Safety assessment of buried natural gas pipelines with corrosion defects under the ground settlement

Zheng, Ting; Zheng, Liancun; Zhang, Liang; Tang, Shengjian; Cui, Zhongyin

doi:10.1016/j.engfailanal.2021.105663

Cited by 24 publications

(6 citation statements)

References 24 publications

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“…In these unexpected geologic accidents, pipe deflection, leakage or even burst failure will occur in the piping systems. Zheng et al 19 established a numerical model of buried natural gas pipeline under the coupling of typical ground settlement and local corrosion defects of pipelines. The model was used to evaluate the safety of buried pipelines.…”

Section: Introductionmentioning

confidence: 99%

Study on buried polyethylene pipe reinforced by steel wires under internal pressure and foundation settlement

Shi,

Yu,

Zeng

et al. 2023

Journal of Thermoplastic Composite Materials

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A polyethylene pipe reinforced by winding steel wires (PSP) consists of steel wires and high- density Polyethylene (HDPE). Due to its unique structure and combination of material, the PSP possesses excellent mechanical properties, and it has been widely used in many fields as a buried pipe. Foundation settlement is an evitable loading, and strength failure of buried PSP sometimes occurs due to the foundation settlement. In this paper, numerical investigation of failure behavior of buried PSP was conducted. Firstly, groups of uniaxial tensile tests were carried out to acquire the rate-dependent constitutive equation of the HDPE. Secondly, finite element model of PSP embedded in soil subject to foundation settlement was established. Steel wires are represented by truss elements, and HDPE pipes were modeled with solid elements. The steel wires are built in a spiral structure similar to the real steel-wire mesh of PSP. The effect of the nonlinear material property of components were considered in the model, as the tensile curves were input into the model. The PSP was buried in soil, and foundation settlement was applied on a part of the soil’s top surface as the displacement boundary condition. Due to the great ductility of HDPE, the steel wires broke prior to the HDPE, so the maximum stress of steel wires was used as the failure criterion of PSP. Once the maximum stress of steel wires exceeds the ultimate strength, PSP was considered to have failed. Based on this model, the stress distribution along PSP was investigated with various internal pressure and settlement displacement. The combined influence of the internal pressure and foundation settlement on PSP failure behavior was analyzed, and the location where failure most possibly occurred was determined under different loading conditions. Furthermore, the influence of different structural parameters of PSP and soil was discussed.

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Section: Introductionmentioning

confidence: 99%

Study on buried polyethylene pipe reinforced by steel wires under internal pressure and foundation settlement

Shi,

Yu,

Zeng

et al. 2023

Journal of Thermoplastic Composite Materials

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“…However, there will be some information loss during the compression and transmission of the image data [25], which will make the corresponding pixel grayscale values of the two adjacent images differ greatly, even if they are both normal, resulting in incorrect judgments of the system. To decrease this error, we improve the grayscale discrepancy ∆ of two corresponding pixels to the grayscale discrepancy of the corresponding region ∆, which is the mean of the grayscale discrepancy of all pixels in the designated size region, as shown in Equation (5). where S n denotes number of pixels in designated size region.…”

Section: Defect Image Acquisitionmentioning

confidence: 99%

“…According to international natural gas pipeline accident statistics, natural gas pipeline defects are frequently caused by localized corrosion [3], operator mistakes, defective materials, and construction flaws [4]. As the use of pipelines for transporting hazardous substances becomes more popular worldwide, the possibility of major accidents caused by pipeline failures is gradually increasing [5]. For example, the explosion caused by a gas pipeline leak in a residential building in Slovakia in 2019, which killed at least seven people, reminds us that gas pipelines must be checked regularly [6].…”

Section: Introductionmentioning

confidence: 99%

Identification and Classification of Defects in PE Gas Pipelines Based on VGG16

Wang

Lin

et al. 2022

Applied Sciences

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For the problem of classification and identification of defects in polyethylene (PE) gas pipelines, this paper firstly performs preliminary screening of the acquired images and acquisition efficiency of defective image acquisition was improved. Images of defective PE gas pipelines were pre-processed. Then, edge detection of the defective images was performed using the improved Sobel algorithm and an adaptive threshold segmentation method was applied to segment the defects in the pipeline images. Finally, the defect images were morphologically processed to obtain binary images. The obtained binary images were applied with VGG16 to complete the training of the defect classifier. The experimental findings show that in the TensorFlow API environment, the test set’s highest accuracy reached 97%, which can achieve the identification of defect types of underground PE gas transmission pipelines.

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“…The steel pipes are installed in various environments and have suffered various damage problems [5]. The most prevalent steel pipe defects are: corrosion damage [ [6][7][8][9][10][11][12][13][14][15][16][17][18][19]], cracks [6][7][8]13,17,[20][21][22], durability [8,13,23,24], maintenance costs [8,14,15,25], buckling and burst piping problems [26].…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of biocomposite sandwich pipe under internal pressure – Application for high pressure gas transportation pipelines MEDGAZ

Habbar

Hocine

Maizia

et al. 2023

International Journal of Pressure Vessels and Piping

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Safety assessment of buried natural gas pipelines with corrosion defects under the ground settlement

Cited by 24 publications

References 24 publications

Study on buried polyethylene pipe reinforced by steel wires under internal pressure and foundation settlement

Study on buried polyethylene pipe reinforced by steel wires under internal pressure and foundation settlement

Identification and Classification of Defects in PE Gas Pipelines Based on VGG16

Failure analysis of biocomposite sandwich pipe under internal pressure – Application for high pressure gas transportation pipelines MEDGAZ

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