Pipelines have a major role in transporting fluids for utilities (water) and energy (gas) infrastructure all across the world. The age of these pipelines and their rapid deterioration, causes incidents to occur on a daily basis throughout various pipeline networks resulting in financial burden and a negative impact on the community, environment and economy. Repairing and rehabilitating these vulnerable assets is of utmost importance. Pipe-in-pipe (PIP) repair systems are a promising technique in reparation and rehabilitation of in-service pipelines. There is concern in regards to the performance of PIP systems in the long-term, leading to investigation of PIP systems against varying failure modes. This research aims to investigate the axial deformation due to thermal expansion and contraction of different PIP materials, with the aim of numerically and analytically evaluating their structural performance and determining the thermal stress and loads effects on the axial deformations. Finite element analysis and analytical approaches will be implemented to achieve the research aims that will significantly reduce the time and cost of experiments and assist to derive new analytical approaches that accommodate most design parameters. This research will benefit the industry, giving designers confidence in providing safe and efficient PIP repair systems.
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