Decision Making for Long-Term Pipeline System Repair or Replacement

Haladuick, Shane; Dann, Markus R.

doi:10.1061/ajrua6.0000956

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…28 Currently, the online inspection of pipeline defects can be realized by using a measuring device, such as the smart pig. 29 Such data can comprehensively reflect the defect degradation under various factors, including material wear, load, and temperature, among others. Consequently, pipeline degradation measurement data are used as the basis for evaluating its reliability.…”

Section: Introductionmentioning

confidence: 99%

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Zheng,

Dong,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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Cracks due to corrosion are one of the main reasons for natural-gas pipeline leaks. Making the reliability assessment, prediction, and maintenance decision of pipelines based on measurable crack data is a central issue at present. The failure of pipelines is usually a result of the cumulative impact of multiple cracks. The interaction between adjacent cracks accelerates crack propagation, and greatly affects the degradation mechanism of pipelines. In this study, the reliability prediction and maintenance decisions were studied by considering the dependent degradation between multiple cracks in pipelines. Firstly, the initiation and propagation of pipeline cracks were modeled using a non-homogeneous Poisson process and a Gamma process, respectively. The interaction between cracks was defined to be a function of the random crack distance, which could be reflected by the change of shape parameters in the Gamma process. Secondly, the pipeline’s failure was defined as the competitive failure of the number of cracks, the maximum crack depth, and the total crack depth. The reliability prediction model of a pipeline under this failure mode was determined. A non-periodic combined maintenance policy considering both the pipeline condition and its predictive reliability was then proposed, and an optimal predictive maintenance decision model was constructed to minimize the long-term average cost rate. Finally, the effectiveness of the proposed model and policy was verified by a numerical experiment and a crack dataset of a transnational pipeline.

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Section: Introductionmentioning

confidence: 99%

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Zheng,

Dong,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…In these cases, additional excavation is required to lower the end of the pipeline, which significantly increases the labor costs for repairs. This may require the use of three or more pipelayers, which reduces both technological and economic efficiency of repair work [32,33]. Pipelayers are also transported in a disassembled state, which requires their further assembly before repair work and disassembly after it are completed.…”

Section: Introductionmentioning

confidence: 99%

Improving the Method of Replacing the Defective Sections of Main Oil and Gas Pipelines Using Laser Scanning Data

2022

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During the operation of main pipelines, many defects occur in the body of the pipe and on its surface. The main method for eliminating such defects is cutting out the defective section and welding a new one in its place. The cutting process is complicated by the possible sharp displacement of the ends of the pipeline located on both sides of the cutting site, which is dangerous for the lives of workers and can lead to breakage of the cutting equipment. In addition, to weld a new section, it is necessary to center the ends of the pipeline until they reach the alignment position, for which heavy, difficult-to-transport pipelayers are used, which allow centering the ends of the pipeline only by lifting them. Ensuring the possibility of such centering often requires additional digging of the repaired pipeline. Moreover, due to the large dimensions of pipelayers, payment of permits for their transportation is required. In addition, before transportation, pipelayers require their disassembly and assembly before carrying out repair work, which entails additional time and labor costs. To solve the problems described in this article, a developed design of devices for fixing and centering the ends of the pipeline is proposed, which makes it possible to fix the ends of the pipeline from their sharp displacement, and also to center them before welding a new section. A mathematical model was developed to assess the centering forces, the resulting stresses in the pipeline wall and the reaction forces that arise in the hydraulic cylinders of devices when leaving the ends of the pipeline in their sharp displacement. The initial data for the developed model are the coefficients of the polynomial describing the position of the pipeline in the repair trench. To accurately assess the position of the pipeline, a method of its laser scanning is proposed, the result of which is a point cloud of the pipeline. As part of the study, a method was also developed for the obtaining of a polynomial equation describing the bending of its central axis from a pipeline point cloud. As a result of experimental studies, this method has demonstrated sufficient accuracy in determining the position of the pipeline in the repair trench. Thus, the developed repair method makes it possible to increase both the safety of the repair and the technological and economic efficiency of the process of replacing a defective section.

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“…Steel pipelines are regarded as the most effective, economic and safest way of transporting oil and natural gas over a long distance [1][2][3]. However, these pipelines are subjected to damage and deterioration which are caused by material and construction defects, natural forces, third party damage and corrosion [4][5][6]. A corroded pipeline can be dangerous as it tends to reduce the strength of steel pipelines and eventually its intended service life and so its repair technique is one of the prime interests of researchers worldwide [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, asset integrity management and optimization has become a major concern for oil and gas producers and researchers to save maintenance costs. Owing to that, few researchers have started looking into optimization of composite pipeline repair [6,19,20]. In addition, oil and gas industry have commenced their interest in reducing the usage of composite wrap as it is more expensive than the infill material.…”

Section: Introductionmentioning

confidence: 99%

Modelling failure pressure of pipeline composite repair design using finite element analysis incorporating putty’s contribution

et al. 2019

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A composite repair system which consists of Fibre Reinforced Polymer (FRP) and putty as infill material has been proven effective in repairing pipeline system as it can structurally reinforce the damaged steel pipes and potentially prevent external corrosion. However, previous studies including the design codes are neglecting the contribution of putty as they assume putty is only functioned to fill the corroded section. A recent study has pointed out that putty is not only limited to transfer the load, but it can serve as a load bearing component. Thus, the purpose of this research is to model the contribution of putty in terms of load bearing capacity through finite element analysis (FEA) and mathematical modelling. Two finite elements models were utilized to study the performance of two different material properties of putties used to repair externally corroded pipeline followed by regression analysis. It was found that by incorporating the strength contribution of putty, there are potential to increase the burst pressure by about 5%. The finding of this research is significant as it can serve as a stepping stone towards design optimization of pipeline rehabilitation.

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Decision Making for Long-Term Pipeline System Repair or Replacement

Cited by 10 publications

References 16 publications

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Improving the Method of Replacing the Defective Sections of Main Oil and Gas Pipelines Using Laser Scanning Data

Modelling failure pressure of pipeline composite repair design using finite element analysis incorporating putty’s contribution

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