Pipeline Condition Research Articles

IMPLEMENTATION OF A MATHEMATICAL MODEL OF NONSTATIONARY GAS MOVEMENT IN A COMPLEX PIPELINE UNDER MIXED BOUNDARY CONDITIONS

The study of the movement of real fluid is necessary in the design of not only gas and oil pipelines, but also other hydraulic machines. Mathematical models of the unsteady movement of a liquid or gas are also necessary when solving a number of prob-lems in the operation of pipeline systems. Such tasks can be: pipeline condition monitoring, operating modes optimizing, emergency situations analyzing and others. Attempts to model the dynamics of pressure in pipelines with selection or pumping at given points led to systems of partial differential equations with boundary conditions between the zones of the pipeline section in question. If there are n sampling points (swapping), then we have to solve a system of n + 1 equations. This is due to cumbersome calculations, and sometimes with insurmountable difficulties. Use of the impulse function by Dirac M.A. Huseynzade and his students in oilfield mechanics and in pipe hydraulics made it possible to describe non-stationary processes in complex pipeline systems using a single equation. A section of a pipeline system is usually called «complex» if there are sampling-pumping points, pumping station or different sections of the pipeline have different coefficients of hydraulic resistance or diameters. This article discusses the horizontal section of the pipeline with sampling and pumping points. The problem is solved under mixed boundary conditions using a finite Fourier sine transform. Graphs of pressure dynamics for cases of selection, pumping and without them have been constructed. Special cases are considered. Calculation formulas convenient for practical application are obtained.

POLYETHYLENE GAS PIPELINES: PRACTICAL POSSIBILITIES TECHNICAL DIAGNOSTICS

Technical diagnostics of in-service polyethylene-exhaust gas pipelines face a number of difficulties, since the existing methods of destructive control are not applicable for determining the mechanical and physical characteristics-stick of polyethylene pipes. The search for effective control methods that can most fully characterize the quality of pipe material and the interpretation of the results obtained are of scientific and practical interest. The article on the example of technical diagnostics of the polyethylene gas pipeline built in 1985 considers possible criteria for assessing the condition of pipes and their ranking by significance. It was found that polyethylene pipes produced during the development of their production did not always meet mandatory quality requirements and could have hidden defects in the form of inhomogeneities, cavities and cracks throughout the volume of pipe material. Based on the experimental studies carried out, it was shown that the pipe material during underground operation does not undergo significant changes in its initial characteristics. At the same time, it was noted that the pipe grades of polyethylene raw materials of the first generation had low resistance to slow crack growth, therefore, the presence of internal defects in the pipe material in owning value with the effect of concentrated loads can lead to premature loss of containment. The work carried out confirmed the possibility of a quantitative design assessment of the technical condition of the gas pipeline based on the results of destructive tests of pipes for long-term hydrostatic strength. The experimental data presented in the article are of interest to specialists who are faced with the need for expert assessment of the state of the pipes of the operated polyethylene gas wires and forecasting their service life.

METHODS, MEANS AND TECHNOLOGY OF VIBRATION DIAGNOSTICS OF MAIN GAS PIPELINES SUBJECT TO STRESS CORROSION CRACKING

Computational and experimental methods, tools and technology for monitoring the technical condition of main gas pipelines during their underground laying according to the parameters of technological and geodynamic vibrations are proposed. To identify potentially hazardous (risk-sensitive) sections of main gas pipelines, the parameters characterizing the microseismic field directly above the gas pipeline routes, the energy forms of natural acoustic vibrations of the natural gas column of the gas pipeline section, the natural frequencies of the pipe of the gas pipeline section as a beam/shell and the soil containing it are used. The results obtained make it possible to reduce operating costs.

Process Pipeline Strength Calculation Methodology Enhancement Using Finite-Element Method

The paper analyzes possible approaches to the technical evaluation of the process pipelines according to the diagnostic results using strength calculation based on the finite-element method. Process pipelines have a complex dimensional configuration and a complex stress–strain state, so traditional approaches to technical diagnostics and assessment of the technical condition of main pipelines are not applicable. Qualities of the process pipelines as objects bring relevance to the development of the practical approaches to its numerical modeling and formalization of boundary and loading conditions when using software systems based on the finite-element method. This paper presents the results of experimental studies of the stress–strain state of a number of test benches simulating elements of pipeline structures. Therefore, analytical research is presented that allows recommendations to be formulated for the numerical modeling of the process pipelines. The formulated recommendations allow us to correctly simulate process pipelines when calculating their stress–strain state using the finite-element method to model the conditions of fastening and loading, thereby ensuring high accuracy of the assessment of the technical condition of structures based on the results of their diagnostics.

Enhanced predictive method for pipeline strain demand subject to permanent ground displacements with internal pressure & temperature: a finite difference approach

Pipelines subject to ground deformations generated by geohazard loads carry high importance on pipeline analysis, design, and assessment due to risk of structural damage or failure. Additionally, internal pressure and temperature variation within an operating pipe induce additional strains in combination with pipe strains generated by ground displacement. In this study, an enhanced predictive method is proposed founded upon methods employed by Zheng et al. (2022) to assess pipeline behaviour subject to permanent ground displacement, while considering effects of internal operating pressure and temperature variation. The finite difference-based method previously proposed for strain analysis of buried steel pipes subject to ground movement ignores the effects of internal pressure and/or temperature loading, limiting the applicability of this approach to exclude the operating conditions of pipelines. To address this limitation, the proposed enhanced method accounts for the initial thermal strains and biaxial stress state in the pipe due to hoop stress generated by internal pressure. These additional strains are considered within the expressions of internal axial force and bending moment, derived based on the actual stress distribution on the pipe cross-section. The accuracy of the proposed method is validated against the finite element method (FEM) with respect to results of strain and deformation demand using several indicative case studies. This research provides an effective method of incorporating temperature and internal pressure loads of pipelines subject to permanent ground displacements of varying types, magnitudes, and directions.

Predicting the performance of existing pre-cast concrete pipes using destructive and non-destructive testing techniques

One of the most significant and critical urban assets for a sustainable community is the sewer pipeline network and water distribution system. Water sewer networks and distribution systems have a definite service life span to provide continuous facilities to end users. Therefore, it is pertinent to continuously evaluate the condition of water and sewer concrete pipelines to ensure the reliable, sustainable, and cost-efficient transport of water and sewerage for the safety of society. The condition assessment is commonly carried out by visual observations followed by some non-destructive testing methods. However, it is the need of the hour to shift assessment methods to advance assessment techniques to save time and money for our community. Currently, in this project, the condition assessment of pre-cast concrete pipes was carried out by destructive and non-destructive methods. Different test trials i.e., ultra-sonic pulse velocity, Schmidt hammer also known as rebound hammer test, visual inspection, three edge bearing test, and core cutting test on the old buried and new concrete pipes were performed. It was observed that concrete used for the construction of existing precast concrete pipes still has better quality indices after 20 years as compared to that of concrete of new pipes. However, steel has deteriorated with time and clear corrosion of steel was identified in existing pre-cast concrete pipes. At the same time, it was observed that there should be an automated mechanism to continuously asses the condition of pre-cast existing pipes which will address the sustainable development goals (SDG 6, 9, 11). Consequently, it can be said that condition assessment of pre-cast concrete pipes will lead to sustainable societies and infrastructure.

Evaluation of Hydrogen Blend Stability in Low-Pressure Gas Distribution

Natural gas distribution companies are developing ambitious plans to decarbonize the services that they provide in an affordable manner and are accelerating plans for the strategic integration of renewable natural gas and the blending of green hydrogen produced by electrolysis, powered with renewable electricity being developed from large new commitments by states such as New York and Massachusetts. The demonstration and deployment of hydrogen blending have been proposed broadly at 20% of hydrogen by volume. The safe distribution of hydrogen blends in existing networks requires hydrogen blends to exhibit similar behavior as current supplies, which are also mixtures of several hydrocarbons and inert gases. There has been limited research on the properties of blended hydrogen in low-pressure natural gas distribution systems. Current natural gas mixtures are known to be sufficiently stable in terms of a lack of chemical reaction between constituents and to remain homogeneous through compression and distribution. Homogeneous mixtures are required, both to ensure safe operation of customer-owned equipment and for safety operations, such as leak detection. To evaluate the stability of mixtures of hydrogen and natural gas, National Grid experimentally tested a simulated distribution natural gas pipeline with blends containing hydrogen at up to 50% by volume. The pipeline was outfitted with ports to extract samples from the top and bottom of the pipe at intervals of 20 feet. Samples were analyzed for composition, and the effectiveness of odorant was also evaluated. The new results conclusively demonstrate that hydrogen gas mixtures do not significantly separate or react under typical distribution pipeline conditions and gas velocity profiles. In addition, the odorant retained its integrity in the blended gas during the experiments and demonstrated that it remains an effective method of leak detection.

Pipeline condition assessment and finite element modeling of mechano-electrochemical interaction between corrosion defects with varied orientations on pipelines

Multiple corrosion defects located in varied orientations are common on pipelines, significantly impacting pipeline conditions. In this work, 3D finite element (FE) based multi-physics field coupling models were developed to model mechano-electrochemical (M−E) interaction between corrosion defects with varied orientations and its effect on pipeline conditions. The effects of the parameters, including defect geometries, operating conditions, and the relative positions and spacings between the defects, were determined. The results demonstrated that, the strongest M−E interaction occurred between defects when the longitudinal or circumferential spacing is 0, causing high-level local stress concentration and the anodic current density (i.e., corrosion rate) at the corrosion defects. As the defects gradually overlapped or separated from each other on the pipe surface, the magnitude of the M−E interaction decreased. The interaction between defects even disappeared when the longitudinal or circumferential spacing between defects reached 96 mm or 72 mm, respectively, and the defects can be assessed separately. An increased internal pressure led to local plasticity deformation and anodic current density concentration occurring at the inner edge of the defects and defect adjacent area. For example, the maximum anodic current density increased by 56.4% when the internal pressure increased from 12 MPa to 17 MPa. It was also observed that M−E interaction between defects disappeared if the defects were shorter than 48 mm or shallower than 8 mm. Sensitivity analysis demonstrated that the degree of M−E interaction was most sensitive to circumferential spacing, followed by defect depth, defect length, longitudinal spacing, and internal pressure.

Odorous Substances in Urban Drainage Pipelines and the Removal Technology: A Review

The existence of odors in drainage pipelines is one of the most prominent environmental problems that urban residents complain about nowadays. Odorous substances in sewage can cause corrosion and erosion in drainage pipelines, and even lead to great harm to the human body and environments. Ideas for in situ odor control can be divided into two main categories: the elimination of odorous substances and the inhibition of the production of odorous substances. However, there is a lack of comprehensive summary of in situ overall deodorization techniques, which has limited the wide application of these methods. We conducted a systematic review to summarize recent advances in in situ overall deodorization. Firstly, the main odorous substances in drainage pipelines and their basic characteristics are concluded. Special attention has been paid to volatile sulfur compounds (VSCs) and nitrogen-containing compounds, as the main odorous substances. Subsequently, typical sources of these odorous substances are summarized based on their formation mechanisms. Then, in situ deodorization techniques (including pipeline condition optimization techniques, odor source control techniques, chemical control techniques, and biological control techniques) are introduced. Finally, upcoming research efforts on deodorization mechanism improvement, research gap supplementation, and economic efficiency enhancement to meet practical conditions are proposed.

Data-Driven Urban Gas Pipeline Integrity Detection and Evaluation Technology System

At present, PE pipelines are widely used in urban gas pipeline networks. As pipeline safety is of great importance to the gas supply, this paper focuses on the safety and reliability of PE pipes during service. First of all, this paper analyzes the aging factors of PE materials and the failure forms and mechanisms of PE pipes. Second, the performance testing methods of PE pipelines are summarized, including pipeline pressure tests, pipeline condition inspections, welded joint inspections, mechanical performance tests, and physical performance tests. In addition, life prediction methods for PE pipelines are introduced and analyzed. The methods and applicability of tensile experiments and DSC experiments based on thermal oxygen aging are both analyzed, and the corresponding experiments are also carried out. On the basis of the above research, the technical system of the integrity detection and evaluation of urban gas pipelines is finally established. The system includes the integrity detection method of urban gas pipelines and the applicability evaluation and determination of retest cycles, which can provide a reference for the safe operation of urban gas pipeline networks.

The mechanism of inhibitive effect on hydrogen permeation of X70 steel by lanthanum microalloying: Enhanced kinetics of desorption

In this work, electrochemical hydrogen permeation tests were carried out to obtain the steady-state hydrogen permeation current of X70 pipeline steel in acid environment and alkaline electrolyte with applied cathodic overpotentials simulating the service conditions of pipelines. It is shown that La-microalloying can efficiently reduce the steady-state hydrogen permeation current density while maintaining the same mechanical performance. The experimental permeation data were fitted with Iyer-Pickering-Zamanzadeh (IPZ) and surface effect model to analyze the inhibitive mechanism on hydrogen permeation, and the results depicted that La element on the material surface greatly facilitates the desorption process of hydrogen atoms. In addition, the calculated hydrogen diffusion coefficient was found smaller after La microalloyed, which can be ascribed to the larger hydrogen trap density. It is suggested that La-microalloying can mitigate hydrogen damage of X70 pipeline steel in both acidic environment or under cathodic protection.

Progress in Drainage Pipeline Condition Assessment and Deterioration Prediction Models

The condition of drainage pipes greatly affects the urban environment and human health. However, it is difficult to carry out economical and efficient pipeline investigation and evaluation due to the location and structure of drainage pipes. Herein, the four most-commonly used drainage pipeline evaluation standards have been synthesized and analyzed to summarize the deterioration and breakage patterns of drainage pipes. The common pipe breakage patterns are also summarized by integrating the literature and engineering experience. To systematically describe the condition of drainage pipes, a system of influencing factors for the condition of pipes, including physical, environmental, and operational factors, has been established, and the mechanism of action of each influencing factor has been summarized. Physical, statistical, and AI models and their corresponding representative models have been categorized, and the research progress of current mainstream drainage-pipe deterioration and breakage prediction models are reviewed in terms of their principles and progress in their application.

The concept of a system for monitoring the condition of gas transmission pipelines and their surroundings

Uwarunkowania ekologiczne, ale także polityczne, a w ostatnim czasie również ekonomiczne związane z galopującym wzrostem cen surowców energetycznych, jak i samej energii, stały się powodem silnie rosnącego zainteresowania zarówno wydajnymi źródłami energii, jak też „czystymi” paliwami, w tym wodorem. Wprowadzenie wodoru do powszechnego użytku w transporcie i energetyce wiąże się jednak z szeregiem problemów natury technicznej, często rozwiązanych w skali laboratoryjnej, jednak ciągle oczekujących na wdrożenia. Katalog zagadnień związanych z wykorzystaniem wodoru jako paliwa do powszechnego użytku jest bardzo długi, jednak w niniejszej pracy skupiamy się na przybliżeniu problematyki dotyczącej przechowywania wodoru. Jako istotne omówione są kwestie metod sprężania, skraplania i lokalnego wytwarzania wodoru, a także przechowywania go i transportu w postaci związków chemicznych o różnej budowie. Pośród omówionych związków znalazły się między innymi wodorki metali o wysokiej aktywności chemicznej, borowodorek sodowy, amidoborany. Jako osobna grupa organicznych nośników wodoru mogą być rozpatrywane związki takie jak kwas mrówkowy, toluen, naftalen, a także inne mogące ulegać odwracalnemu uwodornieniu, jak pary aren–cykloalkan. Naświetlone zostały także problemy technologiczne związane z wykorzystaniem wspomnianych związków w przechowywaniu i transporcie wodoru. Istotną kwestię stanowią także metody wielkoskalowego magazynowania tego gazu, dlatego też w artykule zasygnalizowane zostały zagadnienia dotyczące problematyki podziemnych magazynów gazu (PMG) wykorzystywanych do magazynowania wodoru czy wreszcie – magazynowania go w istniejącej infrastrukturze przesyłowej. Ponadto przybliżony został zarys najistotniejszych uwarunkowań prawnych oraz strategii dotyczących wodoru, zarówno w skali kraju, jak i wspólnoty europejskiej.

Gas Pipeline Leakage Detection Method Based on IUPLCD and GS-TBSVM

To improve the identification accuracy of gas pipeline leakage and reduce the false alarm rate, a pipeline leakage detection method based on improved uniform-phase local characteristic-scale decomposition (IUPLCD) and grid search algorithm-optimized twin-bounded support vector machine (GS-TBSVM) was proposed. First, the signal was decomposed into several intrinsic scale components (ISC) by the UPLCD algorithm. Then, the signal reconstruction process of UPLCD was optimized and improved according to the energy and standard deviation of the amplitude of each ISC, the ISC components dominated by the signal were selected for signal reconstruction, and the denoised signal was obtained. Finally, the TBSVM was optimized using a grid search algorithm, and a GS-TBSVM model for pipeline leakage identification was constructed. The input of the GS-TBSVM model was the data processed by the IUPLCD algorithm, and the output was the real-time working conditions of the gas pipeline. The experimental results show that IUPLCD can effectively filter the noise in the signal and GS-TBSVM can accurately judge the working conditions of the gas pipeline, with a maximum identification accuracy of 98.4%.

A hybrid flow energy harvester using combined piezoelectric and electromagnetic transductions for pipeline network monitoring

An energy harvester that employs both electromagnetic and piezoelectric effects to convert fluid flow energy in the pipeline into electrical energy for powering wireless sensor nodes (WSNs) of the pipeline condition monitoring system has been developed. The devised hybrid energy harvester comprised a unimorph circular piezoelectric plate fixed in a T-joint, three stacked magnets attached at the middle of the piezoelectric plate, and an adjustable coil holder holding a wound coil. Experimental results of the developed prototype depict that it can produce a maximum load RMS voltage of 3.36 V with the piezoelectric part at 27 kΩ of optimal load resistance and 286 mV from the electromagnetic part at 335 Ω of optimum load resistance. Moreover, at 2.9 kPa flow pressure amplitude and 11.08 l/s flow rate, a maximum load power of 418 µW from the piezoelectric portion and 244 µW with the electromagnetic portion is produced. Upon integrating the harvester with a rectifier circuit, an open circuit DC voltage of 9.4 and 3.32 V are generated with piezoelectric and electromagnetic parts, respectively. Furthermore, under the same fluid flow condition, the piezoelectric part produces 404 µW DC power at 92 kΩ of optimum load resistance, while the electromagnetic portion produces 163 µW DC power at 10 kΩ of optimum load resistance. The developed harvester is also utilized to recharge a 4.8 V power bank from 1.11 to 4.2 V in 210 min. Moreover, it is also integrated with a pipeline condition monitoring system to power a WSN, a controller, and relevant circuitry.

Multiclass Weighted Least Squares Twin Bounded Support Vector Machine for Intelligent Water Leakage Diagnosis

Monitoring the operating status of the pipeline and determining the location of the leak in time are very important to ensure the safe operation of the pipeline. Least squares twin support vector machine (LSTSVM) is a classic fast classification method, which has been used to identify different pipeline conditions. However, LSTSVM assumes that all samples share the same weight when generating the hyperplane, including data points that may be polluted in the sample (i.e., outliers), and outlier samples with equal weights will mislead the generation of the hyperplane. Inspired by the above research, this paper proposes a weighted least squares twin bounded support vector machine based on Gaussian mixture models (GMM), referred to as G-WLSTSVM. The proposed G-WLSTSVM introduces a weight matrix for the objective function through GMM, and assigns a larger weight to the normal samples and a smaller weight to the outliers, which reduces the impact effect of the outliers on the generation of the classification hyperplane. Furthermore, since LSTSVM only considers the empirical risk minimization principle, it may lead to overfitting. The proposed G-WLSTSVM introduces an extra regularization term based on the margin maximization idea to realize the principle of structural risk minimization, which improves the generalization performance of the model. Finally, since the practical problems are mostly multi-classification problems, the G-WLSTSVM for binary classification cannot be satisfied. Therefore, the proposed G-WLSTSVM combined with a "One-versus-One" strategy is extended to handle multi-classification problems, namely the multi-class G-WLSTSVM. We evaluate the effectiveness of the multi-class G-WLSTSVM in identifying different pipeline conditions and localize the identified leakage. Numerical experimental results on several UCI datasets further demonstrate that compared with other related methods, the proposed G-WLSTSVM not only retains the advantages of simplicity and speed of the LSTSVM, but also improves the classification accuracy and generalization ability. The code for this article is available at https://github.com/cmq-456/glstsvm.

TECHNOLOGICAL EQUIPMENT FOR PERFORMING SELECTIVE CAPITAL REPAIR OF PIPELINES

The article provides an analysis of the technical condition of main pipelines and technologies for performing selective overhaul of their linear part. Known technological schemes for performing selective repair of pipelines do not provide for effective soil compaction after its completion due to the lack of technical means for effective and uniform soil compaction. The lack of compaction of the soil under the repaired pipeline leads to its uncontrolled subsidence relative to the line of original laying, which can cause an emergency situation. In order to ensure high-quality, fast and safe execution of the entire complex of earthworks during the selective overhaul of main pipelines with one excavator, a research and industrial universal set of interchangeable work equipment for a single-bucket crawler excavator weighing 20 tons has been designed, manufactured and tested. The set of replacement equipment consists of digging equipment, compaction equipment, a bucket for performing earthworks during the opening of the pipeline and filling the soil in the trench, a universal grip for attaching the replacement equipment to the handle of a single-bucket excavator, a system for positioning and monitoring the position of the replacement equipment relative to the pipe. Technology for implementation of earth-moving works at capital repair of linear portion of main pipelines and complex of technological equipment for its realization are patented in Ukraine. The productivity of digging equipment is 35...55 m3/h, the productivity of compacting equipment is 35...45 m/h. The use of a set of equipment allows one excavator to perform the entire complex of earthworks during the selective capital repair of main gas pipelines with a diameter of 530...1420 mm.

The efficiency of using ductile iron water pipes in soft soil

At the present stage of reforming the housing and public services, toughening the requirements for the life and reliability of pipelines of the municipal life support systems, the issues of developing the requirements for choosing the material and type of pipes in relation to specific operating conditions of urban water supply systems become very relevant. The reliability and safety of the public water supply have been the main requirements applicable to these systems as the most important components of public health and one of the main priorities of the state social policy [1,2]. Of great importance in providing for the reliability of water pipelines is the expert choice of the pipe material. The paper states that for many years the main pipe materials used in the public water supply of Russian cities have been steel and cast iron. In recent years, ductile iron pipes widely used abroad and in Russia, in particular in the Moscow water supply system, have been competing with steel pipes (among metal ones). The paper presents the information on the condition of the water pipelines in the Russian cities, on the characteristics of ductile iron pipes and their use in soft and subsiding soils.

RISK-INFORMED METHOD FOR QUALIFYING STRATEGIES FOR OPERATION CONTROL OF METAL OF SAFETY RELATED SYSTEMS OF NUCLEAR POWER PLANTS

The optimization of strategies for organizing operation control of metal of equipment and pipelines of safety related systems of nuclear power plants is a pressing issue in ensuring the operation safety and efficiency of nuclear power plants with VVERs. An analysis of regulatory and operational documentation, as well as well-known scientific developments, showed that the optimizing strategies for operation control of metal of safety related systems have not been sufficiently studied. Known strategies for organizing and planning operation control of metal of safety related systems do not take into account many years of experience in operating nuclear power plants with VVER (about 1000 reactor-years), the results of annual monitoring of the technical condition and reliability of equipment and pipelines of safety related systems (including continuous metal monitoring systems), as well as the influence of individual systems on the safety indicators of nuclear power plants and other relevant factors of reliable and safe operation. A risk-informed method has been developed for qualifying modernizations and optimizing strategies for organizing operation control of metal of safety related systems of nuclear power plants. The method is based on an analysis of the results of monitoring metal integrity of equipment and systems, as well as the probability of destruction (failure) of equipment and/or pipelines of safety related systems. Based on the developed risk-informed method for qualifying optimization of the strategy for organizing metal monitoring, the possibility to reduce the control frequency and scope for metal of the emergency feedwater pipeline of steam generators of nuclear power plants with VVER-1000 is substantiated. Further directions for the development of the practical application of the risk-informed method presented in this paper for the calculation qualification of strategies for operation control of metal of safety related systems of nuclear power plants can be related to experimental qualification of the method, as well as the improvement of deterministic methods for modelling processes of degradation/destruction of metal structures in transitional/emergency operating modes of nuclear power plants.

Instrumental inspection of pressure pipelines of the Amuzang-2 pumping station

This article discusses the main results of the field studies conducted to assess the technical condition of the pressure pipelines of the Amuzang-2 pumping station. The research aims to check the stress-strain state of the pipeline material, which occurs during long-term operation under conditions of corrosive and abrasive wear of the shell. The research objectives were as follows: measuring the thickness of the shell of pressure pipelines of the pumping station; verification calculation of the strength of pumping station pipelines. During the research, the method of carrying out full-scale measurements using an ultrasonic device to determine the thickness of the pipeline shell and the method of calculating the stress-strain state of the pipeline material that occurs during long-term operation under conditions of corrosive and abrasive wear of the shell were used. The verification calculation was carried out for the strength of the shell material and the stability of the shape of its section: from the action of external pressure (vacuum in the pipeline), buckling, like a rod, under the action of internal pressure. According to the studies carried out, the pipelines can withstand the maximum vacuum, and the static buckling strength of the pipelines is ensured.