During gas turbine operation, the vibration that occurs at high speed, hot gases entering the combustion chamber and other operational factors affect the longevity of gas turbine blade. This paper is focused on the selection of suitable materials that can withstand the severe working condition and thermo-structural analysis using Finite Element method (FEM) to determine the behaviour of each material under service condition. Cambridge Engineering Software (CES) was employed in the material selection process where GTD111, U500 and IN 738 were identified prior to analyzing U500 and IN 738 due to desired mechanical properties over GTD111. Employing ANSYS R15.0 in the steady state thermal analysis, maximum service temperature of 736.49 o C and maximum Total heat flux of 4.345x10 5 W/m 2 was obtained for IN 738 material while maximum service temperature of 728.29 o C and maximum Total heat flux of 4.1746x10 5 W/m 2 was obtained for U500 blade material. For structural static analysis, maximum von-mises stress of 454 MPa and total deformation of 0.16221 obtained for IN 738 while maximum von-mises stress of 416 MPa and total deformation of 0.12125 was obtained for U500 blade material. While the FEA analytical results for both materials exhibited less variations between each other, IN 738 displayed better thermal characteristics, whereas, U500 presented satisfactory structural static results and above all, von-mises stresses obtained for both materials was below their yield strength and melting temperature. Hence, gas turbine blade materials should be assessed thoroughly for structural and thermal conditions before manufacturing.

Gas transmission pipelines mainly transport flammable fluids across the length and breadth of the country especially in the Niger Delta region of Nigeria. The associated risk to both the individuals’ encroaching and inhabiting areas along the right-of-way (ROW) and the society at large cannot be underestimated. Thus safety concerns considering the individual and societal risk of pipeline failures has become important. This paper attempts to develop a model for both individual and societal risk assessment for a 12km length natural gas transmission pipeline in Utekon community (commencing from the Benin-Auchi through Uhuwmunode Osina town and terminating in the Benin-Agbor axis) in Edo State using the Chemical Process Quantitative Risk Analysis Method (CPQRA). The CPQRA is used because it examines the hazard zones within a pipeline ROW and the number of persons that would be affected by fire/explosion. Finally, field data was used in this study to validate the model which can be applied to any natural gas pipeline risk assessment scenario.

The design engineer is daily confronted with the need for materials to meet design requirements of strength, stiffness, toughness, wear-resistance, corrosion-resistance, high-temperature operation and so on. Steel is the most versatile material and can be made into various forms, types or grades and possesses diverse mechanical properties that made it suitable for different uses. Through the study of the metallurgy of steel, steels are standardized into groups according to their composition, characteristics and uses derived from the types, sizes and dispersion of micro-constituents. The knowledge of the various standards and their equivalence relationships are the tools for choice of steel for design and for the development of new grades of steel.

The purpose of this paper is to design a 10 million litre capacity petroleum storage tank for use in the oil industry in Nigeria with a view to overcoming the challenges associated with the loss of product due to evaporation. The tank having diameter and height of 27.4m and 17.5m respectively was designed to have two relief valves; a primary valve which would ensure that the product vapour pressure within high-level (h2) in meters of the storage tank does not exceed the minimum acceptable pressure. The second relief valve is designed to relief due to a sudden increase in pressure as a result of a possible fire in the tank. To this end, the design made reference to the American Petroleum Institute Manual 650 (12th Edition) as a guide. Some fundamental considerations include tank shape, height, diameter and materials used. A corrosion allowance of 3mm was also considered.

This paper involves the use of Rayleigh-Ritz finite element method to determine the temperature distribution in a nuclear fuel element consisting of a sphere of fissionable material and a spherical shell of aluminum cladding. The differential equation is a one -dimensional second order differential problem. The finite solutions obtained when compared with the exact solutions shows that the accuracy increases as the number of elements increases with decrease in error, and this was shown graphically. It can be stated that finite element method is an accurate method for determining the temperature distribution in a nuclear fuel element consisting of a sphere of fissionable material and a spherical shell of aluminum cladding.