Thermo-Mechanical Analysis of Compression Sleeves

Abstract In recent years, metallic compression sleeves have gained prominence due to their role in enhancing the integrity of pipeline systems. These sleeves can potentially extend the operational life of pipelines by mitigating crack propagation and strengthening material properties. They offer an economically viable repair method, reducing operational disruptions and risks associated with installation, especially under challenging operating conditions. While preliminary studies have been promising, a more detailed understanding of stress dynamics during both the installation process and subsequent operation of the sleeves is needed. This research aims to conduct thermo-mechanical evaluations of Type-A compression sleeves, which are notable for their absence of end fillet welds. We utilize finite element (FE) analysis with the intention of providing insight into the reliability assessment of these systems. The current study employs a coupled field transient system, accommodating the simultaneous application of mechanical variables, such as internal pressure, and thermal factors due to sleeve preheating and welding. This approach mirrors the steps of sleeve installation, from changes in operating pressure and induction heating to welding and cooling. Moreover, the study examines the performance of compression sleeves through a sensitivity anlaysis of significant parameters including internal pressure, mechanical properties of epoxy resin, tolerance fit, and contact between pipe, epoxy resin, and compression sleeve. This study holds significant promise in guiding the compression sleeve application procedures, structural design, and material choices, culminating in enhanced structural robustness and dependability of pipe systems.