Determining reliability functions of steam turbine in power plant 'Nikola Tesla, block a4'

Determination of reliability indicators of steam turbine system in the thermal power plant 'Nikola Tesla, Block A4'during useful life period is based on a ten-year operational database. By implementation of mathematical theory of reliability to exploitation research data and using simple and complex two-parameter Weibull distribution, the theoretical reliability functions of the considered system are determined. The graphical method is applied to quantitatively determine reliability indicators. Obtained probabilistic laws of failure density and failure rate, according to which the random variable behaves, do not coincide completely with empirical distributions, regardless of whether the theoretical functions are obtained by simple or complex Weibull distribution

Determining reliability functions of steam turbine in power plant 'Nikola Tesla, block a4'

Determination of reliability indicators of steam turbine system in the thermal power plant 'Nikola Tesla, Block A4'during useful life period is based on a ten-year operational database. By implementation of mathematical theory of reliability to exploitation research data and using simple and complex two-parameter Weibull distribution, the theoretical reliability functions of the considered system are determined. The graphical method is applied to quantitatively determine reliability indicators. Obtained probabilistic laws of failure density and failure rate, according to which the random variable behaves, do not coincide completely with empirical distributions, regardless of whether the theoretical functions are obtained by simple or complex Weibull distribution

Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe

Risk assessment procedure based on structural integrity evaluation has been applied to oil drilling rig pipe. The new concept based on application of structural integrity evaluation to assess risk level according to probability and consequence of failure was used. Analytical expressions for surface cracks are used to calculate stress intensity factors for different crack geometries. Oil drilling rig welded pipe integrity has been evaluated analytically by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, KI, and its critical value, KIc, in relation with the ratio of applied stress and its critical value, to define the point in FAD. Probability of failure is then taken according to the position of the point in the FAD, corresponding to oil drilling rig welded pipe data. The same logic is employed in the case of cyclic loading, i.e. fatigue crack growth. In that case, structural life is estimated by using Paris law to calculate crack length vs. number of cycles, to be used in risk assessment procedure and by managers to make decision about further use of damaged pipes, based on data provided by engineers

Risk assessment based on analytical evaluation of structural integrity and life of drilling rig pipe

Risk assessment procedure based on structural integrity evaluation has been applied to oil drilling rig pipe. The new concept based on application of structural integrity evaluation to assess risk level according to probability and consequence of failure was used. Analytical expressions for surface cracks are used to calculate stress intensity factors for different crack geometries. Oil drilling rig welded pipe integrity has been evaluated analytically by simple application of the Failure Assessment Diagramme (FAD), i.e. by using the ratio of linear elastic fracture mechanics parameter, KI, and its critical value, KIc, in relation with the ratio of applied stress and its critical value, to define the point in FAD. Probability of failure is then taken according to the position of the point in the FAD, corresponding to oil drilling rig welded pipe data. The same logic is employed in the case of cyclic loading, i.e. fatigue crack growth. In that case, structural life is estimated by using Paris law to calculate crack length vs. number of cycles, to be used in risk assessment procedure and by managers to make decision about further use of damaged pipes, based on data provided by engineers

Crack resistance of aluminium alloy friction stir welded joint

Charpy testing is conducted on a high-speed data acquisition instrument, using instrumented pendulum to separate energies for crack initiation and propagation. The J-R curves are used to determine JIc, as the measure of fracture toughness. The Taguchi method with a special design of orthogonal matrices to reduce the number of experiments to a reasonable level has been applied

Crack resistance of aluminium alloy friction stir welded joint

Charpy testing is conducted on a high-speed data acquisition instrument, using instrumented pendulum to separate energies for crack initiation and propagation. The J-R curves are used to determine JIc, as the measure of fracture toughness. The Taguchi method with a special design of orthogonal matrices to reduce the number of experiments to a reasonable level has been applied

Risk Management of a Hydro Power Plant - Fracture Mechanics Approach

Risk management of a hydro power plant has been analysed from fracture mechanics point of view. The research is focused on the risk and integrity assessment of pressure equipment in a reversible hydro power plant in order to determine to what extent it poses a risk to Bajina Basta settlement and its inhabitants. The risk matrix has been used to assess risk level according to probability and consequence in a more descriptive way, whereas the failure assessment diagram has been used as an alternative engineering approach, including level II analysis

Lasing on the D_2 line of sodium in helium atmosphere due to optical pumping on the D_1 line (up-conversion)

A new method is proposed to produce population inversion on transitions involving the ground state of atoms. The method is realized experimentally with sodium atoms. Lasing at the frequency corresponding to the sodium D_2 line is achieved in the presence of pump radiation resonant to the D_1 line with helium as a buffer gas.Comment: 4 pages, 4 figures, Late

Challenges of future research in the area of industrial safety

In today's turbulent business conditions, characterised by rapid technological development of a 'post industrial' society, in which new technologies result in new risks, safety management of complex techno-socio-ecological systems becomes imperative for sustainability and survival. This paper points out the problems related to future research in this area through a review of technological discoveries, and also waves of considerable technological, sociological and ecological disasters

Challenges of future research in the area of industrial safety

In today's turbulent business conditions, characterised by rapid technological development of a 'post industrial' society, in which new technologies result in new risks, safety management of complex techno-socio-ecological systems becomes imperative for sustainability and survival. This paper points out the problems related to future research in this area through a review of technological discoveries, and also waves of considerable technological, sociological and ecological disasters