Artykuły w czasopismach na temat „Analysis pipeline”
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1
Wang, Li Li, Xiao Qing Zhang i Liang Liang Xu. "Seismic Performance Analysis of Oil Pipeline with Crack Defects". Advanced Materials Research 721 (lipiec 2013): 710–13. http://dx.doi.org/10.4028/www.scientific.net/amr.721.710.
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The pipelines distribute extensively in China, but pipelines cracks caused pipeline damaged frequently. Once the pipeline’s cracks are considered in the seismic condition, the performance of pipelines will face many problems. The finite element method was used to analyze the seismic responses of pipeline’s cracks. According to fracture mechanics [1], the time-history responses of displacement, acceleration and stress of pipeline with crack defects and seamless pipeline were obtained, and the results were also compared and analyzed. The results indicate that cracks will cause the stress concentration of the pipeline, the pipeline cracks should be considered in seismic responses of pipelines to make the pipelines in safety and economy, and more attention should be paid to the design and study of pipelines with crack defects.
2
Lu, Qun, Hui Xia Li i Jian Bo Yuan. "3D FEM Analysis of Effects on Adjacent Pipelines by Pit Excavation". Applied Mechanics and Materials 90-93 (wrzesień 2011): 165–71. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.165.
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Pit excavation influences the stress and deformation of adjacent underground pipelines seriously. On the base of former study, the project was analyzed with the aid of general finite element soft ABAQUS, in which the interactive action of soil with pipeline and pit protection structure were taken into account. Wall-soil friction and pipeline-soil friction contact were used. The influence on adjacent pipelines of pit excavation was analyzed. The laws of deformation and the stress were gained. The results showed that the horizontal displacement was much bigger than the vertical displacement, and the pipeline would lift at the end close to the symmetric plane and fall at the other end. The displacement would decrease with the increment of the distance between pit and pipelines. The laws of influence of the pipeline’s embedment and wall-soil friction were similar, while the latter’s influence was greater than the former’s. The influence on horizontal displacement aroused by wall-soil friction was greater. The principle tensile stress mainly aroused by the pipeline’s horizontal displacement would cause tension fracture. The sections of the pipeline around the area of the end and the middle of the pit were dangerous, which should be particularly protected.
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Shao, Bing, Xiang Zhen Yan i Xiu Juan Yang. "Reliability Analysis of Locally Thinned Submarine Pipelines in ChengDao Oil Field". Applied Mechanics and Materials 94-96 (wrzesień 2011): 1527–30. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1527.
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Local thinning of submarine pipeline always exists due to the complexity and dynamic of marine environment loads. However, the location and extent of thinning areas are random. Mechanical research on the randomness of local thinning of submarine pipelines is significant for pipeline’s stress analysis and failure evaluation. In this paper, finite element model of locally thinned submarine pipeline is established and based on the Monte-Carlo method, the effect of input random variables on the submarine pipeline’s reliability is analyzed. Probability distribution ranges of equivalent stresses are got and further, relationship equation between confidence level and stress limit has been obtained. The result more accurately reveals the relationships of locally thinned pipeline and its elastic modulus with equivalent stress, which can provide foundation for safety analysis of locally thinned submarine pipeline with internal pressure.
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Zhang, Peng, Wei Liu, Siming Liu, Tian Xu, Yimiao Li i Yunfei Huang. "Safety Analysis and Condition Assessment of Corroded Energy Pipelines under Landslide Disasters". Applied Sciences 13, nr 23 (30.11.2023): 12880. http://dx.doi.org/10.3390/app132312880.
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Corrosion poses a significant risk to the safety of energy pipelines, while landslide disasters emerge as the primary threat responsible for triggering pipeline failures across mountainous areas. To date, there is limited research focused on the safety of energy pipelines considering the synergistic effect of corrosion and landslides. The present study proposes a finite element (FE)-based model to assess the condition of corroded pipelines under landslides. The effects of corrosion dimensions (length and depth) and location are determined. A novel equation is finally developed to predict the maximum stress and determine the most disadvantageous position for corroded pipelines under various landslide displacements. The results demonstrate that (1) as the landslide progresses, the pipeline’s stress significantly increases; (2) corrosion depth has a more significant impact on the pipeline condition than the corrosion length, and it is positively correlated with the pipe’s stress; (3) the maximum stress exhibits a nonlinear relationship with the landslide-facing position and the corrosion circumferential location; and (4) when the axial position of the corrosion is more than 6.5 m away from the center of the landslide, the location of maximum stress shifts from the corrosion region to the central section of the pipeline within the landslide. This work contributes to helping pipeline owners to understand the applicability of energy pipelines subjected to the combined effects of corrosion and landslides and provides support for future risk assessment efforts in pipeline integrity management.
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Ren, Zhi Ping, Chang Hua Liu i Feng Feng Bie. "Dynamic Analysis of Suspended River Crossing Pipeline". Applied Mechanics and Materials 638-640 (wrzesień 2014): 51–57. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.51.
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When the long-distance oil pipeline under rivers (referred to as river-crossing pipelines) are damaged by the third-party, they are prone to nudity or left vacant, and the oil pipelines under the action of water flow will cause pipeline failure; and the distance of suspended pipeline is longer than the allowed length will cause the pipeline resonance. In order to avoid pipelines fatigue or broken, suspended pipelines are considered as part of the arc shape, and non-suspended pipelines are considered as the linear shape of the mechanical model with the two ends of the fixed pier synchronous. The study will consider the impact of water flow, buoyancy, the gravity of pipelines and its annexes, bending deformation and bending moment, do the tense calculation for suspended pipelines with external load and the vibration analysis for suspended pipelines under different water flow speeds. The results showed that: the design of river-crossing suspended pipelines not only needs to consider the impact of water flow, buoyancy, the gravity of pipelines and its annexes, bending deformation and bending moment, but also to consider the floating vortex-induced vibration of the suspended pipeline, which should cause pipeline designers, constructors and maintainers’ attention.
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Liu, Jieying, Lingxiao Li, Tianjiao Hou, Xinguo Wu i Qiao Zhou. "Study on Security Angle of Gas Pipeline Elbow Based on Stress Analysis Method". Open Civil Engineering Journal 10, nr 1 (31.03.2016): 133–40. http://dx.doi.org/10.2174/1874149501610010133.
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The gas pipelines usually undergo complicated and changeable regional environment. As the level of the potential difference or pipeline’s route changes in the space and therefore elastic bending cannot meet the needs when pipe changes its direction, we generally use pipe bend to connect two pipelines with different spatial extend direction during the pipe laying period, and it can reduce the temperature stress. Unreasonable design of elbow will lead to pipeline damage. We established mountain area pipeline model, and conducted analysis on pipeline stress under different elbow angles. Research shows that different angles of the bends suffer different operation stress, and we have come to the conclusion that the angle of pipe bends should not be within the range of 15 degrees to 35 degrees.
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Cong, Shen, Ke Tong, Dong Feng Li, Zhi Xin Chen i Ke Cai. "Leakage Failure Analysis of the ERW Steel Pipeline". Materials Science Forum 993 (maj 2020): 1224–29. http://dx.doi.org/10.4028/www.scientific.net/msf.993.1224.
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This paper provides a thorough investigation on the leakage reason of the ERW steel pipeline in an oil field. Through appearance inspection, physicochemical inspection, metallographic inspection and scanning electron microscope (SEM), it was found that the main reason of corrosions was caused by residual liquid at the bottom of the pipeline and O2 and CO2 in the air pressure test. The corrosion medium was large volume of O2 and CO2 forming continuously saturated corrosive aqueous solution in small volume of residual liquid, and the corrosion type was the under-deposit corrosion. It is recommended to conduct hot air purging on the pipelined before pressure test for building pipelines in the future, and if the pipeline is not put into use in time, it is recommended to use nitrogen to maintain pressure.
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Grafberger, Stefan, Paul Groth i Sebastian Schelter. "Automating and Optimizing Data-Centric What-If Analyses on Native Machine Learning Pipelines". Proceedings of the ACM on Management of Data 1, nr 2 (13.06.2023): 1–26. http://dx.doi.org/10.1145/3589273.
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Software systems that learn from data with machine learning (ML) are used in critical decision-making processes. Unfortunately, real-world experience shows that the pipelines for data preparation, feature encoding and model training in ML systems are often brittle with respect to their input data. As a consequence, data scientists have to run different kinds of data centric what-if analyses to evaluate the robustness and reliability of such pipelines, e.g., with respect to data errors or preprocessing techniques. These what-if analyses follow a common pattern: they take an existing ML pipeline, create a pipeline variant by introducing a small change, and execute this pipeline variant to see how the change impacts the pipeline's output score. The application of existing analysis techniques to ML pipelines is technically challenging as they are hard to integrate into existing pipeline code and their execution introduces large overheads due to repeated work. We propose mlwhatif to address these integration and efficiency challenges for data-centric what-if analyses on ML pipelines. mlwhatif enables data scientists to declaratively specify what-if analyses for an ML pipeline, and to automatically generate, optimize and execute the required pipeline variants. Our approach employs pipeline patches to specify changes to the data, operators and models of a pipeline. Based on these patches, we define a multi-query optimizer for efficiently executing the resulting pipeline variants jointly, with four subsumption-based optimization rules. Subsequently, we detail how to implement the pipeline variant generation and optimizer of mlwhatif. For that, we instrument native ML pipelines written in Python to extract dataflow plans with re-executable operators. We experimentally evaluate mlwhatif, and find that its speedup scales linearly with the number of pipeline variants in applicable cases, and is invariant to the input data size. In end-to-end experiments with four analyses on more than 60 pipelines, we show speedups of up to 13x compared to sequential execution, and find that the speedup is invariant to the model and featurization in the pipeline. Furthermore, we confirm the low instrumentation overhead of mlwhatif.
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Ismail, Mohd Fadly Hisham, Zazilah May, Vijanth Sagayan Asirvadam i Nazrul Anuar Nayan. "Machine-Learning-Based Classification for Pipeline Corrosion with Monte Carlo Probabilistic Analysis". Energies 16, nr 8 (21.04.2023): 3589. http://dx.doi.org/10.3390/en16083589.
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Pipeline corrosion is one of the leading causes of failures in the transmission of gas and hazardous liquids in the oil and gas industry. In-line inspection is a non-destructive inspection for detecting corrosion defects in pipelines. Defects are measured in terms of their width, length and depth. Consecutive in-line inspection data are used to determine the pipeline’s corrosion growth rate and its remnant life, which set the operational and maintenance activities of the pipeline. The traditional approach of manually processing in-line inspection data has various weaknesses, including being time consuming due to huge data volume and complexity, prone to error, subject to biased judgement by experts and challenging for matching of in-line inspection datasets. This paper aimed to contribute to the adoption of machine learning approaches in classifying pipeline defects as per Pipeline Operator Forum requirements and matching in-line inspection data for determining the corrosion growth rate and remnant life of pipelines. Machine learning techniques, namely, decision tree, random forest, support vector machines and logistic regression, were applied in the classification of pipeline defects using Phyton programming. The performance of each technique in terms of the accuracy of results was compared. The results showed that the decision tree classifier model was the most accurate (99.9%) compared with the other classifiers.
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Ye, Jihong, Yiyang Fang i Xinxiang Yang. "Vulnerability Analysis of Harbor Oil Pipeline Affected by Typhoon". Energies 15, nr 18 (15.09.2022): 6752. http://dx.doi.org/10.3390/en15186752.
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The integrity of oil pipelines has received considerable attention. Pipeline leakage accidents cause environmental pollution and casualties. Analysis of accident data in recent years shows that the harbor oil pipeline is prone to natural disasters such as typhoons. The vulnerability analysis of the pipeline was conducted from three perspectives: typhoon grades, windward angles, and operating conditions. The analytic hierarchy is used to build the vulnerability evaluation index system. The vulnerability evaluation score of the pipeline can be calculated by the semi-quantitative method. The results show that the probability of pipeline vulnerability failure increases with the increase of typhoon level, while the change of wind angle has no obvious effect on the pipeline. The full load of the pipeline has a higher evaluation score than that of the empty load, which means the full load is safer. The vulnerability analysis of oil pipelines can effectively improve the safety of pipeline transportation under the influence of typhoons.
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Lee, Heeyeon, i Sanghun Lee. "Economic Analysis on Hydrogen Pipeline Infrastructure Establishment Scenarios: Case Study of South Korea". Energies 15, nr 18 (18.09.2022): 6824. http://dx.doi.org/10.3390/en15186824.
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South Korea has a plan to realize a hydrogen economy, and it is essential to establish a main hydrogen pipeline for hydrogen transport. This study develops a cost estimation model applicable to the construction of hydrogen pipelines and conducts an economic analysis to evaluate various scenarios for hydrogen pipeline construction. As a result, the cost of modifying an existing natural gas to a hydrogen pipeline is the lowest, however, there are issues with the safety of the modified hydrogen pipes from natural gas and the necessity of the existing natural gas pipelines. In the case of a short-distance hydrogen pipeline, the cost is about 1.8 times that of the existing natural gas pipeline modification, but it is considered a transitional scenario before the construction of the main hydrogen pipeline nationwide. Lastly, in the case of long-distance main hydrogen pipeline construction, it takes about 3.7 times as much cost as natural gas pipeline modification, however it has the advantage of being the ultimate hydrogen pipeline network. In this study, various hydrogen pipeline establishment scenarios ware compared. These results are expected to be utilized to establish plans for building hydrogen pipelines and to evaluate their economic feasibility.
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Quan, Lingxiao, Bingjiang Sun, Jinsong Zhao i Dong Li. "Frequency Response Analysis of Fluid-Structure Interaction Vibration in Aircraft Bending Hydraulic Pipe". Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 36, nr 3 (czerwiec 2018): 487–95. http://dx.doi.org/10.1051/jnwpu/20183630487.
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For the aviation bending pipe, the fluid-structure interaction 14-equation model is established, and the Laplace transform is used to solve the problem in the frequency domain. For the pipeline with a single elbow, the influence of bending parameters on the frequency response of the pipeline in the frequency domain is analyzed by using the 14-equation. At the same time, for pipelines containing two elbows, we analyze the influence of bending parameters on the natural frequency of the pipeline in different spans. In the end, the accuracy of the simulation is verified by the modal knocking test. Through the above analysis, we reach the following conclusion:the bending angle of the pipeline is greatly influenced by inherent characteristics, the smaller the bending angle, the higher the pipeline’s inherent frequency domain. However, the effect of bending radius will cause the change in length. Usually, the increase of bending radius leads to pipe length increasing, resulting in its inherent frequency decreasing.
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Li, Xia, Huang Kun, Hong Fang Lu i Wen Ting Yang. "Stress Analysis of Suspended Gas Pipeline". Applied Mechanics and Materials 448-453 (październik 2013): 1359–62. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1359.
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Under the effect of geologic hazard, soil horizon under gas pipeline tends to subside or runoff, which may result in pipeline hanging in the air with uneven distribution of stress and consequently lead to pipe failure. In view of pipeline suspension resulted from geologic hazard and taking pipeline XX as example, software CAESAR II is used to analyze the stress of suspended pipelines with different length combined with practical and existing analysis calculation model. The critical length of suspended pipeline is obtained on the basis of the software analysis. The results with certain engineering value can provide reliable theoretical basis for practical engineering.
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Liang, Xiaoqiang, Da Hu, Lei Jiang, Yongsuo Li i Xian Yang. "Thermal Stress Analysis and Spatial Data Matching of Urban Underground Pipelines". International Journal of Heat and Technology 39, nr 2 (30.04.2021): 477–85. http://dx.doi.org/10.18280/ijht.390217.
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The mining of thermal data of underground pipelines is very important for the construction of urban underground pipeline network data matching model and the proposal of large-scale pipeline spatial data matching mechanism. The existing temperature field calculation and stress field simulation methods for thermal pipelines are quite mature already, but they generally pay less attention to the overall connection features of the underground pipeline network and the local details of network nodes, and the deep-level sharing and utilization of the thermal stress data of pipelines is insufficient during the process of spatial data matching of the pipeline network. To this end, this paper conducted a research on thermal stress analysis and spatial data matching of urban underground pipelines. First, the paper gave a theoretical analysis on the temperature field and stress field of underground pipelines and obtained the simulation calculation results; then it elaborated on the calculation of the similarity of underground pipeline network information, proposed a method for spatial data matching, and gave the corresponding algorithm flow; at last, experimental results verified the reliability of the simulation calculation results of the thermal stress of underground pipelines and the effectiveness of the proposed spatial data matching method.
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Gong, Leiyu, Shengli Zhou, Cheli Ren i Weikai Zhao. "Simulation Analysis of Pipeline Detection Robot Motion State". Advances in Engineering Technology Research 8, nr 1 (27.09.2023): 121. http://dx.doi.org/10.56028/aetr.8.1.121.2023.
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Pipeline transportation has the advantages of safety, reliability and low energy consumption in transporting natural gas, and is an important transportation route for transporting natural gas. Due to the characteristics of natural gas pipelines with large internal pressure fluctuations, plenty of pipeline bending sections and complex pipeline deformation characteristics, pipeline detection robots are required to have higher detection capabilities, and the study of the motion state of natural gas pipeline detection robots in pipeline detection is of practical significance. This paper adopts the CFD numerical simulation method and establishes the model of DN800 pipeline deformation detection robot. Next, by simulating the natural gas pipeline detection robot under different media and different pipeline types respectively, the motion state of the detection robot is analyzed under different conditions. The simulation results verify the reliability of the detection robot working inside the pipeline, which can fully guarantee the safe transportation of natural gas pipeline.
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Karamitros, Dimitris K., Christos Zoupantis i George D. Bouckovalas. "Buried pipelines with bends: analytical verification against permanent ground displacements". Canadian Geotechnical Journal 53, nr 11 (listopad 2016): 1782–93. http://dx.doi.org/10.1139/cgj-2016-0060.
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Available analytical methodologies for the stress analysis of buried pipelines against large permanent ground displacements (PGDs) apply only to straight pipeline segments. Hence, a new methodology is proposed herein for the analytical computation of pipeline strains in bends of arbitrary angle and radius of curvature, located outside the PGD high-curvature zone, but within the pipeline’s unanchored length. The methodology is based on the equivalent-linear analysis of the bend, assuming that it will perform as an elastic arched beam subjected to uniformly distributed ultimate axial and transverse horizontal soil reactions. The end of the bend towards the PGD zone is subjected to an axial displacement, calculated on the basis of overall displacement compatibility along the pipeline, while the other end is restrained by the unanchored pipeline segment beyond the bend. Using this approach, the maximum axial force at the vicinity of the PGD zone can also be calculated and consequently used for the estimation of corresponding pipeline strains with any of the available numerical or analytical methodologies for straight pipeline segments. Parametric nonlinear finite element analyses are performed to verify the analytical methodology and also derive conclusions of practical interest regarding the effect of bends on pipeline design.
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Katebi, Mohammad, Pooneh Maghoul i James Blatz. "Numerical analysis of pipeline response to slow landslides: case study". Canadian Geotechnical Journal 56, nr 12 (grudzień 2019): 1779–88. http://dx.doi.org/10.1139/cgj-2018-0457.
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A numerical analysis is carried out to study the behaviour of pipelines subjected to slow landslides at three at-risk landslide zones of Manitoba Pipeline Network. The pipeline’s longitudinal axis is parallel to the slow landslides at all three research sites. The ground displacements monitored for 5 years are imposed on the pipe using a special purpose pipe–soil interaction element (PSI element) using ABAQUS/Standard. The stiffness of PSI elements is defined based on soil–pipe interface properties according to a 2017 technical report from Pipeline Research Council International Inc. The results of the numerical analysis are compared with the instrumentation data to draw recommendations for future monitoring programs in slow landslide zones.
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Seth, Debtanu, Bappaditya Manna, Jagdish Telangrao Shahu, Tiago Fazeres-Ferradosa, Francisco Taveira Pinto i Paulo Jorge Rosa-Santos. "Buckling Mechanism of Offshore Pipelines: A State of the Art". Journal of Marine Science and Engineering 9, nr 10 (1.10.2021): 1074. http://dx.doi.org/10.3390/jmse9101074.
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The buckling analysis of an offshore pipeline refers to the analysis of temperature-induced uplift and lateral buckling of pipelines by analytical, numerical, and experimental means. Thus, the current study discusses different research performed on thermal pipe-buckling and the different factors affecting the pipeline’s buckling behaviour. The current study consists of the dependency of the pipe-buckling direction on the seabed features and burial condition; the pre-buckling and post-buckling load-displacement behaviour of the pipeline; the effect of soil weight, burial depth, axial resistance, imperfection amplitude, temperature difference, interface tensile capacity, and diameter-to-thickness ratio on the uplift and lateral resistance; and the failure mechanism of the pipeline. Moreover, the effect of external hydrostatic pressure, bending moment, initial imperfection, sectional rigidity, and diameter-to-thickness ratio of the pipeline on collapse load of the pipeline during buckling were also included in the study. This work highlights the existing knowledge on the topic along with the main findings performed up to recent research. In addition, the reference literature on the topic is given and analysed to contribute to a broad perspective on buckling analysis of offshore pipelines. This work provides a starting point to identify further innovation and development guidelines for professionals and researchers dealing with offshore pipelines, which are key infrastructures for numerous maritime applications.
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Chen, Liqiong, Shijuan Wu, Hongfang Lu, Kun Huang, Yitang Lv i Jiali Wu. "Stress Analysis of Buried Gas Pipeline Traversing Sliding Mass". Open Civil Engineering Journal 8, nr 1 (29.09.2014): 257–61. http://dx.doi.org/10.2174/1874149501408010257.
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Landslides are one of the primary dangers associated with gas pipelines. Pipeline spans can be divided into two categories: longitudinally traversing and laterally traversing. The load brought on by a landslide can cause pipeline failure, thus stress analysis of both ways of traversing is of great necessity. Through stress analysis, the junction of the conventional buried pipeline and the landslide has been confirmed as coming under the heaviest loads. Therefore, stress checks against accidental loads should be emphasized during the stress analysis of gas pipelines traversing sliding masses.
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Zapukhliak, V. B., Yu H. Melnychenko, V. Ya Hrudz, L. Ya Poberezhnyi i Ya V. Doroshenko. "Analysis of the stress-deformed state of pipelines during plunging". Oil and Gas Power Engineering, nr 2(34) (29.12.2020): 56–66. http://dx.doi.org/10.31471/1993-9868-2020-2(34)-56-66.
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Recently, there has been a need to carry out work on deepening the pipeline (plunging) in some areas, where the depth of pipeline location was found to be inconsistent with the relevant standards. That is, pipelines during operation can be partially opened as a result of soil erosion, and they also tend to lose stability as a result of various factors (pressure, temperature, soil water content, etc.) and rise up (float). Also, the facts of laying pipelines in the process of their construction not to the design marks are known, due to the "low" construction conduct, that is, when the pipeline in some sections was in a trench, the depth of which did not correspond to the project. Further operation of such pipelines may be under the threat of the pipeline coming to the surface and mechanical damage to the insulation and the pipe body. Therefore, to ensure reliable operation of the pipeline, which has got raised sections, it is necessary to lower these sections to the design marks. To do this, it is necessary to develop equipmentand technology for repair work of this type. Therefore, the article considers two options for post-trenchingpipelines: lowering under its own weight without supporting and lowering with the maintenance of the pipeline by a supporting machine. For both methods of plunging, the stress-strain state of the pipeline was simulated during its lowering to the design level on the created mathematical model. An algorithm for calculating the geometric parameters of work performance, determining the stress state and checking the strength of the pipeline has been proposed.
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Zhvan, V., V. Donenko, S. Kulish i A. Taran. "ANALYSIS OF EXTERNAL ENGINEERING NETWORK METHODS". Municipal economy of cities 4, nr 157 (25.09.2020): 7–11. http://dx.doi.org/10.33042/2522-1809-2020-4-157-7-11.
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The article is devoted to the effective analysis of trench and trenchless pipeline laying technologies. In the course of the work, an analytical review of pipeline assembly was performed, the main technological parameters, the scope of each method, and their advantages and disadvantages were determined. List of considered pipeline laying methods: trenching, horizontal directional drilling, mechanical puncture, hydraulic puncture, microtunneling and punching. The article analyzes the classical trench method and the most widely used trenchless ones: horizontal directional drilling; mechanical puncture; hydraulic puncture; microtunneling; punching. Each of these methods has several advantages and disadvantages. The choice of the optimal method of laying the pipeline depends on many factors: the physical and mechanical properties of soils and hydrogeological conditions, the length and diameter of the pipeline, the presence of other communications, buildings and structures, as well as the budget that customers have. Work time is the last deciding factor. Based on the results of the analysis of pipeline laying technologies and expert survey of construction industry experts, the cost table of each method was compiled, outlining the main characteristics of the technology: length of pipeline, speed of work, scope, cost, and the advantages and disadvantages of each of the considered methods. The conclusions about the use of each of the pipeline laying methods were made. Each of the methods has its advantages and disadvantages, so to choose the method of work it is necessary to conduct a comprehensive assessment of technological parameters, cost, scope and timing of work. The cost of lay-ing the pipeline consists of the following factors: conducting research; selection of diameter and determination of pipeline length; choice of laying method and equipment necessary for the works; selection of equipment, shut-off and control equipment and other materials arranged on the pipeline; terms of performance of works. Taking into account these factors, an estimate is made, which determines the cost of installation of a particular pipeline. After the analysis, we can conclude that among the methods of trenchless laying of pipelines can be identi-fied horizontally directional drilling, it is this method of laying the pipeline will be appropriate to use for our region. The drilling technique allows to carry out pipelines under obstacles, to pull long segments of networks, to repair site damage. This method is universal and can be used in almost any environment. Keywords: trenches, horizontal directional drilling, mechanical puncture, hydraulic piercing, microtunnelling, punching, pipeline.
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Feng, Chunjian, Hang Wu i Xin Li. "Buckling Analysis of Corroded Pipelines under Combined Axial Force and External Pressure". Metals 12, nr 2 (10.02.2022): 308. http://dx.doi.org/10.3390/met12020308.
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Affected by a complex environment, corrosion is a common defect in steel pipelines. Moreover, steel pipelines are subjected to large axial forces during their installation and operation. Corroded deep-sea steel pipelines are prone to local buckling under complex loads. Therefore, in view of this problem, the collapse response of corroded steel pipelines under the combined axial force and external pressure is analyzed in detail. First, a formula for evaluating the collapse pressure of corroded steel pipelines under external pressure and axial force is proposed. Then, the factors affecting the collapse pressure of the steel pipeline are parameterized by using the finite element method. The accuracy of the finite element model is proved by collapse tests of the corroded steel pipeline. As shown in finite element results, the diameter-to-thickness ratio, initial ovality and corrosion defect size have significant effects on the buckling response of a steel pipeline. The collapse pressure of the steel pipeline decreases as the axial force increases. Finally, based on the finite element simulation results, the parameter variables in the evaluation formula are obtained.
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Rusin, Andrzej, Katarzyna Stolecka-Antczak, Krzysztof Kapusta, Krzysztof Rogoziński i Krzysztof Rusin. "Analysis of the Effects of Failure of a Gas Pipeline Caused by a Mechanical Damage". Energies 14, nr 22 (17.11.2021): 7686. http://dx.doi.org/10.3390/en14227686.
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Natural gas continues to be one of the basic energy sources used as fuel in the power sector, in industries and in households. The potential and attractiveness of this fuel is gaining special significance in the current energy transitions from coal-based power engineering to power generation based on renewable energy sources. Natural gas is supplied to consumers mainly through a network of pipelines, which ensures a relatively high reliability of the supply. Still, failures occur due to the corrosion of pipeline walls, material defects or human errors, which can result in uncontrolled release of gas. The released gas can trigger dangerous phenomena, such as fires and explosions. This paper presents an analysis of the causes and effects of damage to a medium-pressure pipeline caused by earthworks carried out within an area where a pipeline is located. Holes in the pipeline due to the impact of an excavator bucket are analysed. The impact of the excavator bucket may cause a rupture equal to 50% of the pipeline’s cross-sectional area. Hazard zones related to fires and explosions due to the released natural gas are presented. For the analysed pipeline with a diameter of 0.5 m and a gas pressure of 5 MPa, the range of hazard zones arising due to pipeline damage caused by an excavator bucket can reach about 200 m.
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Li, Yan, Huijun Jin, Zhi Wen, Xinze Li i Qi Zhang. "Stability of the Foundation of Buried Energy Pipeline in Permafrost Region". Geofluids 2021 (16.12.2021): 1–18. http://dx.doi.org/10.1155/2021/3066553.
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During operation, a buried pipeline is threatened by a variety of geological hazards, particularly in permafrost regions, where freezing-thawing disasters have a significant influence on the integrity and safety of the buried pipelines. The topographical environmental conditions along the pipeline, as well as the influence of frost heave and thaw settlement on the pipeline’s foundation soil, must be considered in the design and construction stage. Theoretical analysis, numerical modeling, field testing, and mitigation measures on vital energy pipelines in permafrost have been widely documented, but no attempt has been made to review the freezing-thawing disasters, current research methodologies, and mitigation strategies. This article reviews the formation mechanisms and mitigation measures for frost hazards (e.g., differential frost heave, thaw settlement, slope instability, frost mounds, icing, river ice scouring, and pipeline floating) along buried pipelines in permafrost regions and summarizes and prospects the major progress in the research on mechanisms, analysis methods, model test, and field monitoring based on publications of studies of key energy pipelines in permafrost regions. This review will provide scholars with a basic understanding of the challenging freezing-thawing hazards encountered by energy pipelines in permafrost regions, as well as research on the stability and mitigation of pipeline foundation soils plagued by freezing-thawing hazards in permafrost regions under a warming climate and degrading permafrost environment.
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Prasad, J., M. Vasim Babu, M. Kasiselvanathan i K. B. Gurumoorthy. "Pipelined and Wave Pipelined Approach Based Comparative Analysis for 16x16 Vedic Multiplier". Indian Journal Of Science And Technology 17, nr 14 (3.04.2024): 1381–90. http://dx.doi.org/10.17485/ijst/v17i14.3033.
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Objectives: This work objective is to construct an FPGA-based 16x16 Vedic multiplier and assess the performance of the multiplier using three distinct architectures: pipeline, wave pipeline, and modified wave pipeline in terms of delay and clock skew. Methods: The 16 × 16 Vedic multiplier was constructed and designed through four numbers of an 8x8 Vedic multiplier. For the 16x16 Vedic multiplier, the 3-stage pipeline and wave pipeline techniques are applied, and the delay performances of the Vedic multiplier are compared. Delay optimization: In the wave pipeline Vedic multiplier architecture, the delay is decreased by inserting the known delay on the longest path delay between the multiplier and adder. Clock skew optimization: The clock skew issue of the wave pipeline Vedic multiplier architecture is minimized by adjusting the setup time violation of the clock signal that is connected to the input and output registers. Findings: The delay performance of the Vedic multiplier was evaluated by the synthesis tools Xilinx 12.1, Xilinx ISE 14.2, and Altera, and based on the synthesis report, the Xilinx synthesis tool offers 73.71% delay performance for the pipeline approach and 53.39% for the wave pipeline approach compared to the Altera tool. Further delay is reduced by the proposed modified wave pipeline approach, which saves 2.122 ns of delay compared to the wave pipeline architecture. The clock skew performance was analyzed using the Time Quest timing analyzer tool, and it was minimized to 0.035 from 0.048 compared to the wave pipeline approach. Novelty: In this work, the modified wave pipeline approach has been applied to the existing Vedic multiplier architecture, and it offers less delay as well as less clock skew compared to the existing method. Hence, the performance of the Vedic multiplier with a modified wave pipelined approach was evaluated through a 3-tap FIR filter by applying a vibroarthrography signal. Keywords: Pipeline, Wave Pipeline, Vedic Multiplier, Clock skew, Set up violation, Altera quartex- II Time quest timing analyzer tool
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Black, P. S., L. C. Daniels, N. C. Hoyle i W. P. Jepson. "Studying Transient Multi-Phase Flow Using the Pipeline Analysis Code (PLAC)". Journal of Energy Resources Technology 112, nr 1 (1.03.1990): 25–29. http://dx.doi.org/10.1115/1.2905708.
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The Pipeline Analysis Code, PLAC, is utilized to study the flow generated from a shallow dip in a long pipeline. It shows that much longer and infrequent slugs are formed when liquid is swept out of the dip than would be expected from horizontal pipeline data. These slugs eventually propagate along the entire length of the pipeline. These dip-induced slugs are similar to the one-in-a-thousand slugs reported from existing long pipelines.
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Zhang, Zhi Xia, i Di Wu. "Reliability Analysis of Factors Affecting Gas Pipeline Operational Condition". Applied Mechanics and Materials 135-136 (październik 2011): 720–24. http://dx.doi.org/10.4028/www.scientific.net/amm.135-136.720.
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The safety of the pipeline in use is tightly linked with the resident life and belongings. Reliable structural integrity and safety of gas pipelines under various service pressure events including defects should be warily evaluated. The reliability evaluation of gas pipelines is necessary to prevent risk. In this paper, Markov chain Monte Carlo is proposed to analyze the reliability of factors affecting gas pipeline operational condition in consideration of the character of historical data, the calculating processes of reliability prediction are provided in view of performance degradation characteristics of the factors.This paper takes corrosion as important factor affecting pipeline operation for example, calculates the reliability indexes of gas pipeline, studies the relation of failure rate and length/depth of corrosion pit ,operation time,etc. seeks weak links of system, and brings forward concrete and reliable measures to improve system reliability.
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Lin, Xin, i Guojian Shao. "Application of HMC-SS Method in Pipeline Reliability Analysis and Residual Life Assessment". Mathematical Problems in Engineering 2021 (5.11.2021): 1–10. http://dx.doi.org/10.1155/2021/3756441.
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In this paper, the reliability analysis and residual life assessment model of gas pipelines with multiple corrosion pits are established. Aiming at the simulation evaluation of small failure probability of gas pipelines, a new method for reliability analysis and residual life assessment of gas pipelines with multiple internal corrosion pits is proposed, which is called the Hamiltonian Monte Carlo subset simulation (HMC-SS) method. Compared with the traditional MCS (Monte Carlo simulation) algorithm, the HMC-SS method has the advantages of less sampling, low cost, and high accuracy. And compared with the random walk SS method, the HMC-SS method can analyze the state space more efficiently and achieve faster convergence. In this paper, the HMC-SS method is applied to the reliability analysis and residual life assessment of gas pipeline engineering, and the sensitivity analysis of the random parameters affecting the failure probability of the pipeline is carried out. The results show that the corrosion rate, the depth of corrosion defects, and the wall thickness of the pipeline have great influence on the residual life of the pipeline, while the yield strength, working pressure, and the length of corrosion pits have no obvious influence on the failure probability and residual life of the pipeline. The analysis shows that the proposed HMC-SS method can be used as a reasonable tool for failure assessment of natural gas pipelines affected by corrosion to determine the remaining life of the pipeline system. This method provides a reliable theoretical basis for the integrity management of the gas pipeline.
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Xu, Jian-guo, Zhi-hao Chen i Ren Wang. "Mechanical Characteristic Analysis of Buried Drainage Pipes after Polymer Grouting Trenchless Rehabilitation". Advances in Civil Engineering 2021 (27.02.2021): 1–14. http://dx.doi.org/10.1155/2021/6679412.
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The application of polymer grouting in underground pipeline rehabilitation is increasing gradually. The leakage and subsidence of buried pipelines could be repaired by polymer grouting technology. In order to analyse the calculation theory of the pipeline repairing process, the Winkler model and the Vlazov model of the pipe-soil-polymer interaction based on the elastoplastic theory are established, the calculation formulas of the pipe-soil interaction under polymer grouting are derived, and the MATLAB calculation program based on the transfer matrix method is compiled. Then the calculated values are compared with the pipeline experimental values, and the influence of different factors on the internal force and deformation of the polymer-repaired pipeline under different work conditions is discussed. The results show that the values and trends of the pipe deformation and circumferential bending moment calculated by the models are consistent with the experimental results, and the results obtained by the Vlazov model are closer to the experimental values. In addition, the void at the bottom of the pipeline has a large impact on the mechanical properties of the pipeline. However, polymer grouting can repair disengaged pipelines effectively and restore their mechanical properties. The proposed methods and calculation results are valuable for pipeline polymer repairing analysis and pipeline void repairing design.
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Akintola, Sarah, Emmanuel Folorunsho i Oluwakunle Ogunsakin. "FLOW ASSURANCE IN KUMUJE WET-GAS PIPELINE: ANALYSIS OF PIGGING SOLUTION TO LIQUID ACCUMULATION". International Journal of Scientific & Engineering Research 9, nr 9 (25.09.2018): 380–86. http://dx.doi.org/10.14299/ijser.2018.09.09.
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Liquid condensation in gas-condensate pipelines in a pronounced phenomenon in long transporting lines because of the composition of the gas which is highly sensitive to variations in temperature and pressure along the length of the pipeline. Hence, there is a resultant liquid accumulation in onshore wet-gas pipelines because of the pipeline profile. This accumulation which is a flow assurance problem can result to pressure loss, slugging and accelerated pipeline corrosion if not properly handled.
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Feng, Qingshan, Shengyi Sha i Lianshuang Dai. "Bayesian Survival Analysis Model for Girth Weld Failure Prediction". Applied Sciences 9, nr 6 (18.03.2019): 1150. http://dx.doi.org/10.3390/app9061150.
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The formation and development of a dataset for pipeline systems have affected the management and decision-making of pipeline operators. The dataset, combined with a proposed theoretical analysis method, can provide significant improvement for the safe and economic operation of pipelines. On the basis of the pipeline data and its essential impact on pipeline risk assessment, the authors propose for the first time the Staged Bayesian failure model for girth welds of a pipeline, using the “tree-type” accident theory and Bayesian survival analysis method. This model of girth welds is consistent with the distribution of Kaplan–Meier functions and can predict the influence of different factors on the survival probability of girth welds. These new research results can lay the technical foundation for the failure analysis of pipeline girth welds.
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Safarudin, Mochamad, i Joga Dharma Setiawan. "Structural analysis for in-service gas pipeline lowering using numerical method". MATEC Web of Conferences 159 (2018): 01058. http://dx.doi.org/10.1051/matecconf/201815901058.
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Construction of new highways, buildings, airport runways and other facilities is often planned at locations where aboveground pipelines are present. Relocating such lines can be extremely expensive in terms of shutdown time and new pipeline materials. Lowering this existing pipeline can have big cost benefits. The line can be lowered while remaining in service with no lost production and the cost of such lowering an existing pipeline section is relatively cheap. In this paper, the calculation method with both analytically and numerically are discussed and explained in a 28 in pipeline lowering process while keep the pipeline is safe and still in-service.
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Petrescu, L., B. C. Cheşca, V. Ioniţă, E. Cazacu i Maria-Cătălina Petrescu. "3D Analysis of Pipeline with Cathodic Corrosion Protection". Scientific Bulletin of Electrical Engineering Faculty 22, nr 2 (1.12.2022): 10–17. http://dx.doi.org/10.2478/sbeef-2022-0014.
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Abstract Natural gas is an indispensable resource for human life. Its transport is usually done through underground pipelines. Due to the environment in which they are placed, the pipelines are subjected to a continuous process of corrosion. This paper aimed a 3D numerical analysis using specialized software (COMSOL Multiphysics) to study several parameters that influence the corrosion of underground pipelines. Starting from real geometric and environmental data, a comparative analysis was performed, considering the pipeline coating (e.g., with HDPE - high- density polyethylene), the placement of the cathode protection electrode, and the soil conductivity near the pipeline. The results confirm the need to cover the pipelines and can be a starting point for choosing the final configuration of the cathodic protection system.
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Chen, Shengtao, Kai Teng, Kang Zhang, Xiaolu Wang, Lei Xia, Meiyu Zhang, Yibo Zhang i Yongjun Gong. "Passability and Internode Mechanics Analysis of a Multisection Micro Pipeline Robot". Actuators 12, nr 4 (24.03.2023): 137. http://dx.doi.org/10.3390/act12040137.
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In submarine oil and gas pipelines, the movement of a differential pressure multisection pipeline robot mainly relies on the front and rear driving pressure difference of the fluid and the friction between the cup and the pipe wall. The passability of the pipeline is a key point to guarantee success in scanning and detecting the inner wall of a pipeline by robot. When the multisection pipeline robot moves, the force of the internode connection points changes the degree of freedom of the robot. The existence of the connection points causes speed fluctuations in the robot during the movement process which, in turn, affects the detection accuracy of the pipeline. Consequently, a systematic analysis of the connection point movement is of great importance. In this paper, a rigid–flexible, coupled, multibody, dynamic motion system is established, where a multisection micro pipeline robot is built. The cup of the robot is set as a flexible body. The motion law of the differential pressure multisection pipeline robot is analyzed through simulation, and the robot’s motion speed and internode stress of the different cabin sections are explored jointly in practice. Taking the transportation of an oil and gas pipeline into full consideration, the motion law and force of the multisection pipeline robot are analyzed by changing the bulge and turning the radius of the inner wall of the pipeline. A corresponding experimental bench is built to explore the effects of different numbers of cups and lengths of the cabin sections on the turning characteristics of the robot. Simulations and experiments results are highly similar and within the error range. To this end, the presented work provides significant information for the model selection of multisection micro pipeline robots in the fields of submarine oil and gas pipelines.
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Wu, Pan, i Minghui Wei. "Analysis of Magnetic Anomaly Characteristics of Underground Non-Coplanar Cross-buried Iron Pipelines". Journal of Environmental and Engineering Geophysics 25, nr 2 (czerwiec 2020): 223–33. http://dx.doi.org/10.2113/jeeg19-092.
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The non-coplanar cross-buried pipelines are a common way of pipeline wiring. In order to investigate the magnetic anomaly characteristics of the non-coplanar cross-buried pipelines and guide the site operation, the influences of a series of factors on the magnetic anomaly of the non-coplanar cross-buried pipelines are analyzed. Based on the principle of magnetic dipole construction, a forward model is established for the magnetic anomaly characteristics of the subsurface non-coplanar cross-buried pipelines. The basic characteristics of magnetic anomaly for the non-coplanar cross-buried pipelines are defined. The influences of geomagnetic parameters (geomagnetic intensity, geomagnetic inclination, and geomagnetic declination), pipeline parameters (thickness, magnetic susceptibility), and cross angle of pipelines on the characteristics of magnetic anomalies are analyzed. The results show that the shape of the total magnetic anomaly is mainly affected by the magnetic inclination, and the curve of magnetic anomaly at ± I site shows some symmetry. The amplitude is approximately linearly affected by the total geomagnetic field, magnetic declination, pipeline thickness, material magnetic susceptibility, and pipeline cross angle. There is a periodic change of the amplitude with the increase of geomagnetic inclination (−90°–>90°). The crest-trough distance is mainly affected by geomagnetic inclination, magnetic declination, thickness, magnetic susceptibility, and pipeline cross angle. A more accurate measurement can be achieved if the direction of the pipelines is roughly measured and then the number of measurement points is augmented near the intersection of pipelines and the measurement lines. Present work obtains the equivalent magnetic dipole units by segmenting pipelines. The magnetic anomaly characteristics of non-coplanar crossed iron pipelines are successfully simulated. The numerical results are in accordance with the experimental analysis.
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Zhang, KunYong, Jose Luis Chavez Torres i ZhenJun Zang. "Numerical Analysis of Pipelines Settlement Induced by Tunneling". Advances in Civil Engineering 2019 (3.02.2019): 1–10. http://dx.doi.org/10.1155/2019/4761904.
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Three-dimensional finite element method analysis on the tunnel-soil-underground pipeline was carried out based on the ABAQUS program. PSI element was applied to simulate the interaction between the pipelines and soil. Parameters such as an elastic modulus of soil, stress release rate, at-rest lateral pressure coefficients, an elastic modulus of pipelines, and buried depths of tunnels were analyzed. The effects of tunnel excavation on the displacement of existing pipelines were investigated, and the settlement relationships were obtained. The relationship between each parameter and surface settlement was determined by the grey relational analysis method to analyze each parameter’s sensitivity to the settlement of the pipeline, which can provide a reference for emphasis and methods of shield tunneling support. Finally, a formula of the settlement relationship between the maximum surface settlement and pipelines deformation was proposed for different pipe-soil relative stiffness. The formula was applied in the practical case. Compared with the field monitoring results and FEM computer results, it has been found that the proposed normalized formula is consistent with the measured results and numerical simulation of the pipeline settlement.
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Li, Junlin, i Yujia Li. "Analysis of Factors Affecting the Pigging Effect". Academic Journal of Science and Technology 9, nr 3 (12.03.2024): 211–16. http://dx.doi.org/10.54097/b5t0fv54.
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In order to ensure production and life safety in the process of oil and gas production, it is necessary to regularly perform pigging operations on pipelines. The fluid-solid coupling effect between the pig and pipeline impurities is complex, and theoretical methods are difficult to solve. Related experimental research is costly and experimental data is difficult to obtain. In order to further explore the factors affecting the cleaning effect of pigs in bi-metal composite pipes, this paper introduces fluid-solid coupling and uses the CEL method to establish a fluid-solid coupling model for the pig, pipeline impurities, and pipeline. The cleaning effect of the pipeline impurities is analyzed in terms of the shape, interference fit amount, and speed of the pig.
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Zuo, Zhe. "Quantitative Risk Analysis for Natural Gas Long-Distance Pipeline Leakage". Advanced Materials Research 1030-1032 (wrzesień 2014): 661–64. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.661.
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The risk of natural gas long-distance pipeline and main factors of accidents are analyzed in this paper. According the consequences from above, quantitative risk assessment of long-distance pipelines under specific accident scenarios are completed with the help of numerical simulation model on long-distance pipeline leakage and dispersion. What’s more, on the basis of the assessment results, the necessary conditions for long-distance pipeline safe operation are presented. Finally, conclusions and safe operations under necessary conditions given in this paper are helpful for regular operation of pipeline, accident prevention, emergency response and reasonable supervision.
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Kouretzis, George P., Dimitrios K. Karamitros i Scott W. Sloan. "Analysis of buried pipelines subjected to ground surface settlement and heave". Canadian Geotechnical Journal 52, nr 8 (sierpień 2015): 1058–71. http://dx.doi.org/10.1139/cgj-2014-0332.
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This paper presents an analytical methodology for the calculation of internal forces and strains developing in continuous buried pipelines that cross geotechnically problematic areas and are susceptible to permanent ground surface settlement or heave. Material nonlinearity effects are introduced in the solution via an iterative procedure, while taking into account the effect of pipeline elongation on its response. The use of a versatile bilinear expression to describe the stress–strain response of the pipeline material renders the method appropriate for steel, high-density polyethylene (HDPE), concrete, and cast iron pipelines alike. Comparison of the analytical results against those from benchmark finite element analyses highlights the effectiveness of the simplified analysis. The method is a potential alternative to elaborate three-dimensional nonlinear numerical analyses that are often used in pipeline design practice, and offers ease-of-use with no expense in accuracy, at least for problems involving simple pipeline geometries.
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Yan, Yi Fei, i Lu Feng Cheng. "The Finite Element Analysis on the Submarine Pipeline under the Seismic Loading". Advanced Materials Research 490-495 (marzec 2012): 2977–81. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2977.
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Seismic loading is one of the most important factors of submarine pipeline damage, so the research on submarine pipeline failure mechanism is still lifeline engineering frontier topics. According to Biot consolidation theory, considering the interaction of submarine pipelines with the soil medium under earthquake action, the model of the seabed-pipeline interaction is established. The influences of wall thickness, radius and cover layer thickness on submarine pipeline strain response are studied under El Centro seismic wave based on this model. The calculating results show that effective stress and axial strain of the submarine pipeline increases with wall thickness, radius and cover layer thickness increasing.
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Ding, Ziyue, Lingyao Jia, Linxi Tian i Xiangxiang Li. "Analysis of Common Problems and Improvement Measures of Pressure Pipeline Inspection". Journal of Theory and Practice of Engineering Science 3, nr 10 (31.10.2023): 1–10. http://dx.doi.org/10.53469/jtpes.2023.03(10).01.
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The recent pressure pipeline reform and China's opening to the outside world have become catalysts for further economic and social development. The oil fields in the northeast and the pure water projects in the southwest have benefited the residents, however, due to the working pressure problems in the pipeline transportation, which are caused by the corrosion of the pipeline materials and the various problems arising from the operation of the pipeline, resulting in long-term safety problems. Therefore, the importance of checking pipeline pressure cannot be missed. In order to ensure the safety of China's natural gas pipelines under pressure, we need to concentrate on analyzing various existing problems and quickly find solutions.
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Djekidel, Rabah, Sid Bessedik i Abdechafik Hadjadj. "Assessment of electrical interference on metallic pipeline from HV overhead power line in complex situation". Facta universitatis - series: Electronics and Energetics 34, nr 1 (2021): 53–69. http://dx.doi.org/10.2298/fuee2101053d.
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Sharing corridors between high voltage alternating current (HVAC) power lines and metallic pipelines has become quite common. Voltages can be induced on pipelines from HV power lines, which may cause a risk of electric shock to the operator and serious corrosion damage on metallic pipelines. This paper aims to examine the capacitive coupling between aerial metallic pipelines and HV power lines in perfect parallelism case and in general situation which is formed by parallelism, approaches and crossings, using a combination of charge simulation method and Artificial Bee Colony (ABC) algorithm. The electric field at the pipeline's surface and the induced voltage on the pipeline are strongly affected by the pipeline separation distance. The presented simulation results are compared with those obtained from the admittance matrix analysis, a good agreement has been obtained.
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Hu, Yanhua, Yukun Wang, Pengyu Jia, Jianyu Lv i Mingchao Wang. "Research on Development and Test Analysis of Full-Scale Fatigue Test System of X65 Submarine Pipeline". E3S Web of Conferences 253 (2021): 01055. http://dx.doi.org/10.1051/e3sconf/202125301055.
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The fatigue performance of welded joints of submarine pipelines is directly related to the safety and economic benefits of welded structures. Considering the limitations of fatigue calculation, anti-fatigue design and small-scale fatigue test in the evaluation and analysis of pipeline fatigue life, this paper demonstrated the feasibility, scientificity and advancement of submarine pipeline full-scale fatigue test technology in engineering applications. Consequently, a full-scale fatigue test system and its test analysis technology applied for ZY-PFS2000 pipelines have been first developed in China, in which the effects of welding residual stress, stress concentration, initial welding defects, pipeline internal pressure shutdown and internal medium fluctuations on the fatigue life of full-scale pipelines were comprehensively taken into account. Through the full-scale fatigue test (four-point bending + internal pressure) of the X65 submarine pipeline, the fatigue cycles of different specifications of pipelines under different stress amplitudes were obtained. Moreover, the fatigue loading results were evaluated and analyzed in accordance with the international standard of BS 7608 and DNV C203. The research in this paper is conducive to accumulating full-scale fatigue performance data for submarine pipelines in China, not only offering a quantitative basis for the subsequent full-scale fatigue life evaluation and the safety operation cycle, but also providing a reference direction for the future development of submarine pipeline full-scale fatigue test technology.
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Liao, Zhenhua, Guangjie Zhai i Jie Tang. "Dynamic Simulation Analysis of Aircraft Hydraulic Pipeline System under Different Pressure". Journal of Physics: Conference Series 2280, nr 1 (1.06.2022): 012051. http://dx.doi.org/10.1088/1742-6596/2280/1/012051.
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Abstract The hydraulic system is very important in the aircraft structural system, but the hydraulic pipeline is prone to cracks or even breaks due to vibration problems during system operation, causing major hidden dangers to flight safety. Using ANSYS Workbench to carry out modal analysis and harmonic response analysis of pipelines, the influence of different inlet pressures on pipeline vibration under pulsation excitation is compared and analyzed, which provides theoretical guidance for pipeline vibration research.
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Liao, Zhenhua, Guangjie Zhai i Jie Tang. "Dynamic Simulation Analysis of Aircraft Hydraulic Pipeline System under Different Pressure". Journal of Physics: Conference Series 2280, nr 1 (1.06.2022): 012051. http://dx.doi.org/10.1088/1742-6596/2280/1/012051.
Pełny tekst źródłaStreszczenie:
Abstract The hydraulic system is very important in the aircraft structural system, but the hydraulic pipeline is prone to cracks or even breaks due to vibration problems during system operation, causing major hidden dangers to flight safety. Using ANSYS Workbench to carry out modal analysis and harmonic response analysis of pipelines, the influence of different inlet pressures on pipeline vibration under pulsation excitation is compared and analyzed, which provides theoretical guidance for pipeline vibration research.
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Hou, Xiangqin, Yihuan Wang, Peng Zhang i Guojin Qin. "Non-Probabilistic Time-Varying Reliability-Based Analysis of Corroded Pipelines Considering the Interaction of Multiple Uncertainty Variables". Energies 12, nr 10 (22.05.2019): 1965. http://dx.doi.org/10.3390/en12101965.
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Reliability analysis of corroded pipelines is critical to the integrity and safe working of pipeline infrastructure. Aiming at less probability information is obtained for corrosion pipeline engineering, and the mechanical properties of pipeline with corrosion defects deteriorate caused by the accumulative effect of corrosion growth. Based on the quasi-static analysis method and non-probability theory, this paper presents a reliability model for assessing corroded pipelines with corrosion growth. In fact, reliability analysis of corroded pipelines needs to consider the interaction of multiple uncertainty variables. By introducing interaction theory, a mathematical model of corrosion defects considering the interaction of variables is put forward. Moreover, this paper develops a non-probabilistic time-varying reliability method for pipeline systems with multiple defects. Thus, several numerical examples are investigated to discuss the effectiveness of the proposed methodology. The results show that a two-dimensional or even three-dimensional ellipsoid model with correlation has more accurate results to evaluate corroded pipelines under the interaction of multiple corroded defects with poor information. Furthermore, a non-probabilistic time-varying reliability model is established according to the time-varying characteristics of the corroded pipeline under the influence of multiple factors. An effective complement to the theory of non-probabilistic reliability analysis of system is investigated. The analysis of the results suggests that interaction of corroded pipeline has a negligible impact on reliability. It also provides a theoretical basis for maintenance and is of great significance for risk- and reliability-informed decisions regarding buried oil and gas pipelines.
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Spanos, P. D., A. Sofi, J. Wang i B. Peng. "A Method for Fatigue Analysis of Piping Systems on Topsides of FPSO Structures". Journal of Offshore Mechanics and Arctic Engineering 128, nr 2 (3.10.2005): 162–68. http://dx.doi.org/10.1115/1.2185126.
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Pipelines located on the decks of FPSO systems are exposed to damage due to sea wave induced random loading. In this context, a methodology for estimating the fatigue life of fluid-conveying pipelines is presented. The pipeline is subjected to a random support motion that simulates the effect of the FPSO heaving. The equation of motion of the pipeline is derived by assuming small amplitude displacements, modeling the empty pipeline as a Bernoulli-Euler beam, and adopting the so-called “plug-flow” approximation for the fluid (Fluid-Structure Interactions Slender Structures and Axial Flow, Academic Press, San Diego, Vol. 1). Random vibration analysis is carried out by the Galerkin method selecting as basis functions the natural modes of a beam with the same boundary conditions as the pipeline. The discretized equations of motion are used in conjunction with linear random vibration theory to compute the stress spectrum for a generic section of the pipeline. For this purpose, the power spectrum of the acceleration at the deck level is determined by using the Response Amplitude Operator of the FPSO hull. Finally, the computed stress spectrum is used to estimate the pipeline fatigue life employing an appropriate S-N fatigue curve of the material. An illustrative example concerning a pipeline simply supported at both ends is included in the paper.
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Prodous, O. A., A. A. Malysheva, I. A. Abrosimova i A. G. Chelonenko. "Hydraulic analysis of gravity flow water distribution with internal deposits". Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 24, nr 3 (26.06.2022): 173–79. http://dx.doi.org/10.31675/1607-1859-2022-24-3-173-179.
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Purpose: The purpose of this work is to suggest dependencies for pipelines with deposits in gravity flow water distribution systems. Methodology/approach: Hypotheses and formulas for the pipeline hydraulic analysis; regulatory documents on the water disposal. Research findings: The paper presents the hydraulic analysis equations of gravity flow water distribution with internal deposits. The current regulatory documents contain methods of the hydraulic analysis for new pipelines only. At the same time, deposits of various structure can appear on the pipeline walls under certain conditions, which affect the hydraulic parameters of the system. The dependences are suggested for pipelines with deposits and the concept is proposed for the reduced pipe diameter. Value: Further directions are identified for studying the influence of the thickness of the sediment layer in the pipeline on its hydraulic properties. A need for tabulating the results of the hydraulic analysis of pipes with gravity flow distribution with internal deposits is substantiated.
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Mustaffa, Zahiraniza, Mohammed A. M. Al-Bared, Nursyahira Habeeb i Mudassir A. Khan. "Examining the effect of Debris Flow on Oil and Gas Pipelines Using Numerical Analysis". Global Journal of Earth Science and Engineering 9 (7.09.2022): 74–87. http://dx.doi.org/10.15377/2409-5710.2022.09.6.
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This article examines the impact of debris flow on semi-exposed pipelines to determine the plastic deformation and stresses by considering pipe-debris flow interaction. A 3-D finite element approach was adopted to study the mechanical behavior of pipelines subjected to debris flow. Integration of pipeline property (thickness) with debris flow intensity (impact pressure and angle) was also considered in a finite element numerical model for semi-exposed. The analysis showed that the impact angle between 35° and 75° with an impact pressure of 200 kPa and 250 kPa significantly affected the stability and integrity of the pipeline. There was a slight impact of wall thickness on the stability of the pipeline due to the passive soil resistance. Maximum plastic deformation of 124 mm was encountered in the case of 35° impact angle, which was 3% more than the deformation observed at 20° impact angle. Moreover, large distribution of von mises stresses was observed, as 1390 Mpa, 1450 Mpa, 1440 Mpa, and 1440 Mpa for impact angles of 20°, 35°, 75°, and 90° in the impacted zone of the pipeline in each set of analysis. Shear failure of the pipeline was observed during the analysis as von misses’ stresses were more than the yield stress (520 Mpa) of the pipeline. The developed model in this study can be utilized for further research and will be a basis for designing pipelines crossing through mountainous regions.
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Xie, Zhiqiang, Fengshan Jiang, Jiarui Xu, Zhengang Zhai, Jianglong He, Daoyang Zheng, Junyu Lian i in. "A Narrative of Urban Underground Pipeline System Disasters in China in 2021: Spatial and Temporal Distribution, Causal Analysis, and Response Strategies". Sustainability 15, nr 13 (25.06.2023): 10067. http://dx.doi.org/10.3390/su151310067.
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In recent years, there have been frequent disasters and accidents in the underground pipeline system of Chinese cities, posing a continuous threat to the safety of life and property of the public and the order of urban operations. This article uses statistical data on the spatiotemporal distribution of major underground pipeline disasters in various provinces of China in 2021. By using Pearson’s correlation coefficient and regression analysis, a causal analysis model for urban underground pipeline accidents is constructed, and the correlation between urban underground pipeline accident rate and economic and social indicators is analyzed. From the analysis, it has been found that the correlation coefficients of gross domestic product (GDP) per capita, the pipeline density in the built-up area, and the urban pipeline accident rate reach −0.4019 and −0.4275, respectively, showing a negative correlation. Further, the regression analysis results show that the underground pipeline accident rate shows a decreasing trend as the per capita GDP and the density of pipelines in the built-up areas increase. Among them, the results of the power function fitting model show that the GDP per capita accounts for 48.10% of the urban underground pipeline accidents, whereas the pipeline density of the built-up area accounts for 58.27% of these accidents. The construction of underground pipeline regulations is influential in reducing underground pipeline disaster accidents. In this study, the role and effectiveness of the factors, such as the construction of professional regulations in maintaining the safe operation of urban underground pipelines, has been discussed, and suggestions and methods to improve the problems that need to be solved, such as the construction of a municipal supporting emergency management system in the safe operation of underground pipelines in the future, have been proposed.