Maximum Working Time Research Articles

Technostress Phenomenon as a Silent Impact of ICT Era: Case Study Indonesian Female Civil Servants

The transition of work systems from traditional systems to information, communication and technology (ICT)-based work systems after Covid 19 has had certain impacts on employees in all government offices in the world. The implementation of the work from home (WFH) policy established by a number of government offices in Indonesia is a reasonable decision to anticipate the spread of Covid 19 and implement a new normal work system. The transition from traditional work systems to new ICT-based and online work systems has had a direct and indirect impact on human life, especially civil servants in government offices in Indonesia. There are silent actors who are most affected, suchus women or mothers employee, because they have dual roles, household work and office work. This research was conducted to analyze the factors that driving technostress in female civil servants when working ICT-based or online. The study aims to carry out advocacy and provide recommendations for solutions to related parties. This research method uses a qualitative approach. The research analysis show that there are several factors that trigger technostress in female civil servants in Indonesia, such as unlimited working hours, when children or family members are sick, have to caring babies or toddlers while working virtually, technological capabilities issue, signal and network issue, limited facilities during WFH, unavailability of household assistants/caregivers, and so on. Based on the results of research and data analysis, this research recommends that even though WFO or WFH with working ICT -base system are implemented, the Indonesian Government must continue to make policy regulations regarding maximum working time hours for civil servants, especially female researchers in Indonesia. This is to avoid excessive and inefficient working time which can result in technostress. The ICT work system teaches us to change our lifestyle by prioritizing health and a balanced work system.

Uji Performa Alat Pengering Tray Dryer Untuk Komoditas Hasil Pertanian Yang Memanfaatkan Kalor Buangan Kondensor Mesin Pengkondisian Udara (Air Conditioning) Domestik

The drying methods currently used by farmers still rely heavily on direct solar power, so that the continuity of drying to reduce water content cannot be controlled properly, which has a direct impact on the low quantity and quality of drying results, as well as poor product hygiene. Utilization of condenser waste heat from cooling machines is one of the development applications for heat pump systems. The advantages of heat pumps for the drying process include their ability to control the temperature and humidity in the drying chamber, so that they can be adjusted for various drying conditions and the drying process is more efficient and environmentally friendly. This research aims to determine the performance of drying machines for agricultural commodities (cocoa beans) using the method of developing a domestic air conditioning machine, by adding a condenser arranged in series with the main condenser to function as a drying chamber. The results of the modification of this tool consist of five main parts, namely the compressor, tray dryer room (additional condenser), main condenser, expansion valve, and evaporator. Testing of this dryer was carried out with two types of experiments, namely experiments without load and experiments with load. The test was carried out at the maximum working time of the condenser by setting the lowest working evaporator, namely 16°C. The lower the working temperature of the evaporator, the higher the working temperature of condenser 1. This is done to get maximum work from this modified dryer. Based on tests for temperature and relative humidity (RH) under load and no-load conditions, the values are not too different. After approximately 2 hours of operation or when the machine was working in steady state, the highest temperature was obtained at 87°C while the highest average RH was obtained at 78% in the drying rack space. The performance of this agricultural commodity drying machine has functioned well, especially for cocoa beans which have been dried to a standard moisture content of 7.5% in accordance with SNI 2322-2008 for an operating time of 130 minutes. The dryer system by utilizing exhaust heat from the condenser in this domestic air conditioning machine can work well without reducing its main function as indicated by the maximum temperature value of 20oC around the evaporator.Â

Hemoglobin, maximal heart rate and work capacity, as well as time to exhaustion are significantly improved with combined hypoxia and aerobic exercise training in healthy adults: a meta-analysis

Abstract Funding Acknowledgements Type of funding sources: None. Background/Introduction Hypoxic conditions have been used for a variety of reasons and have been implemented in multiple ways in an attempt to improve physiologic performance. Hypoxic conditions are administered via real or simulated altitude or by breathing lower levels of oxygen via facemask to improve different physiologic processes. Maximal work capacity (MWC) and time to exhaustion (TTE) are important factors related to sports performance. It is unclear how aerobic exercise (AE) with hypoxia effects MWC, TTE, and maximal heart rate (MHR) as well as hemoglobin (Hgb) and hematocrit (Hct) concentrations. Purpose Examine the effects of chronic AE with and without hypoxia on MWC, TTE, MHR, Hgb, and Hct. Methods A comprehensive search using PubMed, Cochrane, and PEDro was performed using a variety of keyword permutations on "hypoxia" and "aerobic exercise" in healthy adults. Inclusion criteria were studies with both a control and experimental group in which chronic AE was performed with and without hypoxia and MWC and TTE were provided in Watts and seconds, respectively. Study quality was assessed using the PEDro scale. Statistical analyses were performed using R with sub-analyses examining changes in Hgb, Hct, and MHR. Results A total of 16 studies met the inclusion criteria yielding a total sample size of 389 healthy adults. Study quality ranged from 4 to 6 out of 10 (mode=5). Significant tests for the overall effect of AE with hypoxia compared to AE without hypoxia on MWC and TTE were found under random-effects models (Z=2.83, p<.001, 95% C.I. = 0.29-1.60 and Z=2.94, p<.001, 95% C.I. = 0.80-4.00, respectively). A significant test for the overall effect of AE with hypoxia compared to AE without hypoxia on Hgb was also found (Z=2.06, p=.03, 95% C.I. = 0.01-0.60; fixed-effects model), but a non-significant overall effect on Hct was observed (Z=1.24, p=.21, 95% C.I. = -0.19-0.85; random-effects model). A significant test for the overall effect of AE with hypoxia compared to AE without hypoxia on MHR was also found (Z=2.84, p<.001, 95% C.I. = 0.19-1.04). Substantial heterogeneity was observed in all analyses (I2 range of 64% - 89%). Conclusions Chronic AE with hypoxia elicits a significantly greater increase in MWC and TTE compared to AE without hypoxia in healthy adults. The significant improvement in Hgb and increased MHR provides a rationale for the improvement in MWC and TTE associated with chronic AE combined with hypoxia. Improvements in MWC and TTE have the capacity to improve sport performance. Further investigation of AE with and without hypoxia on specific sports and on other physiologic measures is warranted.

Research on outpatient capacity planning combining lean thinking and integer linear programming

BackgroundThe size and cost of outpatient capacity directly affect the operational efficiency of a whole hospital. Many scholars have faced the study of outpatient capacity planning from an operations management perspective.ObjectiveThe outpatient service is refined, and the quantity allocation problem of each type of outpatient service is modeled as an integer linear programming problem. Thus, doctors’ work efficiency can be improved, patients’ waiting time can be effectively reduced, and patients can be provided with more satisfactory medical services.MethodsOutpatient service is divided into examination and diagnosis service according to lean thinking. CPLEX is used to solve the integer linear programming problem of outpatient service allocation, and the maximum working time is minimized by constraint solution.ResultsA variety of values are taken for the relevant parameters of the outpatient service, using CPLEX to obtain the minimum and maximum working time corresponding to each situation. Compared with no refinement stratification, the work efficiency of senior doctors has increased by an average of 25%. In comparison, the patient flow of associate senior doctors has increased by an average of 50%.ConclusionIn this paper, the method of outpatient capacity planning improves the work efficiency of senior doctors and provides outpatient services for more patients in need; At the same time, it indirectly reduces the waiting time of patients receiving outpatient services from senior doctors. And the patient flow of the associate senior doctors is improved, which helps to improve doctors’ technical level and solve the problem of shortage of medical resources.

Development of algorithm for work intensity evaluation using excess overwork index of construction workers with real-time heart rate measurement device.

The construction workers are vulnerable to fatigue due to high physical workload. This study aimed to investigate the relationship between overwork and heart rate in construction workers and propose a scheme to prevent overwork in advance. We measured the heart rates of construction workers at a construction site of a residential and commercial complex in Seoul from August to October 2021 and develop an index that monitors overwork in real-time. A total of 66 Korean workers participated in the study, wearing real-time heart rate monitoring equipment. The relative heart rate (RHR) was calculated using the minimum and maximum heart rates, and the maximum acceptable working time (MAWT) was estimated using RHR to calculate the workload. The overwork index (OI) was defined as the cumulative workload evaluated with the MAWT. An appropriate scenario line (PSL) was set as an index that can be compared to the OI to evaluate the degree of overwork in real-time. The excess overwork index (EOI) was evaluated in real-time during work performance using the difference between the OI and the PSL. The EOI value was used to perform receiver operating characteristic (ROC) curve analysis to find the optimal cut-off value for classification of overwork state. Of the 60 participants analyzed, 28 (46.7%) were classified as the overwork group based on their RHR. ROC curve analysis showed that the EOI was a good predictor of overwork, with an area under the curve of 0.824. The optimal cut-off values ranged from 21.8% to 24.0% depending on the method used to determine the cut-off point. The EOI showed promising results as a predictive tool to assess overwork in real-time using heart rate monitoring and calculation through MAWT. Further research is needed to assess physical workload accurately and determine cut-off values across industries.

Right to Rest of the Self-Employed under International and EU Law

The main objective of the foregoing article will be to determine whether a self-employed person has the right to rest under international and EU law. According to the research conducted by the OECD, in 2021, the self-employment rate for all countries reached 16.5% of all employed persons. Therefore, bearing in mind that self-employed persons constitute such a large group of all people who provide paid work, it is justified to consider whether they may be entitled to the appropriate protective guarantees, also in the area of the right to rest. Appropriate rest includes not only the right to a holiday, but also a period of daily and weekly rest and the limitation of the maximum working time. The right to rest is also very important in terms of work efficiency and safety in the workplace. Therefore, efforts should be made to ensure that every contractor, including the self-employed, has the right to a proper rest in order to regenerate his strength and exercise the right to health and safety, which every person is entitled to according to international legal regulations.

Evaluating and modelling a decentralised community-based waste collection system in developing São Tomé city

A small-scale waste collection service by means of a motor tricycle was put in place by the community of Boa Morte (in São Tomé e Príncipe), as a solution to face the lack of an adequate waste management in their neighbourhood. A qualitative and quantitative evaluation of the service was performed by the authors, including a characterisation of the generated waste, interviews with the population involved, a technical assessment and the development of a cost model. With respect to technical aspects, the vehicle chosen has been found to be a satisfactory choice, whereas the productivity of collection is still too low due to the dispersion of collection points. Concerning financial aspects, the cost model reveals that the scale of the scheme is still too small to be completely sustained by its own revenues, but this objective of self-sustainability is achievable within the limits defined for the system, by adding a determined number of new customers without exceeding the fixed maximum working time and introducing some improvements and time optimisation.

Thermal Performance Analysis of Various Heat Sinks Based on Alumina NePCM for Passive Cooling of Electronic Components: An Experimental Study

In the modern digital world, electronic devices are being widely employed for various applications where thermal performance represents a significant technical challenge due to continued miniaturization, high heat generated in the system, and non-uniform high-temperature causing failure. Phase change materials (PCMs) owing to the immense heat of fusion are primarily considered for thermal management, but their insulating properties hedge their applications in electronics cooling. Nano-enhanced phase change materials (NePCMs) have the ability to improve the thermal conductivity of PCM, decrease system temperature and escalate the operating time of devices. Accordingly, the current study focused on the experimental investigations for the thermal performance of three heat sinks (HS) with different configurations such as a simple heat sink (SHS), a square pin-fins heat sink (SpfHS), and Cu foam integrated heat sink (CufmHS) with various alumina nanoparticles mass concentrations (0.15, 0.20 and 0.25 wt%) incorporated in PCM (RT-54HC) and at heat flux (0.98–2.94 kW/m2). All HSs reduced the base temperature with the insertion of NePCM compared to the empty SHS. The experimental results identified that the thermal performance of CufmHS was found to be superior in reducing base temperature and enhancing working time at two different setpoint temperatures (SPTs). The maximum drop in base temperature was 36.95%, and a 288% maximum working time enhancement was observed for CufmHS. Therefore, NePCMs are highly recommended for the thermal management of the electronic cooling system.

Health management of laser rangefinder considering maximum continuous working time

Health management of laser rangefinder considering maximum continuous working time

Heat Strain Evaluation of Power Grid Outdoor Workers Based on a Human Bioheat Model

Power grid outdoor workers are usually exposed to hot environments and could suffer the threats to occupational health and safety like heat strain and injury. In order to predict and assess the thermophysiological responses of grid workers in the heat, the clothing thermal insulation of grid worker ensembles was measured by a thermal manikin and a multi-segment human bioheat model was employed to evaluate the thermophysiological response parameters of grid workers such as core temperature, skin temperature and sweat loss. The results show that working in a hot environment can cause a obvious increase in core temperature and skin temperature of grid workers, and the acceptable maximum working time of grid workers varies greatly in different hot environments. A reasonable work organization strategy can effectively decrease the core temperature and sweat loss, increasing the duration of acceptable maximum working time for grid workers. This study is helpful to assess heat-related risks of grid workers and support power grid companies to rationalize work organization strategies and personal protection guidelines.

Evaluation of radiological safety according to accident scenarios for commercialization of spent resin mixture treatment device

Spent resin often exceeds radiation limits for safe disposal, creating a need for commercial-scale treatment techniques to reduce resin radioactivity. In this study, the radiological safety of a commercialized spent resin treatment device with a treatment capacity of 1 ton/day was evaluated. The results confirm that the device is radiologically safe in the event of an accident. This device desorbs 14C from the spent resin, allowing disposal as low-level waste instead of intermediate-level waste. The device also reduces overall waste by recycling the extracted 14C. Potential accident scenarios were explored to enable dose assessments for both internal and external exposure while preventing further spillage of the device and processing the spilled resin. The scenarios involved the development of a surface fracture on the resin mixture separator and microwave systems, which were operated under pressure and temperature of 0–6 bar and 0–150 °C, respectively. In the case of accidents with separator and microwave device, the maximum allowable working time of worker were derived, respectively, considering external and internal exposures. When wearing the respirator corresponding to APF 50, in the case of the microwave device accident scenario, the radiological safety was confirmed when the maximum worker worked within 132.1 h.

An empirical study of taxi crashes in Singapore

The 36-month taxi crash data include 41,538 taxi crash records distributed throughout 29 districts of Singapore (including Changi Airport), involving 16,933 taxis and 16,705 taxi drivers. We purposely use these data to analyze the impacts of nine influential factors on taxi crashes and give quantitative and practical suggestions on taxi driving safety. Our solid analysis shows that the maximum daily working time for a taxi driver is suggested to be less than 10 h for safety concerns because it could reduce the possible taxi crashes. In addition, the likelihood of taxi crashes in the daylight is the highest when compared to road conditions with streetlights or one without streetlights at all. We further use the random forest method to find the critical influential factors in blue and yellow taxi crashes. The relief and switcher modes are the two unique factors contributing to taxi crashes that are different from private car crashes. The findings of this study are of significant value for taxi operators and policymakers.

Labor disputes of teaching staff from among the teaching staff

This article deals with separate groups of labor disputes of teaching staff from institutions of higher education. Based on the author’s expert experience, it has been established that the most common causes of such disputes are the uneven workload distribution during the academic year, incomplete and inaccurate representations of the employee about the content of his work duties, issues of conditions of remuneration, and conduct of competitive procedures. Disputes over the conclusion and extension of contracts are a separate category. On the example of cases considered by the courts of the Republic of Belarus, it is shown what evidence of violation of labor legislation by the employer is accepted by the courts and what circumstances are given legal significance. Particular attention is paid to the procedural aspects of the inter-action of the parties to the employment contract, including compliance with the requirements for the written form of familiarization of the employee with certain information. Based on the analysis of disputes related to the volume of the academic load, and taking into account the possibility of its uneven distribution by semesters, the proposal is substantiated to establish for teachers a cumulative accounting of working time in compliance with the minimum and maximum working hours per week and the maximum working time for the entire account-ing period in accordance with the requirements of labor legislation. A contradiction has been revealed between the norms on the procedure for holding a competition for the positions of teaching staff and the norms of the labor legislation of the Republic of Belarus. The importance of a collective agreement in ensuring the rights of employees from among the teaching staff, including the right to extend the contract, is shown.

Impact of SARS-CoV-2 pandemic on dermatology residents: A nationwide French study.

Background Coronavirus disease 2019 (COVID-19) has changed the practice of all health-care professionals. Determining the impact could prevent repercussions in future crisis. Objectives The objectives of the study were to assess the impact of the COVID-19 pandemic on dermatology residents' professional practice, working conditions, academic training and mental health. Methods An online questionnaire was sent to all French dermatology residents. We compared the activity of residents working in areas heavily impacted by COVID-19 to others. Logistic multivariate regressions were done, using as outcome variables the negative impact of the COVID crisis on residents' possibility to practice dermatology during the crisis, supervision, academic training and working more than 50 h/week. The last part of the questionnaire was the burnout questionnaire of Maslach. Results A total of 246 residents filled the questionnaire. Residents working in highly impacted COVID areas (odds ratio, OR 0.34 confidence interval, CI [0.18, 0.61], P ≤ 0.001), first-year postgraduate (PGY-1) residents (OR 0.46 CI [0.23, 0.91], P = 0.023) and those in private practice (OR 0.10 CI [0.01, 0.57], P = 0.032) were significantly less able to maintain dermatology activities. Worse supervision was significantly more frequent with non-PGY-1 residents (OR 3.24 CI [1.65, 6.65], P < 0.001). One hundred and eighty one residents claimed the pandemic to have a negative effect on their dermatology curriculum with no difference according to their regions' affection by COVID-19. This was mostly attributed to the cancelation of courses and congresses. PGY-1 residents (OR 2.09 CI [1.09, 4.04], P = 0.029) and residents in highly affected areas (OR 1.79 CI [1.01, 3.18], P = 0.049) were more at risk of working above the maximal legal working time. None of the residents was free of burnout symptoms. Conclusion Dermatology residents have been highly affected by COVID-19. It might be important to have a more integrated healthcare system to fight times of crisis with the least repercussions on residents.

Multi-Objective Evolutionary Algorithm for Path Optimization of Urban Express Vehicles

In view of the actual situation of delivering express delivery in the city. Put forward five objectives: the number of vehicles, total distance, maximum working time, early delivery time, delayed delivery time. Also designed three-stage multi-objective genetic algorithm. A large number of solutions were randomly generated in the first stage of the algorithm, and the approximate Pareto front was quickly found from the solution set with the extreme solution and elite strategy, while the local optimization algorithm is used to optimize the extreme solution. The second stage is divided into multi-objective problems according to the importance of the target, and the path of the unified distribution station is optimized by local optimization algorithm to obtain the relative optimal solution. The third stage corrects the obtained solution with mixed neighborhood, which makes the final solution meet the requirements of express delivery, and solves the occasional local optimal solution problem. Experiments show that this algorithm is superior to the two commonly used algorithms in multi-objective express delivery scenarios.

Physiological Response in a Specialist Paramedic During Helicopter Winch Rescue in Remote Wilderness and Extreme Heat.

Tasks performed by search and rescue (SAR) teams can be physically demanding. SAR organizations are faced with mounting challenges due to increased participation in recreation in remote locations and more frequent extreme weather. We sought to describe the physiological response and the methods for data collection during helicopter emergency medical service (HEMS) winch rescue from remote wilderness in extreme heat. A flight paramedic sustained 81% of maximum heart rate (VO₂ ~44.8 mL/kg/min) for ~10 minutes at a rate of perceived exertion of 19/20, and a relative heart rate of 77.5% in 37.1°C. Maximal acceptable work time for this task was calculated at 37.7 minutes. Our data collection methods were feasible, and the data captured demonstrated the level of physiological strain that may be encountered during HEMS SAR operations in austere environments and hot climate. It is essential that SAR teams that perform physically demanding tasks use a scientific approach to adapt and evolve. This is necessary to ensure personnel are appropriately selected, trained, and equipped to respond in an era of increasing demand and extreme environments.

Analysis of the work of a “renewable” methanol production installation based ON H2 from electrolysis and CO2 from power plants

This article presents a thermodynamic analysis of a system for producing “renewable” methanol from H2 generated from electrolysis, fed by surplus energy from a 40 MW wind farm WF during the night valleys and from CO2 captured from a power plant’s flue gas. A methodology determining the energy efficiency of the entire methanol production and purification installation was developed, as well as a methodology for determining the efficiency of its components, i.e. the hydrogen generator HG (ηHG) and the methanol generator MG (ηMG). A number of effective ways to improve these efficiencies were proposed and analyzed. To evaluate the cooperation of the HG with a WF, a number of indicators were introduced: an indicator of the maximum working time utilization, a rated power index for the generator, an energy storage indicator, and an indicator for the working time with nominal power. The listed efficiency and indices were determined as a function of the nominal power of the HG in relation to the nominal power of the WF (in a range from 1 to 45%). The energy efficiency of the entire system under study, η, ranged from 45.5% to 52.9% with a MG efficiency of 69%–69.64%. The use of heat from compressed gases increased the efficiency η by 0.98 p. p. Relative to the best variant, while the use of compressed gas heat, waste heat from the methanol production and purification installations, and the use of the chemical energy of residual gases gave a possibility of achieving an efficiency exceeding 60% (60.4%).

Numerical simulation of the melting of a NePCM for cooling of electronic components

In this paper, a numerical study is carried out to investigate the melting process of a nano-enhanced phase change material (NePCM) in a latent heat thermal energy storage unit (LHTESU) with insertion of Cu nanoparticles. The use of such a strategy provides passive cooling of a protruding electronic component attached to a substrate. The governing equations of heat transfer are solved using the enthalpy-porosity technique and the finite volume method based using a personal FORTRAN code. An investigation of the effect of the PCM quantity is carried out taking into account three different values of the characteristic length lo (0.06 m, 0.08 m and 0.10 m) which represents the PCM quantity. The effect of nanoparticle characteristics, including volume fraction and shape factor on melting rate, are also discussed. The results showed that the maximum operating temperature of the electronic component decreases by 2.9 °C with an insertion of a nanoparticles fraction of 0.04 and a characteristic length of 0.08 m. For the same characteristic length, the melting time is 8630 s, 8460 s and 8290 s with nanoparticles fraction of 0.00, 0.02 and 0.04, respectively. With the nanoparticles fraction of 0.04, the amount of sensible heat stored within the PCM increases by 1.3% and the latent heat decreases by 1.1%. In addition, the insertion of nanoparticles with a shape factor of 16.1 reduces the maximum operating temperature of the electronic component by 2.5 °C. Correlations, giving the electronic component maximum working time and the plateau temperature, were developed using the asymptotic computational fluid dynamics technique (ACFD).

Abstract No. 658 Exercise intolerance caused by chronic iliocaval venous occlusion: non-invasive quantitative assessment

Patients with chronic inferior vena cava (IVC) and bilateral iliac vein postthrombotic occlusion often report subjective decreased exercise tolerance that improves after stent reconstruction. We report preliminary results of the use of quantitative exercise testing to assess change in exercise tolerance occurring after venous reconstruction. The Institutional Review Board approved this retrospective study. Exercise testing before and after intervention was conducted in the Human Performance Laboratory (HPL): resting blood pressure, heart rate, body mass index (BMI), body composition, standard pulmonary function tests, and incremental maximal exercise testing (VO2 max test). Maximal exercise was defined as a plateau in the oxygen uptake, a respiratory exchange ratio (RER) greater than 1.1, or voluntarily termination of exercise. The VO2 max (mL/kg/min), maximum work (W) and total exercise time were analyzed. Percutaneous venous reconstruction was performed using standard techniques and stents. Results were reported as simple averages and percentages. Three male patients with chronic postthrombotic IVC and bilateral iliac venous occlusions were studied. Mean age 63 ± 8 years, mean duration of occlusion 36 ± 12 months. The interval between reconstruction and testing ranged from 2.5 to 11 months. All patients had stents in the infra-renal IVC to bilateral common femoral veins. No exercise instructions were provided to patients after stent reconstruction. Following venous reconstruction, the V02 max increased an average of 38.7%, the total work increased 74.4%, and the total exercise time increased 18.7%. Each individual lost weight, with an average decrease of 7.5%. Subjectively, all patients reported an increased exercise tolerance and decreased shortness of breath with exertion. Subjective impairment in exercise tolerance and improvement after venous reconstruction was quantitated in three patients with chronic postthrombotic occlusion of the IVC and bilateral iliac veins. HPL testing may be a useful additional objective tool in the study of patients with chronic ilio-caval occlusions.

Рабочие режимы и ресурсные показатели дизелей 9L28/32А-F фирмы MAN-B&amp;W в процессе длительной эксплуатации

The article describes L28/32 and L23\30 MAN-B&amp;W diesel engines widely used by many shipping companies owing to high maintenance and service ability of simple, but sufficiently reliable engine parts. As for a medium speed 4-stroke engine, diesels have optimal power forcing characteristics, high fuel saving and durable overhaul time for essential parts. There have been considered the positive and negative features of the engine, which are also important technical indicators, in comparison with the designed samples when choosing the base engine. The analysis of operational durability, the typical failures of the cylinder-piston group and other essential parts &#x0D; of 9L28/32A-F MAN B&amp;W engines under different operation modes and loads have been given. During the first overhaul there has been demonstrated the working state of the cylinder-piston group of two engines after 22424 and 22672 h instead of recommended 12000 h for heavy fuel oil. Owing to diagnostic control and monitoring cylinder liner and piston rings assembly, overhauling was made only by condition mode. Maximum working time (40084 h) without cylinder overhaul was reached at suspend power of 75% Pe nom. At a tanker «Georgiy Froier» during 12 years of operation and 64500 working hours only 15pistons were overhauled instead of 48recommended, with changing 39 piston rings instead 194 recommended. In the future, the engines worked up to &#x0D; 100 thousand hours without top overhaul, with high resource parameters of the main parts on two engines in the shipping company. The operational problems of the engines with isobaric boost system on ships with a fixed-pitch propeller were identified and considered.