Repair Of Equipment Research Articles

Analisis Pengaruh Geometri Jalan Tambang Dari Front Penambangan ke Stockpile Terhadap Keselamatan Kerja PT Caritas Energi Indonesia Sarolangun Jambi

PT Caritas Energi Indonesia (CEI) is a company engaged in coal mining in Sarolangun Jambi. Based on the work accident data in the last 5 years of PT Caritas Energi Indonesia on the hauling coal getting road using dump truck transport Equipment Scania 380 P that resulted casualty and inflicted loss for the company both in terms of equipment repair and treatment of victims. The method on this research is to use quantitative data to calculate the width of straight road for sixty one segments, the width of bend road for fourteen segments, calculating the superelevation for fourteen segments, calculating hauling road slope (grade) for sixty one segments, calculating the cross slope for sixty one segments, analyzing the effect of road geometry on Occupational Health and Safety. The width of the straight road is 7 m for one line and 11 m for two lines, all segments were qualified, except Segment 0+400, Segment 0+700, Segment 1+600, thereforeit is necessary to increase the width of road to fit the standard, the width of the bend roadis 8 m for a single line and 13 m for two lines, all segments were qualified, exceptSegment 0+500, Segment 1+000 and Segment 4+100, superelevationbased on standard is 4%, not all of the superelevations were qualified so it needs to increase the width of the bend road so that it might avoid the centrifugal force while passing through the bend, all the grade of segmentswere qualified. PT Caritas Energi Indonesia didn’t have cross slope so the company needs to pay attention and make cross slope according to the standard of 40 mm/m. The geometry of the mining road of PT Caritas Energi Indonesia weren’t qualified, it might effectedwork accident so that it needs improvement accordance with standards

Многокритериальное моделирование процессов и конструкции камеры смешения пароструйного эжектора конденсационной турбины

The paper presents recommendations on designing an efficient mixing chamber and regulating air and steam flows in the elements of a steam-jet apparatus based on the results of multi-criteria modeling of gas-dynamic pro-cesses. The paper also reveals the possibilities to provide a greater reduction in losses, air suction into the turbine and equipment repair costs compared to the cases when individual criteria for increasing the steam turbine equipment efficiency are used. The selected calculation methods, i.e. innovative (multi-criteria) and standard (standard), have been analyzed comparatively. As a result of the methods evaluation, the authors se-lected the following indicators: increased energy efficiency of the turbine due to the prevention of air suction in the turbine seals; increased efficiency of condensing turbines; reduced repair and maintenance costs for the turbine and ejector due to the ejector mixing chamber cross-sectional area optimization. Based on the comparison, the best results were shown with the multi-criteria modeling according to the indicated parameters, the coefficients of the flow rate, working steam consumption, size reduction and increase in service life from 20 to 40 years. The innovative method requires a larger number of optimality criteria and the regulation of process pa-rameters and design geometry based on direct and feedback multi-criteria models. Using multi-criteria modeling, the authors determined the necessary composition of optimization parameters, i.e. the flow area of the designed mixing chamber, steam flow rate and thermodynamic flow parameters, as well as suction pressure.

PRACTICAL BASIS OF TEACHING MECHANICAL ENGINEERING TERMS

This article explains the need for the research in the field of engineering terminology, the process of teaching it in foreign languages, the comparative application of engineering terms in different languages and studying the development trends. Objective of the article is to describe the methodology of teaching mechanical engineering terminology on the basis of study research in the field of mechanical engineering as a complex of heavy equipment in industry that produces household appliances, as well as consumer electronics and products of defense importance. Methods of the investigation that enabled to: study and analyze mechanical engineering terms; develop methodology of teaching mechanical engineering terms; analyze selection and assessment criteria of case studies; analyze selection and assessment criteria of project-based teaching; organize pedagogical experiments and analyze their results. It is an integral part to investigate the sphere of machine-building and metalworking industries, the production of metal products, metal structures and the repair of machinery and equipment. Furthermore, the issues of teaching engineering terminology in order to form professional foreign language competence in technical students by means of using new pedagogical technologies are of high significance. Such as, typology of terms in the field of mechanical engineering, teaching terminology whereby case studies and projects, examples of case studies and study projects are given. It is also important to pay attention to the etymology and the sources of the formation of terms, their peculiarities and definitions in special contexts as a complex human speech and language activity. Results and discussion. The article discloses the processes of activating terminology for obtaining information, through cognitive activity. Research works in the field of mechanical engineering, the practical basis of teaching terms and its effectiveness are also analyzed. The terms, vocabulary related to the field of mechanical engineering, case studies and analysis of independent work assignments are taken into account in the organization and conducting the trainings defined in the pedagogical experiment. As a result of experimental research, it was proved by mathematical statistical methods that the efficiency was achieved by 15% in case studies and 17% in educational projects. It was found that the mean value of the scores in the experimental group was 17% higher than in the control group. Hence, the research conducted has proven to be effective. Conclusions. The difficulties that arise in the process of comparing terminological activities show not only the specificity of individual languages, but also the specific role of terms in the national language system. Comparing the terminology of the English and Uzbek languages in the field of mechanical engineering not only allows to determine the general and specific features of the terms of mechanical engineering in the two languages, but also provides an in-depth study of both terminological systems.

Сопряжение ФГОС ВО 21.03.01 «Нефтегазовое дело» и профессионального стандарта «Специалист по добыче нефти, газа и газового конденсата» на примере реализации дисциплин технологическое оборудование нефтегазовой отрасли и обслуживание и ремонт нефтепромыслового оборудования

The article makes an attempt to analyze the situation in the labor market in modern Russian society in connection with new conditions, rapidly changing technologies, digitalization of all production and management processes, and what awaits a university graduate in a new labor reality. The article deals with the issue of conjugation of federal educational standards of higher education of generation 3++ and professional standards in the implementation of bachelor’s programs. The study is based on the example of interfacing FSES HE 21.03.01 “Oil and Gas Business” and the professional standard “Specialist in oil, gas and gas condensate production” in the context of the implementation of disciplines Technological equipment of the oil and gas industry and Maintenance and repair of oilfield equipment and the formation of professional competence: able to carry out work for diagnostics, maintenance, repair and operation of technological equipment in accordance with the chosen field of professional activity at the Yugra State University. The positive aspects of the interface between PS and FSES of HE in the implementation of educational programs of higher education, the difficulties arising on the way of this process and possible solutions are noted.

How the SST TP Plant ensured safety during the coronavirus pandemic

The sudden spread of coronavirus infection has made its own adjustments in the activities of the company "Plant SST Warm Floors". The company was able to overcome difcult times without stopping its work. Thanks to ensuring the safety of employees, well-coordinated work of the team in conditions of constantly changing circumstances, it was able to show an increase in product output in all categories. Anton Lutsuk, head of the equipment service and repair group, SST Teplyi Poli Plant, tells about the measures taken by the company to prevent viral infection.

Health assessment of the electrical contact-line connections in view of the operational traction load pattern of the electric rolling stock

Estimation of the traction energy system reliability and efficiency due to timely and immediate identification of heating sites of contact joints is the future-oriented technology for the condition oriented service and repair of the electrical equipment of energy providers. It is peculiar with the roughly alternating load of the electric current action during the day. This makes it difficult to identify the current state of the electrical connection. Thus, it becomes necessary to specify the dependence of changes in the assessment criteria of the electrical connection condition in operation.

A metaheuristic based on tabu search for solving a technician routing and scheduling problem

This paper addresses a technician routing and scheduling problem motivated by an application for the repair and maintenance of electronic transactions equipment. The problem exhibits many special features like multiple time windows for service, an inventory of spare parts carried by each technician and tasks that may require a special part to be performed. A problem-solving methodology based on tabu search, coupled with an adaptive memory, is proposed. The inclusion of solutions (local minima) in the adaptive memory takes into account both quality and diversity. Results are reported on test instances with up to 200 tasks. A comparison with a previously developed branch-and-price algorithm is also reported on instances of small size.

Decision support system for evaluating the elements of data transmission systems

Aim . At present, the construction of data transmission networks is undergoing rapid development, which actualized the problem of the timely maintenance, repair, and modernization of network equipment. This article provides a step-by-step description of the decision support system for evaluating the elements of data transmission systems used to improve the efficiency of telecommunication network maintenance. Method . The research methodology involved the methods of system analysis, fuzzy set theory, neural networks, graph theory, and mathematical modelling. Results . A decision support system was developed for evaluating the operational state of the elements of data transmission system during operating the network infrastructure of a communications service provider. Conclusion . The developed decision support system reduces the workload of highly qualified personnel and improves the quality of decisions made during the development of data transmission networks.

PERAMALAN DAN PENENTUAN WAKTU PEMESANAN KEMBALI YANG OPTIMAL DENGAN METODE EXPONENTIAL SMOOTHING DAN METODE ECONOMIC ORDER QUANTITY (STUDI KASUS SUMBER MAKMUR)

Application for forcasting the number of items the next day, determining optimal revervation time and determine the optimal number of or reorder items by using the method Single Exponential Smoothing, Double Exponential Smoothing, Economic Order Quantity(EOQ), and Reorder Quantity(ROP). This method was created for Store Sumber Makmur. Store Sumber Makmur is a shop that sells motorcycle tools, equipment, parts, accessories, lubricating oil, maintaince, and motorcycle repair services. There are programming languages used to make this application, namely PHP. php for the user interface and python for the calculation. Testing was done by User Acceptence Testing (UAT) and testing of data. UAT testing for check buttons and features

PREVISION AND OPTIMISATION OF REPAIRABLE SPARE PARTS: A CASE STUDY IN THE PETROLEUM INDUSTRY

This study was motivated by the high costs incurred by an energy company for repairable spare parts for faulty mission-critical items, particularly with those that operate until failure. The objective of this paper is to develop and apply a method for repairable spare part inventory management of run-to-failure equipment. To achieve a robust method that incorporates the data collected from previous failures, such as environmental factors and operating conditions, we propose an optimisation approach based on an accelerated failure time model. Accelerated failure time is used as a reliability regression model with covariates to describe different operational conditions. An algorithm is also developed to consider the repairable nature of the equipment, predicting the number of spare parts based on the expected number of failures in the period and the equipment repair cycle. The proposed method is applied using data from three different power units of electrical submersible pumps, a mission-critical item in oil production. The results show an average reduction of 60.6 per cent in the required number of spare parts, considering an average fill rate of 95.33 per cent. This reduction implies an estimated annual savings of around US$664,720 in inventory costs, considering the analysed units.

SISTEM PERHITUNGAN PENGGAJIAN PEKARYA BERBASIS WEB DI PT. PETROWELL ENERGI

PT. Petrowell Energi is a company engaged in contracting, trading, repair for industrial equipment and the provision of services for empowering human resources. In providing services, this company processes its data using a computerized but simple payroll system that uses software Ms. Excel, so that in processing data experienced obstacles that cause the process of errors such as incorrect inputting salary data, personal data and salary reports that must be calculated and the process of calculation is repeated from each employee. The purpose of this web-based payroll information system is to overcome the problems that arise in the manual system currently running at PT. Petrowell Energy as well as being a good solution for companies for the creation of a more transparent and accountable system, in its processing it will be more effective and efficient. The method of data collection is done by means of interviews, observations, documentation and analysis of systems used by the company. The results of this study are to produce a computerized payroll information system that is provided with ease in providing payroll data information such as employee data information, and payroll data. In payroll data information systems, the authors use data flow diagrams, DFD, ERD, and MySQL for data processing.

Evaluation of the stressed-deformed state of the apparatus taking into account the influence of adjacent equipment and its geometric deviations

For timely field monitoring of equipment, the widest arsenal of non-destructive testing methods is used, which with a sufficient degree of reliability allows determining the degree and admissibility of defects in accordance with established standards. The required list of works and the established values are established by regulatory documents on industrial safety and technical diagnostics. As a rule, each device is subjected to a technical inspection individually with an individual set of tools to predict the residual life of a safe service. Existing methods do not take into account the possible impact on the surveyed apparatus of the loads and effects exerted by operational environment devices of the tested device. In addition, the current regulatory and technical documentation does not take into account the mutual influence of the quality of installation or repair of interconnected equipment. Various geometric deviations appearing during installation, repair, or operation, such as, for example, deviations from verticality, can serve to redistribute the stress-strain state and lead to premature failures and decommissioning. In this paper, we study the relationship between the impact of equipment in a technological connection on the operational parameters, as well as that of the geometric deviations of adjacent equipment on the stress-strain state of the apparatus.

Safety enhancement during deep well pump replacement

In Ukraine, as in other countries of the world, the majority of oil wells are operated using a mechanical method of production, such as rod well pumping method, containing above-ground and underground equipment. For repair or replacement of underground equipment (down hole pump), is brought to the surface. In this case, the well may have oil-water gas inflow caused by the «piston» effect, for example. (Substitution of volume between the pump and the pump rods by fluid from the formation). This could lead to an open flowing well. Many additional complex operations are used to perform safe well workover operations, such as well closure. These operations are performed to control well formation pressure, prevent gas-oil and damage to downhole equipment. It is also worth paying attention to the fact that disruptions in the process of well closure can lead both to a decrease in its productivity and to the complete termination of its operation. To prevent oil-water gas inflow various equipment and devices are used: Cameron ram-type blowout preventer, wellhead stuffing boxes, emergency washers with gate valves, downhole shutoffs, downhole check valves. All this increases safety when replacing downhole equipment, but does not guarantee the avoidance of additional complications in the operation of this equipment: the possibility of controlled shutdown of the well, recovery of oil production without performance of downhole operations, etc. To eliminate these complications, a downhole check valve design was developed. Its design allows: not to change the arrangement of elements in the well; to change the pump without well closure (it reduces repair time and costs); undercut tubing (does not allow the fluid from the formation to enter the well and create an emergency situation that could lead to open well flowing).

Diagnostic Radiology in Nigeria: A Country Report

Nigeria is located in West Africa. The Nigerian healthcare system is stratified into three tiers corresponding to the three tiers of government: primary (local), secondary (state), and tertiary (federal). In addition to this public health structure, private facilities play a significant role in healthcare delivery. Nigeria has a shortage of healthcare equipment and personnel, with a doctor per 1,000 population ratio of 0.17, which is one of the lowest on the African continent. Despite these challenges, a wide range of medical imaging services is available in the country, through a network of public and private facilities. The public healthcare system, which serves the majority of Nigerians, is weak due to lack of adequate funding, personnel and equipment. This gap is closely bridged by private healthcare facilities, which account for 70% of health services coverage in the country. Training in diagnostic radiology is evolving, with two postgraduate colleges being responsible for the regulation of radiology training in the country: the National Postgraduate Medical College of Nigeria and the West African College of Surgeons. There are also higher institutions of learning which are responsible for the training of other imaging professionals. The major challenges of radiology practice in Nigeria are the unavailability of constant electricity as well as the problems of equipment availability and repair.

Repair equipment allocation problem for a support-and-repair ship on a deep sea: A hybrid multi-criteria decision making and optimization approach

To address the repair equipment allocation problem for a support-and-repair ship on a deep sea, a hybrid multi-criteria decision making and optimization approach is designed. Evidence reasoning approach is used to aggregate the evaluation information of quantitative criteria (i.e., weight and economics) and qualitative criteria (i.e., repair ability, reliability and convenience). Then, a mathematical repair equipment allocation model of a support-and-repair ship is formulated, which is a mixed-integer nonlinear model. A removal strategy based on a greedy algorithm that modifies infeasible solutions is designed to facilitate the use of a genetic algorithm with an elite strategy to address the model above. The proposed solution method using the removal strategy based on the greedy algorithm obtains better solution accuracy and global search performance than three widely used penalty-based methods by several test instances generated randomly. The results of a case study prove that the mathematical model and solution method can effectively obtain the optimal repair equipment allocation solution. The hybrid multi-criteria decision making and optimization approach has certain guiding significance for decision makers to determine their repair equipment allocation strategies for support-and-repair ships on a deep sea in practice.

ГИГИЕНИЧЕСКИЕ УСЛОВИЯ НА РАБОЧЕМ МЕСТЕ ЭЛЕКТРОГАЗОСВАРЩИКА 6 РАЗРЯДА

The working conditions at the workplace of an electric gas welder of the 6th category of the workshop for maintenance and repair of instrumentation and automation equipment are considered. Unfavorable working conditions for chemical and acoustic factors were revealed.

Possibilities of 3D-scanning technologies in the repair of agricultural and forestry equipment

The share of the main types of agricultural machinery with a service life of more than 10 years in the total volume of equipment remains high. The maintenance the performance of machinery and equipment are performed mainly by repair and restoration processes. In recent years, there used a 3D-scanning technology in the repair of machines. (Research purpose) The research purpose is in searching for the possibility of using 3D-scanning technologies in the repair of equipment based on the analysis of information materials. (Materials and methods) Authors used open information sources from various scientific and educational organizations for analysis. The great attention has been paid to the analysis of 3D-scanning technologies presented at various international specialized exhibitions. It was found that various laser scanners have been developed and used for 3D-scanning, mainly for quality control of parts manufacturing. It was also found that they can be used to control the geometric, physical and mechanical parameters of agricultural machinery parts during the input control of spare parts and repair of machines. (Results and discussion) It has been found that 3D-scanning improves the accuracy and performance of measurements in comparison with contact devices. The article notes that the use of 3D-scanning in convergent modeling technologies and in additive manufacturing is becoming a modern trend in mechanical engineering. (Conclusions) A promising direction for the introduction of 3D-technologies in repair production is the integrated use of additive technologies and 3D-scanning; when parts are defective after disassembly of the repaired units, the machine uses a 3D-scanner to determine the wear, and a 3D-printer to restore the worn surface, taking into account the uneven wear. The advantages of this repair technology include increasing the accuracy of measurement, reducing the range of measurement tools used, and the ability to restore parts of complex geometric shapes. Spot application of a layer of additive material to the wear site reduces material consumption by 20-90 percent.

Performance evaluation of near real-time condition monitoring in haul trucks

Strategic maintenance plays a key role in ensuring high availability and utilization of the haul trucks, and as equipment began to grow more complex towards the end of the 20th century, there was a need for a proactive maintenance strategy, which led to the development of condition-based maintenance. Real-time condition monitoring (RTCM) is the ability to perform condition monitoring in real-time and has the ability to alert maintenance and operations of abnormal conditions. These alarms can be used as an indication leading to a problem, and if a suitable corrective action is initiated in time, it could result in significant savings of equipment downtime and repair costs. This study aims to compare some maintenance performance indicators prior to and after implementation of RTCM strategy at a mine site using some tests of statistical significance. The study also indicated the presence of seasonality in the data, and thus the data was deseasonalized and detrended prior to being subjected to the statistical tests. Finally, the results indicated that RTCM strategy has proven to be successful in improving the availability for some of the failure categories chosen in this study.

Determination of the priority of withdrawal to repair of equipment of anti-corrosive protection on the section of the gas pipeline in the conditions of restriction of financing

Based on the experience of the operating organizations and results of previous studies, it is determined, that the more rational criterion for the withdrawal in the repair of insulation coating on the section of the pipeline is the reserve of the current from the nominal value, and the criterion of withdrawal in the repair of anode grounding is a reserve of voltage from the nominal value. It has been revealed that with data on changes in the output parameters of the cathode protection station and protection potential at the control point for a certain period, it is possible to predict the change in the factor of influence of the station at this point for a certain period and, therefore, to predict changes in the modes of operation of this station and the technical condition of the anti-corrosion protection system at the specified required range of maintenance level of protective potential. Based on the above conclusions, algorithms have been developed to assess the residual resource of the anti-corrosion protection system on the gas pipeline site and make management decisions on its extension based on the received values in the conditions funding restrictions. Also, an algorithm has been developed to determine the residual resource of the anti-corrosion protection system with the most effective redistribution of parameters between the cathode protection stations and an algorithm that allows to determine the priority of output in the repair of the system elements.

Застосування моделі технічного обслуговування техніки з почасовою надмірністю для підвищення її надійності в ході виконання завдань підрозділами інженерних військ ЗС України при проведенні операції Об’єднаних сил

In the article by means of the theory of time reservation the reasonableness of use of planned downtime of engineering equipment for preventive maintenance and current repair in order to maintain its reliability at the required level is substantiated. To quantify the impact of the process of organizing the functioning of the maintenance system in accordance with the proposed model to change the level of reliability of engineering technology developed a method of calculating the coefficient of technical use of engineering machines, which takes into account not idealized, but the real possibilities for the use of daily downtime of the equipment as a reserve time its technical use.