In designing a horizontal directional drilling (HDD) pipeline project, designers\nface the challenge of determining the regions of maximum and minimum stresses\non pipelines, ensuring the stability of the bore-hole from collapse and minimizing\nthe stresses induced on the pipeline due to the bore-profile. This study analyses\nthe stress induced on an HDD pipeline system using the ANSYS Version\n18, mechanical APDL finite element (FE) software. The pipeline used as the case\nstudy was a gas transmission pipeline installed in south-west Nigeria. A macro-\nfile for ANSYS Version 18, mechanical APDL used to model the pipeline\nwas developed. The results showed that the maximum and minimum stresses\ninduced on the HDD pipeline were at the top and bottom of the pipe, respectively;\nwhile the stresses on the sides were uniform (Approximately equal to 888 kg/cm2) all through the\npipeline, irrespective of element number. The maximum stress occurred at the\ncurvature point with the highest entry angle (10 Angstrom), resulting in a maximum deflection\nat this point. The model stress validation performed by comparing results\nwith theoretical solutions, both with respect to radius of curvature and internal\npressure, showed percentage difference (errors) less than 10%. The cross sectional\narea validation showed a percentage difference of 0.059%.
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