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Repair and Connection of Steel Pipes under Internal Pressure using FRP

Safarizadeh, Erfan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56962 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Toufigh, Vahab
  7. Abstract:
  8. The repair of pipes that deteriorate over time or due to various factors is a critical issue in engineering. Consequently, effective and novel repair methods, especially using FRP (Fiber-Reinforced Polymer) composites, have gained significant importance. In this research, the repair and connection of pipes using FRP are examined. In the pipe repair section, through hydrostatic testing, various factors such as the damaged area, the number of sharp corner points, the width of the sheets, the number of layers, and the pre- stress condition of the FRP are studied for their impact on the pipe's ultimate pressure tolerance. Also, in the pipe connection section, with hydrostatic tests, the ultimate pressure on two samples with different FRP widths is investigated. During the tests, metal pipes were subjected to fluid pressure, and their resilience against various pressures was evaluated. In the pipe repair section, results demonstrated that as the damaged area increases, the pipe's resistance can decrease up to 20 Bar. Wider sheets cover a larger area of the pipe, possessing a higher pressure-bearing capacity. Moreover, pre- stress sheets, having better adhesion to the pipe, offer 69% more resistance than sheets without pre- stress. In the pipe connection section using FRP, hydrostatic tests on two samples with different FRP widths showed that the sample with a wider width can withstand about 42% higher pressure. This indicates the potential to enhance connection strength using FRP. These valuable findings provide new insights into pipe repair using FRP composites and can be utilized to improve and optimize repair methods
  9. Keywords:
  10. Repairing ; Pipe Fitting ; Hydrostatic Pressure ; Resin ; Fiber Reinforced Polymer (FRP) ; Glass Fibers ; Metal Tubings

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