fig. 9

Measuring position

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Fig. 10

Temperature fields of the pipeline with and without defect: (a) pipeline with defect and (b) pipeline without defect

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Fig. 11

Welding thermal cycle curves of pipeline with and without defect

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Fig. 12

Stress fields of the pipeline with and without defect: (a) pipeline with defect and (b) pipeline without defect

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Fig. 13

von Mises stress curves

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Fig. 14

Radial deformation of pipeline (5×): (a) pipeline with defect and (b) pipeline without defect

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Fig. 15

Radial deformation curves

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Fig. 16

Radial deformation under different medium pressure

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Fig. 17

The radial deformation and temperature: (a) 1 MPa, (b) 3 MPa, (c) 5 MPa, and (d) 7 MPa

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Fig. 18

Stress curves under different medium pressure: (a) von Mises stress, (b) hoop stress, and (c) axial stress

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Fig. 19

Effect of medium pressure on the maximum stresses

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Fig. 20

The maximum radial deformation of different defect depth

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Fig. 21

Stress curves of different defect depth: (a) von Mises stress (b) hoop stress, and (c) axial stress

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Fig. 22

Effect of defect depth on the maximum stresses

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Fig. 23

The maximum radial deformation of different defect width

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Fig. 24

Stress curves of different defect width: (a) von Mises stress, (b) hoop stress, and (c) axial stress

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Fig. 25

The maximum radial deformation of different defect length

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Fig. 26

Stress curves of different defect length (a) von Mises stress, (b) hoop stress, and (c) axial stress

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