Loading...

Repairing of Damaged Metallic Pressure Pipe Using Polymer-Based Composites

Kaveh Pisheh, Mahsa | 2021

534 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54695 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. Due to well mechanical properties and high resistance to environmental conditions, metal pipes are used to transport oil and gas products, water and sewage, as well as hydraulic systems in aircraft or aerospace systems. Therefore, maintenance of oil and gas transmission lines in energy-related industries and pressurized tanks in the aviation industry has always been a concern of engineers. Due to the problems of old methods for repairing damaged pipelines or aerial structures, it seems necessary to provide new, safe and cheap methods for repairing them. Various engineering standards for pipelines and their repairs have been presented so far which have analytical solutions to determine the minimum thickness of the composite required for the safe repair of damaged steel pipes, However, due to the effect of composite layup on their strength, previous studies have selected or designed suitable composite laminates for repair by considering different conditions and damages of the pipe, such as operating pressure, pipe dimensions, geometry and type of damage. Among the types of pipeline damages, gouges and dents are the most common, which usually occur simultaneously, But in previous research they have received less attention. In this research, a relatively new method for repairing corrosion steel pipelines using composite materials is presented. In this study, considering these damages, composite laminates have been designed and optimized to repair various dimensions of pipes and damage. To do this, the stress analysis of the damaged pipes and composite laminates has obtained using ABAQUS software, and 14 layer-carbon fiber composite with the layup [± 54] degrees to the pipe axis for pipe repairing has been chosen. DOE Method is also used to statistically design the experiment observation. Following, using MINITAB software, the effect of each parameter on the response is investigated and concluded the most important factors in Von Mises stress of pipe are outer diameter and operating pressure and in the Sai Wu failure criterion is the type of composite. Finally, after developing a software for designing and optimizing composite repairing with the help of MATLAB software and based on genetic algorithm, by optimizing multi-objective functions and creating the desired design point, the damage repair system was optimized and 8-layer carbon composite weaker than the initial repair system, with layup [55, -80, -25, -5,90, -65,65,25] selected. The software developed from this research has the ability of designing and optimizing automatically the composite laminate for different dimensions of the pipe and dent and gouge damage and can also be upgraded to the required level
  9. Keywords:
  10. Optimization ; Composite ; Genetic Algorithm ; Design of Experiments Method(DOE) ; Metal Tubings ; Pipe Repairing ; Repairing ; Composite Layup

 Digital Object List

 Bookmark