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ABSTRACT
Natural gas forms a major fuel source for power generation in Nigeria. It fuels 86% of electricity generated for the national grid, while the remaining 14% is generated by hydro-power plants. The process to get natural gas from the well to the power station requires multiple facilities working together, which are all regulated by the Nigerian Gas Company (NGC). Due to age, technological obsolesce and increase in electricity requirement, these facilities are currently being upgraded and rehabilitated, to account for both increased requirements and degradation. These rehabilitation and upgrade presents technical and design difficulties due to newly added load cases. This could be remedied by performing piping stress and flexibility analysis on the upgraded piping system to determine the newly induced stress factor on the system The piping stress analysis for the pressure reduction skid lines of the upgraded Delta IV Metering Station gave satisfactory stress results with a factor of safety of 6.7 for main lines section, while the cold vent lines section gave less satisfactory result with a factor of safety of 1.02 and a high expansion load, indicating large displacements. High sustained load was also observed in the main lines section, with highest stresses being the hoop and axial stresses due to the presence of large deadweight
