Construction Of Lines Research Articles

Designing electricity distribution networks: The impact of demand coincidence

With the global effort to reduce carbon emissions, clean technologies such as electric vehicles and heat pumps are increasingly introduced into electricity distribution networks. These technologies considerably increase electricity flows and can lead to more coincident electricity demand. In this paper, we analyze how such increases in demand coincidence impact future distribution network investments. For this purpose, we develop a novel model for designing electricity distribution networks, called the distribution network reconfiguration problem with line-specific demand coincidence (DNRP-LSDC). Our analysis is two-fold: (1) We apply our model to a large sample of real-world networks from a Swiss distribution network operator. We find that a high demand coincidence due to, for example, a large-scale uptake of electric vehicles, requires a substantial amount of new network line construction and increases average network cost by 84% in comparison to the status quo. (2) We use a set of synthetic networks to isolate the effect of specific network characteristics. Here, we show that high coincidence has a more detrimental effect on large networks and on networks with low geographic consumer densities, as present in, e.g., rural areas. We also show that expansion measures are robust to variations in the cost parameters. Our results demonstrate the necessity of designing policies and operational protocols that reduce demand coincidence. Moreover, our findings show that operators of distribution networks must consider the demand coincidence of new electricity uses and adapt investment budgets accordingly. Here, our solution algorithms for the DNRP-LSDC problem can support operators of distribution networks in strategic and operational network design tasks.

Power investment and transmission network expansion in China and its neighbouring countries towards carbon neutrality

Transnational power cooperation contributes to promoting the large-scale use of renewable energies in Asia, but how to develop the structure of power transmission network deserves careful investigation. This paper thoroughly investigates the structure of power investment and transmission network in China and neighbouring countries, aiming to promote the large-scale use of renewable energies around Asia. Various power-generation and power-transmission technologies are considered in detail, and transnational power interconnection risk cost and carbon emission cost are embedded into a bottom-up optimization model. The future power-generation structures and networks installed under various policy scenarios are analysed in detail, and the corresponding economic, carbon emission reduction and renewable energy consumption benefits are evaluated. The results show that power transmission between China's internal regions and neighbouring countries can save $56.7 billion for the entire power system through the large-scale grid integration of renewable energy. The installed capacities of wind power, solar power, and hydropower renewable energy power generation could be increased by 141 GW, 163 GW, and 58 GW, respectively. The construction of transnational transmission lines from Central Asia to Northwest China, Mongolia to North China, the Russian Far East to Northeast China, and Northeast China to South Korea could effectively promote the utilization of renewable energy in the Russian Far East, Mongolia and Central Asia and further reduce carbon emissions in China, Japan and South Korea.

Discussion on feature enhancement technology of audit object of power transmission and transformation project settlement based on remote sensing technology

In the rapid development of social economy and science and technology, the construction management of power transmission and transformation project began to widely use modern science and technology theory, the most representative of which is remote sensing technology. According to the data obtained by UAV digital policy image and digital surface model, soil and water conservation measures and engineering prevention and control monitoring are proposed in the integrated analysis and calculation research, which can provide technical support for the construction management of power transmission and transformation projects. Therefore, on the basis of understanding the technical content of transmission and transformation engineering line construction, this paper mainly explores the transmission and transformation engineering monitoring system based on low-altitude remote sensing technology of drones and builds an intelligent transmission and transformation engineering settlement audit platform according to the current development status of transmission and transformation engineering completion settlement audit. The final practice case proves that the remote-sensing technology based power transmission and transformation project settlement audit effect is stronger, which meets the needs of power transmission and transformation project construction management in the new era.

Selection of Foundation Types for Mechanized Construction of 220 kV Overhead Transmission Lines in Mountainous Areas Suitable for Fujian Province

The construction of overhead transmission lines in mountainous areas poses a significant challenge when it comes to foundation construction. The type of foundation selected in these areas has a direct impact on equipment selection and access road planning. Fujian Province, located on the southeastern coast of China, is predominantly hilly and mountainous. Therefore, selecting an appropriate foundation for overhead transmission lines is crucial for successful mechanized construction of transmission lines in this region. In this study, we aimed to enhance the economy of mechanized construction of the foundation of the 220 kV overhead transmission lines in Fujian Province. We analyzed the typical geological conditions and foundation reactions in the area and compared the construction costs of mechanical pile foundations, mechanical digging foundations, and rock anchor foundations. The results show that the mechanical pile foundation requires the least amount of concrete when the foundation reaction of the 220 kV suspension tower is less than 1700 kN and the foundation reaction of the 220 kV tension tower is less than 1300 kN. Additionally, the quantity of the rock anchor foundation is less than that of the digging foundation. In terms of cost, the rock anchor foundation is the most economical, followed by the mechanical pile foundation and then the digging foundation.

Analisis Muka Air Banjir Sungai Segeri Pada Persilangan Jalur KA Lintas Makassar-Pare-Pare

The construction of the Makassar-Parepare railroad line that crosses Pangkep district which intersects with the Segeri river is at an altitude of +10,229 m. The Segeri River is in the Pangkajene Watershed area with the Segeri Sub-watershed which has an area of 96,011 Km2. Segeri river flood discharge was calculated using the Nakayashu method with discharge values with return periods of 2,5,10,25 and 50 years of 102.27 m3/second, 125.99 m3/second, 146.06 m3/second,176.89 m3/second and 204.28 m3/second. The flood water level of the Segeri river at discharge with a 50year return period is at an elevation of +3.07 m, so that the flood water level of the Segeri river is below the railroad elevation

STUDENTS OF CHUVASHIA ABOUT THE GREAT PATRIOTIC WAR, THE CONSTRUCTION OF SURSKY AND KAZAN DEFENSIVE LINES

The relevance of the study is determined by the importance of patriotic education in modern youth, instilling in them a sense of belonging to the history of the Homeland.
 
 The purpose of the article is to analyze the opinions of students about the events of the Great Patriotic War, to identify their level of knowledge about the construction of Sursky and Kazan defensive lines in Chuvashia in the initial period of the war, to consider the sources of information of young people about these events.
 
 Materials and methods. The empirical basis for writing this article was made by the materials of a survey of students in March 2023, in the organization and conduct of which the authors of the article participated. A total of 517 respondents took part in the survey. In order to implement the comparative historical method, data from earlier surveys of students were also involved.
 
 Results. During the survey, students noted that among the historical events in Russia, the most significant of them is the victory in the Great Patriotic War. There is also a high level of interest in the events of the last war, which reaches 85% among the respondents. The data obtained also indicate a noticeable increase in the proportion of those who, to one degree or another, had heard about the construction of Sursky and Kazan defensive lines in Chuvashia. Information sources about these events remained traditional, but the information received in educational institutions became more noticeable.
 
 Conclusions. The materials obtained during the survey of university students of Chuvashia showed that the memory of the Great Patriotic War is the most important element of the historical memory of young people. The data we obtained showed the possibility of actively influencing the historical memory of young people by combining administrative resources and the public initiative.

The Optimization of Secondary Lining Construction Time for Shield Tunnels Based on Longitudinal Mechanical Properties

In the field of shield tunnels, the occurrence of uneven longitudinal settlement in segment linings has presented persistent challenges, including heightened risks of localized damage and water leakage. While the adoption of a secondary lining has been proposed as a viable solution to these issues, the question of how to select an appropriate construction time for the secondary lining, one that enables it to fully harness its load-bearing capacity while optimizing the tunnel’s overall stress and deformation characteristics, continues to be a pressing concern. To address this issue, this study established a three-dimensional longitudinal refined numerical model of double-layer-lined shield tunnel. In addition, the deformation degree of the segment lining was used as a time indicator to define the construction time for the secondary lining. Subsequently, an analysis of the impact of the construction time of the secondary lining on the longitudinal mechanical properties of the double-layer-lined shield tunnel is conducted through an assessment of tunnel longitudinal deformation and structural stress. The research findings indicated that the construction of the secondary lining improved the longitudinal deformation resistance of shield tunnels. Simultaneously, it led to a significant increase in the longitudinal shear forces within the segment lining and a notable reduction in longitudinal bending moments. Moreover, the construction time of the secondary lining played a pivotal role in these alterations. Considering the longitudinal force situations and load-bearing characteristics of the double-layer lining structure, it was determined that the optimal construction time for the secondary lining fell within the range of 20% to 40% of the total construction duration. In this scenario, the deformation and internal forces within the segment lining remained within permissible limits. Additionally, both the segment lining and the secondary lining were able to fully utilize their load-bearing capacities, ensuring the economic and safety aspects of the tunnel.

Soil cover transformation after the laying of a high-voltage power line

Today the rate of anthropogenic transformations of the soil cover significantly exceeds the rate of its natural restoration. According to a modern digital soil map at a scale of 1 : 200,000 in the Leningrad Region anthropogenically modified subtypes of natural soils, which were formed as a result of human economic activity, predominate. The article considers anthropogenic changes in soils and soil cover of the territory of the high-voltage power line. The study area of 100×500 meters is located in the Tikhvinsky district between the settlements of Kalivets and Novaya Ust-Kapsha. The landscape of the territory belongs to the lake-glacial plain, the soil-forming rocks are lake-glacial sands and sandy loam. Natural soils that are not affected by technological works are found only in the forest, outside the clearing laid during the construction of the power line. These are Albic Podzol, Entic Podzol, Histic Albic Podzol, Histic Entic Podzol and Histic Gleysol. It was revealed that in the study area, the horizons of the original natural soils are partially or completely cut off, turbated, compacted, which led to the formation of their anthropogenically transformed subtypes: over-compacted, abraded, turbid and stratified. Sometimes soil material is exposed to the surface and moved over the study area by tens of meters. After the construction of the high-voltage line, new formations appeared in the soil cover, such as Podzol Nudispodic, buried soils and several types of non-soil formations. It is revealed that each technological operation (logging, installation of power transmission line supports, organization of places for technological operations and the creation of temporary roads) is characterized by its own special disturbances in the soil cover. Thus, after the construction of the power line, there were no natural soils with an undisturbed structure in the soil cover. In addition to the fundamental transformation of the soil cover at the site, natural vegetation was reduced, the mesorelief was partially disrupted and the microrelief was almost completely changed. All these anthropogenic transformations will affect the quality of the ecological functions of the soil cover. During the further operation of power transmission lines, such as clearing a cut-out clearing, updating fire-prevention mineralized strips, maintaining the power grid, disturbances of the soil cover will be periodically repeated, preventing the ecosystem from returning to its original state.

Analysis of Overpass Displacements Due to Subway Construction Land Subsidence Using Machine Learning

Modern cities are full of complex and substantial engineering structures that differ by their geometry, sizes, operating conditions, and technologies used in their construction. During the engineering structures’ life cycle, they experience the effects of construction, environmental, and functional loads. Among those structures are bridges and road overpasses. The primary reason for these structures’ displacements is land subsidence. The paper addresses a particular case of geospatial monitoring of a road overpass that is affected by external loads invoked by the construction of a new subway line. The study examines the methods of machine learning data analysis and prediction for geospatial monitoring data. The monitoring data were gathered in automatic mode using a robotic total station with a frequency of 30 min, and were averaged daily. Regression analysis and neural network regression with machine learning have been tested on geospatial monitoring data. Apart from the determined spatial displacements, additional parameters were used. These parameters were the position of the tunnel boring machines, precipitation level, temperature variation, and subsidence coefficient. The primary output of the study is a set of prediction models for displacements of the overpass, and the developed recommendations for correctly choosing the prediction model and a set of parameters and hyperparameters. The suggested models and recommendations should be considered an indispensable part of geotechnical monitoring for modern cities.

Information provision, accounting and analysis of food losses and waste: EU experience for Ukraine

Purpose. The purpose of the study is to substantiate the theoretical, methodological and methodical foundations for the formation of the system of accounting, analysis and information base of food losses and waste in Ukraine.
 Methodology / approach. The collection of information for conducting a scientific study was carried out using qualitative (literature review, research of ideas and experience on research issues) and quantitative (study of quantitative indicators of food losses in production and sales chains in Ukraine) methods based on the description of secondary research (synthesis of existing knowledge and analysis of established trends). Data analysis was carried out using thematic analysis (systematization of scientific results from research issues), statistical method (construction of a trend line and determination of forecast data), the method of comparisons (selection of a specific system based on qualitative analysis) and generalizations (substantiation of proposals and formation of conclusions).
 Results. The need to introduce in Ukraine the accounting methodology for food losses and waste, recommended by FAO is determined; the expediency of using the mass flow analysis method is substantiated; systematized data sources of information provision for food losses and waste monitoring. As a result of a critical analysis of theoretical, methodological and methodical principles regarding the formation of a system of accounting, analysis and information base of food losses and waste in Ukraine, the authors proposed a system of accounting, analysis and information provision of food losses and waste in Ukraine. The proposed system includes 1) a methodological basis for accounting for food losses and waste, 2) a method of analysis in the accounting system food losses and waste, and 3) information support for accounting and analysis of the process of food losses and waste.
 Originality / scientific novelty. For the first time, a study of the methodology of accounting for food losses and waste, methods of analysis and information provision of this process in the EU was conducted, based on the results of which approaches to the formation of a corresponding system in Ukraine were proposed.
 Practical value / implications. The application of a unified methodology of the food losses and waste accounting system will allow accurate quantitative assessment of food losses and waste in Ukraine, which will be suitable for international comparison, tracking progress in achieving the target indicators of the SDG12, developing relevant policies and applying effective frameworks for reduction of food losses and waste in Ukraine. This work emphasizes the need for further empirical research aimed at the quantitative analysis of food losses and waste in Ukraine, as well as the assessment of the losses caused by the russian federation in the agricultural sector and the reduction of the food potential of our country, which is a significant component of reparations and contributions from the aggressor state.

Upregulation of FAM134B inhibits endoplasmic reticulum stress-related degradation protein expression and promotes hepatocellular carcinogenesis.

Endoplasmic reticulum (ER) stress can stimulate the proliferation and metastasis of hepatocellular carcinoma (HCC) cells while hindering apoptosis and immune system function, but the molecular mechanism of ER stress in HCC has yet to be fully studied. We aim to investigate the molecular mechanism by which FAM134B inhibits autophagy of HCC cells by reducing the expression of ER stress-related degradation proteins. Clinical samples were collected for this study. Normal liver cell lines HL7702 and Hep3B and Huh7 HCC cell lines were cultured. Construction of FAM134B knockdown cell line. Cell proliferation was measured using the CCK-8 assay, while cell migration and invasion capabilities were detected using the plate colony formation assay. Flow cytometry was used to detect the apoptosis rate. Transmission electron microscopy was used to observe the formation of autophagosomes. qRT-PCR and WB detective expression changes related to autophagy proteins. Finally, the expression of the relevant proteins was observed by immunohistochemistry. The expression of FAM134B was significantly increased in human liver cancer tissue and HCC cell lines Hep3B and Huh7. After the lentiviral vector was transfected into Hep3B cells with sh-FAM134B, results showed that sh-FAM134B could effectively inhibit Hep3B cell proliferation and promote HCC cell apoptosis. Meanwhile, sh-FAM134B could effectively induce the autophagy of Hep3B liver cancer cells. Immunohistochemistry results showed that sh-FAM134B could effectively induce ER stress. FAM134B inhibits HCC cell autophagy and promotes the progression of liver cancer by inhibiting the expression of ER stress-related degradation factors such as DERL2, EDEM1, SEL1L and HRD1.

PROSPECTS FOR THE USE OF ELECTRIC BUSES IN UKRAINE

The article considers the feasibility of using electric buses in Ukraine. As a result of the literature analysis, it was found that electric transport has a number of advantages over traditional cars. This type of transport in medium-sized cities can be represented by trolleybuses and electric buses. When using trolleybuses, significant capital investments are required for the construction of electrical lines and substations. The main advantages of electric buses are low operating costs, reduction of general background noise in the city, increased comfort for passengers due to low noise and vibrations in the cabin, and the absence of harmful emissions. Performed technical and operational analysis based on planning data for the main types of urban public transport. A method for assessing the economic efficiency of using electric vehicles has been developed. The economic feasibility of using electric buses in medium-sized cities where public transport is represented by buses and trolleybuses is considered. The research methods are theoretical. The savings in operating costs from replacing a bus with an electric bus of similar passenger capacity are UAH 1 million 600 thousand per year, and from replacing a trolleybus – UAH 1 million 250 thousand UAH per year. As of the beginning of 2022, the cost of running 1 km of an electric bus is UAH 7.2, a trolleybus is UAH 18.8, and a bus is UAH 22. The disadvantage of electric buses, which hinders their wider distribution, is the high cost of batteries, which can be up to 50% of the total cost, as well as lower passenger capacity compared to other modes of transport. A way out of the situation can be the installation of cheaper batteries of smaller capacity on electric buses and the use of recharging at the final stops.
 ання підзарядки на кінцевих зупинках.

Numerical study on the indoor flow field and ventilation performance in the power room of a hybrid locomotive that passes through a tunnel

Under the background of energy saving, emission reduction, and green transportation, the electrification construction of railway lines is difficult owing to long cycles and high costs. Hybrid locomotives have emerged as fuel locomotives that can run on electrified lines and that achieve energy saving, emission reduction, and railway emergency on non-electrified lines. Train power equipment is highly integrated in the locomotive power room, which leads to the ventilation and heat dissipation performance of indoor high-heat equipment becoming one of the main factors that affect the safe operation of trains. This study focuses on the flow field and ventilation of locomotive power rooms in railway vehicle/tunnel systems and explores the variation of the ventilation flow rate and flow field in a power room when trains pass through a tunnel at different speeds. Based on the unsteady Reynold-averaged Navier–Stokes (RANS) equations and shear-stress transformation (SST) k-ω turbulence model, the relative motion between a train and a tunnel is simulated by sliding mesh, and the related algorithm settings are verified through experiments. The results show that: train speed is linearly related to the air inlet flow rate, and trains have a critical speed, which affects the original indoor air-cooling circulation system. This critical speed is reduced by the tunnel environment; The propagation and superposition of the pressure wave in a tunnel have no evident effect on the flow rate of the power room vent; Train speed is negatively correlated with the fan efficiency; thus, it deteriorates the fan efficiency in the tunnel environment; The symmetrical distribution of ventilation openings in a power room can effectively balance the fresh-air flow, but it is not conducive to cooling equipment located near the locomotive. These conclusions can contribute to improving future designs of the ventilation systems of hybrid electric locomotive power rooms.

Успех бизнес-плана компании AT&T

It is shown that AT&T’s purchase of patent rights to his audion from Lee de Forest in 1912 made the New York – San Francisco transcontinental telephone line project a realty. The features of the construction of this telephone line and the difficulties that arose in this case are considered. Attention is paid to the development of electrical circuits and designs of tube repeaters, as well as their installation on a telephone line. The principles of operation of tube repeaters of type 21 and 22 are analyzed. The results of the first testing of the line on July 29, 1914 are given. A memorable day was marked on January 25, 1915 – the day of the solemn launch of the transcontinental telephone line into commercial operation 25 days before the opening of the Panama-Pacific International Exhibition in San Francisco.

Kajian Kemampuan Bangunan Hikmat Menjaga Keamanan Insfrastruktur Kereta Api dari Bahaya Banjir

In an effort to improve accessibility between regions and economic equality, the government has built many transportation supporting infrastructure such as toll roads, ports and railways. The construction of road and rail-based transportation lines will have an impact on the environment, especially transportation routes that cut through watersheds. The cutting of the watershed by the infrastructure of transportation facilities causes changes in the flow pattern of rainwater falling in the catchment area resulting in flooding. On the railway-based transportation line, to drain flood discharge, the Hikmat Building (BH) was built. The Wisdom Building is a building that cuts a railway track similar to a bridge or culvert, so that water can flow under the railway track. As a flood control building, wisdom building must be able to drain flood discharge that occurs both from upstream and from the halir of a watershed. The flood discharge that must be served by the wisdom building consists of three sources, first from the water discharge of the railway line drainage channel and second from the Catchment Area (DTA) / Catchment Area, and third the flow of water due to overflowing water discharge from the nearest river downstream of the Catchment Area. The calculation of the flood discharge of the Lematang Hilir Sub watershed with a 25-year anniversary of 131.94 m3 / s, while the installed wisdom building is only able to drain 78.74 m3 / s. For this reason, it is necessary to build a new wisdom building in the form of a box culvert with dimensions of 1.5 x 1.5 m as many as 10 units with a total drainage capacity of 77.10 m3 / s. The analysis only considered the ability of the Lematang River to receive flood discharge from upstream under normal conditions.

Low-impact line construction retains and speeds recovery of trees on seismic lines in forested peatlands

Seismic lines are linear features created by the oil and gas industry for energy exploration. Though individually narrow, collectively seismic lines are a pervasive management challenge, resulting in changes to biogeochemical cycles, plant and animal abundance and behaviour, predator–prey relationships, and forest successional trajectories. These impacts arise from historical construction methods that used bulldozers to remove vegetation and substrate leaving lines as persistent openings in a state of arrested succession. In the mid-1990s, “low-impact seismic” (LIS) line construction began, using mulchers to remove vegetation aboveground to minimize impacts and hasten reforestation. Here, we evaluated the effectiveness of LIS in retention, recruitment, and growth of seedlings in forested peatlands in northeast British Columbia. Retained and recruited trees on LIS lines were found at 69% and 64% of sites, had mean densities of 3400 and 6000 stems/ha, and mean heights of 42 and 11 cm, respectively. These LIS lines appeared to recover along expected trajectories toward tree cover, thereby mitigating challenges typical of older seismic exploration. Our results suggest it is feasible to further fast-forward line recovery by ensuring mulcher drums are kept as high as possible to increase the number and height of trees through the mulching process.

Relationship Between Leadership Function of Gapoktan and Success Rate of Rural Agribusiness Business Development Program (PUAP)

The purpose of this study is to determine the efforts to improve infrastructure in services and economic growth as well as to determine the impact of increased infrastructure on services and economic growth. The results showed that efforts to improve infrastructure in services and economic growth one of them is the realization of the construction of the Southern Cross Line (JLS). JLS is included in one of the efforts to improve infrastructure in services and economic growth, especially in the southern part of Java. JLS development is a national project. JLS is part of the construction of the south coast of Java Road (Pansela), starting from Pacitan, Trenggalek, Tulungagung Blitar, Malang, Lumajang, Jember and Banyuwangi. The results also show that through the construction of the Southern Cross Line (JLS) is expected to improve services and economic growth, especially economic growth in the southern part of Java considering the income and economic inequality between Southern and Northern Java. The southern part of Java can be categorized as poor, given the limited access to infrastructure.

Numerical Investigation of Residual Stress Formation Mechanisms in Flash-Butt Welded Rail

For the construction of long and continuous railway lines as well as the replacement of defected rails, rails are joined using flash-butt welding. Under various localized temperatures and thermo-mechanical stresses, a residual stress can develop in the flash-butt welded joint. The residual stress can affect the performance and reliability of the welded rail, particularly in terms of progressive structural damage caused by repeated wheel load. In the present work, the mechanisms of residual stress formation in a flash-butt welded rail and the influence of upsetting force (including its temperature range and magnitude) were investigated using the thermal elastic–plastic finite element analysis. The formation mechanisms of residual stress involved the changes in thermal expansion coefficient, strain, and elastic modulus of the welded joint with respect to temperature. The calculated cooling temperatures and residual stresses in the flash-butt welded joint were in good agreement with the measured results. Compressive residual stresses were observed around the rail head and the rail foot (i.e., approximately −648 MPa at the rail head and −495 MPa at the rail foot), while tensile residual stresses were observed at the rail web (i.e., approximately 165 MPa). It was observed that the investigated compressive upsetting force predominantly induced plastic deformation within the welded joint, resulting in minimal alteration of stress. Consequently, the investigated ranges of upsetting temperature and upsetting forces had an insignificant impact on the formation of residual stress.

Flaring volumes in the intermountain west region: A geospatial analysis of satellite and operator-reported data with viable mitigation strategies

Burning associated gas has been a prevailing problem across the world for decades. This practice consumes billions of (US) dollars' worth of valuable natural gas, contributes billions of metric tons of carbon dioxide (CO2) to the atmosphere, and releases volatile chemicals to nearby communities. To assess the prevalence of wellbore flaring within the Intermountain West (I-West) region, we analyzed data from the Nightfire project and contrasted it with wellbore surface hole locations. Consequently, we will permit the analysis of the flare data on a geospatial scale and compare it with operator self-reported flaring volumes. Through this analysis, we found that New Mexico is by far the largest flaring state in the I-West region, with most of its flare gas coming from the Permian Basin. Additionally, we found that satellite data estimated volumes that were 165% larger than those self-reported by the operators. Although some of this could be an overestimation from the Nightfire project, the size of the discrepancy indicates that there may be an underestimation of flared volumes that operators report to the state. A better understanding of the discrepancy source can be identified by linking the satellite flare volume to individual wells and operators, and potential solutions may be implemented to assist New Mexico's recent waste laws in reducing Permian flared volumes. We also proposed economic solutions that could substantially reduce the flared volume through flare gas utilization through on-site processing, the construction of small spur lines, and the development of a local sink for methane.

STRESS-STRAIN STATE SIMULATION OF AN UNDERGROUND LIQUEFIED NATURAL GAS PIPELINE

In recent years, there has been a steady development of systems for the production of small-scale liquefied natural gas for gas supply to remote consumers in cases where the possibilities of pipeline construction are limited. In addition, there is a tendency to use liquefied gas to replace liquid hydrocarbon fuels (gasoline, kerosene, gasoil, fuel oil). Due to the growth and emergence of new industries for liquefied natural gas consumption, the infrastructure necessary for its production, transportation and storage is being developed. 
 The article presents an analysis of the use of the most common polymers for the pipeline construction in the oil and gas industry. The possibility of using ultra-high molecular weight polyethylene for the construction of process lines for pumping cryogenic liquids was considered. The results of experimental studies on tensile strength test and Charpy impact strength test after exposure to liquid nitrogen are presented. As a result of tensile strength tests, an increase in the strength properties of the material was observed while maintaining its plasticity. The breaking stress was 37.7 MPa, the yield strength was 27.1 MPa at liquid nitrogen temperature, while at ambient temperature, the specimen failed at 26.9 MPa, the yield strength was 20.2 MPa. The specimens, tested for impact strength by the Charpy method, after exposure for 2 h in liquid nitrogen, a certain margin of plastic properties was also showed. The stress-strain state of a liquefied natural gas pipeline made of ultra-high molecular weight polyethylene in an insulating coating was simulated using the ANSYS Mechanical software package, taking into account its thermal interaction with the soil. The maximum equivalent stress in the model was 14.4 MPa, with calculated value of 12.7 MPa, which does not exceed the yield point of the material. Thus, ultra-high molecular weight polyethylene can be considered as a promising material for use at cryogenic temperatures.