Large-sized Equipment Research Articles

ПРИМЕНЕНИЕ ИНСТРУМЕНТОВ ПРЕДИКТИВНОЙ АНАЛИТИКИ ДЛЯ ПРОГНОЗА ВОССТАНОВЛЕНИЯ КРУПНОГАБАРИТНОГО ОБОРУДОВАНИЯ

The article presents the results of a study in the field of predictive analytics for the repair of largesized equipment in the building materials industry. New data processing techniques and the use of artificial intelligence,especially machine learning, can improve the prediction of the future state of equipment. The stages of predictive analytics application are presented, the possibility of predicting the residual resource is described and the effective use of predictive analytics is demonstrated using the example of restoring the trunnion of a ball mill. The data obtained are analyzed, on the basis of which it is concluded that repair work is necessary to increase the inter-repair life of the equipment and reduce economic losses. In conclusion, the validity of the use of predictive analytics for the repair of large-sized equipment and making optimal decisions is emphasized. The use of predictive analytics makes it possible to increase the efficiency of repair of large-sized equipment by increasing the repair life, reducing the number of downtime and preventing unplanned breakdowns. This approach is a promising and practical solution for enterprises in the building materials industry.

Crashworthiness performance and optimization of multi-cell aluminum tubes under axial loading

Multi-cell thin-walled tubes have been proven to be an efficient energy absorber with well-controlled deformation stability and high energy absorption capability. Nevertheless, research on multi-cell tube energy absorbing structures mainly focused on the fields of small size and light energy absorption. The high cost and low crushing force significantly restrict their applications in practical engineering, especially for large-size equipment, such as train crashworthiness protection. To address this limitation, this paper presents a novel multi-cell tube energy absorption structure made of aluminum alloy for ultra-large energy absorption field with features of low cost (extrusion and welding processing), large size (450 mm × 280 mm × 280 mm), light weight (∼9 kg), high energy absorption capacity (>200 kJ) and large crushing force (>600 kN). The proposed multi-cell structure is composed of four extruded square tubes connected by welding. To demonstrate the feasibility of the proposed structure, the sample is fabricated and dynamic impact test is performed. Experimental results show that the tube buckles progressively and forms plastic folding lobes with a total absorbed energy of 235.6 kJ and a mean impact force of 668.7 kN, which are about 500% higher than that of previous reported multi-cell structures. Finite element simulation and theoretical model are developed and well-capture the experimental deformation process. The relative errors of theoretical and simulation mean crushing force, Effective crushing distance coefficient, energy absorption and maximum crushing distance in comparison experimental results are all within 10%. Based on the validated finite element model, the effect of geometrical parameters of the proposed structure on its crashworthiness performance is analyzed. Finally, we construct the response surface models of the multi-cell tube and optimize the absorbed energy under a mass constraint by Multi-objective Non-dominated Sorting Genetic Algorithm (NSGA-II). The Pareto front of structure energy absorption and mass is obtained. In particular, under the constraint of total mass M = 9 kg, the optimal solution with maxing energy absorption is t = 4.999 mm, α = 0.342 mm, and w = 281.5 mm. The proposed structure can be applied to ultra-large energy absorption fields such as train crashworthiness protection.

Минимизация опасности металлизированных шахтных стоков

Increase in ore production volumes and the use of large-sized equipment contribute to the loss of ores during mining, which gives rise to the phenomenon of natural leaching. On the example of deposits of the Sadon ore cluster, the hazard of metallized mine effluents for living matter and humans is shown. Of the relatively young methods of mine water purification, the most promising is the combination of electrochemical softening of mine effluents with electrodialysis desalination and concentration. The improvement of environmental protection technologies is developing on the basis of the managed disposal of mining and processing waste as a generator of natural leaching. The results are presented related to the experimental study of the parameters of metals extraction from the mine effluents by electrodialysis desalination with simultaneous concentration. The mechanism is formulated related to the development of oxidative processes of sulfide minerals in the presence of carbon dioxide of the mine atmosphere with the occurrence of electrochemical bonds between the crystals and mineral grains. The process of electromembrane treatment of metal-containing wastes is detailed. It is shown that during the electrochemical decomposition of salt systems, associated commercial products are formed. The dynamics of pollution of the Ardon river washing the Sadon deposit is given. The chemical processes of leaching of lost ores are described. An installation for electrochemical wastewater treatment is recommended, and a quantitative assessment of its efficiency is given. It is noted that the processes of electrochemical wastewater treatment are adequate, described by linear graphs and subject to correction. It is shown that the drains of mines are hazardous for living matter. It is indicated that the improvement of environmental protection technologies will be developed in the direction of waste disposal of mining and processing. The general principle of mine water hazard reduction is a combination of electrochemical softening with electrodialysis desalination and concentration.

ГЕОДЕЗІЯ, КАРТОГРАФІЯ І АЕРОФОТОЗНІМАННЯ

The developments of the scientific and pedagogical staff of the Department of Engineering Geodesy of the Lviv Polytechnic National University in the direction of increasing the accuracy of geodetic measurements in the construction, operation and repair of unique buildings, structures or separate technological equipment, which is particularly important for their safe operation, are considered. Auxiliary equipment (improved light-reflecting mark, device for linear-angular measurements, spherical reflector with a stand, two-prism transducer-vector) has been developed to increase the accuracy of measurements of parameters of engineering structures by electronic total stations. On the basis of theoretical calculations, an optimal image of the geodetic mark for viewing at different distances is proposed, and a three-dimensional holder is developed to compensate for the non-perpendicular error. A technique was developed and implemented in a device for linear-angular measurements, which made it possible to determine the length of segments from 1 to 30 meters with an accuracy of 0.1-0.3 mm. In order to transfer the coordinates of the geodetic base from the reference network to the measurement points of building structures, a spherical reflector and a stand were developed, in the process of using which errors in centering, reduction and height measurement are compensated. The application of the developed spherical reflector was tested during the restoration of the design position of the large-sized equipment of the power complex facility with an accuracy of 0.5 mm. To determine the dimensions of irregularly shaped structures in order to minimize the angles of the prism (to directly determine the coordinates of the prism tip), a two-prism encoder vector was theoretically justified and developed. The accuracy of determining the spatial coordinates by the vector encoder was investigated using the final measure as a reference value. According to the results of research, the deviation of the distances determined with the help of the vector transducer from the reference value is 0.3 mm.

Simulation of the process of milling and grinding cylindrical surfaces by an oriented tool in one setup

Purpose. Improvement of schemes for processing the cylindrical surfaces of the shafts of gearboxes and transmissions of large-sized equipment. Development of modular spatial models of the processes of milling and grinding of the cylindrical surfaces of the shafts of gearboxes and transmissions of military and civil vehicles. Development of a model for dressing a grinding wheel with a diamond tool. Methodology. Creation of general and particular modular mathematical models of the processes of removal of allowance and shaping during rough and finish milling and finishing grinding of non-rigid cylindrical surfaces was carried out using a matrix apparatus for transforming coordinate systems. This made it possible to describe the treatment process using standard matrices. The calculations were carried out in the mathematical package Mathcad. To obtain a graphic display of the mathematical model of the instrumental and machined surfaces, the standard functions of the software package and the developed logical blocks were used. Findings. A technique for processing cylindrical surfaces of revolution with an oriented tool is proposed. Roughing, finishing and polishing are carried out in one setup. Roughing and finishing are carried out with an oriented cutter with replaceable multifaceted carbide inserts. The angle of orientation of the cutter is selected from the condition of maximum loading of the end section. Thus, the roughing stock is removed by the end face and by the finishing periphery, while the maximum component of the cutting force is directed along the axis of the part and does not cause deformations in the radial direction. Final finishing is carried out with a wide grinding wheel. The angle of orientation of the grinding wheel is selected from the condition of uniform distribution of the allowance along the periphery. A scheme for dressing the working surface of a grinding wheel with a diamond pencil with a constant feed is proposed. Originality. Modular spatial models of the processes of milling and grinding of the cylindrical surfaces of the shafts of gearboxes and transmissions of military and civil vehicles were developed. A model for dressing a grinding wheel is proposed. The use of the proposed models makes it possible to conduct a more detailed analysis of the processes of stock removal and shaping. Practical value. Dependencies are proposed for choosing the optimal angles of orientation of the cutter for roughing and finishing milling and the grinding wheel for finishing. The accuracy of parts is increased due to the elimination of the resetting error. The cost of manufacturing is reduced due to the maximum full use of cutting carbide inserts, by turning them and operating the worn finishing edge in the rough milling mode, as well as by increasing the resource of the grinding wheel.

Cultivation of annual apple seedlings according to compacted planting schemes in greenhouses of different volumes

The article is devoted to the production of seedlings of fruit plants in the North-West of the Russian Federation. A compacted planting scheme is considered when cultivating plants in greenhouses of 50?10?5 m and 50?4?2.5 m of different volumes. In the studies, winter vaccination was used by the method of improved copulation. When planting plants in greenhouses, a single-line (40?15 cm) and three-line (20+20+40?15 cm) planting scheme was used. The influence of the microclimate developing in the protected soil on the parameters of growth and development of seedlings was studied. The assessment of microclimate regulation in film unheated greenhouses of different volumes is given. It is revealed that small-sized greenhouses, due to low buffering and, in connection with this, difficulties with regulating the microclimate, reduce the growth of seedlings in height and give a lower percentage of the output of standard material per unit area. The mechanization of some production processes, where it is possible to use large-sized equipment, for example, soil preparation, delivery of peat or soil, also causes difficulties.

Diagnostics of Advanced Power Intensive Power Sources Based on the Acoustic Spectroscopy Method

Objective of this article is to develop a method for lithium chemical current sources diagnostics, which would ensure high reliability in assessing their technical state (primarily, the discharge degree) close to potentially achievable introduction of the acoustic spectroscopy method. Today, microcalorimetric studies and methods of impedance and noise spectroscopy make it possible to predict the lithium chemical current sources service life. However, implementation of the microcalorimetric studies result requires a lot of time accompanied by using stationary and large-size equipment, which is practically impossible in the autonomous conditions. Application of the impedance spectroscopy method provides satisfactory results only with high degrees of discharge. In the range of 0--30 %, it is very difficult to determine the discharge degree, since noticeable alteration in the correlate within its deviation from the mean value is missing. In this regard, it is proposed in order to provide diagnostics of the lithium chemical current sources in the region of initial degrees of discharge to introduce the noise diagnostics method. In order to increase reliability of the diagnostic estimates, it is advisable to use acoustic spectroscopy as a physically independent method in diagnosing the state of lithium chemical current sources. Results of the preliminary measurements analysis confirm the prospects of using the acoustic spectroscopy method in assessing the current state of primary lithium chemical current sources. Experimental studies of the lithium chemical current sources response to acoustic (mechanical) action made it possible to determine a set of parameters characterizing the proposed methodological approach. This provided a possibility to search for correlation dependences of the lithium chemical current sources spectral characteristics on the degree of their discharge. This makes it possible to use the method of acoustic spectroscopy in prompt and reliable diagnostics of the primary current sources in the region of low discharge degrees

Method for Calculating the Offner Compact-Size Spectrometer

Significant advances in development of the optical wavelength range require high-quality optical systems to create optoelectronic equipment on their basis characterized by high speed and information capacity. A method for calculating a compact-size Offner spectrometer was developed having the advantages of its compactness, maintaining high optical characteristics and having relatively low cost in comparison with the large-size equipment. The method is based on using the Rowland circles and the coma and astigmatism correction in the image plane. Analytical expressions were obtained making it possible to calculate design parameters of the spectrometer optical scheme. Two examples of calculating optical systems for visible and infrared ranges were considered. Calculated systems were simulated in the Zemax software program. To evaluate the synthesized optical models image quality, the confusion spot radius in the image plane was used. It is demonstrated that the confusion spot radius value does not exceed the value of the radiation receiver pixel size in the considered spectral ranges. Optimization was carried out for the IR spectrometer according to overall dimensions in order to improve the design manufacturability. It is shown that the principles laid down in the method development are effective, and the method itself could be used in design and development of new small-size hyperspectral optoelectronic equipment

Chemical Current Source Express Diagnostics Using Noise Spectroscopy on the Example of Lithium-Thionyl Chloride Battery

Lithium-thionyl chloride battery voltage is practically not changing during the discharge process and drops sharply being completely discharged. In this regard, the problem of non-destructive quality control of the chemical current sources (first of all, the discharge degree) before installation thereof in the equipment becomes of particular importance. Microcalorimetric studies make it possible to rather correctly determine the current source internal self-discharge rate, predict the LCCS shelf life and its performance term. However, the heat release absolute value in current sources with sufficient storability, i.e., with low self-discharge, is very small; therefore, it is necessary to use sensitive, stationary and large-sized equipment. This makes such diagnostics impossible when operating in the stand-alone conditions. The impedance spectroscopy method could be proposed to solve this problem. However, satisfactory results are only obtained in the 0--70 % residual capacitance range. Determination of residual capacitance in the 70--100 % range appears to be rather difficult due to the absence of noticeable alteration in the informative parameter within the limits of its absolute deviation from the mean value. In this regard, it looks advisable to use noise spectroscopy as a physically independent method in diagnosing the state of chemical current sources to expand the residual capacitance diagnostics range to the 70--100 % domain, as well as to increase reliability of the chemical current source diagnostic estimate in the range of 50--70 %. Results of the electrochemical noise measurement analysis confirm promising application of the noise spectroscopy method in estimating current state of the primary chemical current sources in their low discharge domains

Design and performance exploration of a cymbal piezoelectric energy harvester under the excitation of power transformer vibration

With the rapid application of internet of things technology and wireless sensor in transformer station, the demand for stable and reliable power source becoming increasingly stronger. Power transformer operates with high energy density vibration, which provides a suitable energy source for health monitoring sensors. A cymbal piezoelectric transducer is designed to harvest the energy of vibrationwhich is made of cymbal end cap and piezoelectric ceramic to convert mechanical energy to electricity. Also, the power circuit is designed to realize the transmission and storage of electric energy. Then, the performance of the cymbal piezoelectric energy harvester is explored by FEM and experiment. The influence of mechanical vibration characteristics on the charging power of piezoelectric transducer is studied, including amplitude, frequency and preload. The experimental results show that the cymbal piezoelectric energy harvester can provides stable and reliable power, which allows the possibility of large-scale application of wireless sensor in transformer station. The present work provides a new design concept for developing the novel cymbal harvesters used in large-sized vibratory equipment, such as power transformer, to harvest vibration energy.

ТОЧНОСТЬ ОБРАБОТКИ ОТВЕРСТИЙ КОМБИНИРОВАННЫМ ИНСТРУМЕНТОМ

Cement, powder metallurgy and various large-sized equipment are used in the industry of building materials for grinding raw materials. During operation, such equipment is exposed to external influences, especially at the joints, which reduce the reliability of the units. This leads to the early replacement of wearing parts. Large components of grinding mills are connected by flanges. The flanges are fastened with bolts, some of which must be precision, since they take the load of the equipment and ensure the tightness of the connection. The holes for precision bolts, respectively, must be accurate and of high quality. A study of the processing of holes with a reamer is given. The cutting elements of the tool, in the form of multifaceted plates, are mechanically attached to the body, which makes it possible to quickly replace the plate in case of wear or breakage. Such an assembled combined cutting tool allows to perform countersinking and reaming in one operation and thereby reduce the processing time of one hole and, in general, all precision holes in the flanges of the mill being repaired. The dependence of the precision hole accuracy on the shape and spatial deviation from the cutting modes of processing when using a combined tool is derived. The dependence is established for processing using a portable device with a rising spindle, as the most used equipment for repairs. The presented dependence makes it possible to predict the accuracy of machining holes with a combined tool, taking into account the rigidity of the technological system and calculate the required reamer accuracy.

A Study on The Fully Enclosed Housing Of Interior Permanent Magnet Synchronous Motor

Approximately 2.5 billion won can be saved every year by replacing existing induction motors, which are traction motors for urban railway vehicles, with permanent magnet motors. This paper presents a study on the structural design of a completely enclosed motor to commercialize an interior permanent-magnet synchronous motor (IPMSM) for the traction of urban railway vehicles. The proposed solution provides protection from an inflow of dust and magnetic powder into the rotor that can deteriorate the motor performance and cause burnout. In addition, unless it is a water-cooled or oil-cooled structure, cooling of an electric motor used in medium and large-sized equipment is not easily accomplished. However, completely enclosed motors are vulnerable to overheating; therefore, research into housing design is required to provide cooling. Additionally, the permissible current density through the stator winding must be considered in the design to prevent the occurrence of thermal demagnetization of permanent magnets. Furthermore, IPMSMs require a separate driver for operation and speed controls for a wide range of operating conditions such as rail traction. Thus, a study has been conducted on IPMSMs and other related driver and control technologies, and their suitability has been validated through performance tests.

The Possibility of Using the Existing Large-Sized Equipment of the Units when Switching to New Oil Treatment Technologies

Oil treatment at field stabilization units allows preparing oil for storage and transportation, including by reducing the RVP and hydrogen sulfide content in oil. However, the use of direct fire heating of oil in pipe stills to maintain the thermal regime in the stabilization column may cause the formation of secondary hydrogen sulfide as a result of the thermal decomposition of heavy sulfur-containing hydrocarbons, which leads to additional financial losses for bringing the stabilized oil to the requirements of the current regulatory documents. A way to reduce the amount of secondary hydrogen sulfide is the transition from direct fire heating of oil to heating through an intermediate high-temperature coolant. In this case, the thermal regime of the stabilization column operation is maintained by heating in the reboiler, while it remains possible to use the existing unit columns and stills without their significant retrofitting.

Method for predicting the remaining life of the ball mill support axle based on changes in the design stresses of the external surface of the axle

The article considers a method for predicting the residual life of the ball mill support axle based on changes in the calculated stresses of the external surface of the axle. The main terms of forecasting the remaining life of large-sized equipment are considered. The task is set and controlled parameters are selected for the development of the methodology. An algorithm for implementing a method for predicting the residual life of the ball mill support axle based on external surface stresses is presented. A method has been developed for predicting the residual life of ball mill support axles based on changes in the design stresses of the external surface of the trunnion, which allows you to set parameters that affect the duration of the residual life without stopping the mill and to adequately calculate the residual life of the trunnion, including from the start of operation of the mill. The homogeneity of the obtained data is estimated. The parameters of the stress distribution of the external surface of the trunnion are determined, indicating that the obtained distribution corresponds to the theoretical Weibull distribution and the validity of using this method for predicting the resource of the ball mill support trunnion. The values of the guaranteed residual life of the ball mill trunnion are calculated according to the developed method. The analytical dependence of the residual life of the ball mill trunnion on the equivalent stresses occurring on the external surface of the trunnion is given.

Method of vibration power spectral density calculation for spacecraft attached large-size and small-mass equipment units

During the lift-off and the ascent phase, spacecraft (SC) large-size attached equipment is impacted by intensive vibrations, largely due to acoustic pressures. To ensure a reliable in-orbit operation of all SC systems the modes of vibration loads shall be assessed as much as reliable (using experimentally-confirmed mathematical models). Determination of the vibroacoustic response parameters of the equipment structure is a very important issue for such equipment units (elements) which have a large surface square with a relatively small mass. Among such structures are folded solar arrays (SA) and reflector type antennae dishes (ART). The purpose of this study is to validate the calculation methodology of vibration power spectral density (PSD) for low and medium frequency band (25-400 Hz), and apply it for the aforesaid structures in the lift-off and flight phases as part of the integrated launch vehicle in the area of maximum ram effects, when the acoustic pressure levels, and therefore their impact on the vibroacoustic response of these structures are maximum. The target goal has been implemented using the example of the solar array and reflector type antenna being used in the spacecraft power supply system and onboard radio system of one of RSC Energia-developed spacecraft. Key words: environment air, spacecraft, solar array, reflector type antennae dish, dynamic model, sound pressure level, acoustic pressure, structure vibroacoustic response.

Corrosion state of oil cracking reactors as the main factor of fire and explosion safety during their operation

The corrosion and mechanical properties of the oil catalytic cracking reactor vessel made of stainless steel Y1-T (1X18N9T) after its operation for more than 60 years have been determined. The chemical composition of the reactor metal meets the requirements of GOST and involves the isolation of non-metallic inclusions of manganese sulfide in its structure, which cause the development of pitting, and chromium carbides, which are responsible for the propensity to intergranular corrosion. After long-term operation, the mechanical characteristics of the metal (tensile strength σb, yield strength σt, elongation δ, relative contraction Ψ), determined using cylindrical samples at a temperature of 20 °C (GOST 1497-84) and at an operating temperature of 465 °C (GOST 9651), on the breaking machine TC 110M-50, correspond to the standard values. Metallographic studies carried out using an optical microscope “Axio Observer Z1m « at magnifications of X25, X75, x125, X200, X250, X400, X500, x1000, X2000 showed that long – term operation of the metal at a temperature of 375…425 °C with periodic overheating up to 550…650 °C leads to the release of excess phases, namely, chromium carbides and titanium carbonitrides. The metal grain boundaries are enriched with Cr23C6 carbides, which cause a loss of resistance against intergranular corrosion. Corrosion pitting and weakened metal grain boundaries are promoters of the occurrence of corrosion cracks. The most dangerous areas of large-size equipment are welded joints and zones of thermal influence. A mandatory condition for fire and explosionproof operation of the refinery is periodic diagnostics of the corrosion state of the equipment in order to identify and timely eliminate potentially dangerous areas, the probability of which breaching with subsequent spillage and fire of oil and petroleum products is the highest.

Design of Air Quality Monitoring System Based On Web Using Wireless Sensor Network

Air pollution (O3, SO2, CO, NOx, PM, and Pb) can have a severe impact on environmental damage and human health problems. Therefore, monitoring of pollutant levels in the air is essential to find out how much that gas levels can cause air pollution. In general, air quality monitoring is carried out using a conventional system. Inside the system requires large-sized equipment, long time for analysis, expensive, and with limited space resolution. It becomes inefficient, amid the development of technology that can carry out online monitoring, real-time, low cost, small size and a wide range of distance. The technology is known as the wireless sensor network system. The aim of this research is to design an air quality monitoring system using a Wireless Sensor Network (WSN) that can be accessed via the web and smartphone. The developing of WSN systems consist of two steps, are design and implementation device. The first step is done by assembling sensor nodes and hosting a web server. And after the device was finished, the next step is testing and calibrating of the system. The results of experiment show that the system is able to detect various air pollution, such as SO2, NOX, CO, and other environmental factors such as temperature, humidity and wind speed.

Rehabilitation of Building 53 at VNIINM

A complex of decontamination and dismantling work on removing radiation contaminated equipment and special utility lines in the previously mothballed building 53 at VNIINM has been implemented. The 33.1 m long air pathway between building 53 and building B, contaminated by α-emitters to 120 particles/(cm2·min), has been dismantled. Thirty-three pieces of large-size equipment were dismantled. Fifteen pieces of equipment were decontaminated. Special utility lines of the building were completely dismantled: ~140 m special drain lines and ~320 m special ventilation. Approximately 180 m of piping has been decontaminated. Low-waste decontamination procedures made it possible to reduce the amount of radwaste produced during rehabilitation work by more than 1.5 times (to 27 m3). A radiation survey established that the procedure has unlimited application in the enterprise’s business activities taking into consideration the location on the industrial site at VNIINM.

Experimental studies of restoration of ball mill trunnion

The article deals with the analysis of experimental data on reconstruction of cement mill axles by the auxiliary machine at the place of operation. Based on the experimental research in repair the regression models of large-size equipment are developed, coefficients of equations of regression are defined. Importance of coefficients is estimated, and the adequacy of regression models is checked.

Dismantling and decontamination of large-sized radiation-contaminated equipment during Research Building B decommissioning at the Bochvar Institute site

The article presents the results of work on dismantling the large installation equipment of Research Building B at the Bochvar High-technology Research Institute of Inorganic Materials (Bochvar Institute). The works were carried out as part of Building B preparation for decommissioning. The purpose of dismantling the large-sized capacitive equipment was to reconstruct the large installation site for managing radioactive waste generated during Building B decommissioning. The works on decommissioning a radioactively contaminated building within a densely populated district of megalopolis were carried out for the first time. The characteristics of the large-sized capacitive equipment are presented. Radioactive contamination of the capacitive equipment is determined by long-lived a-emitting isotopes: 235U, 238U, 239Pu. The sequence of works on dismantling the radiation-contaminated capacitive equipment includes preparatory work, dismantling the tank piping, localizing radioactive contamination of the external surface of the equipment as well as dismantling and moving it into a transport container. Dismantling and decontamination of the large-sized capacitive equipment was carried out by the Bochvar Institute Decommissioning Department. The following tools were used during the works: (1) a mobile foam decontamination facility to perform decontamination works and (2) a mobile high pressure facility to apply localizing and decontaminating film coatings. The tanks were dismantled by means of low-spark tools, i.e., reciprocating saws. Crane runways were made in order to move the dismantled equipment into transport containers: the movement was carried out with the help of a winch. The main results of dismantling and decontaminating the radioactively contaminated tanks are the dismantling of four units of long-length column-type equipment with heights from 4.2 to 6.4 m and 26 units of capacitive equipment (maximum capacity = 8 m3) as well as decontamination of the internal surfaces of radiation-contaminated equipment (decontamination factor = 25–70). As a result, the activity of the accumulated radioactive waste was reduced (the RW class was changed from 3 to 4). The main conclusion regarding the managment of large-sized radiation-contaminated tanks during Building B decommissioning is as follows: the works were organized and carried out at a high technical level, using modern decontamination and dismantling equipment and modern methods to ensure work safety at the Bochvar Institute site in the city of Moscow.