Papers by Keyword: Risk Assessment

Abstract: The paper deals with risk analysis of insufficient airtightness of the envelope construction. The risk analysis is a systematic and structured data processing to identify potential hazards. The main aim of paper is to qualified risks which arise from the danger, i.e. insufficiently airtight of the building envelope. The quality of airtight building envelope except for low energy consumption also minimizes the risk of damage to the structure associated with the spread of the heat, water vapor in the structure and fungal growth. The qualification of risks consists of choice of method and determinative indicators, input data and simulation of model with drawing results.

Abstract: The Railway transport system is experimenting a deep transformation nowadays. The continuous technological evolution and the raising the standard of living of the population have led today to an increase in the volume of rail traffic, both referred to the passenger and freight transport. Despite railways being a statistically safe form of transportation (due to guidance per rails, professional drivers, etc.) rail accidents may still happen. Safety in railway infrastructure must be understood as the safe performance of their functions by the main components. From this perspective it denotes a growing interest in the issue of safety in railway tunnels. In particular, the analysis of the structural aspects of reliability and maintenance goes to correlate safety analysis. The papers aims to ensure a proper level of safety in railway tunnels, through the adoption of measures of prevention and protection finalized at the reduction of critical situations. In the present study a rigorous methodological approach is proposed for a “typical” Italian railway tunnel.

Abstract: With the gradual expansion of China's electrical network construction, network scale and transmission capacity, a reasonable electrical network construction scale research is urgent for the optimized power system development. In this paper, a blackout risk assessment index system as well as the risk calculation model under different electrical network scales is established, followed by a series of blackout risk value calculation of constitutive units in an IEEE-14 node standard system under typical patterns, hence the validity of the model is verified via comparison with the actual blackout risk value of the system. The result indicates that that the ranking of blackout risk values under different connection patterns with the same amount of lines is polygon, quadrilateral and triangle.

Abstract: Every manufacturer requires plant maintenance. Knowing that an effective maintenance system increases sales and decreases maintenance cost of the production facility, maintenance is deemed to be substantial contributions to improved plant profit changing from a necessary evil to a profit centre. Unfortunately, this sometime is a far cry from reality. This paper offers a concept of incorporating risk into maintenance and development of a Decision Support System (DSS) for decision makers in the maintenance department. It helps prioritise critical equipment and select its associated maintenance strategy for optimum results. The results of validating the devised AHP-based software package in a case study company in Indonesia are promising since the company successfully gains 3.65% in Net Line Efficiency and 3.13% in Gross Line Efficiency as well as enjoys an advantage over 4.56 points decrease in Operation Performance Loss.

Abstract: This study was carried out to assess risk assessment of Third-party damage index for a gas transmission pipeline around a suburb in Benin City, Edo State, Nigeria. A full length walk survey was carried out for the 12 km gas transmission pipeline of the Nigeria Gas Company that transcends Uteko community via Benin Auchi road through Osina town and some part of Benin Agbor road, all in Edo State of Nigeria. The 12 km pipeline facility surveyed was sectioned into a total of 60 test points (labelled P1 to P60), each test point measuring up to 200 m. The surveyors examined the third party index variable score for each of Minimum Depth of Cover, Activity Level, Aboveground Facilities, Line Locating, Public Education, Right-of-way Condition, and Patrol Frequency third-party variables. An overall third-party index score of 29.87% was obtained. This means that the surveyed 12 km pipeline is highly susceptible to failure due to third-party activities. This was perceived to be the consequence of the high level of insensitivity to, and lack of proper control of the third party activities taking place in the facility location. The study suggested measures to be employed in order to mitigate possible damages to the pipeline occasioned by third party activities, thereby bringing to the fore, the current drive to ensure pipeline safety and integrity.

Abstract: This study is aimed at four typical oil production plant station of Daqing oilfield of China petroleum (union station, transfer station, production wells and injection wells) ,where the surrounding shallow soil environmental background (pollution) status.Collecting the information nearby the typical stations within the scope of evaluation of geological and hydrogeological information and the surrounding soil environment information of the sensitive area.Building a conceptual model of the site.According to the characteristics of pollutants,pollution,the site conditions and environmental sensitivity,select and optimize the economic and applicable remediation of petroleum pollution inferring to the different situations of soil.

Abstract: Risk assessment of complex rotating equipment is costly and time consuming process. Due to the reason, only critical equipment should be considered for detailed risk assessment. In this study, a semi-quantitative risk assessment model was developed to assess the risk of rotating equipment. The model consists of four main parts, initial risk screening, risk assessment, Failure Mode and Effect Analysis (FMEA) and maintenance strategy planning based on reliability concept. The model was used to assess risk of rotating equipment of power generation unit. Initial risk screening indicated compressor, combustion chamber, turbine and lube oil system of the power generation system as critical equipment under serious risks. Risk assessment using Borda ranking minimized the risk ties and showed compressor, combustion chamber and turbine were more critical as compared to lube oil system. Failure modes were identified using FMEA, 68% of the downtime was due to compressor, combustion chamber and turbine failure modes. Only 32% of the downtime was due to lube oil subsystems failure modes. Maintenance interval for compressor, combustion chamber and turbine was calculated 2 months and 5 months for lube oil system to reduce risk.

Abstract: With the development of our economy, highway becoming more and more important for our lives. While the construction of the highway will cause many geo-hazards such as landslide, Collapse, Debris Flow and loess collapse etc. , based on the highway of S208, the types and character were analyzed in The paper, then their hazards were evaluated, it can be supplied a necessary basement for letter prediction and evaluation and comprehensive zoning evaluation.

Abstract: Characteristics of the subway project is complex, concealed, lot of potential risks. Aiming these features, in order to reduce the risk of the project and improve the rationality and accuracy of subway risk assessment, the main risk factors in the subway are analyzed and identified by methods of expert investigation and checklists, and the risk index system is established, based on research of the subway construction risk mechanism. Then the membership of each evaluation factor is determined by the expert experience method, and the weight of each risk factor is determined through the method of analytic hierarchy process (AHP). Eventually, the subway engineering risk assessment model is established based on the fuzzy comprehensive evaluation method. Finally, the project example verifies the rationality of the risk assessment model.

Abstract: Asbestos collectively refers to a set of naturally existing silicate minerals with fibrous structures, and is a natural mineral in fibrous forms that was originally serpentines or amphiboles. Because of its properties such as resistance to heat, chemical resistance and corrosion; tensile strength; sound absorption; and affordable prices, it had been widely used as building materials, fire resistant and retardant, thermal and heat insulation, sound absorbent, and electrical insulation. Since the prolonged inhalation of asbestos can cause serious illnesses such as lung cancer, mesothelioma, and asbestosis after an incubation period of 20 to 40 years, the mineral was classified as Group 1 carcinogen by the International Agency for Research on Cancer. In Korea, asbestos-containing construction materials had been widely used until asbestos was added to the hazardous substance requiring permission for use by the Occupational Safety and Health Act, and use of asbestos was totally banned in February 2009. This survey was conducted with 45 buildings to assess asbestos-containing materials used by usage of building. It was found that asbestos-containing construction materials were used in 27 buildings out of 45 buildings surveyed.