Optimal design of the geometrical parameters of biocomposite wraps using in repairing of corroded pipeline under internal pressure: application for Algerian MEDGAZ

In accordance with the Design of Experiment (DOE), Multiple Nonlinear Regression Analysis (MNRA), and Stochastic Search approaches, the objective of this contribution is to optimize the geometric parameters of a multi-layer natural fiber-based composite wrap used for the repair of corroded pipelines, with the aim of replacing the conventional synthetic solution. The performance of the proposed natural fiber solution is examined by evaluating the Von Mises stresses (VMS), considering three geometric parameters of the composite wrap and their interactions: Length (Lp), Number of Plies (NPp), and Recovery Angle (RAp). To achieve this, 27 configurations were tested for each type of material. Two alternatives are used in the modeling part: Response Surface Methodology (RSM) and MNRA. The VMS responses, as predicted by MODDE and the Differential Evolution algorithm, are influenced by the geometric parameters and their interactions. Optimal reinforcements for the corroded zone volume of the pipe are proposed for each composite wrap. The results obtained show that in order to achieve the performance of a synthetic composite patch, the volume of the Jute/Epoxy and Palm/Epoxy patch biocomposites must be approximately 2.5 and 2.0 of the volume of the Glass/Epoxy, respectively.