Estudo do comportamento mecânico do reparo com chapa colada em tubulações com dano para diferentes tratamentos superficiais

Abstract

This work developed new methodologies of repair of steel pipes that can be used in emergency situations to stop leaks with potential to cause accidents, operating and even stop environmental impacts. This new repair consist of bonding engineering steel plates with surface treated and adhesion promoter applied over holes defects in steel pipes using an epoxy adhesive, that the process and adhesive were developed by Laboratório de Adesão e Aderência (LAA) / UERJ. The pipes have received 3 kinds of surface treatments: Blasting, sanding and MBX tool (Bristle-Blaster). The roughness of the surface treatments and repairs performance were evaluated. The blasting has generated the greatest roughness profile, and the treatment with MBX tool (Bristle-Blaster) has generated greater roughness profile than sanding. The performance was evaluated by two types of hydrostatic tests, the rupture tests and creeping tests. The Rupture tests occurred by pressurizing the pipes repaired with 23,5°C with water until the repairs leaks, the repairs withstood pressures greater than 144bar. The creeping tests occurred by pressurizing the pipes repaired with 40bar average pressure with water at 60°C and keep this condition until the repairs leaks, the repairs withstood these terms of creeping by at least 52 hours and until 1073 hours.