Papers by Keyword: Safety

Abstract: The main objects of the EES, the service life of which exceeded the standard value, are increasingly beginning to determine the efficiency of work every year. This manifested in an increase in the number of automatic emergency shutdowns, the number and complexity of emergency-hazardous defects. Organization of operation, maintenance and repair of these facilities recommended carried out according to their technical condition. And since the technical condition determines the reliability and safety of the object, it is therefore recommended to take these properties into account more fully. These recommendations in the EES carried out at a high quality level, intuitively, according to operating experience.In this article, as distributed objects of continuous operation, overhead power transmission lines (OPTL) with a voltage of 110 kV and higher, the service life of which exceeds the standard value, are considered. The issues of quantifying the degree of significance of the aging problem for a set OPTL, their classification and methodology for assessing the difference in the degree of aging when classifying them according to given types of characteristics are considered. The methodology and algorithm of methodological support for the management of the EES and network enterprises during the organization of operation, maintenance and repair, been developed.

Abstract: The growing interest towards hydrogen technologies and their implementation in the hydrocarbon and chemical process industry makes maintenance planning of storage and transport equipment an emerging safety aspect. With respect to high-pressure working equipment, Risk-Based Inspection methodology (RBI) aims at minimizing the risk of loss of containment due to materials’ deterioration mechanisms. This set of procedures focuses on the mechanical integrity of equipment to achieve crucial risk mitigation by means of risk-informed inspection planning and maintenance activities. In addition, hydrogen-induced damages are often generalized or even neglected by the existing RBI standards and recommended practices. On this basis, high-pressure vessels, process piping and storage tanks working in gaseous or liquid hydrogen environments, which are exposed to hydrogen-induced deterioration mechanisms, might be subjected to an inaccurate evaluation of the associated risk and hazards when these RBI standards are applied. For this reason, this work proposes a review of the pipelines steels commonly used for gaseous hydrogen transport to investigate the possible limitations of the standard RBI planning methodologies, when applied to hydrogen technologies. More accurately, the pipeline steels’ susceptibility to hydrogen-induced degradations mechanisms will be discussed to underline assumptions and hypothesis limiting the conventional RBI applicability. Therefore, the overall suitability of standard RBI planning with respect to hydrogen equipment is discussed, highlighting possible relevant gaps as a general result.

Abstract: A large vessel, such as a container ship or an oil tanker, requires painting processes that include not only application, but also cleaning, substrate preparation and corrosion treatment. Moreover, these processes take place during construction (both in the construction of blocks in the workshop and in the assembly at the dock) and also during the operation phase of its life cycle, as part of its maintenance. This research analyzes the advantages of the implementation of key enabling technologies in painting processes versus the proposal of preventive measures, collective and individual protection, and training of workers in traditional manual processes. Using the Fine-Kinney method, which assesses potential hazards and associated risks, the degree of danger of the different tasks present in the current painting processes of large vessels is measured. These risk scores is compared with those of the new activities resulting from the simulation and automation of the associated processes, analyzing their justification by confronting their level of correctness (risk mitigation) with the cost factors of their implementation. The results show that, from a health and safety point of view, the proposal of these measures is fully justified. Therefore, it can be concluded that the inclusion of key enabling technologies in the painting processes of a ship throughout its life cycle drastically reduces risk levels, improving the safety and health conditions of the workers involved, without prejudice to an increase in the cost of services or in the delivery deadlines to the client, which confirms their reliability.

Abstract: In recent years, in connection with numerous incidents of fires occurring in hotels, many studies have been conducted on risk management issues, as well as actions in emergencies. Research has often been limited to incident analysis rather than addressing how to manage fire safety to minimize risks and did not sufficiently take into account the features of the construction of the hotel building and the characteristics of materials. The existing state of management and regulation of material damage risks from fires and emergencies does not fully take into account the approaches and means for their minimization, in particular in hotels. There is an increasing need for the use of assessment methods that will help in the performance of risk management functions. There is a need to find effective mechanisms for assessing the risks of material damage of building construction and materials of high-rise rooms from fires and emergencies. Fires in public sites on the example of hotels have been taken for research. There is an increasing need for the use of assessment methods that will help in the performance of material loss risk management functions. During the period of martial law, the method of assessing material damage to the building presented in the article can be used to assess material damage from destruction and fires for future compensation. With the help of this method, it is possible to estimate probable material damage from fires and emergencies, which will allow them to be used in supervisory and preventive activities and the insurance industry. Thus, fires in hotels cause significant material damage, and recently, as statistics show, also human losses. In hotels, it is important to ensure the protection of the building, premises and people from fire. Therefore, the issue of assessing fire risks is currently relevant. Fire risk assessment is an important part of fire science and safety engineering.

Abstract: Water supply and disposal systems make an important part of the social vital activities. The operation features, reliability and longevity of water supply and disposal components made of concrete, mostly depend on the quality of concrete fillers taking up to 80% of the concrete volume and significantly affecting its properties. At the plants or construction sites the negative impact of such fillers is compensated by the increase in cement gaging which is not desirable. That is why, for the sake of cement stretch-out the authors suggest adding a dusty component to the conventional components of concrete mix. Along with improving the prefabricated unit quality and savings in the construction, the use of ash and expanded clay dust increases the utilization of this industrial waste, reduces the cost of maintaining ash and expanded clay dumps, and contributes to the protection of the environment from pollution.

Abstract: Construction industry is one of the oldest industries in the world. It is the most manpower dependent industry in mankind civilization till now, very risky industry, and very slowly changing compared to other industries like IT hardware or car manufacturing for which a huge development took place to reduce, or may be eliminate, dependency on manpower.

Abstract: Active elements are objectively existing necessary structural components, which largely determine the physical and technical properties of the material and the functional stability of the structure in operational conditions. To manifestation the creative (structure-forming) role of the active elements of the structure, it is necessary to ensure that their initial distribution at various levels of structural heterogeneities is capable of initiating metastable elements and ensuring structural changes of the system without losing its functional purpose.

Abstract: The main goal of the work is to identify the advantages of fast reactors when using nanotechnology in the manufacture of core materials. The research methods are based on the adaptation of known technologies (including powder metallurgy) to the design of fast reactors and on the numerical simulation of physical processes carried out using computer programs for the analysis of emergency conditions of fast reactors (including anticipated transient without scram - ATWS). The results of the research show that the use of structural materials based on steels hardened by nanooxides in combination with fundamentally new types of fuel based on composite materials can significantly improve the safety of nuclear technics. Sintered mixtures of ceramic microgranules (oxide, nitride) and nanoadditives of metallic beryllium or uranium are considered as nuclear fuel. Such composite nuclear fuel improves reactor safety and power. The following types of composite fuel were analyzed: mixed oxide with additives of a beryllium or uranium nanopowder, mixed mononitride with additives of a beryllium or uranium nanopowder. Most preferably, a ceramic-metal pellet fuel based on mononitride microgranules and uranium metal nanopowder. The use of such fuel (with a volume fraction of metallic uranium up to 20%) significantly increases the safety of the reactor, combining the advantages of metal and ceramics and completely neutralizing their disadvantages. The proposed materials are of practical importance in the development of new concepts of nuclear technics, in the transition to large-scale nuclear power and high-power reactors. The use of a new cermet-based composite fuel increases the power of the reactor and significantly increases the safety of the reactor.

Abstract: The use of Substation Communication Networks (SCN) in power distribution centres of thermal power plants for protection, control and monitoring is increasing as industry’s confidence grows in the application of the IEC-61850 based Substation Automation Systems (SAS). IEC-61508, which is the standard for functional safety, addresses Electrical/Electronic/Programmable Electronic (E/E/PE) safety based technologies in so far as safety lifecycle as well as reliability and verification of safety related systems are concerned. It follows therefore, that Substation Communication Networks (SCN), as well as associated substation equipment that forms part of the overall safety system should satisfy the requirements of functional safety standard IEC-61508. In this paper, Substation Automation System standard (SAS) IEC-61850, Substation Communication Networks (SCNs) as well as dependability evaluation methods are reviewed and discussed.

Abstract: This article is devoted to the description of methods for improving the efficiency and production of autoclaved materials and lime, as well as an increase in safety in their production. The basis of the proposed technical and technological methods is a new method for the production of autoclaved materials. As part of the scientific work on improving the quality of autoclaved products, an additive (copper sulphate) was found, which makes it possible to slow down the lime hydration time in the binder for several hours, which makes it possible to apply the mechanical activation of lime-silica binder with wet grinding and improve working conditions in the workplace.